{"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\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","url":"https:\/\/niori.co.uk\/products\/mercury-5-x-20mm-f630ma-quick-blow-fuse-250v-iec-compliant","provider":"Niori","version":"1.0","type":"link"}