{"product_id":"ferraz-shawmut-a6k400r-class-rk1-400a-600v-fuse","title":"Ferraz Shawmut A6K400R Class RK1 400A 600V Fuse","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe FERRAZ SHAWMUT A6K400R is a Class RK1 fast-acting blade fuse rated at 400 amps and 600 volts AC (300 volts DC). It belongs to the Amp-Trap product line and is engineered for high-performance overcurrent protection in demanding electrical systems. Class RK1 fuses offer a higher degree of current limitation than standard Class K fuses, making this unit well suited for protecting motors, feeders, and service entrance equipment where tight fault-current control is required. Licensed electricians and industrial maintenance technicians are the primary installers.\u003c\/p\u003e\u003cp\u003eThis fuse is applied in commercial and industrial electrical panels, motor control centers, switchboards, and distribution equipment where 600-volt-rated overcurrent protection at 400 amps is required. Its fast-acting characteristic makes it appropriate for protecting components sensitive to sustained overloads, including transformers, capacitor banks, and branch circuit conductors. It is also rated for 300 volts DC, covering battery backup systems and DC distribution applications common in facilities with uninterruptible power supplies.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eClass RK1 current-limiting performance for tighter fault-current control than standard Class K ratings\u003c\/li\u003e\n\u003cli\u003eFast-acting response protects sensitive downstream equipment from sustained overloads\u003c\/li\u003e\n\u003cli\u003eDual voltage rating: 600 volts AC and 300 volts DC\u003c\/li\u003e\n\u003cli\u003e400-amp continuous current rating for feeder and service entrance applications\u003c\/li\u003e\n\u003cli\u003eBlade-style form factor for compatibility with standard Class RK1 fuse holders and blocks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement for Class RK1 blade fuse installations rated at 400 amps and 600 volts AC in commercial and industrial overcurrent protection applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize and lock out the circuit completely before removing or installing any fuse. Verify the fuse holder or block is rated for Class RK1 fuses at or above the voltage and amperage of this device before installation. Do not replace a Class RK1 fuse with a lower-rated class, as this reduces current-limiting performance and may not comply with the original equipment design.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage Rating\u003c\/strong\u003e: 400 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Rating (AC)\u003c\/strong\u003e: 600 volts AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Rating (DC)\u003c\/strong\u003e: 300 volts DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Class\u003c\/strong\u003e: RK1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Action\u003c\/strong\u003e: Fast-Acting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm Factor\u003c\/strong\u003e: Blade\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: FERRAZ SHAWMUT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: A6K400R\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MERSEN","offers":[{"title":"Default Title","offer_id":68308909818162,"sku":"A6K400R","price":516.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3e203fa456e6cbca93f0bd6a7bc7cc5e.jpg?v=1793778243","url":"https:\/\/voomisupply.com\/products\/ferraz-shawmut-a6k400r-class-rk1-400a-600v-fuse","provider":"Voomi Supply","version":"1.0","type":"link"}