{"product_id":"cooper-bussmann-frn-r-80-rk5-cartridge-time-delay-fuse-80a","title":"Cooper Bussmann FRN-R-80 RK5 Cartridge Time Delay Fuse 80A","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe COOPER BUSSMANN FRN-R-80 is a cartridge-style, time-delay fuse rated at 80 amps and 250 volts, classified under UL Class RK5. It features a dual-element design that tolerates temporary motor-inrush and transformer-magnetizing currents without nuisance opening, while still providing fast response to sustained overloads and short-circuit faults. The fuse body measures 26.9 mm in diameter and 5.875 inches in overall length, sized for standard Class RK5 fuse holders and disconnects. Electricians and HVAC technicians install this fuse in motor branch circuits, HVAC disconnect boxes, and general-purpose feeder protection applications where reliable overcurrent protection is required.\u003c\/p\u003e\u003cp\u003eThe FRN-R-80 is suited for residential and light commercial HVAC systems, motor circuits, and general industrial feeder applications where time-delay overcurrent protection is required. Its bolt-on mount type integrates directly into standard fusible disconnect switches and panelboard fuse holders designed for Class RK5 cartridge fuses. Where equipment draws high inrush current at startup, the dual-element design allows the circuit to stabilize before the fuse evaluates the load, reducing unwanted interruptions during normal startup cycles.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTime-delay dual-element design tolerates motor inrush without nuisance tripping\u003c\/li\u003e\n\u003cli\u003e80-amp continuous rating at 250 volts AC\u003c\/li\u003e\n\u003cli\u003e20 kA interrupting rating at DC 200 RMS for short-circuit protection\u003c\/li\u003e\n\u003cli\u003eClass RK5 classification for use in RK5-rated fuse holders and disconnects\u003c\/li\u003e\n\u003cli\u003eBolt-on mount type for secure seating in standard fusible disconnects\u003c\/li\u003e\n\u003cli\u003eCE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation fuse for Class RK5 fusible disconnect switches and fuse holders rated for cartridge fuses at 250 volts and 80 amps or greater.\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) and applicable local codes. Always de-energize and lock out the disconnect or panel before removing or installing fuses. Verify that the fuse holder or disconnect is rated for Class RK5 cartridges and is suitable for the circuit voltage and amperage before installation. Do not substitute a fuse of a higher amperage rating as a replacement, as this will compromise overcurrent protection.\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\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\u003eAmperage\u003c\/strong\u003e: 80 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage\u003c\/strong\u003e: 250 volts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupting Rating\u003c\/strong\u003e: 20 kA at DC 200 RMS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Elements\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount Type\u003c\/strong\u003e: Bolt-On\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5.875 inches (149.2 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Diameter\u003c\/strong\u003e: 26.9 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.32 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\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\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-80\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51706043138354,"sku":"FRN-R-80","price":406.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f7cfbf84b119b089be6c85f57cd26014.jpg?v=1788432344","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-frn-r-80-rk5-cartridge-time-delay-fuse-80a","provider":"Voomi Supply","version":"1.0","type":"link"}