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

Product Description

The COOPER BUSSMANN FRN-R-25 is a cartridge-style, time-delay fuse rated at 25 amps and classified under Fuse Class RK5. It measures 2 inches (50.8 mm) in overall length and 14.3 mm in overall diameter, with a dual-element construction that delivers the time-delay characteristic essential for protecting motor circuits, HVAC compressors, and other loads with high inrush current. The non-indicating body mounts in a standard fuse holder. It carries CE, CSA, and UL listings, making it suitable for code-compliant installations across commercial and industrial applications.

This fuse is a general-purpose dual-element time-delay type intended for use in fuse holders sized for Class RK5 cartridge fuses. Typical applications include motor branch circuit protection in HVAC equipment, compressor disconnect panels, and other inductive-load circuits where nuisance tripping on startup current must be avoided. It is installed by licensed electricians and HVAC-R technicians in both commercial and residential service work. The 25-amp rating fits a broad range of equipment requiring RK5 protection.

Key Features

• Dual-element time-delay design tolerates motor inrush current without nuisance opening
• Class RK5 cartridge form factor fits standard RK5 fuse holders
• Non-indicating body in a compact 2-inch OAL, 14.3 mm diameter form factor
• CE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5
• General-purpose rated for a wide range of inductive and resistive load applications

Compatibility

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

Installation Notes

Installation must be performed by a qualified electrician in accordance with applicable NEC requirements for motor branch circuit and disconnect protection. Always de-energize and lock out the circuit before opening the fuse holder or handling the fuse. Verify the fuse holder is rated for Class RK5 cartridge fuses and that the replacement amperage matches the equipment nameplate requirement. Do not substitute a fast-acting fuse where a time-delay type is specified.