{"product_id":"merit-brass-a4j250-class-j-fuse-250-amp-600v","title":"Merit Brass A4J250 Class J Fuse 250 Amp 600V","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe MERIT BRASS A4J250 is a Class J current-limiting fuse rated at 250 amps and 600 volts AC. Class J fuses are dual-element, time-delay designs built to protect motors, transformers, panelboards, and feeder circuits from both overloads and short-circuit faults. The time-delay element allows for normal motor inrush currents without nuisance tripping, while the fast-acting element clears hard faults quickly to limit arc energy and downstream damage. Licensed electricians install this fuse in Class J fuse holders and disconnect switches where high interrupting capacity and precise ampere ratings are required by code.\u003c\/p\u003e\u003cp\u003eThis fuse is suited for commercial and industrial electrical installations where branch-circuit or feeder protection is required under NEC guidelines. Typical applications include motor disconnect switches, combination starters, and panelboard feeders in facilities requiring Class J-rated overcurrent protection. The compact form factor fits standard Class J rejection-style fuse blocks that prevent substitution of lower-rated fuse classes.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e250-amp continuous current rating for heavy motor and feeder circuit protection\u003c\/li\u003e\n\u003cli\u003e600-volt AC rating covers most commercial distribution voltages\u003c\/li\u003e\n\u003cli\u003eClass J current-limiting design provides high interrupting capacity to limit fault energy\u003c\/li\u003e\n\u003cli\u003eDual-element time-delay construction tolerates motor inrush without nuisance opening\u003c\/li\u003e\n\u003cli\u003eRejection-style Class J dimensions prevent substitution of non-current-limiting fuse classes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in Class J fuse holders and rejection-style disconnect switches rated for 250-amp, 600-volt Class J fuses. Verify holder ampere and voltage ratings match before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a qualified, licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out\/tag out the circuit completely before removing or installing any fuse. Use insulated fuse pullers rated for the voltage and ampere class involved. Never replace a fuse with one of a higher ampere rating than the circuit is designed and protected for.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmpere Rating\u003c\/strong\u003e: 250 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e: 600 volts AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Class\u003c\/strong\u003e: Class J\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 7.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 2.120 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 2.120 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.750 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity per Pack\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 78200196039\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: MERIT BRASS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: A4J250\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MERIT BRASS","offers":[{"title":"Default Title","offer_id":51383825826098,"sku":"A4J250","price":888.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/312678328.jpg?v=1782608589","url":"https:\/\/voomisupply.com\/products\/merit-brass-a4j250-class-j-fuse-250-amp-600v","provider":"Voomi Supply","version":"1.0","type":"link"}