{"product_id":"mercury-5-x-20mm-f15a-quick-blow-glass-fuse-250v","title":"Mercury 5 x 20mm F15A Quick Blow Glass Fuse - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F15A is a 5 x 20mm quick blow glass cartridge fuse rated at 15 amps and 250 volts. The fuse uses a thin wire element sealed inside a glass tube with nickel-plated brass end caps, designed to break the circuit within milliseconds of the current exceeding the 15A threshold. Quick blow fuses react faster than slow-blow or time-delay types, making them suited to circuits where equipment should be isolated immediately on fault rather than riding through brief inrush currents.\u003c\/p\u003e\n\u003cp\u003eUsed in electronics, audio equipment, small appliances, power supplies and control panels where the load current runs close to or at the fuse rating under normal operation, and where a fault such as a short circuit or component failure needs to trigger instant disconnection. The 5 x 20mm format fits standard cartridge fuse holders and clips found in IEC mains inlet modules, PCB-mounted holders, and panel-mount fuse blocks.\u003c\/p\u003e\n\u003cp\u003eThe glass body allows visual confirmation of whether the fuse has blown — the wire element inside will show a visible break or discolouration after a fault. The nickel-plated brass end caps provide reliable contact and resist corrosion in indoor and low-humidity environments. The fuse meets IEC 60127 standards for miniature fuses, ensuring consistent breaking capacity and dimensional compatibility with holders from other manufacturers.\u003c\/p\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 (also called fast-acting or F-rated) break the circuit within milliseconds of the current exceeding the rated value. Slow blow fuses (T-rated or time-delay) tolerate brief current surges before breaking, allowing motors or capacitive loads to start without nuisance blowing. The F15A is a quick blow type, so it's not suited to circuits with high inrush currents at switch-on.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this replace a 13A fuse?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Fuses must be matched to the circuit's design current and the cable rating protecting that circuit. Fitting a higher-rated fuse than specified can allow overcurrent to damage wiring or equipment before the fuse breaks. Only use a 15A fuse where the circuit design calls for 15A protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the glass construction affect?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eGlass-bodied fuses allow you to see whether the internal wire element has broken. The glass itself provides no electrical function — it's purely a housing. Ceramic-bodied fuses in the same rating offer higher breaking capacity for fault currents but are opaque, so you can't visually confirm the state of the fuse without testing it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it reusable after it blows?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Once the fuse has blown the wire element inside is severed and the fuse must be replaced. Do not attempt to bypass a blown fuse or fit a higher-rated fuse without first identifying and fixing the fault that caused the original fuse to blow.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313490092299,"sku":"787.272UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787272UK_LB1_beceea9c-c3ad-495e-a88e-a4c934ed5abe.jpg?v=1715194291","url":"https:\/\/niori.co.uk\/products\/mercury-5-x-20mm-f15a-quick-blow-glass-fuse-250v","provider":"Niori","version":"1.0","type":"link"}