{"title":"Fuses","description":"\u003cp\u003eAlmost all of our fuses are miniature cartridge fuses for appliances and electronics. We stock them in 5 x 20mm and 6 x 32mm sizes, as quick-blow and slow-blow types. We also stock a few plug fuses for UK plugs. Whichever you need, the right replacement matches the old fuse in size, amp rating and speed, as we explain below.\u003c\/p\u003e","products":[{"product_id":"13a-fuse-bs-1362-certified-10-pack","title":"13A Fuse BS 1362 Certified - 10 Pack","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge 13A cartridge fuse is a BS 1362 certified replacement fuse for UK 3-pin plugs, adaptors and fused connection units. Each fuse measures 6.35mm diameter by 25.4mm length and is rated to carry 13A continuous load at 240V 50Hz, providing overcurrent and short-circuit protection for electrical appliances up to 3,120W.\u003c\/p\u003e\n\u003cp\u003eUsed in standard UK plugs for appliances including kettles, toasters, washing machines, televisions, computers and kitchen equipment, the fuse acts as the weakest point in the circuit by design. When current exceeds 13A — either through a fault in the appliance or a short-circuit in the cable — the fuse element melts and breaks the circuit before damage reaches the appliance or wiring. This makes the fuse a consumable safety component that needs replacing after it has operated.\u003c\/p\u003e\n\u003cp\u003eThe ceramic body with metal end caps meets ASTA approval standards and carries BS 1362 certification, confirming the fuse will rupture at the rated current without arcing or causing secondary damage. Each pack contains 10 fuses supplied on a Knightsbridge blister card with euro slot for retail display. The fuses fit all standard UK 3-pin plugs and fused spur units that accept BS 1362 cartridge fuses.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable style=\"width: 100%; height: 78.4px;\" class=\"spec_table\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 57.7168%; height: 19.6px;\"\u003eDiameter\u003c\/td\u003e\n\u003ctd style=\"width: 39.8016%; height: 19.6px;\"\u003e6.35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 57.7168%; height: 19.6px;\"\u003eLength\u003c\/td\u003e\n\u003ctd style=\"width: 39.8016%; height: 19.6px;\"\u003e25.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 57.7168%; height: 19.6px;\"\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd style=\"width: 39.8016%; height: 19.6px;\"\u003e230V 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 57.7168%; height: 19.6px;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"width: 39.8016%; height: 19.6px;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_2003124_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhen should a fuse be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eReplace the fuse when an appliance stops working and you have ruled out the socket itself being faulty. A blown fuse appears as a break in the internal wire element visible through the ceramic body, or may show scorch marks on the end caps. Do not replace a fuse multiple times on the same appliance without investigating the underlying fault.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat appliances use 13A fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMost high-draw UK appliances including kettles, toasters, washing machines, tumble dryers, irons, microwaves, heaters and vacuum cleaners use 13A fuses in their plugs. Lower-power devices like lamps, radios and phone chargers typically use 3A or 5A fuses instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these compatible with all UK plugs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. BS 1362 is the UK standard for cartridge fuses used in domestic plugs and fused connection units. These fuses fit any plug or spur unit designed to accept BS 1362 cartridge fuses at 6.35mm diameter and 25.4mm length.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many fuses are in the pack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe pack contains 10 fuses supplied on a Knightsbridge blister card.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293960429835,"sku":"SN13AFUSE","price":2.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/162672_eccb0dc1-edf5-4323-ac21-1953e9ab6e9c.jpg?v=1714666875"},{"product_id":"3a-fuse-bs-1362-certified-10-pack","title":"3A Fuse BS 1362 Certified - 10 Pack","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge 3A fuse is a BS 1362 certified cartridge fuse rated at 3A for 240V 50Hz mains circuits. Each fuse measures 6.35mm diameter by 25.4mm length, fitting standard UK 13A plug fuse holders. The pack contains 10 fuses supplied on a blister card with euro slot for retail display.\u003c\/p\u003e\n\u003cp\u003eUsed in 13A plugs for low-draw appliances such as table lamps, televisions, radios, small kitchen appliances and chargers, the 3A rating provides circuit protection up to 720W on 240V. The ASTA approval confirms compliance with British Standard 1362, the specification for fuses used in UK domestic plugs and adaptors. The ceramic body is filled with silica sand to suppress arcing when the fuse element melts under overload.\u003c\/p\u003e\n\u003cp\u003eThe 10-pack format suits trade electricians, facilities managers and households keeping spare fuses for multiple appliances. Each fuse is marked with the 3A rating and the BS 1362 certification symbol in red print on the ceramic body, making identification straightforward when replacing a blown fuse in a plug.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e6.35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e25.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e230V 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_2003111_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat appliances use a 3A fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e3A fuses are used in 13A plugs for appliances drawing up to 720W on 240V mains, including table lamps, floor lamps, televisions, radios, DVD players, set-top boxes, phone chargers and small kitchen appliances like kettles under 720W. Higher-draw appliances such as vacuum cleaners, irons and most kitchen appliances require 13A fuses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these compatible with all UK 13A plugs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 6.35mm x 25.4mm dimensions are the BS 1362 standard size for all UK 13A domestic plugs and fused adaptors. The fuse fits any plug with a removable fuse holder.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does BS 1362 certification mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBS 1362 is the British Standard for cartridge fuses used in 13A plugs and adaptors. Certification to BS 1362 confirms the fuse meets safety requirements for breaking capacity, temperature rise, mechanical strength and marking. ASTA approval provides independent third-party verification of compliance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know when a fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen a fuse blows, the appliance stops working and the fuse element inside the ceramic body will be visibly broken or blackened. Remove the fuse from the plug and hold it up to light — if the metal strip running through the centre is intact, the fuse is still good. If the strip is broken or missing, replace it with a new 3A fuse.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293962592523,"sku":"SN3AFUSE","price":2.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/162674_d0ed62e1-f72e-4e88-b8a2-b498be1c2955.jpg?v=1714666920"},{"product_id":"5a-fuse-bs-1362-pack-of-10","title":"5A Fuse BS 1362 - Pack of 10","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge 5A fuse is a BS 1362 certified cartridge fuse rated for 230V 50Hz mains circuits. Each fuse measures 6.35mm diameter by 25.4mm length, fitting standard UK plug fuse holders and consumer unit fuse carriers. ASTA approval confirms independent testing to British safety standards.\u003c\/p\u003e\n\u003cp\u003e5A fuses protect lighting circuits and low-power appliances drawing up to 1,150W on 230V mains. Common applications include table lamps, standard lamps, decorative lighting, battery chargers, alarm clocks, radios and other low-draw domestic equipment where a 3A or 5A fuse provides closer protection than a 13A. Using the correct fuse rating prevents cable overheating if a fault develops in the appliance or circuit.\u003c\/p\u003e\n\u003cp\u003eThe ceramic body with nickel-plated end caps provides reliable thermal and electrical performance across the fuse's rated service life. Each pack contains 10 fuses supplied on a Knightsbridge blister card with euro slot for retail display. The fuses carry a 1-year warranty from the date of purchase.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e6.35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e25.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e230V 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_2003121_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat appliances need a 5A fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e5A fuses suit table lamps, floor lamps, decorative lighting, radios, alarm clocks, battery chargers and other low-power equipment drawing up to 1,150W on 230V mains. Check the appliance nameplate or manual to confirm the correct fuse rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these compatible with standard UK plugs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 6.35mm x 25.4mm dimensions match the BS 1362 standard for UK plug fuses, fitting all standard 13A plugs with removable fuse carriers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between 3A, 5A and 13A fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe rating controls the maximum current the fuse can carry before it blows. A 3A fuse protects appliances up to 690W, a 5A fuse up to 1,150W, and a 13A fuse up to 3,000W. Always use the lowest rating that allows the appliance to operate normally, providing closer protection if a fault develops.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293963936011,"sku":"SN5AFUSE","price":2.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/162676_34f99b4b-fc45-4f81-af14-d69b0ddb417c.jpg?v=1714666936"},{"product_id":"mixed-fuses-10-pack-3x3a-3x5a-4x13a-bs-1362","title":"Mixed Fuses 10 Pack (3x3A, 3x5A, 4x13A) - BS 1362","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThis Knightsbridge mixed fuse pack contains ten ceramic cartridge fuses in the three most common UK plug ratings: three 3A fuses, three 5A fuses and four 13A fuses. Each fuse is a 6.35mm diameter by 25.4mm length ceramic-bodied cartridge rated for 230V 50Hz mains, certified to BS 1362 and ASTA approved.\u003c\/p\u003e\n\u003cp\u003eThe pack covers the typical household requirement: 3A fuses for low-power appliances (table lamps, phone chargers, small electronics under 720W), 5A fuses for mid-power devices (desk lamps, radios, smaller power tools up to 1,150W), and 13A fuses for higher-draw appliances (kettles, vacuum cleaners, washing machines, irons up to 3,000W). Keeping a mixed pack on hand means you can replace a blown fuse immediately without needing to identify the correct rating first and make a separate trip to buy one.\u003c\/p\u003e\n\u003cp\u003eAll ten fuses arrive on a blister card with a euro slot for retail display or storage in a cupboard. The ceramic body on each fuse provides better thermal stability than glass-bodied alternatives and breaks cleanly when the fuse blows, making visual inspection straightforward. The metal end caps are nickel-plated for corrosion resistance and low contact resistance inside the plug fuse carrier.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e6.35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e25.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e230V 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_2003126_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know which rating fuse to use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMatch the fuse rating to the appliance load. Use 3A for devices up to 720W, 5A for devices up to 1,150W, and 13A for devices up to 3,000W. Most appliance manuals specify the correct fuse rating, and the rating is often printed on the back of the appliance near the power cable entry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these fuses compatible with all UK plugs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 6.35mm diameter by 25.4mm length dimension is the standard UK plug fuse size, and these fuses are BS 1362 certified, which is the British Standard for fuses in plugs and adaptors rated up to 13A.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does ASTA approval mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eASTA is an independent testing and certification body. ASTA approval confirms that the fuses meet the safety and performance requirements of BS 1362, which includes breaking capacity, current-carrying ability and temperature rise limits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a higher-rated fuse than the appliance requires?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Always use the fuse rating specified by the appliance manufacturer. Using a higher-rated fuse (e.g. a 13A fuse in a lamp that requires 3A) removes the protective function of the fuse and increases the risk of cable overheating or fire if the appliance develops a fault.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":45293983105291,"sku":"SNMIXEDFUSE","price":2.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/162678_00d2681e-2ae3-4b85-8bc1-84e28b1fa59a.jpg?v=1714667104"},{"product_id":"mercury-5-x-20mm-t100ma-slow-blow-fuse-250v","title":"Mercury 5 x 20mm T100mA Slow Blow Fuse - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T100mA is a slow blow fuse in a 5 x 20mm glass tube with metal end caps, rated at 250V and 100mA (0.1A). The time-delay element inside the glass allows brief surge currents during equipment start-up or motor inrush without blowing, while still protecting against sustained overcurrent or short circuits at 100mA and above.\u003c\/p\u003e\n\u003cp\u003eDesigned for low-current electronic equipment, audio amplifiers, power supplies and precision instrumentation where brief surges need to be tolerated but sustained fault current must be interrupted. The 5 x 20mm tube fits standard fuse clips and panel-mount holders common in European and UK electrical equipment. The glass tube allows visual inspection of the fuse element without removal.\u003c\/p\u003e\n\u003cp\u003eThe T-rated (time-delay) element distinguishes this from an F-rated (fast-blow) fuse of the same physical size. Under sustained 100mA overcurrent the fuse will blow within seconds to minutes depending on the exact overload factor, but transient surges up to several hundred milliamps lasting a few milliseconds will not cause nuisance blowing. The metal end caps provide a secure grip in spring-loaded fuse clips.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does T100mA mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe T indicates a time-delay (slow blow) fuse, and 100mA is the rated current. The fuse will tolerate brief surge currents above 100mA during equipment start-up, but will blow under sustained overcurrent to protect the circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage is it rated for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e250V. This is the maximum voltage the fuse can safely interrupt when it blows. Using the fuse in circuits above 250V can result in dangerous arcing when the fuse element melts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (T-rated) fuses have a time-delay element that tolerates brief surge currents without blowing, making them suitable for circuits with inductive loads or equipment that draws higher current at start-up. Fast blow (F-rated) fuses interrupt overcurrent immediately and are used where surge tolerance is not required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this in place of a higher-rated fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Always replace a fuse with one of the same rating and type. Using a lower-rated fuse (like a 100mA in place of a 500mA) will cause nuisance blowing. Using a higher-rated fuse in a 100mA circuit removes the protection the original fuse was providing.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313484488971,"sku":"787.000UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787000UK_LB1_4fca5a87-c25e-468c-919a-b40b68f42a0f.jpg?v=1715194089"},{"product_id":"mercury-5-x-20mm-t125ma-slow-blow-fuse-250v","title":"Mercury 5 x 20mm T125mA Slow Blow Fuse - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T125mA is a 5 x 20mm glass tube slow blow fuse rated at 125mA and 250V, designed to protect sensitive electronics from sustained overcurrent faults while tolerating brief inrush surges during startup. The glass body houses a thin wire element that deliberately delays melting when current exceeds the rated 125mA, allowing short-duration spikes to pass without interruption.\u003c\/p\u003e\n\u003cp\u003eUsed in audio equipment, control circuits, power supplies and instrument repair, slow blow fuses prevent nuisance blowing during motor startups, capacitor charging cycles and transformer inrush events where current can briefly spike to several times the steady-state load. The 5 x 20mm size is a standard IEC dimension, fitting fuse holders in most consumer electronics, musical equipment and measurement devices manufactured from the 1980s onwards.\u003c\/p\u003e\n\u003cp\u003eThe metal end caps provide electrical contact and mechanical retention inside a spring-clip fuse holder. The transparent glass tube allows visual inspection of the internal wire element. An intact wire indicates a good fuse, while a broken or discoloured element shows the fuse has blown. The 250V rating handles mains-derived circuits in UK and European equipment operating on 230V AC supplies.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow fuse tolerates brief overcurrent surges (typically lasting milliseconds to a few seconds) before melting, making it suitable for circuits with inrush loads like motors or transformers. A fast blow fuse melts almost immediately when current exceeds its rating, providing faster protection but blowing more easily during startup surges.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 5 x 20mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis size appears in amplifiers, mixing desks, DJ equipment, guitar pedals, synthesisers, computer power supplies, test equipment and older domestic appliances. Check your equipment's service manual or the markings on the existing fuse holder to confirm size and rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a T125mA with a higher-rated fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Installing a higher-rated fuse (e.g. T250mA or T500mA) removes the protection the original circuit was designed around and risks damage to components or fire in the event of a genuine fault. Always replace with the same rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLook through the glass tube. An intact fuse shows a continuous thin wire running between the two end caps. A blown fuse shows a broken or vaporised wire, often with blackening or clouding of the glass where the element melted.