Cooper Bussmann FRS-R-175 RK5 175A Time Delay Fuse

Product Description

The COOPER BUSSMANN FRS-R-175 is a cartridge-style, time delay fuse rated at 175 amps and classified RK5 under UL 248-12. It is designed for general-purpose overcurrent protection in industrial and commercial electrical systems where inrush current from motors, transformers, and similar loads requires a time delay characteristic before the fuse clears. The dual-element construction tolerates temporary overloads while still responding decisively to sustained fault conditions. At 9-5/8 inches overall length, this fuse fits standard bolt-on fusible disconnect and fused switch assemblies. Licensed electricians and electrical contractors are the primary installers of this component.

This fuse is suited for use in bolt-on fusible switches, motor branch circuit protection, feeder protection panels, and industrial control equipment where RK5-class protection is specified. The time delay rating makes it appropriate for motor starters and other loads that draw significant inrush current at startup. It carries CE, CSA, and UL listings, making it acceptable on projects governed by NEC requirements as well as Canadian electrical codes.

Key Features

• 175-amp rating with time delay characteristic for motor and inrush-tolerant applications
• RK5 class construction per UL 248-12 and CSA C22.2 No. 248.12
• Dual-element design handles temporary overloads without nuisance opening
• Bolt-on mount type for use in standard fusible disconnect enclosures
• CE Certified, CSA Certified, and UL Listed for broad code compliance
• 9-5/8 inch overall length fits standard RK5 fuse holders and switches

Compatibility

Designed as an OEM-style replacement for RK5-class cartridge fuse positions in bolt-on fusible disconnect switches and fused branch circuit assemblies rated for 175-amp, time delay service.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit at the upstream disconnect before removing or installing this fuse. Use properly rated fuse pullers rated for the voltage and amperage of the circuit. Verify the replacement fuse class, amperage, and voltage rating match the original equipment specifications before energizing.