Cooper Bussmann FRS-R-25 RK5 Time Delay Fuse 25A

Product Description

The COOPER BUSSMANN FRS-R-25 is a cartridge-style, time delay fuse rated at 25 amps and classified as Fuse Class RK5. Measuring 5 inches in overall length and 20.6 millimeters in diameter, it is designed for general-purpose overcurrent protection in industrial and commercial electrical systems. The dual-element construction provides time delay characteristics that allow motor inrush currents to pass without nuisance tripping, while still providing fast response to sustained overloads and short circuits. Licensed electricians and maintenance technicians install this fuse in fuse holders across a wide range of power distribution and motor circuit applications.

This fuse is suited for use in fuse holders in residential, commercial, and light industrial electrical panels and motor branch circuits where Class RK5 protection is specified. The time delay rating makes it appropriate for motor load circuits, transformer primaries, and other inductive loads that draw high inrush current at startup. Its non-indicating body means there is no external visual signal when the fuse has opened, so a continuity check is required during troubleshooting.

Key Features

• 25-amp rating with Class RK5 time delay characteristics for motor circuit protection
• Dual-element construction tolerates inrush current while responding to sustained overloads
• Overall length of 5 inches (127 millimeters) and 20.6-millimeter diameter for standard fuse holder fit
• Non-indicating body — no external blown-fuse signal
• CE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5
• Mounts in standard fuse holders — no special hardware required

Compatibility

Designed as an OEM-style replacement for Class RK5 cartridge fuse positions in standard fuse holders requiring a 25-amp, time delay, cartridge fuse.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Always de-energize the circuit and verify zero voltage with a meter before removing or installing the fuse. Use an insulated fuse puller rated for the voltage and amperage of the circuit — never remove a cartridge fuse by hand while the circuit is live. Because this fuse is non-indicating, use a multimeter to confirm continuity when diagnosing a suspected open fuse.