{"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\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","url":"https:\/\/niori.co.uk\/products\/mercury-5-x-20mm-t1a-slow-blow-fuse-250v-iec-certified","provider":"Niori","version":"1.0","type":"link"}