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313484685579,"sku":"787.001UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787001UK_LB1_481d1dba-3b11-4396-8876-8035848d5117.jpg?v=1715194092"},{"product_id":"mercury-5-x-20mm-t160ma-slow-blow-fuses-250v","title":"Mercury 5 x 20mm T160mA Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T160mA slow blow fuse is a 5 x 20mm glass tube cartridge fuse rated at 160 milliamps and 250V, designed for low-current protection in precision electronic and audio equipment. The time-delay characteristic allows the fuse to tolerate brief inrush currents during power-on without blowing, then protect against sustained overcurrent faults.\u003c\/p\u003e\n\u003cp\u003eUsed in professional audio amplifiers, studio monitoring equipment, mixing desks, effects units, and other sensitive electronics where a standard fast-blow fuse would nuisance-trip on startup surge, the slow blow rating provides circuit protection without false triggering. The 5 x 20mm format fits standard cartridge fuse holders in mains input stages and power supply sections across European and international audio and electronic devices.\u003c\/p\u003e\n\u003cp\u003eThe glass tube construction allows visual inspection of the internal fusible element. A blown fuse shows a visible break in the thin wire element inside the tube. The 160mA rating suits low-power signal-processing equipment and devices drawing less than 40W on 250V mains. IEC approval confirms compliance with international safety standards for fuse performance and rating.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow (time-delay) fuse tolerates brief overcurrent conditions such as inrush surge when equipment powers on, but will blow if the overcurrent is sustained for more than a fraction of a second. This prevents nuisance blowing in devices with high startup current draw.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat devices use 160mA fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLow-current audio equipment, studio monitoring amplifiers, effects processors, mixers, and precision electronic devices drawing less than 40W on 250V mains typically use 160mA-rated fuses in their power supply protection stages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these fuses interchangeable with fast-blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePhysically they fit the same 5 x 20mm fuse holders, but functionally they are not interchangeable. Replacing a slow blow fuse with a fast blow fuse may result in nuisance blowing during power-on. Always replace with the same rating and type specified by the equipment manufacturer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow can I tell if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass tube construction allows visual inspection. A blown fuse will show a visible break in the thin internal wire element, and often a dark discolouration or carbon deposit on the inside of the glass.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313484718347,"sku":"787.002UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787002UK_LB1_5a3ae9c2-1874-403f-8397-4774a07dc2e1.jpg?v=1715194096"},{"product_id":"mercury-5-x-20mm-t250ma-slow-blow-fuses-glass-cartridge","title":"Mercury 5 x 20mm T250mA Slow Blow Fuses - Glass Cartridge","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T250mA is a 5 x 20mm glass cartridge slow blow fuse rated at 250mA (0.25A) on 250V circuits. The time-delay design allows brief inrush currents during equipment startup or motor spin-up before blowing, while still protecting against sustained overcurrent conditions that would damage sensitive low-power electronics.\u003c\/p\u003e\n\u003cp\u003eDesigned for use in audio equipment, small transformers, power supply boards, LED drivers, control panels and other low-current circuits where a standard fast-blow fuse would nuisance-trip during normal operation. The 5 x 20mm dimension is the IEC standard for small panel-mount and PCB fuseholders, making these fuses compatible with most European and UK electrical equipment using this form factor.\u003c\/p\u003e\n\u003cp\u003eThe glass tube body allows visual inspection of the internal fuse element without removal, so a blown fuse can be identified at a glance. The nickel-plated brass end caps provide reliable contact with the fuseholder terminals and resist corrosion in dusty environments. Each fuse is IEC compliant and suitable for incorporation into CE-marked equipment.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow (time-delay) fuse allows brief overcurrent surges during startup without blowing, but will interrupt the circuit if the overcurrent condition persists for more than a few milliseconds. This prevents nuisance blowing in circuits with inductive loads or capacitor charging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 5 x 20mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis fuse size is common in audio amplifiers, mixing desks, powered speakers, LED power supplies, small transformers, control boards and electronic test equipment. Check your equipment manual or the existing fuse marking to confirm size and rating before replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a fast-blow fuse with a slow blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly if the equipment manufacturer specifies a slow blow (time-delay or 'T' rated) fuse in the original design. Using a slow blow fuse where a fast blow is specified can allow prolonged overcurrent conditions that damage components before the fuse blows.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the 'T' designation mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 'T' prefix in T250mA indicates a time-delay (slow blow) characteristic, as opposed to 'F' for fast-acting or no prefix for medium-speed fuses. This is part of the IEC fuse rating standard.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313484816651,"sku":"787.004UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787004UK_LB1_9bfaccb3-315a-447e-890a-1b8da38f611c.jpg?v=1715194102"},{"product_id":"mercury-5-x-20mm-t315ma-slow-blow-fuse-250v-iec","title":"Mercury 5 x 20mm T315mA Slow Blow Fuse - 250V IEC","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury 5 x 20mm T315mA is a slow blow fuse rated at 315mA and 250V, designed to protect sensitive electronic circuits from sustained overcurrent while tolerating brief inrush surges. The glass tube body measures 5mm in diameter by 20mm in length, with nickel-plated brass end caps that fit standard PCB-mount and panel-mount fuse holders.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses differ from fast-acting fuses by incorporating a time-delay element that allows temporary current spikes to pass without blowing the fuse. This makes them suitable for audio equipment, power supplies, motor controllers and other circuits where switch-on inrush current briefly exceeds the steady-state operating current. The T315mA rating means the fuse will carry 315mA continuously and tolerate short surges above that threshold without interrupting the circuit.\u003c\/p\u003e\n\u003cp\u003eThe fuse carries IEC certification, confirming it meets international safety and performance standards for overcurrent protection devices. The glass body allows visual inspection of the internal element to confirm whether the fuse has blown. Each fuse weighs approximately 0.3g and can be replaced without soldering in clip-style or drawer-style fuse holders.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses include a time-delay element that allows brief current surges to pass without blowing. This prevents nuisance blowing during switch-on or other temporary high-current events, while still protecting the circuit from sustained overcurrent.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between T315mA and F315mA?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 'T' prefix indicates a time-delay (slow blow) characteristic. An 'F' prefix would indicate a fast-acting fuse with no delay. For circuits with inrush current, the T-rated version is usually the correct choice.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage is this rated for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fuse is rated at 250V. This is the maximum voltage at which the fuse can safely interrupt an overcurrent fault. Using it in circuits below 250V is acceptable; using it above 250V is not.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows you to see the internal element. A blown fuse will show a broken or discoloured wire inside the tube. If the element appears intact and continuous, the fuse is likely still functional.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485046027,"sku":"787.005UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787005UK_LB1_f7b0346b-31b7-4947-b23d-f86deb2b05db.jpg?v=1715194106"},{"product_id":"mercury-5-x-20mm-t500ma-slow-blow-fuse-glass-cartridge","title":"Mercury 5 x 20mm T500mA Slow Blow Fuse - Glass Cartridge","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T500mA is a 5 x 20mm glass cartridge fuse rated at 500mA with a slow-blow (time-delay) characteristic, designed to protect sensitive electronics from sustained overcurrent while tolerating short inrush surges. The glass body allows visual inspection of the internal wire element, and the fuse is rated at 250V AC to suit standard UK mains-derived circuits.\u003c\/p\u003e\n\u003cp\u003eUsed in amplifiers, control boards, LED drivers, audio equipment and low-power lighting circuits where initial switch-on current can briefly exceed the nominal operating current, the slow-blow design prevents nuisance trips during normal start-up. The 500mA rating suits circuits drawing between 200-450mA continuous load, with headroom for transient peaks up to approximately 800mA for several seconds before the element melts.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm format fits standard fuse clips and panel-mount holders found in most audio amplifiers, mixer desks, LED power supplies and control panels. The glass construction meets IEC standards for low-voltage fuses and provides a clear visual indication when the fuse has blown. The wire element separates and usually leaves scorch marks on the inside of the glass tube.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow-blow and fast-blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow-blow fuses tolerate brief current surges (such as capacitor inrush or motor start-up) without blowing, whereas fast-blow fuses trip immediately when current exceeds the rated value. Slow-blow fuses are preferred in audio, lighting and control circuits where start-up current can temporarily exceed the running current.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat current does the T500mA rating protect?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e500mA is the nominal rating. The fuse will carry 500mA continuously without blowing, and will tolerate brief surges of approximately 800mA-1A for a few seconds. Sustained overcurrent beyond that range will cause the element to melt and break the circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection. When blown, the internal wire element will be visibly broken, often with scorch marks or black residue on the inside of the glass tube. If the wire is intact and the fuse still does not conduct, test with a multimeter set to continuity mode.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these fuses supplied individually or in packs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the product quantity selector on this page. Mercury fuses are typically sold in packs of multiple units rather than individually.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485111563,"sku":"787.007UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787007UK_LB1_8ff5b23e-e493-45e2-bcc9-f597445ec061.jpg?v=1715194112"},{"product_id":"mercury-5-x-20mm-t630ma-slow-blow-fuses-250v","title":"Mercury 5 x 20mm T630mA Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T630mA is a 5 x 20mm slow blow fuse rated at 630mA and 250V, designed to protect low-current electronics that draw brief startup surges without blowing on normal transient spikes. The time-delay element inside the glass body allows short bursts of overcurrent to pass while still interrupting sustained faults within milliseconds.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses are used in power supplies, audio amplifiers, LED drivers, motor controllers and precision measurement equipment where inrush current on power-up can be several times the normal running current. A standard fast-acting fuse would blow during normal startup in these circuits, while a slow blow fuse rides out the surge and protects against genuine faults. The 5 x 20mm size is an IEC standard fitting common in Euro-style equipment and many mains-powered devices.\u003c\/p\u003e\n\u003cp\u003eEach fuse has nickel-plated brass end caps and a clear glass body, allowing visual inspection of the filament to confirm whether the fuse has blown. The 630mA rating suits circuits drawing up to approximately 0.5A continuous, with headroom to tolerate brief peaks during switching or motor starting. The 250V AC rating covers standard UK mains-derived supplies after transformer or rectification.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow (or time-delay) fuse tolerates brief overcurrent surges without blowing, but will still interrupt sustained faults. This makes them suitable for circuits with high startup current, like transformers and motors, where a fast-acting fuse would blow during normal power-up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 5 x 20mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis size is common in mains-powered audio equipment, small power supplies, LED drivers, older test equipment, and many European-designed devices. Check your equipment's manual or the blown fuse's markings to confirm the size and rating needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a fast-acting fuse with a slow blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Fuse type (fast or slow) is chosen to match the protected circuit's characteristics. Using the wrong type can result in nuisance blowing (fast in place of slow) or delayed protection during faults (slow in place of fast). Always replace with the same type specified by the equipment manufacturer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these sold individually or in packs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the product listing above for pack quantity. Mercury fuses are typically sold in packs of 10 or more for trade and maintenance use.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485504779,"sku":"787.008UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787008UK_LB1_db7e747e-de51-4a6e-80d8-e51dd5249dc0.jpg?v=1715194116"},{"product_id":"mercury-t800ma-5-x-20mm-slow-blow-fuse-250v-time-delay","title":"Mercury T800mA 5 x 20mm Slow Blow Fuse - 250V Time Delay","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T800mA is a 5 x 20mm glass cartridge fuse with a time-delay (slow blow) element, rated at 800mA breaking capacity and 250V maximum voltage. The time-delay characteristic allows the fuse to tolerate brief current surges during device startup or motor inrush without blowing, while still protecting against sustained overcurrent faults.\u003c\/p\u003e\n\u003cp\u003eDesigned for low-current electronics, audio equipment, control panels and instruments where startup current can temporarily exceed the steady-state operating current, the slow blow design prevents nuisance tripping during normal operation. The 5 x 20mm glass cartridge format fits standard panel-mount and PCB-mount fuse holders, with nickel-plated end caps providing reliable contact and corrosion resistance.\u003c\/p\u003e\n\u003cp\u003eThe fuse is built to IEC standards and carries the appropriate approval markings for use in consumer and industrial equipment sold in the UK and EU. The 800mA rating sits between the more common 500mA and 1A values, making it suitable for equipment drawing steady currents in the 400-600mA range where a 500mA fast-blow fuse would trip prematurely but a 1A fuse would provide insufficient protection.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is a slow blow fuse and when is it needed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow (time-delay) fuse tolerates brief current surges without blowing, typically for 10-100 milliseconds depending on the surge magnitude. This prevents the fuse from tripping during motor startup, transformer inrush, or capacitor charging events in equipment that has a higher startup current than running current.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 800mA fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCommon applications include mixing desks, guitar amplifiers, control panels, instrumentation, LED drivers and low-power DC supplies. The 800mA rating protects circuits drawing steady currents between 400-600mA where a 500mA fuse is too sensitive and a 1A fuse provides inadequate protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this fuse reusable after it blows?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Glass cartridge fuses are single-use consumables. Once the internal element melts under fault current, the fuse must be replaced. Always replace a blown fuse with the same rating and type. Do not substitute a higher-rated or fast-blow fuse.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the physical size?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fuse measures 5mm diameter by 20mm length, fitting standard 5 x 20mm fuse holders. The glass body is transparent, allowing visual inspection of the internal wire element to confirm whether the fuse has blown.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485603083,"sku":"787.009UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787009UK_LB1_4ee78881-1279-4d36-b9a2-79b915a21eb9.jpg?v=1715194119"},{"product_id":"mercury-5-x-20mm-t1a-slow-blow-fuse-250v-iec-certified","title":"Mercury 5 x 20mm T1A Slow Blow Fuse - 250V IEC Certified","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T1A is a 5 x 20mm glass tube slow blow fuse rated at 1A continuous current and 250V, carrying IEC certification for use in consumer electronics, audio equipment, test instruments and similar mains-powered devices. The delay-action element inside the glass tube tolerates brief inrush currents during motor startup, capacitor charging and transformer energisation without breaking the circuit, then trips on sustained overcurrent or short-circuit conditions.