Cooper Bussmann FRN-R-50 RK5 Time Delay Fuse 50A

Product Description

The COOPER BUSSMANN FRN-R-50 is a cartridge-style, time-delay fuse rated at 50 amps in the Class RK5 designation. It measures 3 inches in overall length and 0.81 inches in diameter, and it mounts in a standard fuse holder. The dual-element construction delivers time-delay characteristics that allow temporary overloads, such as motor inrush current, to pass without nuisance opening, while still responding quickly to sustained fault conditions. Licensed electricians and HVAC technicians install this fuse as overcurrent protection in motor branch circuits, HVAC equipment, and industrial control panels. It carries CE, CSA, and UL listings for broad code compliance.

This fuse is suited for residential and light commercial applications where Class RK5 overcurrent protection is required. Typical installations include motor circuits, compressor disconnect boxes, HVAC unit disconnects, and other equipment requiring time-delay fusing to handle inrush loads. The dual-element design makes it appropriate for inductive loads where a fast-blow fuse would open unnecessarily during startup. It seats in any standard Class RK5-rated fuse holder or disconnect switch configured for that class.

Key Features

• 50-amp time-delay rating handles motor inrush without nuisance trips
• Class RK5 dual-element construction for inductive load protection
• Cartridge body fits standard RK5 fuse holders and disconnect switches
• Non-indicating design keeps installation simple and cost-effective
• UL Listed 248-12 Class RK5, CSA C22.2 No. 248.12, and CE Certified
• 20 kA DC interrupt rating at 200 volts RMS provides robust fault clearing capacity

Compatibility

Designed for use in standard Class RK5 fuse holders and disconnects requiring a 50-amp, time-delay cartridge fuse.

Installation Notes

Installation must be performed by a licensed 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. Verify that the fuse holder is rated for Class RK5 and that the replacement fuse matches the amperage and voltage rating of the original. Never install a fuse with a higher amperage rating than the circuit is designed to carry.