{"product_id":"cooper-bussmann-frn-r-20-cartridge-time-delay-fuse-rk5","title":"Cooper Bussmann FRN-R-20 Cartridge Time Delay Fuse RK5","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe COOPER BUSSMANN FRN-R-20 is a Class RK5 cartridge time delay fuse rated at 20 amps, designed for general-purpose overcurrent protection in industrial and commercial electrical systems. The dual-element, time delay construction allows the fuse to ride through harmless inrush currents from motor loads and transformers while still providing fast clearing on sustained overloads and short circuits. At 2 inches overall length and 14.3 mm diameter, it fits standard RK5-class fuse holders and is a common choice for licensed electricians protecting motor branch circuits, HVAC equipment, and control panels.\u003c\/p\u003e\u003cp\u003eThis fuse is suited for residential and light commercial HVAC equipment, pump motors, and control panel applications where motor inrush tolerance is required. The dual-element design accommodates temporary overloads during startup without nuisance opening, making it appropriate for equipment with high locked-rotor amperage. Electricians and HVAC technicians install this fuse in disconnect switches and fusible load centers serving compressor circuits, air handlers, and similar motor-driven equipment.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e20-amp rating with Class RK5 time delay dual-element construction for motor-load compatibility\u003c\/li\u003e\n\u003cli\u003e20 kA interrupting rating at DC 200 volts RMS provides strong fault-current clearing capability\u003c\/li\u003e\"\u003cli\u003eNon-indicating design in a standard cartridge body compatible with RK5 fuse holders\u003c\/li\u003e\n\u003cli\u003eCE Certified, CSA C22.2 No. 248.12 Class 1422-02 File 53787 Certified, and UL Listed 248-12 Class RK5 Guide JDDZ File E4273\u003c\/li\u003e\n\u003cli\u003eOverall length of 2 inches (50.8 mm) and diameter of 14.3 mm for standard fitment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement for Class RK5 fuse holders and fusible disconnects requiring a 20-amp time delay cartridge fuse.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Use an appropriately rated fuse puller when servicing cartridge fuses in live-work-adjacent environments. Verify that the replacement fuse amperage and class match the original equipment nameplate and circuit protection requirements before energizing.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Class\u003c\/strong\u003e: RK5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Type\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 20 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Timing\u003c\/strong\u003e: Time Delay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Body Type\u003c\/strong\u003e: Cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Elements\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupting Rating\u003c\/strong\u003e: 20 kA at DC 200 volts RMS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2 inches (50.8 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Diameter\u003c\/strong\u003e: 14.3 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount Type\u003c\/strong\u003e: Fuse Holder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicating\u003c\/strong\u003e: Non-Indicating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications\u003c\/strong\u003e: CE Certified; CSA C22.2 No. 248.12 Class 1422-02 File 53787 Certified; UL Listed 248-12 Class RK5 Guide JDDZ File E4273\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 39121605\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: COOPER BUSSMANN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: FRN-R-20\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51692300665138,"sku":"FRN-R-20","price":206.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6a99fe5b348630eb6bb2446ed3e729cc.jpg?v=1788295975","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-frn-r-20-cartridge-time-delay-fuse-rk5","provider":"Voomi Supply","version":"1.0","type":"link"}