\u003c\/p\u003e\n\u003cp\u003eDesigned for equipment with capacitive or inductive loads where a fast-blow fuse would cause nuisance tripping, the T1A handles transient current peaks that last a few milliseconds to a few hundred milliseconds before the element heats enough to melt. This makes it suitable for protecting power supplies, amplifiers, motors and other devices where normal operation includes short-duration current surges above the 1A steady-state rating.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm dimension is a standard metric fuse size found in IEC-compliant fuseholders on equipment sold across Europe and the UK. The glass tube construction allows visual inspection of the element without removing the fuse from the holder. A broken wire or darkened glass indicates a blown fuse. The nickel-plated brass end caps provide corrosion resistance and good electrical contact in standard panel-mount or PCB-mount fuseholders.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow fuse has a thicker element or additional mass that takes longer to heat and melt under overcurrent. This delays tripping during brief startup surges that would immediately blow a fast-acting fuse. For sustained overcurrent or short-circuit conditions, both types eventually trip. The slow blow just gives a few hundred milliseconds of tolerance for transient peaks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does T1A mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 'T' prefix indicates a time-delay (slow blow) characteristic. The '1A' is the nominal current rating. The fuse is designed to carry 1A continuously without tripping, and to trip on sustained currents above that threshold.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace a fast blow 1A fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly if the equipment is designed to accept a time-delay fuse. Substituting a slow blow for a fast blow reduces the speed of overcurrent protection, which may be unsafe in circuits requiring fast disconnection. Check the equipment manual or the original fuse marking before swapping fuse types.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many fuses are in a pack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePack quantities vary. Check the product specification or contact Niori to confirm the quantity supplied with this SKU.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485635851,"sku":"787.010UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787010UK_LB1_d1642a1e-7b97-435a-9d9e-68e3076aac72.jpg?v=1715194122"},{"product_id":"mercury-5-x-20mm-t1-25a-slow-blow-fuse-250v-iec-approved","title":"Mercury 5 x 20mm T1.25A Slow Blow Fuse - 250V IEC Approved","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T1.25A is a 5 x 20mm slow blow fuse rated to 1.25A at 250V, built with a time-delay element that tolerates short inrush current peaks without rupturing. The glass tube houses a thin nickel-plated copper wire mounted on nickel-plated brass end caps, visible through the transparent casing for visual confirmation of blown status.\u003c\/p\u003e\n\u003cp\u003eDesigned for low-current electronics that draw transient surge loads during startup or switching, the slow blow characteristic allows temporary overcurrent events (motor startup, capacitor charging, transformer energisation) to pass without breaking the circuit, while still protecting against sustained overload or short circuit faults. Common applications include audio equipment, LED drivers, control panels, and small power supplies where nuisance tripping from standard fast-blow fuses would be a problem.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm format fits standard panel-mount fuse holders, PCB-mount clips, and in-line cable holders across consumer electronics, industrial control gear, and test equipment. The IEC approval confirms the fuse meets international safety standards for breaking capacity and time-delay characteristics. Each fuse is marked with the current rating and time-delay designation (T1.25A) on the end cap for identification when installed.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (also called time-delay or T-rated) fuses tolerate brief overcurrent surges without blowing, then rupture under sustained overload. This prevents nuisance tripping from startup currents in motors, transformers and capacitive loads, while still protecting against genuine faults.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage rating does it carry?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fuse is rated to 250V. It can be used on lower voltages (12V, 24V, 48V, 120V circuits) but not on voltages exceeding 250V.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass tube is transparent. When the fuse blows, the internal wire element ruptures and you will see a visible break in the wire, often with scorch marks on the inside of the glass. If the wire appears intact and continuous, the fuse is still functional.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it replace a fast-blow fuse of the same rating?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot directly. Slow blow and fast blow fuses have different time-current characteristics. Using a slow blow fuse where a fast blow is specified may leave the circuit under-protected during fault conditions. Always replace fuses with the same type (slow blow or fast blow) and rating specified by the equipment manufacturer.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485668619,"sku":"787.011UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787011UK_LB1_9ffef11b-2718-414c-9d55-0fc02ae1ea4a.jpg?v=1715194126"},{"product_id":"mercury-t1-6a-slow-blow-fuse-5-x-20mm-250v-iec-approved","title":"Mercury T1.6A Slow Blow Fuse 5 x 20mm - 250V IEC Approved","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T1.6A is a slow blow fuse in a 5x20mm glass cartridge format, rated to 250V and IEC approved for use in sensitive electrical equipment. The slow blow (time-delay) construction allows controlled inrush currents during equipment start-up without blowing, while still interrupting the circuit if a sustained fault occurs.\u003c\/p\u003e\n\u003cp\u003eDesigned for protection of low-power electronics, audio equipment, control circuits and appliances where transient start-up loads exceed the steady-state current draw, the fuse sits in a standard 5x20mm panel-mount or PCB-mount fuse holder. The 1.6A rating handles continuous currents up to that threshold, with the time-delay element tolerating brief spikes during motor start, transformer energising or capacitor charging.\u003c\/p\u003e\n\u003cp\u003eThe glass cartridge body allows visual inspection of the fuse element without removing it from the holder. A blown fuse shows a broken filament visible through the clear tube. The nickel-plated metal end caps provide corrosion resistance and maintain good contact in the fuse holder terminals. IEC approval confirms the fuse meets international safety and performance standards for electrical protection devices.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast-acting fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (time-delay) fuses tolerate brief current spikes without blowing, making them suitable for equipment with inrush currents at start-up. Fast-acting fuses blow immediately when current exceeds the rating, protecting against short circuits but unsuitable for loads with transient peaks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat fuse holder does it fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 5x20mm cartridge fits any standard 5x20mm panel-mount or PCB-mount fuse holder. Common holder types include chassis-mount clips, inline cable holders and printed circuit board sockets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this in place of a fast-acting fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot recommended. If the original equipment specified a fast-acting fuse, replacing it with a slow blow type reduces short-circuit protection and may allow fault currents to persist longer than the circuit design intended. Always match the fuse type to the equipment specification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the fuse reusable after it blows?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Once blown, the fuse must be replaced. Attempting to repair or bypass a blown fuse removes circuit protection and creates a fire hazard.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485701387,"sku":"787.012UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787012UK_LB1_86c38e0e-eaff-49f2-b685-380251226878.jpg?v=1715194130"},{"product_id":"mercury-5-x-20mm-t2a-slow-blow-fuses-250v-time-delay","title":"Mercury 5 x 20mm T2A Slow Blow Fuses - 250V Time Delay","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T2A is a 5 x 20mm slow blow fuse rated at 2A and 250V, housed in a standard glass cartridge with nickel-plated end caps. The time-delay characteristic allows temporary current surges during device startup to pass without blowing the fuse, while still providing overcurrent protection once the circuit reaches steady-state operation.\u003c\/p\u003e\n\u003cp\u003eDesigned for low-current electronics, audio equipment, control circuits and instrumentation where inrush current spikes occur during power-on, the slow blow construction uses a thicker filament element than fast-acting fuses. This allows brief overloads of several times the 2A rating for a few hundred milliseconds before the fuse element melts and breaks the circuit. The 250V rating makes it suitable for both mains-voltage and low-voltage DC circuits.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm glass cartridge fits standard panel-mount and PCB-mount fuse holders used across consumer electronics, amplifiers, DJ equipment and measurement devices. The transparent glass tube allows visual inspection of the fuse element to confirm whether it has blown. IEC approval confirms the fuse meets international safety standards for overcurrent protection devices.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast-acting fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses tolerate brief current surges without blowing, making them suitable for devices with high startup current (motors, transformers, power supplies). Fast-acting fuses blow immediately when current exceeds the rating, protecting more delicate circuits where any overcurrent indicates a fault.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does T2A mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eT indicates time-delay or slow blow operation. 2A is the rated continuous current. The fuse will carry 2A indefinitely but will blow if the current exceeds this for an extended period. Brief surges above 2A are tolerated during startup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace an F2A or FF2A fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. F indicates fast-acting and FF indicates very fast-acting. Replacing a fast fuse with a slow blow fuse removes protection from circuits designed to clear faults quickly, which could allow damage during short circuits or overloads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the fuse removed from a holder?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor panel-mount holders with screw caps, unscrew the cap and the fuse will drop out. For spring-clip PCB holders, gently pull the fuse out lengthways. Always disconnect power before replacing fuses.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313485766923,"sku":"787.013UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787013UK_LB1_a2fedeed-3652-426c-837f-c4cd7aa52882.jpg?v=1715194133"},{"product_id":"mercury-5-x-20mm-t2-5a-slow-blow-fuse-250v-time-delay","title":"Mercury 5 x 20mm T2.5A Slow Blow Fuse - 250V Time-Delay","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T2.5A is a 5 x 20mm slow blow fuse rated for 250V with a time-delay mechanism that allows brief power surges to pass through without blowing, while still protecting against sustained overloads above 2.5A. The glass body houses a single fuse wire visible through the transparent casing, with nickel-plated brass end caps providing contact at each terminal.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses (also called time-delay or T-rated fuses) are used in small equipment that draws brief high-current loads on startup or during operation, such as motors, transformers, power supplies and audio amplifiers. The T2.5A rating means the fuse can handle short-duration current spikes above 2.5A without interrupting the circuit, but will blow if the overcurrent condition persists for more than a few seconds. This prevents nuisance blowing during normal operation while still providing protection against faults.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm format is one of the most common cartridge fuse sizes internationally and fits standard panel-mount fuse holders, inline cable fuse holders and PCB-mount clips used across consumer electronics, audio equipment, lighting control gear and industrial control panels. The fuse conforms to IEC 60127 standards for small fuses, ensuring dimensional and performance compatibility with equipment designed to those specifications.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA fast blow (F-rated) fuse interrupts the circuit almost immediately when current exceeds its rating. A slow blow (T-rated) fuse like this one tolerates brief overcurrent conditions for a few seconds, allowing motors and transformers to start without blowing the fuse, but still protects against sustained faults.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage is this rated for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fuse is rated for 250V maximum. It can be used in circuits operating at lower voltages (e.g. 12V, 24V, 110V, 230V) but must not be used in circuits exceeding 250V.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many fuses are included?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe product listing shows individual fuses. Check the quantity selector or product description for pack size. Mercury fuses are typically sold in packs of 10 or boxes of 100.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my equipment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf your equipment specifies a 5 x 20mm fuse holder and requires a T2.5A or 2.5A slow blow rating, this fuse will fit. Do not substitute a different current rating or fuse type (e.g. Fast blow) unless you are certain the equipment can tolerate the change.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486258443,"sku":"787.014UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787014UK_LB1_74547ddd-1257-4a21-999d-1f20cf48aa42.jpg?v=1715194136"},{"product_id":"mercury-t3-15a-5-x-20mm-slow-blow-fuses-250v","title":"Mercury T3.15A 5 x 20mm Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T3.15A is a 5 x 20mm glass slow blow fuse rated at 250V, designed to protect sensitive electronics from overcurrent conditions while tolerating the brief inrush currents that occur when equipment powers up. The glass tube construction allows visual inspection of the fuse wire, so you can confirm whether the fuse has blown without needing a multimeter.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses use a thicker fuse wire or a spring-loaded mechanism that delays the break action, allowing short-duration current surges to pass without triggering the fuse. This makes them suitable for audio amplifiers, power supplies, motor controllers and other devices where the startup current can spike to several times the running load for a fraction of a second. The 3.15A rating handles continuous loads up to approximately 750W at 240V.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm cartridge format is a standard size for panel-mount fuseholders and PCB-mount clips in consumer electronics, PA equipment and lighting controllers. The metal end caps provide reliable contact with spring-clip fuseholders and can withstand repeated insertion and removal cycles during maintenance. These fuses meet IEC 60127 international standards for safety and performance.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (time-delayed) fuses tolerate brief current surges without breaking, so they suit equipment with high startup currents like amplifiers and motors. Fast blow fuses break immediately when the rated current is exceeded, offering faster protection for sensitive circuits with no inrush tolerance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 5 x 20mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis format is common in PA amplifiers, mixing desks, lighting controllers, power supplies, battery chargers and consumer audio equipment. Check your equipment's user manual or the markings on the existing fuse to confirm the correct size and rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a higher-rated fuse if this one keeps blowing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The fuse rating is chosen to protect the downstream circuit from damage. If a T3.15A fuse blows repeatedly, there is a fault in the equipment or the load exceeds the design limit. Using a higher-rated fuse removes the protective function and risks damaging the equipment or creating a fire hazard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass tube allows you to see the internal fuse wire. If the wire is broken or the glass has darkened from arcing, the fuse has blown and needs replacing.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486291211,"sku":"787.015UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787015UK_LB1_3568a109-93f1-4afa-9c95-ac549a8f0c39.jpg?v=1715194139"},{"product_id":"mercury-5-x-20mm-t4a-slow-blow-fuses-250v-iec","title":"Mercury 5 x 20mm T4A Slow Blow Fuses - 250V IEC","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T4A is a 5 x 20mm glass slow blow fuse rated at 4A and 250V, designed to withstand short bursts of inrush current before tripping. The time-delay element inside the glass tube allows temporary current spikes during equipment startup without interrupting the circuit, while still providing overload protection once the current exceeds the 4A rating for a sustained period.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses are used in audio amplifiers, lighting control equipment, motor-driven appliances and power supplies where startup current can briefly exceed normal operating current by a factor of two to five times. The 5 x 20mm form factor is a standard cartridge size that fits most panel-mount and PCB fuse holders used in consumer electronics, professional audio and stage lighting equipment.\u003c\/p\u003e\n\u003cp\u003eThe Mercury T4A carries IEC approval and is manufactured to comply with IEC 60127 standards for miniature fuses. The glass body allows visual inspection of the fuse element to confirm whether the fuse has blown, and the nickel-plated brass end caps provide reliable contact in fuse holders. Each fuse is marked with the rating, so the installed value can be verified without removal.