{"product_id":"cooper-bussmann-frs-r-50-50a-rk5-time-delay-fuse","title":"Cooper Bussmann FRS-R-50 50A RK5 Time Delay Fuse","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe COOPER BUSSMANN FRS-R-50 is a cartridge-style, time-delay fuse rated at 50 amps and classified as RK5. It is designed for general-purpose overcurrent protection in industrial and commercial electrical systems. The dual-element construction allows the fuse to carry temporary inrush current surges without nuisance opening, while still providing fast, reliable response to sustained overloads and short-circuit faults. At 27 millimeters in diameter and 5.5 inches in overall length, the FRS-R-50 installs into a standard fuse holder and is sized for use in motor branch circuits, HVAC equipment, and general distribution panels. Licensed electricians and qualified electrical technicians are the primary installers.\u003c\/p\u003e\n\u003cp\u003eThe FRS-R-50 is suited for residential, commercial, and light industrial applications where RK5-class protection is specified. Common use cases include motor branch-circuit protection for HVAC compressors, condensing units, air handlers, and pump motors where inrush current during startup would trip a standard fast-acting fuse. The time-delay characteristic makes it particularly appropriate for equipment with high locked-rotor amperage relative to running amperage. Non-indicating design means no visual blown indicator is present; a fuse tester or continuity check is required to confirm fuse condition during service.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e50-amp rating with time-delay (dual-element) construction for motor-load applications\u003c\/li\u003e\n  \u003cli\u003eRK5 fuse class — dimensionally interchangeable with RK1 fuse holders\u003c\/li\u003e\n  \u003cli\u003e20 kA interrupting capacity at DC 200 V RMS for short-circuit protection\u003c\/li\u003e\n  \u003cli\u003eNon-indicating design — no blown indicator window\u003c\/li\u003e\n  \u003cli\u003eCartridge body, 27 millimeters in diameter and 5.5 inches in length, mounts in standard fuse holder\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\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in RK5-class fuse holders accepting a cartridge fuse body of 27 millimeters in diameter and 5.5 inches in overall length. Dimensionally compatible with RK1 fuse holders of the same size class per applicable UL and CSA standards.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and replacement of branch-circuit fuses must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Always de-energize and lock out the circuit at the panel before removing or inserting a fuse. Use an insulated fuse puller rated for the voltage of the circuit — never pull a cartridge fuse by hand or with uninsulated tools. Verify the replacement fuse ampere rating and class match the circuit protection requirements 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\u003eAmperage\u003c\/strong\u003e: 50 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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Capacity\u003c\/strong\u003e: 20 kA at 200 V DC RMS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndicating\u003c\/strong\u003e: Non-Indicating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMount Type\u003c\/strong\u003e: Fuse Holder\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: 1.063 inches (27.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.31 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-50\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EATON","offers":[{"title":"Default Title","offer_id":51709962715442,"sku":"FRS-R-50","price":729.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/703b80faaca4fe770fe6bf4ab543f8a0.jpg?v=1788462599","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-frs-r-50-50a-rk5-time-delay-fuse","provider":"Voomi Supply","version":"1.0","type":"link"}