Cooper Bussmann FRN-R-7-1/2 RK5 Time Delay Fuse 7.5A

Product Description

The COOPER BUSSMANN FRN-R-7-1/2 is a cartridge-style, time-delay fuse rated at 7.5 amps and classified under UL Class RK5. It features a dual-element design that tolerates harmless inrush currents while still providing reliable overcurrent protection for motor loads, transformers, and general-purpose branch circuits. The fuse body measures 2 inches in overall length and 14.3 mm in diameter, sized for standard RK5 fuse holders. Non-indicating construction means no built-in blown-fuse signal. This fuse is installed by licensed electricians working on industrial control panels, motor starters, and commercial distribution equipment.

The FRN-R-7-1/2 is suited for residential, commercial, and light industrial electrical systems where time-delay protection is required on motor branch circuits or transformer primaries. Its dual-element construction handles motor starting inrush without nuisance opening, making it a standard choice for HVAC equipment disconnects, pump panels, and control circuit protection in fused disconnect switches and panel-mount fuse holders.

Key Features

• 7.5-amp time-delay rating handles motor inrush without nuisance tripping
• UL Class RK5 classification for consistent application in code-compliant installations
• Dual-element design provides both overload and short-circuit protection
• Non-indicating body — no blown-fuse indicator
• CE Certified and CSA Certified for North American and international compliance
• Cartridge form fits standard RK5 fuse holders and fused disconnects

Compatibility

Designed as an OEM-style replacement for UL Class RK5 cartridge fuse applications. Compatible with standard RK5 fuse holders accepting a 2-inch by 14.3 mm cartridge fuse body.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the NEC and applicable local electrical codes. Always de-energize and lock out the circuit before removing or inserting a fuse. Use a properly rated fuse puller when working with cartridge fuses — do not handle energized fuses bare-handed. Verify the replacement fuse class and ampere rating match the disconnect or panel label before restoring power.