{"product_id":"cooper-bussmann-frs-r-4-rk5-time-delay-fuse-4a-5-in","title":"Cooper Bussmann FRS-R-4 RK5 Time Delay Fuse 4A 5 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe COOPER BUSSMANN FRS-R-4 is a cartridge-style, time-delay fuse rated at 4 amps and classified as RK5. It measures 5 inches in overall length with a body diameter of 0.81 inches and is designed for general-purpose overcurrent protection in industrial and commercial electrical systems. The dual-element, time-delay construction allows it to ride through brief inrush currents without nuisance tripping while still responding decisively to sustained overloads and short-circuit faults. Licensed electricians and maintenance technicians install this fuse in fuse holders where RK5-class protection is required. Certifications include CE, CSA C22.2 No. 248.12, and UL Listed 248-12 Class RK5.\u003c\/p\u003e\n\u003cp\u003eThe FRS-R-4 is suited for residential, commercial, and light industrial electrical panels and equipment where RK5 cartridge fuses are specified. Common applications include motor branch circuits, transformer secondaries, and control circuits that experience normal startup inrush. It mounts in standard fuse holders sized for 5-inch cartridge fuses and is used wherever a non-indicating, dual-element time-delay fuse at 4 amps is called for by the system design or equipment nameplate.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTime-delay dual-element design tolerates motor and transformer inrush without nuisance tripping\u003c\/li\u003e\n  \u003cli\u003eRK5 class rating for general-purpose overcurrent protection\u003c\/li\u003e\n  \u003cli\u003e20 kA interrupting rating at DC 200 V RMS for reliable fault clearing\u003c\/li\u003e\n  \u003cli\u003eNon-indicating body keeps installation compact with no added indicator components\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  \u003cli\u003eMounts in standard cartridge fuse holders — no special tooling required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement for RK5-class cartridge fuse positions requiring a 4-amp, 5-inch time-delay fuse in standard fuse holders.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified electrician in accordance with the NEC and applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Use an insulated fuse puller rated for the voltage of the circuit — never pull a fuse from a live holder with bare hands or unrated tools. Verify the replacement fuse class, amperage, and voltage rating match the circuit and equipment nameplate before restoring power.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 4 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 (Dual Element)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndicating\u003c\/strong\u003e: Non-Indicating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Rating\u003c\/strong\u003e: 20 kA at 200 volts DC RMS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 5 inches (127 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Diameter\u003c\/strong\u003e: 0.81 inches (20.6 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: 0.14 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\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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-4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51707942601010,"sku":"FRS-R-4","price":454.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c517c1ce47dc7d4ac9c2b28e3f5607b8.jpg?v=1788443051","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-frs-r-4-rk5-time-delay-fuse-4a-5-in","provider":"Voomi Supply","version":"1.0","type":"link"}