Cooper Bussmann BP/FRN-R-45 Cartridge Fuse 45A 250V

Product Description

The COOPER BUSSMANN BP/FRN-R-45 is a Type FRN-R time-delay cartridge fuse rated at 45 amps and 250 volts. It uses a Fusetron time-delay design that tolerates harmless temporary overloads — such as motor inrush current — while still opening quickly on sustained faults and short circuits. The fuse measures 2.375 inches long by 1.375 inches wide by 0.50 inches high and is sold in a carded 2-pack. Electricians and HVAC technicians install this fuse in disconnect boxes, load centers, and equipment panels where motor-load protection is required.

This fuse is suited for residential and light commercial applications where motor circuits, HVAC compressors, condensing units, and similar inductive loads are protected at 250 volts or below. The time-delay characteristic prevents nuisance tripping during startup surges while providing reliable overcurrent protection during abnormal conditions. The carded 2-pack format is convenient for field service and stocking a service van.

Key Features

• 45A continuous current rating at 250 volts AC
• Fusetron time-delay design handles motor inrush without nuisance opening
• Type FRN-R rejection-style ferrule body prevents cross-insertion of non-time-delay fuses
• Compact cartridge form factor: 2.375 inches L x 1.375 inches W x 0.50 inches H
• Sold as a carded 2-pack for convenient field use

Compatibility

Designed as an OEM-style replacement for Type FRN-R time-delay cartridge fuse holders rated at 250 volts, commonly found in residential and light commercial HVAC disconnect and motor-circuit applications.

Installation Notes

Installation must be performed by a qualified electrician or licensed HVAC technician in accordance with NEC requirements for motor-circuit protection. Always shut off and lock out the disconnect or panel before replacing fuses. Verify the replacement fuse ampere rating and voltage rating match the equipment nameplate before re-energizing. The Type FRN-R rejection ferrule prevents substitution with non-time-delay Class H fuses, so confirm holder compatibility before installation.