{"product_id":"cooper-bussmann-lps-rk-4sp-time-delay-fuse-4a-rk1","title":"Cooper Bussmann LPS-RK-4SP Time Delay Fuse 4A RK1","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe COOPER BUSSMANN LPS-RK-4SP is a Class RK1 time delay cartridge fuse rated at 4 amps for general purpose overcurrent protection in industrial and commercial electrical systems. It features a dual-element design that tolerates brief inrush currents while still providing fast response to sustained overloads and short circuits. The fuse body measures 5 inches in overall length and 20.6 mm in diameter, fitting standard RK1 fuse holders. With an interrupting rating of 100 kA at DC and 300 kA at AC (RMS), it handles high-fault-current environments where reliable protection is critical. Licensed electricians and maintenance technicians are the primary installers.\u003c\/p\u003e\n\u003cp\u003eThis fuse is suited for general purpose branch circuit and feeder protection in residential, commercial, and light industrial applications. The time delay characteristic makes it a practical choice for motor circuits, transformer primaries, and control panels where startup inrush current would otherwise cause nuisance tripping with a standard fast-acting fuse. It mounts in a compatible RK1 fuse holder and is sold individually, with a minimum order quantity of 10 units.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eClass RK1 dual-element time delay design tolerates motor inrush without nuisance opening\u003c\/li\u003e\n  \u003cli\u003e4 amp rating suitable for small motor and control circuit protection\u003c\/li\u003e\n  \u003cli\u003e300 kA interrupting rating at AC (RMS) for high-fault-current installations\u003c\/li\u003e\n  \u003cli\u003e100 kA interrupting rating at DC for DC bus and battery-backed systems\u003c\/li\u003e\n  \u003cli\u003eNon-indicating body keeps installation profile low in tight panel layouts\u003c\/li\u003e\n  \u003cli\u003eCE, CSA, and UL Listed certifications support use across North American and international job sites\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in standard Class RK1 fuse holders. Verify holder ampere rating and voltage rating match the circuit requirements 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 applicable local codes. Always de-energize and lock out the circuit before removing or installing any fuse. Confirm the fuse holder is rated for Class RK1 cartridge fuses and that the circuit voltage does not exceed the fuse voltage rating. Do not substitute a higher-amperage fuse to resolve repeated openings  -  investigate the root cause of the overcurrent condition first.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 4 amps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFuse Class\u003c\/strong\u003e: RK1\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\u003eNumber of Elements\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Rating (AC RMS)\u003c\/strong\u003e: 300 kA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Rating (DC)\u003c\/strong\u003e: 100 kA\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: 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\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; UL Listed 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: LPS-RK-4SP\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51971221324082,"sku":"LPS-RK-4SP","price":591.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4527f5ab67b29420b6efdb72fdae27bf.jpg?v=1789954863","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-lps-rk-4sp-time-delay-fuse-4a-rk1","provider":"Voomi Supply","version":"1.0","type":"link"}