{"product_id":"mercury-f12-5a-quick-blow-glass-fuse-5x20mm-250v","title":"Mercury F12.5A Quick Blow Glass Fuse 5x20mm - 250V","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury F12.5A is a quick blow glass fuse in 5x20mm format, rated to 250V and 12.5A. The fuse uses a thin wire element inside a clear glass tube with nickel-plated brass end caps, designed to break instantly when current exceeds the 12.5A rating. Quick blow fuses respond within milliseconds to overcurrent, making them suitable for circuits where sensitive components need immediate protection.\u003c\/p\u003e\n\u003cp\u003eThese fuses fit standard 5x20mm fuseholders in small appliances, control panels, audio equipment, lighting controllers and test instruments. The 250V rating covers both 230V mains circuits and lower-voltage DC applications. The glass body allows visual inspection of the element after a fault, so you can confirm whether the fuse has blown without needing a multimeter.\u003c\/p\u003e\n\u003cp\u003eIEC 60127 compliant construction ensures consistent breaking capacity and dimensional accuracy across production batches. The nickel-plated brass end caps resist corrosion and maintain good electrical contact in panel-mount fuseholders. Each fuse measures exactly 5mm diameter and 20mm length, fitting any holder designed to the same IEC 60127-2 standard.\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 break within milliseconds of exceeding their rated current, protecting sensitive electronics from brief surges. Slow blow (time-delay) fuses tolerate short current spikes without breaking, which suits motors and transformers that draw higher current on startup. Use quick blow fuses where components cannot handle any overcurrent, even briefly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used in 230V mains circuits?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 250V rating covers UK 230V mains and lower DC voltages. Confirm the 12.5A rating matches your circuit requirement before installation.\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 clear glass body lets you see the wire element inside. A blown fuse shows a broken wire or blackened glass from arcing. An intact fuse has a continuous wire visible between the end caps.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these fuses reusable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Once a fuse blows it must be replaced. Attempting to bypass or repair a blown fuse creates a fire risk and removes the circuit protection the fuse was installed to provide.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313489993995,"sku":"787.271UK","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/787271UK_LB1_5846a876-0893-435a-85e1-77d8bb79619d.jpg?v=1715194287","url":"https:\/\/niori.co.uk\/products\/mercury-f12-5a-quick-blow-glass-fuse-5x20mm-250v","provider":"Niori","version":"1.0","type":"link"}