Cooper Bussmann FRS-R-10 RK5 Time Delay Fuse 10A

Product Description

The COOPER BUSSMANN FRS-R-10 is a cartridge-style, time-delay fuse rated at 10 amps and classified as RK5 for general-purpose overcurrent protection. It measures 5 inches in overall length and 20.6 mm in diameter, fitting standard fuse holders designed for that form factor. The dual-element construction allows the fuse to tolerate brief inrush currents without nuisance opening, while still responding quickly to sustained overloads and fault conditions. Licensed electricians and maintenance technicians install this fuse in motor branch circuits, HVAC equipment controls, and industrial power distribution panels where RK5-class protection is specified.

This fuse is suited for residential and light commercial electrical systems where time-delay overcurrent protection is required. Its cartridge body seats in a standard RK5-rated fuse holder, making it appropriate for retrofit and service work in motor circuits, transformer primaries, and control panels. The non-indicating design means no external visual signal is provided when the fuse opens, so a continuity check is required during troubleshooting to confirm fuse condition.

Key Features

• RK5 class, dual-element time-delay design tolerates motor inrush without nuisance trips
• 10-amp rating suitable for small motor branch circuits and control-panel protection
• 5-inch overall length and 20.6 mm diameter for standard cartridge fuse holder mounting
• Non-indicating fuse body keeps form factor compact in tight panel installations
• CE Certified, CSA C22.2 No. 248.12 certified, and UL Listed 248-12 Class RK5

Compatibility

Designed as an OEM-style replacement for RK5-class cartridge fuse holders rated for 10-amp time-delay applications in general-purpose electrical circuits.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit before removing or installing the fuse. Confirm the fuse holder is rated for RK5-class fuses and matches the voltage and amperage of this device. Because this is a non-indicating fuse, use a multimeter or fuse tester to verify continuity before assuming the fuse is the fault source.