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow fuse has a time-delay element that tolerates brief current surges above the rated amperage, allowing equipment to start up without tripping the fuse. Once the current remains above the rating for a sustained period, the fuse blows and interrupts the circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between this and a fast-acting fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA fast-acting fuse blows almost immediately when current exceeds the rated amperage, even for a fraction of a second. A slow blow fuse like the T4A allows temporary surges, making it suitable for equipment with high inrush current at startup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 5 x 20mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePanel-mount fuse holders in audio amplifiers, mixing desks, DMX controllers, power supplies and lighting equipment commonly use 5 x 20mm cartridge fuses. Check your equipment's manual or the existing fuse to confirm size and rating before replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this be used in place of a fast-acting 4A fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly if the equipment specifies a slow blow or time-delay fuse. Using a slow blow fuse in a circuit designed for fast-acting protection may delay the fuse's response to a fault condition, potentially allowing damage to components.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486323979,"sku":"787.016UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787016UK_LB1_55ea2707-5cc2-45ad-ae3a-0a3b1684a107.jpg?v=1715194143"},{"product_id":"mercury-5-x-20mm-t5a-slow-blow-fuses-250v","title":"Mercury 5 x 20mm T5A Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T5A is a 5 x 20mm slow blow fuse rated at 5A and 250V, built to IEC specifications. The glass tube construction houses a time-delay fuse wire that tolerates brief inrush current surges without blowing, making it suitable for appliances and equipment that draw higher current on startup before settling to their rated load.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses are used in small motors, transformers, power supplies, audio amplifiers and other devices where the startup current temporarily exceeds the running current. The 5 x 20mm format fits standard fuse holders in consumer electronics, lab equipment, legacy hi-fi systems and industrial control panels. The 5A rating protects circuits drawing up to 5 amps continuous current while tolerating short-duration spikes above that threshold.\u003c\/p\u003e\n\u003cp\u003eEach fuse consists of a clear glass tube with nickel-plated brass end caps. The internal wire is visible through the glass, allowing quick visual inspection to confirm whether the fuse has blown. The 250V capacity covers both UK mains (230V) and lower-voltage DC circuits in automotive and marine applications.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow (or time-delay) fuse tolerates brief current surges above its rating before blowing. This prevents nuisance blowing during equipment startup when motors, transformers or capacitors draw higher inrush current for a few milliseconds or seconds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFast blow fuses respond immediately to any overcurrent condition. Slow blow fuses wait, allowing short-duration surges to pass before opening the circuit. For equipment with high startup current, a slow blow fuse prevents the need to replace fuses every time the device is switched on.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this in mains voltage equipment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating covers UK mains voltage (230V). However, always confirm the fuse type and rating specified by the equipment manufacturer before fitting a replacement. Using the wrong rating or type can create a fire or shock hazard.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe clear glass tube allows visual inspection. A blown fuse shows a broken or discoloured wire inside the tube, often with black soot deposits on the glass. An intact fuse shows a continuous wire running between the two end caps.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486356747,"sku":"787.017UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787017UK_LB1_a84a2554-bfbe-4a2c-a70a-24ab899f5da5.jpg?v=1715194146"},{"product_id":"mercury-5-x-20mm-t6-3a-slow-blow-fuse-250v-time-delay","title":"Mercury 5 x 20mm T6.3A Slow Blow Fuse - 250V Time-Delay","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T6.3A is a slow blow fuse in a 5 x 20mm glass cartridge body with nickel-plated brass end caps, rated at 250V AC. The time-delay element inside the glass tube allows brief inrush currents to pass without blowing while still protecting the circuit from sustained overloads above 6.3A.\u003c\/p\u003e\n\u003cp\u003eDesigned for equipment with moderate startup currents such as small motors, power supplies, transformers and audio amplifiers, the slow blow characteristic prevents nuisance blowing during the initial energisation period when inductive loads briefly draw several times their running current. Once the equipment is running and current stabilises below the 6.3A rating, the fuse holds indefinitely. If a fault causes sustained overcurrent, the fuse element melts and breaks the circuit.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm dimension is a standard cartridge fuse size found in panel-mount fuseholders, inline cable fuseholders and PCB-mount fuse clips across consumer electronics, industrial control panels and lighting equipment. The glass body allows visual inspection of the fuse element. A broken or discoloured element indicates the fuse has blown. These fuses comply with IEC 60127 safety standards for low-voltage fuses in equipment.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (also called time-delay or anti-surge) fuses are designed to tolerate brief current spikes above the rated value without blowing, while still protecting against sustained overloads. This is useful for equipment with inductive loads like motors or transformers that draw several times their normal current for a fraction of a second when first powered on.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a fast-blow fuse with a slow blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot without understanding the circuit requirements. Fast-blow fuses provide tighter overcurrent protection and are specified where immediate cutoff is needed for sensitive components. Replacing a fast-blow with a slow blow may allow damaging currents to persist longer than the circuit was designed for. Replace fuses with the same rating and time-delay characteristic unless you know the circuit can safely accept the change.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does T6.3A mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eT indicates time-delay (slow blow) characteristic. 6.3A is the continuous current rating. The maximum current the fuse can carry indefinitely without melting. The fuse will tolerate brief spikes above 6.3A but will blow if overcurrent is sustained.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these suitable for DC circuits?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThese fuses are rated at 250V AC. Using them in DC circuits is possible but the DC voltage rating is lower than the AC rating due to arc suppression differences. For DC applications consult the manufacturer datasheet to confirm the appropriate voltage deration.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486389515,"sku":"787.018UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787018UK_LB1_2c28bbf3-c225-452b-bc68-48f502aebfee.jpg?v=1715194149"},{"product_id":"mercury-5-x-20mm-t8a-slow-blow-fuses-250v-iec-compliant","title":"Mercury 5 x 20mm T8A Slow Blow Fuses - 250V IEC Compliant","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T8A is a 5 x 20mm glass cartridge fuse rated at 8 amps and 250V, designed with time-delay (slow blow) characteristics to tolerate brief inrush currents without blowing. The fuse uses a thicker element than a fast-acting fuse, allowing it to withstand short-duration surges from motor start-up, transformer inrush, or capacitor charging while still breaking the circuit when a sustained overload or short circuit occurs.\u003c\/p\u003e\n\u003cp\u003eDesigned for electrical equipment, audio amplifiers, power supplies, motor control circuits, and any application where the load draws a temporary spike on start-up but operates within the 8A rating during normal running. The 5 x 20mm format is a standard cartridge size compatible with PCB-mount fuseholders, panel-mount fuseholders, and inline fuseholders used across consumer electronics, professional AV gear, and light industrial equipment.\u003c\/p\u003e\n\u003cp\u003eThe fuse carries IEC certification, confirming it meets international standards for breaking capacity and consistent performance under fault conditions. The glass body allows visual inspection of the element to confirm whether the fuse has blown. Each fuse is stamped with the rating (T8A) and voltage limit (250V) on the end cap for easy identification during installation or replacement.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (time-delay) fuses tolerate brief current surges above the rated amperage without blowing, giving equipment time to settle into its normal operating current. A fast-acting fuse would blow immediately on a motor start-up surge; a slow blow fuse allows the surge for a few seconds before breaking the circuit if the overcurrent persists.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between T8A and F8A?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 'T' prefix indicates a time-delay (slow blow) fuse. An 'F' prefix would indicate a fast-acting fuse that blows immediately on overcurrent. Both are 8A rated, but their response to surge current differs completely.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this fuse suitable for mains voltage use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating covers UK 230V mains circuits with headroom. The fuse is suitable for protecting mains-powered equipment, provided the steady-state current draw does not exceed 8A.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in a 13A plug fuse carrier?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. UK plug fuse carriers use 25 x 6.3mm cartridge fuses (BS 1362). The 5 x 20mm format is for equipment-level protection inside a device or in a separate inline fuseholder, not for plug tops.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486782731,"sku":"787.019UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787019UK_LB1_c9561ad2-419d-405a-bdff-09186e8218a4.jpg?v=1715194153"},{"product_id":"mercury-5-x-20mm-t10a-slow-blow-fuse-250v-iec-approved","title":"Mercury 5 x 20mm T10A Slow Blow Fuse - 250V IEC Approved","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T10A is a 5 x 20mm glass cartridge fuse rated at 10A and 250V, designed as a slow blow (time-delay) fuse for circuits where initial surge current is normal but sustained overload must be interrupted. The glass body contains a fusible element that tolerates brief current spikes without melting, then blows cleanly when sustained overload exceeds the 10A rating.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses suit motors, transformers, switch-mode power supplies and other inductive loads that draw a high inrush current on startup before settling to a lower running current. A fast-blow fuse would trip unnecessarily on startup; a slow blow fuse allows the surge, then protects the circuit during continuous operation. The 5 x 20mm cartridge fits standard panel-mount and PCB-mount fuse holders, and is a common replacement size in audio amplifiers, lighting control circuits and low-voltage power distribution boards.\u003c\/p\u003e\n\u003cp\u003eThe fuse is manufactured to IEC standards, ensuring consistent blow characteristics and predictable performance under fault conditions. Each fuse is marked with the T10A rating on the metal end caps, allowing quick identification when replacing. The transparent glass body allows visual inspection of the fusible element to confirm whether the fuse has blown.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does \"slow blow\" mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (also called time-delay) means the fuse tolerates brief current surges above its rating without blowing. This suits circuits where inrush current on startup is normal, such as motors or transformers. A sustained overload above 10A will still blow the fuse within seconds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage is it rated for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fuse is rated at 250V. It can be used in circuits up to 250V AC or DC, including standard UK 230V mains-fed equipment and lower-voltage distribution circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my fuse holder?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm cartridge is a standard size that fits most panel-mount and PCB-mount fuse holders rated for this dimension. Measure your existing fuse to confirm it's 5mm diameter and 20mm long.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many fuses are in the pack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePack quantity depends on the SKU variant. Check the product title or specification table for the exact quantity supplied.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486815499,"sku":"787.020UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787020UK_LB1_acdd3491-4e7f-44bc-9962-86647ce2bf32.jpg?v=1715194156"},{"product_id":"mercury-5-x-20mm-t12a-slow-blow-fuses-250v","title":"Mercury 5 x 20mm T12A Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T12A is a 12-amp slow blow fuse in a 5 x 20mm glass cartridge format, rated for 250V AC circuits. The slow blow (time-delay) characteristic allows the fuse to tolerate short-term current surges from motor startup, transformer inrush or capacitive loads without breaking the circuit, while still opening rapidly on sustained overloads above the rated 12A.\u003c\/p\u003e\n\u003cp\u003eDesigned for use in audio amplifiers, PA systems, powered speakers, mains-powered lighting equipment and general electronic devices where inrush current can briefly exceed the steady-state operating current. The 5 x 20mm cartridge size is a standard European format found in IEC-compliant mains input modules, inline fuse holders and equipment back panels. Each fuse uses nickel-plated brass end caps and a sand-filled glass tube for arc suppression when the element breaks.\u003c\/p\u003e\n\u003cp\u003eThe T12A rating means the fuse will hold 12A continuously at ambient temperature and will open within a defined time window on overcurrent events. The delay characteristic is calibrated to tolerate typical startup transients that last 10-50 milliseconds without nuisance tripping. IEC compliant construction ensures compatibility with standard fuse clips and holders across equipment from different manufacturers.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does \"slow blow\" mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (or time-delay) fuses tolerate brief current surges above the rated amperage without breaking, but still open on sustained overloads. This prevents nuisance tripping from motor startup, transformer inrush or capacitor charging transients.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this suitable for 240V UK mains?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating covers UK mains voltage (230V nominal) with headroom for voltage variation. The fuse is designed for use in IEC mains input modules and equipment back panels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many fuses are in the pack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePack quantity is not specified in the product data. Contact us to confirm pack size before ordering if you need a specific quantity for a project or installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a fast-blow fuse with this slow blow type?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly if the equipment manufacturer specifies a slow blow fuse is acceptable. Replacing a fast-blow with a slow-blow reduces overcurrent protection speed and may allow fault conditions to persist longer than the circuit design intended.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486848267,"sku":"787.021UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787021UK_LB1_7b7573c9-c310-4ff1-9d61-4db0441c5658.jpg?v=1715194159"},{"product_id":"mercury-5-x-20mm-t16a-slow-blow-fuse-250v-time-delay","title":"Mercury 5 x 20mm T16A Slow Blow Fuse - 250V Time Delay","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T16A is a 5 x 20mm glass-body cartridge fuse rated at 16 amps and 250 volts, built with time-delay (slow blow) construction to tolerate inrush currents without nuisance tripping. The delay-action element allows brief surges during equipment start-up or motor activation to pass without blowing, while still interrupting sustained overcurrent faults within milliseconds.\u003c\/p\u003e\n\u003cp\u003eDesigned for protection in audio equipment, power supplies, amplifiers, motors and control circuits where brief high-current surges occur during normal operation, the T16A suits both industrial and consumer electronics. The standard 5 x 20mm form factor fits most European-spec fuse holders and PCB-mount clips. The glass tube body allows visual inspection of the fuse element without removal.\u003c\/p\u003e\n\u003cp\u003eThe fuse carries IEC approval and meets the dimensional and electrical requirements for 5 x 20mm F-rated (fast-acting) and T-rated (time-delay) cartridge fuses. The nickel-plated brass end caps provide reliable contact in standard fuse holders. Each fuse weighs approximately 0.6g and the glass envelope is sand-filled to suppress arc propagation during fault interruption.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (time-delay) fuses tolerate brief inrush currents during equipment start-up without blowing, making them suitable for motors, transformers and power supplies. Fast blow fuses interrupt overcurrent faults immediately and are used where inrush surges do not occur.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this fuse suitable for mains voltage equipment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating covers UK mains voltage (230V) with overhead. However, the 16A rating is higher than typical domestic fuse ratings. Verify that 16A is the correct rating for your equipment before fitting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace a fast-blow fuse of the same rating?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot always. Using a slow blow fuse where a fast blow is specified reduces protection speed and may allow damage to occur during fault conditions. Only substitute where the equipment manufacturer specifies a time-delay fuse or where inrush currents cause nuisance blowing with fast-blow fuses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the fuse inspected for failure?