Cooper Bussmann FRN-R-6 Cartridge Time Delay Fuse RK5 6A

Product Description

The COOPER BUSSMANN FRN-R-6 is a Class RK5 cartridge-style time delay fuse rated at 6 amps, designed for general-purpose overcurrent protection in commercial and industrial electrical systems. The dual-element, time delay design allows the fuse to ride through harmless temporary inrush currents — such as motor starting surges — without nuisance opening, while still providing reliable protection against sustained overloads and short circuits. At 20 kA interrupting capacity, it handles demanding fault conditions. Electricians and maintenance technicians install this fuse in fuse holders where Class RK5 protection is specified by the system designer or NEC requirements.

This fuse is suited for motor branch circuits, HVAC equipment disconnect protection, and general electrical distribution panels where time delay overcurrent protection is required. The cartridge body measures 2 inches in overall length with a 0.563-inch diameter, fitting standard Class RK5 fuse holders. It is used in both new construction and service replacement applications across residential, light commercial, and industrial installations where Class RK5-rated fusing is called for.

Key Features

• Class RK5 time delay rating accommodates motor inrush without nuisance trips
• Dual-element construction provides both overload and short-circuit protection
• 20 kA interrupting capacity at DC 200 V RMS for demanding fault environments
• Non-indicating design with cartridge body for use in standard fuse holders
• CE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5

Compatibility

Designed as an OEM-style replacement for Class RK5 cartridge fuse applications requiring a 6-amp time delay fuse in a standard fuse holder.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the NEC and applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Verify the fuse holder is rated for Class RK5 cartridge fuses before installation. Do not attempt to replace a fuse in an energized panel.