{"product_id":"cooper-bussmann-frs-r-40-rk5-40a-time-delay-fuse","title":"Cooper Bussmann FRS-R-40 RK5 40A Time Delay Fuse","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe COOPER BUSSMANN FRS-R-40 is a cartridge-style, time delay fuse rated at 40 amps in the RK5 fuse class. Designed for general-purpose overcurrent protection, this dual-element fuse tolerates temporary motor-inrush and transformer-magnetizing currents without nuisance opening, while still responding quickly to short-circuit faults. The fuse body measures 27 mm in diameter and 5.5 inches in overall length. It carries a 20 kA interrupt rating at DC 200 volts RMS, making it suitable for circuits where high available fault current is a concern. Licensed electricians and industrial maintenance techs are the primary installers.\u003c\/p\u003e\u003cp\u003eThe FRS-R-40 is applied in motor branch circuits, HVAC equipment, transformers, and general industrial control panels where time delay characteristics are required to ride through startup surges. The RK5 class designation means it fits standard Class RK5 fuse holders. It is suitable for residential and light commercial applications as well as heavier industrial installations where the amperage and interrupt rating fall within equipment requirements. Always verify the panel or fuse holder is rated for Class RK5 cartridge fuses before installation.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDual-element construction provides time delay on overload while maintaining fast response to short circuits\u003c\/li\u003e\n\u003cli\u003e40 amp rating with 20 kA interrupt capacity at DC 200 volts RMS\u003c\/li\u003e\n\u003cli\u003eRK5 class fuse fits standard Class RK5 fuse holders and disconnects\u003c\/li\u003e\n\u003cli\u003eNon-indicating design in a compact cartridge body: 27 mm diameter, 5.5 inches overall length\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\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in Class RK5 fuse holders and fusible disconnect switches rated for cartridge fuses. Consult equipment documentation to confirm the fuse holder accepts Class RK5 fuses at 40 amps before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a qualified electrician in accordance with applicable NEC requirements. Always de-energize and lock out the circuit before replacing a fuse. Confirm the fuse holder, disconnect, and wiring are all rated for the applied voltage and available fault current. Do not substitute a different fuse class or higher ampere rating to restore service without verifying circuit protection requirements.\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: 40 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupt Rating\u003c\/strong\u003e: 20 kA at DC 200 volts RMS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Elements\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndicating\u003c\/strong\u003e: Non-Indicating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5.5 inches (139.70 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Diameter\u003c\/strong\u003e: 27 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount Type\u003c\/strong\u003e: Fuse Holder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.31 pounds\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; 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: FRS-R-40\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51695854092594,"sku":"FRS-R-40","price":628.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/eb4a03dd34a639a36324c203e73d4c2a.jpg?v=1788338815","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-frs-r-40-rk5-40a-time-delay-fuse","provider":"Voomi Supply","version":"1.0","type":"link"}