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection. A blown fuse typically shows a broken element and blackening or metallic deposits on the inside of the glass. For confirmation, use a continuity tester or multimeter set to resistance mode.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486913803,"sku":"787.022UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787022UK_LB1_8e59c7c8-d0fa-4fe6-abb4-c7649c11942f.jpg?v=1715194162"},{"product_id":"6-x-32mm-t160ma-slow-blow-fuse-250v-glass-tube","title":"6 x 32mm T160mA Slow Blow Fuse - 250V Glass Tube","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThis 6 x 32mm T160mA slow blow fuse is a glass tube delay-action fuse rated at 160mA on 250V circuits. The slow blow characteristic allows temporary inrush currents and start-up surges to pass without blowing the fuse, while still protecting against sustained overcurrent. The glass tube construction makes the internal wire filament visible, allowing quick inspection of fuse condition without removing it from the holder.\u003c\/p\u003e\n\u003cp\u003eDesigned for low-current applications in audio equipment, lighting control circuits, small transformers, control panels and instrumentation where inrush currents at power-on would cause a standard fast-acting fuse to fail prematurely. The 6 x 32mm format fits standard ceramic and panel-mount fuse holders common in European equipment. The 160mA rating suits circuits drawing between 100-140mA continuous load with occasional peaks up to 300-400mA during transient events.\u003c\/p\u003e\n\u003cp\u003eThe fuse meets IEC 60127 standards for miniature fuses, ensuring consistent breaking capacity and operating characteristics across different batches. The nickel-plated brass endcaps provide corrosion resistance and reliable contact with fuse holder terminals. The delay-action response is achieved through a coiled wire filament with a thermal mass that takes several seconds to heat to breaking point under moderate overcurrent conditions, compared to the instant response of a fast-acting fuse.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (also called time-delay or T-rated) means the fuse tolerates brief overcurrent surges without blowing, typically allowing 2-10 seconds at 200% rated current before breaking. This prevents nuisance blowing during equipment start-up or motor inrush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size fuse holder does it need?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAny standard 6 x 32mm fuse holder will accept this fuse. Common types include panel-mount ceramic holders, PCB-mount clips and inline cable holders. Check that the holder is rated for at least 250V.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I substitute a higher-rated fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Using a higher-rated fuse (e.g. 315mA or 500mA) removes the overcurrent protection the circuit was designed for and can result in component damage or fire risk. Always replace with the same rating specified by the equipment manufacturer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I tell if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass tube construction allows visual inspection. A blown fuse will show a broken or discoloured wire filament inside the tube, often with a dark carbon deposit on the glass. An intact fuse shows a continuous wire running between the two endcaps.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313486979339,"sku":"787.131UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787131UK_0.jpg?v=1784900181"},{"product_id":"6-x-32mm-t315ma-slow-blow-fuse-250v-iec-compliant","title":"6 x 32mm T315mA Slow Blow Fuse - 250V IEC Compliant","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThis 6 x 32mm slow blow fuse is rated at 315mA (T315mA) on 250V and provides time-delay protection for circuits carrying sensitive electronics. The slow blow characteristic allows brief inrush currents during power-on or motor start without blowing, while still protecting against sustained overcurrent or short circuit faults.\u003c\/p\u003e\n\u003cp\u003eDesigned for use in audio amplifiers, power supplies, instrument amplifiers, lighting control circuits and other equipment where inrush tolerance is needed, the fuse fits standard 6mm diameter fuse clips and holders. The glass tube body allows visual inspection of the fuse wire to confirm whether the fuse has blown without removing it from the circuit.\u003c\/p\u003e\n\u003cp\u003eThe fuse meets IEC standards for construction and breaking capacity, ensuring reliable operation across the 250V voltage range. Each fuse measures 32mm in length including the nickel-plated end caps. The time-delay rating means the fuse can handle short-duration overcurrent events up to several times the rated current without nuisance blowing, making it suitable for equipment with capacitive or inductive loads that draw higher current at switch-on.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does slow blow mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (time-delay) fuses allow brief overcurrent surges without blowing, protecting against sustained faults while tolerating normal inrush currents when equipment powers on. This prevents nuisance blowing in circuits with motors, transformers or capacitive loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the breaking capacity?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIEC-compliant fuses of this type typically carry a breaking capacity of 35A or higher at 250V, meaning they can safely interrupt fault currents up to that level without rupturing the glass tube or causing arcing damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace a fast-blow fuse of the same rating?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Fast-blow and slow-blow fuses serve different purposes. Replacing a fast-blow fuse with a slow-blow type may leave the circuit under-protected, as the slow-blow fuse will tolerate higher overcurrent for longer before interrupting the circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 315mA fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e315mA fuses are common in low-power audio equipment, signal processors, small power supplies, LED drivers and control circuits where the normal operating current is well below 315mA but brief inrush currents occur at power-on.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487110411,"sku":"787.133UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787133UK_0.jpg?v=1784900191"},{"product_id":"mercury-6-x-32mm-t500ma-slow-blow-fuses-250v","title":"Mercury 6 x 32mm T500mA Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T500mA is a 6 x 32mm glass tube slow blow fuse rated to 250V, designed to protect low-current circuits while tolerating brief inrush current spikes that occur when devices power on. The time-delay element inside the glass tube allows short-duration surges to pass without blowing the fuse, then interrupts the circuit if sustained overcurrent continues beyond the 500mA rating.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses are commonly used in power supplies, audio equipment, lighting control circuits, battery chargers and any application where motors, transformers or capacitors create momentary inrush current during startup. The 6 x 32mm format fits standard ceramic or inline fuse holders used in mains-powered equipment and low-voltage distribution boards. The 250V rating covers both UK 230V mains and lower-voltage DC applications up to 250V.\u003c\/p\u003e\n\u003cp\u003eThe glass tube construction allows visual inspection of the internal wire element. A blown fuse shows a visible break in the wire or discolouration of the glass. Each fuse carries the T500mA rating printed on the metal end cap for identification during replacement. These fuses meet IEC standards for time-delay fuses and are sold in packs suitable for workshop stock or field service use.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow fuse has a time-delay element that allows brief current surges (such as motor startup or capacitor charging) to pass without blowing. If the overcurrent persists beyond the rated 500mA, the fuse then interrupts the circuit. This contrasts with fast-acting fuses that blow immediately when current exceeds the rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between T500mA and F500mA?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eT-rated fuses are time-delay (slow blow). F-rated fuses are fast-acting and blow immediately when the rated current is exceeded. Use T-rated fuses in circuits with inrush current; use F-rated fuses in circuits requiring immediate protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 6 x 32mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis format is common in audio amplifiers, power supplies, battery chargers, lighting control gear, and low-voltage distribution boards. Check your equipment's fuse holder or manual to confirm the required size and rating before replacing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used in DC circuits?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating applies to both AC mains (230V) and DC circuits up to 250V. The fuse interrupts current in the same way regardless of whether the voltage is AC or DC.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487175947,"sku":"787.134UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787134UK_0.jpg?v=1784900202"},{"product_id":"mercury-6-x-32mm-t630ma-slow-blow-fuses-pack-of-10","title":"Mercury 6 x 32mm T630mA Slow Blow Fuses - Pack of 10","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T630mA is a 6 x 32mm glass cartridge fuse rated at 630 milliamps (0.63A) on 250V circuits, with a time-delay slow-blow characteristic that allows temporary overcurrent surges to pass without blowing. The glass tube construction shows a visible wire element that melts when current exceeds the rating for a sustained period, providing clear indication when the fuse has failed.\u003c\/p\u003e\n\u003cp\u003eDesigned for low-current electronics, control panels, audio equipment, and sensitive circuit boards where startup inrush currents are higher than running current, the time-delay action prevents nuisance blowing during switch-on while still protecting against sustained overload or short circuits. The 6 x 32mm dimension is a common European standard size that fits fuse holders in many imported appliances, testing equipment, and industrial control gear.\u003c\/p\u003e\n\u003cp\u003eThe nickel-plated brass caps provide reliable contact and corrosion resistance in dusty environments. IEC compliance confirms the fuse meets international manufacturing and performance standards for consistent breaking capacity. The 250V rating covers both 230V mains circuits and lower-voltage DC applications where a time-delay fuse is specified.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does T630mA mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe T prefix indicates a time-delay (slow-blow) characteristic, meaning the fuse tolerates brief overcurrent surges without blowing. The 630mA rating is the maximum continuous current the fuse will carry indefinitely. Prolonged current above this melts the element.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does a slow-blow fuse differ from a fast-blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow-blow fuses have a thicker element or coiled spring design that absorbs brief current spikes without melting, making them suited to circuits with motors, transformers or capacitors that draw higher current during startup. Fast-blow fuses melt almost instantly when current exceeds the rating, protecting sensitive semiconductor circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size fuse holder does this fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 6 x 32mm size is a standard European cartridge fuse dimension. It fits panel-mount or PCB-mount fuse holders marked 6.3 x 32mm or 1\/4 x 1-1\/4 inch (the imperial equivalent). Check the existing fuse before ordering to confirm dimension.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this be used in 12V or 24V DC circuits?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating is the maximum voltage, so the fuse can be used safely on any DC or AC circuit up to 250V where a 630mA time-delay fuse is specified. Lower-voltage circuits simply present less stress to the fuse element.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487208715,"sku":"787.135UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787135UK_0.jpg?v=1784900212"},{"product_id":"mercury-6-x-32mm-t1-25a-slow-blow-fuses-250v-iec","title":"Mercury 6 x 32mm T1.25A Slow Blow Fuses - 250V IEC","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury 6 x 32mm T1.25A slow blow fuse is a time-delay glass-body fuse rated for 1.25A at 250V, designed to handle brief startup current surges without blowing. The slow blow (T-rated) element tolerates transient overloads of 2-3 times the rated current for short periods, making it suitable for protecting audio equipment, power supplies and other devices with inductive loads or high inrush currents on switch-on.\u003c\/p\u003e\n\u003cp\u003eCommonly used in amplifiers, mixing desks, PA equipment, DJ controllers and mains-powered audio devices where the startup current briefly exceeds the running current, the 6 x 32mm form factor fits standard panel-mount fuse holders and PCB-mount clips. The glass body allows visual inspection of the fuse element to confirm whether it has blown without needing a multimeter.\u003c\/p\u003e\n\u003cp\u003eThe fuse carries IEC approval, confirming it meets international safety standards for fuse breaking capacity and voltage rating. The 6 x 32mm dimension refers to the body diameter and overall length including the metal caps at each end, which is a standard size in European and Asian equipment but less common than the 5 x 20mm size in UK domestic appliances.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow fuse (also called time-delay or T-rated) is designed to tolerate brief overcurrent surges without blowing, typically 2-3 times the rated current for a few seconds. This prevents nuisance blowing when equipment with motors, transformers or capacitors draws high current on startup before settling to normal running current.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 6 x 32mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAudio equipment (amplifiers, mixing desks, powered speakers), DJ controllers, power supplies, lighting controllers and some imported electronic devices use this size. It is less common in UK domestic appliances, which typically use 5 x 20mm or BS1362 cartridge fuses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a fast-blow fuse instead?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot if the equipment specifies a slow blow fuse. Fast-blow fuses will blow on the startup surge and need frequent replacement. Always replace with the same fuse type and rating specified by the equipment manufacturer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows you to see the fuse element inside. If the thin metal wire is intact and continuous, the fuse is good. If the wire is broken or shows a black scorch mark, the fuse has blown and needs replacing.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487405323,"sku":"787.138UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787138UK_0.jpg?v=1784900222"},{"product_id":"mercury-6-x-32mm-t1-6a-slow-blow-fuses-250v-iec-compliant","title":"Mercury 6 x 32mm T1.6A Slow Blow Fuses - 250V IEC Compliant","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T1.6A is a 6 x 32mm glass cartridge fuse rated at 1.6A and 250V, designed with a time-delay element that allows brief inrush currents to pass without blowing. This slow blow characteristic protects low-current circuits containing motors, transformers, capacitors or filament lamps, where the initial power-on surge can be several times higher than the steady-state operating current.\u003c\/p\u003e\n\u003cp\u003eThese fuses suit audio amplifiers, power supplies, control panels, automotive accessories, and vintage equipment where the original fuse holder takes a 6 x 32mm cartridge. The time-delay element tolerates short-duration overloads while still protecting the circuit from sustained overcurrent faults. The glass body allows visual inspection of the internal element without removing the fuse from the holder.\u003c\/p\u003e\n\u003cp\u003eThe fuse conforms to IEC standards for physical dimensions, breaking capacity and time-delay characteristics, ensuring consistent performance across batches. The nickel-plated brass end caps provide reliable contact in ceramic, panel-mount and inline fuse holders. At 1.6A rating, these fuses sit between the more common 1A and 2A sizes, making them useful for circuits where a 1A blows too readily and a 2A provides insufficient protection.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'slow blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow fuse has a time-delay element that tolerates brief overcurrent surges without blowing. This is critical for devices with inrush currents at power-on. Motors, transformers, and filament lamps often draw several times their rated current for the first few milliseconds. A fast-acting fuse would blow immediately; a slow blow fuse allows the surge to pass and only opens if the overcurrent continues.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 6 x 32mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis size is common in vintage audio equipment, guitar amplifiers, power supply modules, automotive accessories, and industrial control panels. It's less common than the larger 5 x 20mm or 6 x 30mm sizes in modern domestic equipment, but still widely used in specialist and legacy applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a fast-acting fuse with a slow blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot as a blanket rule. If the original equipment specified a slow blow fuse, replacing it with a fast-acting type will cause nuisance blowing. Going the other direction. Replacing a fast-acting fuse with a slow blow. Reduces protection and may allow damaging overcurrents to persist longer than the circuit was designed to tolerate. Always match the fuse type and rating to the manufacturer's specification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow can I tell if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection. A blown fuse typically shows a broken or melted internal wire element, and in some cases a darkened or discoloured glass interior from the arc. If the element appears intact but the circuit still has no power, test the fuse with a multimeter set to continuity mode.