Cooper Bussmann FRS-R-150 150A RK5 Time Delay Fuse

Product Description

The COOPER BUSSMANN FRS-R-150 is a cartridge-style, time-delay fuse rated at 150 amps and classified RK5. It is designed for general-purpose overcurrent protection in industrial and commercial electrical distribution systems. The dual-element, time-delay construction allows the fuse to ride through normal motor-starting inrush currents without nuisance opening, while still responding quickly to sustained fault conditions. At 9-5/8 inches overall length and a bolt-on mount type, it installs into standard fuse blocks and disconnect switches sized for Class RK5 cartridge fuses. Licensed electricians and industrial maintenance technicians are the primary installers.

This fuse is suited for motor branch circuits, feeder protection, and general-purpose load centers in residential, commercial, and light industrial applications where Class RK5 time-delay overcurrent protection is required. The dual-element design makes it appropriate for circuits with high startup current loads such as motors, transformers, and HVAC compressors. Its 150-amp rating and standard cartridge form factor make it a direct replacement in existing bolt-on fuse holders without modification.

Key Features

• 150-amp time-delay rating handles motor inrush without nuisance trips
• Class RK5 cartridge body fits standard RK5-rated fuse blocks and disconnects
• Dual-element construction provides separate overload and short-circuit response
• Bolt-on mount type for secure, low-resistance installation
• CE Certified, CSA Certified, and UL Listed to applicable overcurrent protection standards
• 9-5/8 inch overall length conforms to ANSI cartridge fuse dimensional standards

Compatibility

Designed as an OEM-style replacement for Class RK5 cartridge fuse holders and disconnect switches rated for 150-amp, time-delay service.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Verify that the fuse holder and disconnect are rated for Class RK5 cartridges and for the voltage and amperage of the circuit. Do not substitute a fast-acting fuse in applications where a time-delay fuse is specified.