Cooper Bussmann FRN-R-17-1/2ID Time Delay Fuse 17.5A RK5

Product Description

The COOPER BUSSMANN FRN-R-17-1/2ID is a time delay cartridge fuse rated at 17.5 amps and classified as UL Class RK5. It is designed for general-purpose overcurrent protection in industrial and commercial electrical systems. The cartridge body measures 2 inches in overall length and 0.56 inches in diameter, fitting standard fuse holders. With a dual-element construction and an interrupting rating of 20 kA at DC 200 volts RMS, this fuse provides reliable protection against both overload and short-circuit conditions. Licensed electricians and qualified maintenance technicians install this fuse in distribution panels, motor circuits, and equipment branch circuits.

This fuse is suited for applications requiring time delay characteristics, allowing motors and transformers to handle inrush current without nuisance tripping. It is appropriate for residential, commercial, and light industrial branch circuit protection where Class RK5 rejection-style fusing is specified. The indicating feature provides a visible signal when the fuse has opened, aiding in fast fault diagnosis during service calls.

Key Features

• 17.5-amp time delay rating handles motor inrush without nuisance tripping
• Class RK5 dual-element cartridge construction for overload and short-circuit protection
• 20 kA interrupting rating at DC 200 volts RMS
• Indicating feature provides visible blown-fuse indication
• Mounts in standard fuse holders — no special tooling required
• CE Certified, CSA Certified, and UL Listed to applicable standards

Compatibility

Designed as an OEM-style replacement for Class RK5 cartridge fuse applications using standard fuse holders sized for 2-inch by 0.56-inch cartridge fuses.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit before removing or installing fuses. Use an insulated fuse puller rated for the voltage and current of the circuit. Verify that the replacement fuse amperage and class match the original overcurrent protection device specified for the circuit.