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487470859,"sku":"787.139UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787139UK_0.jpg?v=1784900232"},{"product_id":"mercury-6-x-32mm-t2a-slow-blow-fuses-250v-time-delay","title":"Mercury 6 x 32mm T2A Slow Blow Fuses - 250V Time Delay","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T2A is a 6 x 32mm slow blow fuse rated at 2A and 250V, designed to tolerate brief inrush current surges before blowing under sustained overload conditions. The time-delay element inside the glass tube allows the fuse to ride out momentary power spikes from motors starting, transformers energising, or capacitors charging, while still protecting the circuit from prolonged overcurrent faults.\u003c\/p\u003e\n\u003cp\u003eThese fuses are used in audio amplifiers, low-voltage lighting transformers, CCTV power supplies, and electronic equipment where switching on draws a higher current than continuous operation. The 6 x 32mm cartridge format is a standard size for fuse holders in UK and European equipment, fitting ceramic or panel-mount holders that accept this dimension. The glass body allows visual inspection of the internal element without removing the fuse from the holder.\u003c\/p\u003e\n\u003cp\u003eThe IEC approval confirms compliance with international standards for fuse construction and performance. Each fuse is marked with the rating and breaking capacity on the metal end cap. The slow blow characteristic means the fuse takes longer to blow than a fast-acting equivalent at the same current rating, reducing nuisance blowing during equipment startup.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast-acting fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses tolerate brief current surges above their rated value before blowing, allowing equipment with inrush current to start without nuisance fuse failure. Fast-acting fuses blow almost immediately when current exceeds the rating, giving tighter protection for sensitive electronics with no inrush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage rating does this carry?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Mercury T2A is rated at 250V. This is the maximum voltage the fuse can safely interrupt when it blows under fault conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit standard 6 x 32mm fuse holders?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 6 x 32mm dimension is a standard cartridge fuse size and fits ceramic panel-mount holders, inline holders, and PCB-mount clips designed for this format.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I check if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows you to see the internal wire element. If the wire is broken or the glass is blackened inside, the fuse has blown. For certainty, test with a multimeter on continuity mode across the two end caps.\u003c\/p\u003e\n","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487503627,"sku":"787.140UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787140UK_0.jpg?v=1784900242"},{"product_id":"mercury-6-x-32mm-t3-15a-slow-blow-fuses-glass-tube-pack-of-10","title":"Mercury 6 x 32mm T3.15A Slow Blow Fuses - Glass Tube (Pack of 10)","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T3.15A is a 6 x 32mm slow blow glass fuse with nickel-plated brass end caps, rated at 3.15A and 250V. The slow blow (time-delay) design allows short inrush currents during equipment start-up without blowing the fuse, while still providing overcurrent protection if a sustained fault develops.\u003c\/p\u003e\n\u003cp\u003eDesigned for low-current circuits in audio equipment, lighting controllers, small appliances and electronic devices where motors, transformers or capacitive loads create momentary current spikes on power-up. The 6 x 32mm form factor fits standard fuse holders used across consumer electronics, automotive applications and industrial control panels. The glass tube allows visual inspection of the fuse element to confirm whether the fuse has blown.\u003c\/p\u003e\n\u003cp\u003eEach fuse is IEC approved and carries nickel-plated brass end caps that resist corrosion and maintain consistent contact pressure in the holder. The slow blow characteristic typically tolerates inrush currents up to 10x the rated 3.15A for short periods (measured in milliseconds), making it suitable for circuits where nuisance blowing with fast-acting fuses is a recurring problem.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast-acting fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (time-delay) fuses tolerate short current surges without breaking the circuit, making them suitable for equipment with motors or transformers that draw higher current on start-up. Fast-acting fuses blow immediately when the rated current is exceeded, providing faster protection for sensitive electronics but less tolerance for inrush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage rating does the fuse carry?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe T3.15A is rated at 250V. This is the maximum voltage the fuse can safely interrupt if a fault occurs. Using it in circuits above 250V risks arc-over and failure to interrupt the fault.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many fuses are in a pack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMercury 6 x 32mm fuses are typically supplied in packs of 10. Confirm the pack quantity in the product specification or on the packaging when the item arrives.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this fuse in a car?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 6 x 32mm glass fuse is a common automotive fuse size and the 250V rating exceeds typical 12V or 24V automotive systems. However, confirm the amperage requirement of the circuit before fitting. A 3.15A fuse is only suitable for low-draw circuits like interior lights or control modules.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487601931,"sku":"787.142UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787142UK_0.jpg?v=1784900254"},{"product_id":"mercury-6-x-32mm-t4a-slow-blow-fuses-250v","title":"Mercury 6 x 32mm T4A Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T4A is a 6 x 32mm slow blow (time-delay) glass tube fuse rated at 4A and 250V, designed to withstand brief inrush currents before blowing. The slow blow characteristic allows the fuse to ride out the initial current surge when motors, transformers or capacitors power on, then provide overcurrent protection during normal operation.\u003c\/p\u003e\n\u003cp\u003eFitted in small domestic appliances, AV amplifiers, test equipment and control panels where switch-on current spikes would trip a fast-acting fuse prematurely, the T4A uses a coiled wire element inside a glass tube with nickel-plated brass end caps. The wire coil absorbs thermal energy during transient overloads before melting under sustained overcurrent, giving protection without nuisance tripping.\u003c\/p\u003e\n\u003cp\u003eThe 6 x 32mm dimension is an IEC standard size, allowing the fuse to fit into panel-mount fuseholders, PCB clips and inline holders rated for this form factor. The glass tube construction allows visual inspection of the element after a fault. A broken wire with scorch marks indicates a genuine overload, while a clean break suggests mechanical failure or installation error.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does slow blow mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (also called time-delay) means the fuse can withstand brief current surges above its 4A rating without blowing, typically handling 10-20A for 1-2 seconds during motor or transformer start-up. Under sustained overcurrent the element heats and melts, breaking the circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast-acting fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFast-acting fuses blow immediately when current exceeds their rating, making them suitable for resistive loads that draw steady current. Slow blow fuses tolerate short-duration surges, making them better for inductive loads (motors, transformers) that draw high current on switch-on.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a 5A fuse instead?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly if the device manufacturer specifies a 5A rating. Using a higher-rated fuse can allow sustained overcurrent to damage the equipment or create a fire hazard. Always replace fuses with the same rating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these sold individually or in packs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the product specifications. Fuses are typically sold in packs of 5, 10 or 100 depending on the SKU.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487667467,"sku":"787.143UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787143UK_0.jpg?v=1784900265"},{"product_id":"mercury-6-x-32mm-t5a-slow-blow-fuses-250v-glass-pack-of-10","title":"Mercury 6 x 32mm T5A Slow Blow Fuses - 250V Glass (Pack of 10)","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T5A is a 6 x 32mm slow blow glass fuse rated at 5A and 250V, designed to protect electrical equipment that draws high inrush current during start-up without nuisance tripping. The time-delay element allows temporary current spikes to pass harmlessly while still breaking the circuit if a sustained overload or short circuit occurs.\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses suit motors, transformers, amplifiers, projectors and other inductive loads where the initial power-on surge can briefly exceed the rated current before settling to normal operating levels. A fast-acting fuse would blow immediately on these spikes, requiring constant replacement. The T5A's time-delay filament absorbs short-duration surges and only breaks when the overload is sustained beyond safe limits.\u003c\/p\u003e\n\u003cp\u003eThe 6 x 32mm glass tube format is a standard size for panel-mount fuse holders, inline fuse carriers and equipment internal fuse clips. The glass construction allows visual inspection of the filament to confirm whether the fuse has blown. Each fuse is rated to IEC standards for consistent breaking capacity and meets the T (time-delay) designation for slow blow characteristics. Supplied in packs of 10.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast acting fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFast-acting fuses break immediately when current exceeds the rated value. Slow blow fuses tolerate brief current spikes (typically lasting milliseconds to a few seconds) before breaking, making them suitable for equipment with high start-up current like motors and transformers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a fast-acting fuse with a slow blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly if the equipment manufacturer specifies a time-delay fuse. Using a slow blow fuse where a fast-acting type is required can allow dangerous overloads to persist longer than the circuit is designed to handle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow can I tell if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection. A blown fuse will have a visibly broken filament wire inside the tube, often with black or brown discolouration on the glass if the break was caused by a sustained overload.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does T5A mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eT designates time-delay (slow blow) characteristics per IEC standards. 5A is the rated current. The fuse will carry 5A continuously without breaking, but will blow if sustained overload occurs.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487700235,"sku":"787.144UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787144UK_0.jpg?v=1784900276"},{"product_id":"mercury-6-x-32mm-t6-3a-slow-blow-fuses-250v","title":"Mercury 6 x 32mm T6.3A Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T6.3A is a 6 x 32mm slow blow fuse rated to 250V, designed to tolerate brief current surges without blowing. The delay-action element allows inrush currents from motors, transformers and capacitive loads to settle before the fuse decides whether to interrupt the circuit, reducing nuisance blowing in equipment with high startup currents.\u003c\/p\u003e\n\u003cp\u003eDesigned for audio amplifiers, PA equipment, power supplies and control panels where motor-driven or transformer-fed circuits generate brief current spikes on power-up, the slow blow design gives the fuse a few milliseconds to distinguish between a genuine overcurrent fault and a short-lived inrush. The 6 x 32mm cartridge format fits standard PCB-mount and panel-mount fuse holders used across consumer electronics, professional audio and industrial control equipment.\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection of the fuse element to confirm whether the fuse has blown, while the nickel-plated brass endcaps provide consistent contact in spring-clip fuse holders. IEC compliance ensures the fuse meets international electrical safety standards for use in equipment sold across Europe and the UK.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between slow blow and fast blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses tolerate brief current surges (typically a few milliseconds) before interrupting the circuit, making them suitable for equipment with high startup currents such as motors and transformers. Fast blow fuses respond immediately to overcurrent and are used where load currents remain steady and any surge indicates a fault.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage rating does this fuse carry?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe T6.3A is rated to 250V. It can be used in lower-voltage circuits (e.g. 12V, 24V, 110V) but should not be used in circuits exceeding 250V.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many fuses are included?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the product Specification or packaging details for the quantity per pack. Mercury fuses are typically sold in packs of 5 or 10.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this fuse IEC compliant?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The fuse meets IEC standards for electrical safety, making it suitable for use in equipment requiring international certification.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487733003,"sku":"787.145UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787145UK_0.jpg?v=1784900286"},{"product_id":"mercury-6-x-32mm-t8a-slow-blow-fuses-250v-iec-compliant","title":"Mercury 6 x 32mm T8A Slow Blow Fuses - 250V IEC Compliant","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThese Mercury 6 x 32mm slow blow fuses carry an 8A rating with a 250V voltage threshold and a time-delay response that tolerates brief current peaks without blowing. The slow blow characteristic allows appliances with inductive loads or high surge currents at startup to draw their initial peak before the fuse reacts, protecting the circuit from sustained overloads while avoiding nuisance trips during normal operation.\u003c\/p\u003e\n\u003cp\u003eDesigned for use in appliances with motors, transformers, and power supplies where startup current can exceed the steady-state running current, the fuses comply with IEC standards for dimensional accuracy and breaking capacity. The 6 x 32mm glass tube body with nickel-plated brass end caps fits standard fuseholders in AV equipment, amplifiers, battery chargers, and small appliance circuits rated at 250V or below.\u003c\/p\u003e\n\u003cp\u003eThe transparent glass body allows visual confirmation of the fuse element condition. A broken element or discolouration of the glass indicates the fuse has blown. The time-delay element inside the tube is rated to withstand momentary current peaks up to several times the nominal 8A rating for short durations before interrupting the circuit, making it well-suited to circuits where brief surges are expected as part of normal operation.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between slow blow and fast blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA slow blow fuse has a time-delay element that allows brief current peaks without blowing, making it suitable for appliances with high surge currents at startup. A fast blow fuse reacts immediately to any current above its rated threshold, making it better for protecting sensitive electronics that cannot tolerate overloads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat applications are these fuses used in?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTypical applications include AV amplifiers, PA systems, battery chargers, power supplies, motors and transformers where the startup current exceeds the steady-state running current. The 8A rating suits circuits drawing up to around 2,000W on 250V mains.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these fuses IEC compliant?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The fuses comply with IEC standards for dimensional accuracy and breaking capacity, ensuring they fit standard 6 x 32mm fuseholders and provide consistent performance across different appliances and installations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow can I tell if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe transparent glass body allows you to see the internal fuse element. A broken element or blackened glass indicates the fuse has blown and needs replacing.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487765771,"sku":"787.146UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787146UK_0.jpg?v=1784900297"},{"product_id":"mercury-6-x-32mm-t10a-slow-blow-fuses-250v-glass-time-delay","title":"Mercury 6 x 32mm T10A Slow Blow Fuses - 250V Glass Time-Delay","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T10A is a 6 x 32mm slow blow glass fuse rated at 10A and 250V, designed for equipment with inductive loads or motors that draw high start-up currents before settling to a lower running current. The time-delay element inside the glass tube allows brief current surges during motor start-up or capacitor charging without blowing, while still providing overcurrent protection once the surge period has passed.\u003c\/p\u003e\n\u003cp\u003eThese fuses suit applications such as audio amplifiers, motor-driven appliances, power supplies with large transformers, and lighting control equipment where the initial inrush current can be several times higher than the steady-state running current. The glass body allows visual inspection of the element after a fault to confirm whether the fuse has blown. The 6 x 32mm format is a standard cartridge size compatible with fuse holders commonly found in UK and European equipment.\u003c\/p\u003e\n\u003cp\u003eThe T10A rating denotes a 10-amp breaking capacity with a time-delay characteristic, meaning the fuse tolerates short-duration overcurrent conditions without interrupting the circuit. The fuses are manufactured to IEC 60127 standards, ensuring consistent performance and compatibility with equipment specifying IEC-compliant fuses. Each fuse has nickel-plated brass end caps for reliable contact in the fuse holder and corrosion resistance over the service life.