Cooper Bussmann FRS-R-5 RK5 Time Delay Fuse 5A

Product Description

The COOPER BUSSMANN FRS-R-5 is a cartridge-style, time-delay fuse rated at 5 amps and classified 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 RK5 cartridge fuses. The dual-element, time-delay design tolerates brief inrush currents — such as those produced by motor starts — without nuisance opening, while still responding quickly to sustained overloads and short-circuit faults. This fuse is installed by licensed electricians and qualified technicians in panel boards, disconnect switches, and inline fuse holders across commercial and light industrial applications.

The FRS-R-5 is suited for general-purpose branch circuit and equipment protection where RK5 time-delay performance is specified. Typical applications include motor branch circuits, HVAC equipment disconnects, and control panel protection in both commercial and light industrial settings. The non-indicating body provides no visual blown-fuse signal, so verification requires a fuse tester or multimeter during troubleshooting. It mounts in any standard RK5-rated fuse holder.

Key Features

• 5-amp rating with time-delay (dual-element) design for motor and inductive load protection
• RK5 fuse class — fits standard RK5 cartridge fuse holders
• 5-inch overall length, 20.6 mm diameter for drop-in cartridge replacement
• Non-indicating body — no visual blown indicator
• CE Certified, CSA C22.2 No. 248.12 Class 1422-02 File 53787 Certified, and UL Listed 248-12 Class RK5 Guide JDDZ File E4273

Compatibility

Designed for use in RK5-rated cartridge fuse holders. Suitable as a direct replacement in any application specifying a Class RK5 time-delay cartridge fuse at 5 amps.

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 a fuse. Confirm the fuse holder is rated for Class RK5 cartridge fuses before installation. Do not substitute a different fuse class or a higher ampere rating as a replacement.