{"product_id":"cooper-bussmann-frn-r-40-40a-250v-time-delay-cartridge-fuse","title":"Cooper Bussmann FRN-R-40 40A 250V Time Delay Cartridge Fuse","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe COOPER BUSSMANN FRN-R-40 is a 40-amp, 250-volt Type FRN-R time-delay cartridge fuse designed for motor-load branch circuit protection. Built on the Fusetron platform, it incorporates a dual-element construction that tolerates motor startup inrush currents without nuisance blowing while still opening fast on a true overload or short-circuit condition. The fuse measures 3 inches in length and 0.81 inches in diameter and ships in a boxed pack of 10. Licensed electricians and HVAC technicians install this fuse in disconnect boxes, motor control panels, and equipment service entrance sections where Class RK5 time-delay protection is required.\u003c\/p\u003e\n\u003cp\u003eThis fuse is commonly applied in residential and light commercial HVAC systems, pump motors, compressor circuits, and other motor-driven loads up to 250 volts AC. The time-delay characteristic makes it well suited for single-phase and three-phase motor branch circuits where the locked-rotor inrush at startup would open a standard fast-acting fuse prematurely. It fits standard Class R fuseholders and rejection-style fuse clips that accept the RK5 format.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e40-amp continuous current rating at 250 volts AC\u003c\/li\u003e\n  \u003cli\u003eDual-element time-delay design tolerates motor inrush without nuisance opening\u003c\/li\u003e\n  \u003cli\u003eType FRN-R Class RK5 rejection-style ferrule body prevents installation in non-rejection holders\u003c\/li\u003e\n  \u003cli\u003eCompact 3 inch by 0.81 inch ferrule cartridge form factor\u003c\/li\u003e\n  \u003cli\u003eSold in a boxed pack of 10 units for job-site stocking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement for Class RK5 time-delay cartridge fuse applications in standard 250-volt fusible disconnects and motor branch circuit protection panels.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation must be performed by a licensed electrician in accordance with NEC Article 240 and equipment manufacturer guidelines. Always open and lock out the disconnect switch before removing or inserting a fuse. Verify the replacement fuse amperage and voltage rating match the circuit nameplate before energizing. Do not substitute a fast-acting fuse or a non-rejection fuse in a rejection-style holder.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 40 amps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e: 250 volts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFuse Type\u003c\/strong\u003e: FRN-R Time Delay (Fusetron)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFuse Class\u003c\/strong\u003e: RK5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 0.81 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 10 per box\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.3 pounds\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: FRN-R-40\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BUSSMANN","offers":[{"title":"Default Title","offer_id":51564060049714,"sku":"FRN-R-40","price":148.87,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ff49c0e6801eea5aa67c8b8279f6a052_a8789955-3456-4d48-9d50-d614b271a718.jpg?v=1786509793","url":"https:\/\/voomisupply.com\/products\/cooper-bussmann-frn-r-40-40a-250v-time-delay-cartridge-fuse","provider":"Voomi Supply","version":"1.0","type":"link"}