Cooper Bussmann FRN-R-8ID Time Delay Fuse 8A RK5

Product Description

The COOPER BUSSMANN FRN-R-8ID is a time delay cartridge fuse rated at 8 amps in the RK5 fuse class. It features a dual-element design that tolerates harmless inrush currents while opening quickly on sustained overloads or short circuits. The fuse body measures 2 inches overall length and 0.56 inches in diameter, sized for standard RK5 fuse holders. With an interrupting rating of 20 kA at DC 200 volts RMS, it is suited for branch circuit and equipment protection in industrial and commercial electrical systems. Electricians and maintenance technicians install this fuse in fused disconnect switches, control panels, and motor branch circuits.

This fuse is used in applications requiring time delay characteristics to ride through motor starting inrush without nuisance blowing. Typical installations include HVAC equipment disconnects, motor control centers, and industrial control panels where branch circuit protection must meet NEC requirements. The indicating feature signals a blown condition for faster troubleshooting during service calls. It fits standard Class RK5 fuse holders and pull-out fuse blocks commonly found in residential, commercial, and light industrial electrical systems.

Key Features

• 8 amp time delay rating tolerates motor inrush without nuisance operation
• Class RK5 dual-element cartridge construction for reliable branch circuit protection
• 20 kA interrupting rating at DC 200 volts RMS for high fault-current environments
• Indicating design signals blown fuse status for fast field diagnosis
• Compact body at 2 inches OAL and 0.56 inches diameter fits standard RK5 holders
• CE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5

Compatibility

Designed as an OEM-style replacement for Class RK5 cartridge fuse applications. Fits standard RK5 fuse holders and pull-out fuse blocks rated for the 0.56-inch diameter, 2-inch body form factor.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC requirements for branch circuit overcurrent protection. De-energize and lock out the circuit at the disconnect or panel before removing or inserting the fuse. Use an insulated fuse puller when servicing fuse holders to avoid arc flash exposure. Verify the replacement fuse amperage, class, and voltage rating match the equipment nameplate before closing the disconnect.