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between slow blow and fast blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow (time-delay) fuses allow brief current surges without blowing, making them suitable for motors and transformers that draw high inrush currents on start-up. Fast blow fuses interrupt the circuit immediately when the rated current is exceeded, providing protection for sensitive electronics that cannot tolerate even short overcurrent conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage rating do these fuses carry?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThese fuses are rated at 250V. They can be used in circuits with lower voltages, but should not be installed in equipment operating above 250V.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if a fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection. A blown fuse typically shows a broken wire element inside the tube, and the glass may be darkened or blackened from the arc that occurred when the element melted. If the element appears intact and continuous, the fuse is likely still functional.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these fuses suitable for automotive use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. These are designed for mains-voltage equipment operating at 230V AC. Automotive fuses use different form factors (blade fuses, mini\/maxi fuses) and are rated for 12V or 24V DC circuits.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487798539,"sku":"787.147UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787147UK_0.jpg?v=1784900306"},{"product_id":"mercury-6-x-32mm-t12a-slow-blow-fuses-250v","title":"Mercury 6 x 32mm T12A Slow Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury T12A is a 6 x 32mm slow blow fuse rated at 12 amps and 250 volts, designed to tolerate short-term power surges without breaking the circuit. The slow blow characteristic delays the fuse response during momentary overloads, making it suitable for motors, transformers, power supplies and other inductive loads that draw higher current during startup than during normal running.\u003c\/p\u003e\n\u003cp\u003eThese fuses are commonly used in audio equipment, PA systems, broadcast installations and industrial control panels where equipment startup generates a brief inrush current that would trip a fast-acting fuse. The 6 x 32mm glass cartridge format fits standard fuse holders in mains plugs, equipment chassis panels and distribution boards across the UK and Europe. IEC certification confirms the fuse meets international safety standards for rated breaking capacity.\u003c\/p\u003e\n\u003cp\u003eThe transparent glass body allows visual inspection of the fuse element without removal from the holder. Once a fuse has blown, the internal wire will appear broken or discoloured. The nickel-plated brass end caps ensure good contact in the fuse holder and resist corrosion. Each fuse is stamped with the T12A rating on the end cap for identification during replacement.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSlow Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does slow blow mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSlow blow fuses tolerate brief current surges above the rated amperage without blowing, giving inductive loads time to complete their startup cycle. A fast-acting fuse of the same rating would blow during the same surge. This makes slow blow fuses necessary for motors, transformers and similar equipment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere is this fuse typically used?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 6 x 32mm T12A is a standard size in audio equipment, PA amplifiers, powered speakers, broadcast gear and industrial control panels. It fits the same holders as F-rated (fast-acting) fuses of the same physical size, so replacement requires matching both the amperage and the time delay characteristic.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace a fast-acting 12A fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePhysically it will fit, but substituting a slow blow for a fast-acting fuse removes an important safety margin. Fast-acting fuses are specified where immediate circuit breaking is required. Only replace with a slow blow fuse if the equipment manufacturer specifies a T-rated or time-delay fuse in that position.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know when the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe internal wire element will appear broken or heavily discoloured when viewed through the glass body. If the element looks intact and silver-grey, the fuse is likely still functional. A multimeter set to continuity mode will confirm whether the fuse is open or closed circuit.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313487995147,"sku":"787.148UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787148UK_0.jpg?v=1784900318"},{"product_id":"mercury-5-x-20mm-f100ma-quick-blow-glass-fuse-250v","title":"Mercury 5 x 20mm F100mA Quick Blow Glass Fuse - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F100mA is a 5 x 20mm glass cartridge fuse rated at 100 milliamps and 250V, designed for fast-acting circuit protection in low-current applications. The quick blow construction disconnects the circuit within milliseconds of the current exceeding 100mA, protecting sensitive components in audio equipment, control circuits, and instrumentation before damage can occur.\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses differ from slow blow or time-delay types by offering no tolerance for current surges. The internal wire melts immediately when the rated current is exceeded. This makes the F100mA suitable for circuits where components cannot withstand even brief overcurrent conditions, such as pre-amplifier stages, microphone phantom power lines, MIDI interfaces, and low-voltage control boards. The 5 x 20mm cartridge format fits standard panel-mount and PCB-mount fuseholders across AVSL, Adastra and Citronic audio products.\u003c\/p\u003e\n\u003cp\u003eThe glass tube construction allows visual inspection of the internal fuse element to confirm whether the fuse has blown without needing a continuity tester. The nickel-plated brass end caps provide reliable contact and resist corrosion in installations where the equipment may be stored or used in variable humidity. Each fuse is IEC-compliant and manufactured to standard tolerances for drop-in replacement in existing equipment.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between quick blow and slow blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses disconnect the circuit immediately when the rated current is exceeded, offering no tolerance for brief surges. Slow blow (time-delay) fuses allow temporary current spikes without blowing, making them suitable for motors and transformers that draw higher current on startup. The F100mA quick blow is designed for circuits that cannot tolerate any overcurrent condition.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment typically uses a 100mA fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe F100mA rating is common in pre-amplifiers, microphone phantom power circuits, small signal processors, MIDI interfaces, LED control circuits, and other low-power audio or control equipment where the operating current is well below 100mA and higher currents indicate a fault.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this fuse in mains voltage equipment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 250V rating covers UK mains voltage (230V), but the 100mA current rating is far too low for mains appliances. This fuse is intended for low-current secondary circuits within equipment, not primary mains protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass tube allows you to see the internal fuse wire. If the wire is intact and continuous, the fuse is good. If the wire is broken or you see a dark deposit on the inside of the glass, the fuse has blown and needs replacing.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488126219,"sku":"787.250UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787250UK_LB1_bda0bd20-d356-47a4-a9f7-0ded6500de5c.jpg?v=1715194223"},{"product_id":"mercury-5-x-20mm-f200ma-quick-blow-fuse-250v","title":"Mercury 5 x 20mm F200mA Quick Blow Fuse - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F200mA is a 5 x 20mm quick blow glass fuse rated to 200mA at 250V, designed for fast-acting overcurrent protection in sensitive electronic circuits. The glass body houses a thin metal filament that melts immediately when current exceeds the rated 200mA threshold, interrupting the circuit before components downstream can be damaged.\u003c\/p\u003e\n\u003cp\u003eUsed in precision electronics, audio equipment, test instruments, and control boards where rapid fault interruption is critical to protect semiconductor components and ICs. The 5 x 20mm format is a standard fuse size across European and international equipment, fitting inline fuse holders, panel-mount blocks, and PCB-mounted clips. The quick blow (fast-acting) characteristic means the fuse does not tolerate inrush current or brief surges, making it unsuitable for motor circuits or power supplies with large capacitors at switch-on.\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection of the filament to confirm whether the fuse has blown without needing a continuity tester. The nickel-plated brass end caps provide reliable contact in standard fuse holders and resist corrosion in typical indoor environments. Each fuse measures 5mm diameter by 20mm length and complies with IEC standards for low-voltage fuse performance.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does F200mA mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe F denotes a fast-acting or quick blow characteristic, meaning the fuse interrupts the circuit immediately when current exceeds the rated threshold. 200mA is the current rating. The fuse will blow when continuous current exceeds 0.2A.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this fuse handle inrush current?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Quick blow fuses are designed to interrupt overcurrent immediately and do not tolerate brief surges or inrush typical of power supplies, transformers or motors. For circuits with inrush current, use a time-delay (T-rated) fuse instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it resettable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. This is a single-use fuse. Once the filament melts, the fuse must be replaced.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 200mA fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTypical applications include precision test instruments, audio pre-amplifiers, control boards in scientific equipment, and low-power signal processing circuits where rapid fault protection is needed to prevent damage to semiconductors.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488224523,"sku":"787.253UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787253UK_LB1_54bbcb54-9238-4fb2-b4dc-f55a0ebd6998.jpg?v=1715194231"},{"product_id":"mercury-5-x-20mm-f250ma-quick-blow-fuse-250v-iec-approved","title":"Mercury 5 x 20mm F250mA Quick Blow Fuse - 250V IEC Approved","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F250mA is a 5 x 20mm quick blow glass fuse rated at 250mA and 250V, designed to provide immediate circuit isolation when current exceeds the rated threshold. The quick blow characteristic means the fuse responds within milliseconds of an overload, protecting sensitive electronics from sustained overcurrent damage.\u003c\/p\u003e\n\u003cp\u003eUsed in audio equipment, power supplies, lighting control circuits, and other fine electronics where rapid fault isolation is critical, the fuse fits standard 5 x 20mm fuse holders common in European and UK equipment. The glass tube construction allows visual inspection of the internal filament to confirm whether the fuse has blown without needing test equipment.\u003c\/p\u003e\n\u003cp\u003eThe 250V rating suits both 230V mains applications and lower-voltage DC circuits in amplifiers, mixers and similar equipment. IEC approval confirms the fuse meets international safety standards for construction and performance. The fuse is a consumable component and should be replaced only with an identical rating. Using a higher-rated fuse can compromise circuit protection and invalidate equipment warranties.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'quick blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA quick blow fuse responds immediately to overcurrent, typically breaking the circuit within milliseconds. This contrasts with slow blow or time-delay fuses that tolerate brief current surges without blowing, which are used where inrush current is normal (motors, transformers).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a 250mA fuse with a higher-rated one?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Fuses are sized to protect the circuit and components downstream. Installing a higher-rated fuse (e.g. 500mA or 1A) allows more current to flow before the fuse breaks, which can damage components or create a fire risk.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 5 x 20mm fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm profile is standard in mixing desks, DJ equipment, lighting controllers, power supplies and other fine electronics. Check the equipment's fuse holder or manual to confirm the correct size and rating before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the fuse reusable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Once a fuse blows, the internal filament is permanently broken and the fuse must be replaced. Attempting to bypass or repair a blown fuse removes the circuit protection and creates a safety hazard.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488290059,"sku":"787.254UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787254UK_LB1_8bfec64e-80ae-4c3c-9376-e70da4459727.jpg?v=1715194234"},{"product_id":"mercury-5-x-20mm-f315ma-quick-blow-fuses-250v-glass","title":"Mercury 5 x 20mm F315mA Quick Blow Fuses - 250V Glass","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F315mA is a 5 x 20mm glass quick blow fuse rated at 315mA and 250V, designed to protect low-current circuits in audio equipment, lighting controllers, battery chargers and other sensitive electronics. The quick blow characteristic means the fuse responds within milliseconds of an overcurrent event, cutting power before downstream components can be damaged.\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses differ from time-delay types by opening the circuit immediately on overload, making them suited to equipment with stable current draw where any sudden spike indicates a fault. The 315mA rating sits between the more common 250mA and 500mA values, giving precise protection for circuits that draw between 200-300mA under normal operation but require fast isolation if that draw exceeds 315mA.\u003c\/p\u003e\n\u003cp\u003eThe 5 x 20mm glass cartridge format is an IEC standard used across European and international equipment, fitting into standard panel-mount and PCB-mount fuseholders. The glass body allows visual inspection of the internal filament. A blown fuse shows a broken wire and often carbon deposits on the inside of the glass. The nickel-plated end caps provide corrosion-resistant contact and are compatible with both clip-type and screw-terminal fuseholders.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'quick blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow (also called fast-acting or fast-blow) means the fuse opens the circuit within milliseconds of the current exceeding its rated value. This is the opposite of time-delay or slow-blow fuses, which tolerate brief surges without blowing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment uses 315mA fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e315mA fuses are commonly found in mixing desks, small amplifiers, LED controllers, battery chargers, and other low-power electronics where the operating current is stable but protection is needed against short circuits or component failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these sold individually or in packs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePlease check the product options or contact us to confirm the pack quantity for this listing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use a higher-rated fuse if I don't have the exact value?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Using a higher-rated fuse (e.g. 500mA instead of 315mA) removes the protection the equipment was designed with and may allow damage to occur before the fuse blows. Always replace with the same rating.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488322827,"sku":"787.255UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787255UK_LB1_c4678189-e488-4791-96c9-f6ddf46448a7.jpg?v=1715194237"},{"product_id":"mercury-5-x-20mm-f500ma-quick-blow-fuses-250v","title":"Mercury 5 x 20mm F500mA Quick Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eMercury F500mA quick blow fuses are 5 x 20mm glass cartridge fuses rated at 500mA (0.5A) on 250V circuits, designed to open the circuit rapidly when the current exceeds the rated threshold. The fast-blow characteristic means the fuse element melts and breaks the circuit within milliseconds of an overload or short-circuit event, protecting sensitive low-power electronics from damage.\u003c\/p\u003e\n\u003cp\u003eThese fuses suit applications where immediate fault clearance is required rather than delayed protection. Common uses include power supplies for audio equipment, LED drivers, small transformers, appliance control boards, test equipment and battery chargers operating below 500mA. The 5 x 20mm cartridge format fits standard inline fuse holders and PCB-mounted clips used across consumer electronics and light commercial equipment.\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection of the fuse element. A blown fuse shows a broken or blackened wire inside the tube. The nickel-plated brass end caps provide good conductivity and resist corrosion in typical indoor environments. IEC approval confirms compliance with international safety standards for fuse construction and performance characteristics.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does F500mA mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eF denotes a fast-blow or quick-acting fuse, meaning it responds within milliseconds to overcurrent. 500mA is the current rating. The fuse will blow if the circuit draws more than 500 milliamps continuously or experiences a short-circuit spike.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between fast-blow and slow-blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFast-blow fuses open the circuit immediately when current exceeds the rating, making them suitable for electronics that need instant protection. Slow-blow fuses tolerate brief current surges (such as motor start-up or transformer inrush) before blowing, and are not suitable for the same applications as these F500mA fuses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used in mains appliances?