{"product_id":"cooper-bussmann-frs-r-4-1-2-time-delay-fuse-4-5a-rk5","title":"Cooper Bussmann FRS-R-4-1\/2 Time Delay Fuse 4.5A RK5","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe COOPER BUSSMANN FRS-R-4-1\/2 is a time delay cartridge fuse rated at 4.5 amps in the Class RK5 designation. It is designed for general-purpose overcurrent protection in electrical distribution systems where brief inrush currents must be tolerated without nuisance tripping. The fuse measures 5 inches in overall length and 20.6 millimeters in diameter, and features a dual-element construction that distinguishes between harmless transient surges and genuine fault conditions. Licensed electricians and electrical contractors install this fuse in fuse holders during panel work, motor circuit protection, and equipment branch circuit applications.\u003c\/p\u003e\n\u003cp\u003eThis fuse is suited for residential and light commercial electrical installations where Class RK5 time delay protection is specified. It is commonly installed in fuse holders serving motor loads, HVAC equipment, and general branch circuits that require a fuse capable of riding through startup inrush without opening. The non-indicating body provides no visual fault signal, so replacement follows standard continuity testing during troubleshooting.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eClass RK5 time delay rating handles motor inrush and transient overloads without nuisance opening\u003c\/li\u003e\n  \u003cli\u003eDual-element construction separates overload response from short-circuit interruption\u003c\/li\u003e\n  \u003cli\u003e20 kA interrupting capacity at DC 200 volts RMS\u003c\/li\u003e\n  \u003cli\u003eNon-indicating cartridge body — 5 inches long, 20.6 millimeters in diameter\u003c\/li\u003e\n  \u003cli\u003eMounts in standard Class RK5 fuse holders\u003c\/li\u003e\n  \u003cli\u003eCE Certified, CSA Certified, and UL Listed to applicable overcurrent protection standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in standard fuse holders that accept Class RK5 cartridge fuses. Confirm holder sizing matches the 5-inch overall length and 20.6-millimeter diameter before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Use an appropriately rated fuse puller for cartridge fuse removal — do not pull live fuses by hand. Verify the replacement fuse amperage and class match the circuit protection requirements exactly 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\u003eFuse Timing\u003c\/strong\u003e: Time Delay\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 4.5 amps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Capacity\u003c\/strong\u003e: 20 kA at DC 200 volts RMS\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\u003eOverall Length\u003c\/strong\u003e: 5 inches (127 millimeters)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Diameter\u003c\/strong\u003e: 20.6 millimeters\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\u003eWeight\u003c\/strong\u003e: 0.15 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 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-4-1\/2\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51705881461042,"sku":"FRS-R-4-1\/2","price":164.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d2d2bf14ec959b2148505a95f3b84fc1.jpg?v=1788431640","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-frs-r-4-1-2-time-delay-fuse-4-5a-rk5","provider":"Voomi Supply","version":"1.0","type":"link"}