{"product_id":"mersen-r422-fuse-reducer-class-r-200a-400a-600v-rejection-type-fuse-adapter-ferraz-shawmut","title":"Mersen R422 Fuse Reducer – Class R – 200A–400A – 600V Rejection-Type Fuse Adapter (Ferraz Shawmut)","description":"\u003cp data-start=\"155\" data-end=\"643\"\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 R422 is a Class R rejection-type fuse reducer designed to allow 200A fuses to be used safely in 400A Class R fuse clips. It ensures proper mechanical fit, electrical alignment, and code-compliant operation when adapting fuse sizes within existing high-capacity fuse holders. This makes it a practical solution for retrofits, equipment standardization, and reducing inventory complexity in industrial power distribution systems.\u003c\/p\u003e\n\u003cp data-start=\"645\" data-end=\"846\"\u003eClass R reducers like the R422 are engineered with rejection features so only compatible Class R fuses can be installed, preventing unsafe fuse substitution and maintaining system protection integrity.\u003c\/p\u003e\n\u003ch3 data-section-id=\"yc43s8\" data-start=\"848\" data-end=\"870\"\u003eVoltage and Rating\u003c\/h3\u003e\n\u003cul data-start=\"872\" data-end=\"1018\"\u003e\n\u003cli data-section-id=\"1oc7ype\" data-start=\"872\" data-end=\"899\"\u003eVoltage Rating: 600V AC\u003c\/li\u003e\n\u003cli data-section-id=\"lh28ea\" data-start=\"900\" data-end=\"923\"\u003eFuse Class: Class R\u003c\/li\u003e\n\u003cli data-section-id=\"1qda0hi\" data-start=\"924\" data-end=\"979\"\u003eCurrent Compatibility: 200A fuse in 400A fuse clips\u003c\/li\u003e\n\u003cli data-section-id=\"1m71c13\" data-start=\"980\" data-end=\"1018\"\u003eType: Rejection-style fuse reducer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"uvdx3z\" data-start=\"1020\" data-end=\"1042\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1044\" data-end=\"1348\"\u003e\n\u003cli data-section-id=\"rw3r2l\" data-start=\"1044\" data-end=\"1096\"\u003eProduct Type: Fuse Reducer \/ Fuse Clip Accessory\u003c\/li\u003e\n\u003cli data-section-id=\"1jj0sef\" data-start=\"1097\" data-end=\"1118\"\u003ePart Number: R422\u003c\/li\u003e\n\u003cli data-section-id=\"65a2sf\" data-start=\"1119\" data-end=\"1174\"\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=\"1das4tv\" data-start=\"1175\" data-end=\"1213\"\u003eAlternate Mfr Part Number: W219600\u003c\/li\u003e\n\u003cli data-section-id=\"10r8xur\" data-start=\"1214\" data-end=\"1255\"\u003eApplication Use: Class R fuse systems\u003c\/li\u003e\n\u003cli data-section-id=\"qgko69\" data-start=\"1256\" data-end=\"1280\"\u003eUnit Type: Each (EA)\u003c\/li\u003e\n\u003cli data-section-id=\"1mqvec\" data-start=\"1281\" data-end=\"1348\"\u003eDesign Type: Rejection fuse adapter (safety-interlocked sizing)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nucr17\" data-start=\"1350\" data-end=\"1378\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1380\" data-end=\"1840\"\u003e\n\u003cli data-section-id=\"i2bi6v\" data-start=\"1380\" data-end=\"1508\"\u003eFunction: Allows lower-rated fuse installation in higher-rated fuse holders while maintaining proper protection coordination\u003c\/li\u003e\n\u003cli data-section-id=\"5d8qvo\" data-start=\"1509\" data-end=\"1589\"\u003eSafety Feature: Rejection design prevents incorrect fuse class or oversizing\u003c\/li\u003e\n\u003cli data-section-id=\"5hxbb4\" data-start=\"1590\" data-end=\"1693\"\u003eApplication Suitability: Industrial control panels, motor control centers, and distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"rei19k\" data-start=\"1694\" data-end=\"1767\"\u003eSystem Integration: Designed specifically for UL Class R fuse systems\u003c\/li\u003e\n\u003cli data-section-id=\"mtzj3p\" data-start=\"1768\" data-end=\"1840\"\u003eInstallation: Insert-style accessory used within existing fuse clips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nr5bwx\" data-start=\"1842\" data-end=\"1869\"\u003eStandards and Approvals\u003c\/h3\u003e\n\u003cul data-start=\"1871\" data-end=\"2002\"\u003e\n\u003cli data-section-id=\"1c9k523\" data-start=\"1871\" data-end=\"1907\"\u003eUL Listed (Class R fuse systems)\u003c\/li\u003e\n\u003cli data-section-id=\"1ygh62h\" data-start=\"1908\" data-end=\"1925\"\u003eCSA Certified\u003c\/li\u003e\n\u003cli data-section-id=\"5n85j0\" data-start=\"1926\" data-end=\"2002\"\u003eIndustrial electrical accessory compliance for fuse coordination systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"2004\" data-end=\"2020\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"2022\" data-end=\"2268\"\u003e\n\u003cli data-section-id=\"1c8wqh4\" data-start=\"2022\" data-end=\"2062\"\u003eIndustrial power distribution panels\u003c\/li\u003e\n\u003cli data-section-id=\"18xv2zo\" data-start=\"2063\" data-end=\"2095\"\u003eMotor control centers (MCCs)\u003c\/li\u003e\n\u003cli data-section-id=\"1bf2q17\" data-start=\"2096\" data-end=\"2133\"\u003eRetrofit electrical installations\u003c\/li\u003e\n\u003cli data-section-id=\"179acl2\" data-start=\"2134\" data-end=\"2172\"\u003eEquipment standardization projects\u003c\/li\u003e\n\u003cli data-section-id=\"wlcisa\" data-start=\"2173\" data-end=\"2213\"\u003eMaintenance and fuse system upgrades\u003c\/li\u003e\n\u003cli data-section-id=\"1damahw\" data-start=\"2214\" data-end=\"2268\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mersen","offers":[{"title":"NEW","offer_id":48494438482169,"sku":"R422","price":334.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/PHP-Fuse-Reducers-Mersen-TIMG_jpg_4b519d3a-cff3-4262-9c94-07f9c586b391.webp?v=1780848258","url":"https:\/\/mycircuitbreakers.com\/products\/mersen-r422-fuse-reducer-class-r-200a-400a-600v-rejection-type-fuse-adapter-ferraz-shawmut","provider":"My Circuit Breakers","version":"1.0","type":"link"}