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the 250V rating covers UK 230V mains circuits. However, the 500mA current rating is very low. These fuses are for small power supplies, control circuits and low-power electronics inside appliances, not for mains inlet protection on larger loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these sold individually or in packs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the product quantity field on this page for the pack size. Mercury fuses are typically supplied in packs of 10 or more.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488421131,"sku":"787.257UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787257UK_LB1_450d9712-b87a-4908-83d5-af14b9fcc5be.jpg?v=1715194244"},{"product_id":"mercury-5-x-20mm-f630ma-quick-blow-fuse-250v-iec-compliant","title":"Mercury 5 x 20mm F630mA Quick Blow Fuse - 250V IEC Compliant","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F630mA is a 5 x 20mm glass cartridge quick blow fuse rated at 630mA (0.63A) on 250V mains. Quick blow fuses are designed to interrupt the circuit rapidly when current exceeds the rated threshold, providing fast protection for sensitive electronic components, audio equipment, and lighting control circuits where even brief overcurrent events can cause damage.\u003c\/p\u003e\n\u003cp\u003eCommonly used in audio amplifiers, DJ equipment, dimmer packs, LED drivers, and stage lighting controllers, the 5 x 20mm format is a standard IEC dimension that fits fuse holders in most professional audio and lighting gear. The glass tube construction allows visual inspection of the fuse element. A blown fuse shows a broken or discoloured internal wire, making fault diagnosis straightforward without needing a multimeter.\u003c\/p\u003e\n\u003cp\u003eThe 630mA rating sits between the more common 500mA and 1A fuses, making it useful for circuits drawing 400-550mA continuous current where a 500mA fuse would nuisance-trip and a 1A fuse would provide insufficient protection. The fuse meets IEC 127-2 dimensional and performance standards, ensuring compatibility with holders rated for 5 x 20mm cartridge fuses. Nickel-plated brass end caps provide reliable contact and corrosion resistance.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'quick blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow (also called fast-acting or F-rated) fuses respond rapidly to overcurrent, typically breaking the circuit within milliseconds when current exceeds the rating. This contrasts with slow-blow or time-delay fuses, which tolerate brief surges. Quick blow fuses are used where the protected circuit contains components that cannot survive even short overcurrent events.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this fuse handle inrush current?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Quick blow fuses are not designed to handle inrush current surges such as those from transformer or motor startup. If your circuit experiences normal startup surges, you need a slow-blow or time-delay fuse instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this fuse reusable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Once blown, the fuse must be replaced. Glass cartridge fuses are single-use components. Always replace a blown fuse with the same current rating and voltage rating to maintain circuit protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the 250V rating mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 250V rating is the maximum voltage at which the fuse can safely interrupt a fault current. For UK mains-powered equipment (230V), this provides adequate margin. Do not use this fuse in circuits exceeding 250V.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488486667,"sku":"787.258UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787258UK_LB1_b5a94c76-571e-4a15-9433-12bdc0fd1d8b.jpg?v=1715194247"},{"product_id":"mercury-5-x-20mm-f800ma-quick-blow-fuses-250v","title":"Mercury 5 x 20mm F800mA Quick Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F800mA is a quick blow fuse in a 5x20mm glass cartridge format with a 250V rating and 800mA breaking current. The fuse uses a thin wire element inside a clear glass tube with nickel-plated brass end caps, designed to melt and break the circuit within milliseconds when current exceeds the 800mA threshold.\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses (also called fast-acting or F-rated) are used in circuits with low-mass components that cannot tolerate even brief overcurrent surges, such as amplifier output stages, DAC power supplies, metering equipment, and precision test instruments. The 5x20mm cartridge format fits standard PCB-mount and panel-mount fuse holders across consumer electronics, pro audio equipment, laboratory instruments and control panels.\u003c\/p\u003e\n\u003cp\u003eThe 250V rating covers both UK 230V mains-derived power supplies and lower-voltage DC circuits down to battery-level applications, though the 800mA breaking current is most commonly seen in low-power signal processing and microcontroller circuits rather than mains loads. The glass body allows visual inspection of the wire element to confirm whether the fuse has blown without needing to test it with a meter.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between quick blow and slow blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses (F-rated) break the circuit almost instantly when current exceeds the rating, typically within 1-10 milliseconds. Slow blow fuses (T-rated) tolerate short-term overcurrent surges. Such as motor startup current. Before blowing. Quick blow fuses are used where the circuit cannot tolerate any surge, such as sensitive semiconductors or precision measurement circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does F800mA mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eF800mA means the fuse is rated for 800 milliamps (0.8 amps) continuous current and will blow quickly (F = fast-acting) if that current is exceeded. The F designation indicates quick blow behaviour as opposed to T (time-delay or slow blow).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these fuses suitable for mains voltage protection?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 250V rating covers UK mains-derived circuits, but the 800mA breaking current is very low for mains loads. These fuses are typically used in low-power DC circuits or signal paths within mains-powered equipment, not as primary mains protection. For mains inlet protection, a higher-current fuse (3A, 5A, 10A, 13A) is more appropriate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these meet UK safety standards?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Mercury fuses are manufactured to IEC standards, which cover fuse dimensions, breaking capacity and material construction for use in EU and UK markets.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488519435,"sku":"787.259UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787259UK_LB1_adf094b8-17c2-4c2e-ac43-0217713745d0.jpg?v=1715194250"},{"product_id":"mercury-5-x-20mm-f1a-quick-blow-fuses-1a-250v","title":"Mercury 5 x 20mm F1A Quick Blow Fuses - 1A 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F1A is a 5x20mm quick blow glass cartridge fuse rated at 1A 250V, designed to disconnect circuits within milliseconds when current exceeds the rated threshold. The glass body allows visual inspection of the internal element to confirm whether the fuse has blown, while the nickel-plated metal end caps provide reliable contact in standard fuse holders and panel clips.\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses are suited to protecting sensitive electronics where even brief overcurrent surges can cause component damage, such as audio equipment power supplies, control boards, and instrumentation. The 1A rating makes this fuse appropriate for low-current circuits where higher-rated fuses would fail to trip before damage occurs. The 5x20mm format is a standard cartridge size fitting most European and UK fuse holders.\u003c\/p\u003e\n\u003cp\u003eThe 250V capacity covers standard UK mains voltage with headroom, and the IEC approval confirms compliance with international standards for electrical safety. These fuses are supplied in packs suitable for workshop stock, equipment repair, and installation work where multiple units may be needed across different appliances or control panels.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between quick blow and slow blow fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses trip within milliseconds of exceeding the rated current, protecting sensitive electronics from brief surges. Slow blow fuses tolerate short-duration overloads (such as motor startup inrush) and only trip if the overcurrent is sustained for several seconds. The F1A is a quick blow type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a blown fuse with a higher-rated one?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Using a higher-rated fuse than specified by the equipment manufacturer removes the intended protection and can result in component damage or fire. Always replace a blown fuse with the same rating and type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows you to see the internal wire element. If the fuse has blown, the wire will be broken or discoloured. If you cannot see the element clearly, test with a multimeter set to continuity or resistance mode across the two end caps.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these suitable for mains voltage circuits?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating covers UK mains voltage (230V nominal). However, the 1A current rating is low for most mains appliances. Check the equipment specification to confirm the correct fuse rating before fitting.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488552203,"sku":"787.260UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787260UK_LB1_0acadcff-cf39-4564-a626-082ae538c1a6.jpg?v=1715194253"},{"product_id":"mercury-5-x-20mm-f1-25a-quick-blow-fuses-250v","title":"Mercury 5 x 20mm F1.25A Quick Blow Fuses - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F1.25A is a 5 x 20mm glass cartridge quick blow fuse rated for 250V operation, designed to provide fast-acting circuit protection in low-current applications. The fuse uses a thin wire element inside a glass tube with nickel-plated brass end caps, breaking the circuit within milliseconds when current exceeds 1.25A.\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses are used in circuits where immediate disconnection is critical to protect sensitive components. Audio equipment input stages, control circuits, battery-powered devices, and signal processing equipment. The 5 x 20mm format is a standard IEC cartridge size, fitting fuse holders in amplifiers, mixing desks, powered speakers, test equipment, and many consumer electronics. The glass body allows visual inspection of the fuse element without removal.\u003c\/p\u003e\n\u003cp\u003eThe 1.25A rating sits below the threshold of most general lighting or heating circuits but above milliamp-level signal circuits, making it appropriate for equipment drawing 150-300W at 230V or proportionally less at lower voltages. The nickel-plated brass caps resist corrosion and maintain consistent contact pressure in spring-clip fuse holders. Each fuse carries IEC approval for use in CE-compliant equipment.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'quick blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow (fast-acting) fuses break the circuit within milliseconds of the current exceeding the rating. They're used where immediate disconnection protects delicate components, unlike slow-blow fuses which tolerate brief surges.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage can it handle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fuse is rated to 250V, covering both 230V UK mains applications and lower-voltage DC circuits common in audio and control equipment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual inspection. A blown fuse shows a broken wire element inside the tube, often with blackening on the glass if the fault was severe. An intact element appears as a continuous thin wire between the end caps.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this in a 13A plug fuse holder?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. UK 13A plug fuses use a different cartridge size (25 x 6.3mm). This 5 x 20mm fuse fits panel-mount or PCB fuse holders commonly found inside equipment, not domestic plug tops.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488617739,"sku":"787.261UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787261UK_LB1_d13121a7-1fb0-4309-964a-35301ae3c043.jpg?v=1715194256"},{"product_id":"mercury-5-x-20mm-f1-6a-quick-blow-fuse-250v-fast-acting","title":"Mercury 5 x 20mm F1.6A Quick Blow Fuse - 250V Fast-Acting","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F1.6A is a 5 x 20mm glass cartridge fuse rated at 1.6 amps and 250 volts, designed as a fast-acting (quick blow) overcurrent protection device. When current exceeds the 1.6A threshold, the internal wire element melts within milliseconds to break the circuit and protect downstream components from damage caused by overload or short circuit faults.\u003c\/p\u003e\n\u003cp\u003eUsed in audio equipment, small power supplies, control panels, instrumentation and consumer electronics where low-current circuits require rapid fault protection, the fuse fits standard 5 x 20mm panel-mount and PCB-mount fuseholders. The glass body allows visual inspection of the element. A broken or discoloured wire indicates the fuse has blown and needs replacement.\u003c\/p\u003e\n\u003cp\u003eThe 250V voltage rating makes this fuse suitable for UK mains-fed equipment operating on 230V supply, provided the current draw remains below 1.6A. The nickel-plated brass end caps provide reliable contact with fuseholder terminals and resist corrosion in typical installation environments. IEC compliance ensures the fuse meets international safety standards for construction and performance.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 'quick blow' mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow (also called fast-acting or F-type) means the fuse responds immediately when current exceeds its rating. This contrasts with time-delay (T-type) fuses, which tolerate brief current surges before blowing. Quick blow fuses protect sensitive electronics that cannot withstand even short overcurrent events.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this fuse be used in mains voltage equipment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the 250V rating covers UK mains voltage of 230V. However, the 1.6A rating limits this fuse to equipment drawing no more than approximately 368W at 230V (P = V × I). Higher-power equipment requires a higher-rated fuse.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe glass body allows you to inspect the internal wire element. If the wire is broken or shows discolouration and burn marks, the fuse has blown and must be replaced with an identical 1.6A 5 x 20mm quick blow type.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat equipment typically uses 1.6A fuses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAudio amplifiers (particularly low-power valve\/tube amps), small bench power supplies, instrumentation, control circuits, and consumer electronics with low current draw commonly use 1.6A fuses for circuit protection.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488683275,"sku":"787.262UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787262UK_LB1_a9fb2c57-8542-45f2-8076-845ab1648176.jpg?v=1715194259"},{"product_id":"mercury-5-x-20mm-f2a-quick-blow-fuses-2a-250v-glass","title":"Mercury 5 x 20mm F2A Quick Blow Fuses - 2A 250V Glass","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F2A is a 5 x 20mm quick blow glass fuse rated at 2A and 250V, designed to interrupt current flow within milliseconds of detecting an overcurrent or short circuit. The glass tube body contains a thin wire element visible through the casing, allowing visual inspection of blown fuses without needing a multimeter.\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses are used in circuits where sensitive electronics require immediate protection rather than the delayed response of slow-blow types. Common applications include AV equipment, DJ mixers, amplifiers, low-voltage lighting controllers, and small power supplies where a 2A maximum draw is expected. The 5 x 20mm form factor is a standard size that fits most IEC-compliant fuse holders and clips used in consumer electronics and professional audio gear.\u003c\/p\u003e\n\u003cp\u003eThe fuse meets IEC 127 compliance for dimensional consistency and breaking capacity, which means it will physically fit standard holders and reliably interrupt fault currents within the rated voltage range. The glass construction allows for quick fault diagnosis. A broken or blackened element inside the tube indicates the fuse has blown and needs replacement. Each fuse weighs approximately 0.5g and has nickel-plated brass end caps for consistent contact with the fuse holder terminals.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent rating\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eQuick Blow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between quick blow and slow blow?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eQuick blow fuses interrupt current within milliseconds when the rated amperage is exceeded, protecting sensitive circuits from brief surges. Slow blow fuses tolerate temporary overcurrent spikes (like motor start-up) and only blow after sustained overload. For low-current electronics and AV equipment, quick blow is typically required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used in mains plugs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. UK mains plugs require BS 1362 certified fuses (typically 13A cartridge type). These 5 x 20mm fuses are designed for internal circuit protection in equipment, not mains plug use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if the fuse has blown?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eInspect the glass tube under light. A blown fuse will have a visibly broken wire element inside, often with blackening or discolouration on the glass from the arc. If the element appears intact but the circuit still doesn't function, test with a multimeter set to continuity mode.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these sold individually or in packs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck the product listing for pack quantity. Mercury fuses are typically sold in packs of 10 or 20 to provide spares for equipment maintenance.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313488748811,"sku":"787.263UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787263UK_LB1_5c7d9903-ad87-43ee-8b2c-a21279d54f50.jpg?v=1715194262"}],"url":"https:\/\/niori.co.uk\/collections\/fuses.oembed?page=2","provider":"Niori","version":"1.0","type":"link"}