{"product_id":"mersen-r642-fuse-reducer-class-r-600v-400a-to-600a-adapter-fuse-clip-reducer","title":"Mersen R642 Fuse Reducer – Class R – 600V – 400A to 600A Adapter (Fuse Clip Reducer)","description":"\u003cp data-start=\"141\" data-end=\"484\"\u003eThe \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eMersen\u003c\/span\u003e\u003c\/span\u003e R642 is a Class R fuse reducer designed to allow 400A fuses to be used safely in 600A Class R fuse clips. It provides a secure mechanical and electrical interface that ensures correct alignment, reliable conductivity, and safe operation within industrial power distribution systems.\u003c\/p\u003e\n\u003cp data-start=\"486\" data-end=\"818\"\u003eThis reducer is used in retrofit applications and system standardization projects where existing high-amperage fuse holders must accommodate lower-rated fuses without modifying the equipment. The rejection-style design helps maintain safety by preventing improper fuse sizing and ensuring compliance with Class R protection systems.\u003c\/p\u003e\n\u003ch3 data-section-id=\"yc43s8\" data-start=\"820\" data-end=\"842\"\u003eVoltage and Rating\u003c\/h3\u003e\n\u003cul data-start=\"844\" data-end=\"975\"\u003e\n\u003cli data-section-id=\"1oc7ype\" data-start=\"844\" data-end=\"871\"\u003eVoltage Rating: 600V AC\u003c\/li\u003e\n\u003cli data-section-id=\"lh28ea\" data-start=\"872\" data-end=\"895\"\u003eFuse Class: Class R\u003c\/li\u003e\n\u003cli data-section-id=\"7pib1n\" data-start=\"896\" data-end=\"935\"\u003eCurrent Compatibility: 400A to 600A\u003c\/li\u003e\n\u003cli data-section-id=\"1h6vkuo\" data-start=\"936\" data-end=\"975\"\u003eDesign Type: Fuse Reducer \/ Adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"uvdx3z\" data-start=\"977\" data-end=\"999\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1001\" data-end=\"1305\"\u003e\n\u003cli data-section-id=\"u5a87l\" data-start=\"1001\" data-end=\"1041\"\u003eProduct Type: Fuse Reducer Accessory\u003c\/li\u003e\n\u003cli data-section-id=\"1jhketf\" data-start=\"1042\" data-end=\"1063\"\u003ePart Number: R642\u003c\/li\u003e\n\u003cli data-section-id=\"65a2sf\" data-start=\"1064\" data-end=\"1119\"\u003eManufacturer: \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eMersen\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"lzf2pf\" data-start=\"1120\" data-end=\"1185\"\u003eFunction: Adapts lower-rated fuses to higher-rated fuse clips\u003c\/li\u003e\n\u003cli data-section-id=\"10r8xur\" data-start=\"1186\" data-end=\"1227\"\u003eApplication Use: Class R fuse systems\u003c\/li\u003e\n\u003cli data-section-id=\"qgko69\" data-start=\"1228\" data-end=\"1252\"\u003eUnit Type: Each (EA)\u003c\/li\u003e\n\u003cli data-section-id=\"d6gjpo\" data-start=\"1253\" data-end=\"1305\"\u003eDesign Style: Rejection-type safety fuse adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nucr17\" data-start=\"1307\" data-end=\"1335\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1337\" data-end=\"1709\"\u003e\n\u003cli data-section-id=\"tq6aj1\" data-start=\"1337\" data-end=\"1424\"\u003eFunction: Ensures proper electrical and mechanical compatibility between fuse sizes\u003c\/li\u003e\n\u003cli data-section-id=\"ewfbaq\" data-start=\"1425\" data-end=\"1523\"\u003eApplication Suitability: Industrial switchgear, motor control centers, and distribution panels\u003c\/li\u003e\n\u003cli data-section-id=\"19iuw5x\" data-start=\"1524\" data-end=\"1597\"\u003eSafety Feature: Rejection design prevents incorrect fuse installation\u003c\/li\u003e\n\u003cli data-section-id=\"b42ukw\" data-start=\"1598\" data-end=\"1658\"\u003eSystem Integration: Designed for UL Class R fuse systems\u003c\/li\u003e\n\u003cli data-section-id=\"19j3uzx\" data-start=\"1659\" data-end=\"1709\"\u003eInstallation Type: Clip-in fuse reducer insert\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"16isa0t\" data-start=\"1711\" data-end=\"1738\"\u003ePhysical Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1740\" data-end=\"1779\"\u003e\n\u003cli data-section-id=\"11ukr1s\" data-start=\"1740\" data-end=\"1759\"\u003eLength: 69.8 mm\u003c\/li\u003e\n\u003cli data-section-id=\"e6g449\" data-start=\"1760\" data-end=\"1779\"\u003eHeight: 50.8 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nr5bwx\" data-start=\"1781\" data-end=\"1808\"\u003eStandards and Approvals\u003c\/h3\u003e\n\u003cul data-start=\"1810\" data-end=\"1929\"\u003e\n\u003cli data-section-id=\"1gh0cf5\" data-start=\"1810\" data-end=\"1848\"\u003eUL Listed for Class R fuse systems\u003c\/li\u003e\n\u003cli data-section-id=\"1ygh62h\" data-start=\"1849\" data-end=\"1866\"\u003eCSA Certified\u003c\/li\u003e\n\u003cli data-section-id=\"1xptnjd\" data-start=\"1867\" data-end=\"1929\"\u003eDesigned for industrial electrical distribution compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"1931\" data-end=\"1947\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"1949\" data-end=\"2211\"\u003e\n\u003cli data-section-id=\"1g63lej\" data-start=\"1949\" data-end=\"1990\"\u003eIndustrial power distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"18xv2zo\" data-start=\"1991\" data-end=\"2023\"\u003eMotor control centers (MCCs)\u003c\/li\u003e\n\u003cli data-section-id=\"1xfyblg\" data-start=\"2024\" data-end=\"2049\"\u003eSwitchgear assemblies\u003c\/li\u003e\n\u003cli data-section-id=\"1bf2q17\" data-start=\"2050\" data-end=\"2087\"\u003eRetrofit electrical installations\u003c\/li\u003e\n\u003cli data-section-id=\"gs6y6p\" data-start=\"2088\" data-end=\"2125\"\u003eElectrical system standardization\u003c\/li\u003e\n\u003cli data-section-id=\"1nbla9b\" data-start=\"2126\" data-end=\"2162\"\u003eMaintenance and upgrade projects\u003c\/li\u003e\n\u003cli data-section-id=\"1ugkos5\" data-start=\"2163\" data-end=\"2211\"\u003eCommercial and heavy industrial applications\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mersen","offers":[{"title":"NEW","offer_id":48494446084345,"sku":"R642","price":348.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/PHP-Fuse-Reducers-Mersen-TIMG_jpg_aece48cb-f3fb-4f6e-b7c3-663a64a9c45b.webp?v=1780848588","url":"https:\/\/mycircuitbreakers.com\/products\/mersen-r642-fuse-reducer-class-r-600v-400a-to-600a-adapter-fuse-clip-reducer","provider":"My Circuit Breakers","version":"1.0","type":"link"}