Cooper Bussmann FRS-R-40ID RK5 40A Time Delay Fuse

Product Description

The COOPER BUSSMANN FRS-R-40ID is a cartridge-style, time delay fuse rated at 40 amps and classified under Class RK5. It features a dual-element design that provides overload protection with a time delay, making it suitable for motor and transformer circuits where inrush current tolerance is required. The fuse is an indicating type, meaning it provides visual confirmation of a blown condition. Overall length is 5.5 inches with a body diameter of 1.06 inches. It carries a 20 kA interrupting rating at DC 200 V RMS. Licensed electricians and industrial maintenance technicians are the primary installers of this fuse type.

This fuse is designed for use in general-purpose electrical systems where Class RK5 protection is specified. Its time delay characteristic makes it well suited for circuits with motors, compressors, or other loads that draw elevated current during startup. The mount type is a fuse holder, making it compatible with standard inline and panel-mounted fuse blocks used in residential, commercial, and light industrial applications. The indicating feature simplifies fault diagnosis during routine service calls.

Key Features

• Class RK5 cartridge fuse with dual-element, time delay design
• 40 A continuous amperage rating
• Indicating type provides visual blown-fuse confirmation
• 20 kA interrupting rating at DC 200 V RMS
• Overall length of 5.5 inches, body diameter of 1.06 inches
• 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 positions in standard fuse holders and panel-mounted fuse blocks rated for this size and amperage class.

Installation Notes

Installation must be performed by a licensed electrician in accordance with NEC requirements. Always de-energize and lock out the circuit before removing or installing a fuse. Verify that the replacement fuse matches the amperage, voltage, and class rating specified on the equipment nameplate. Never substitute a fuse of a higher amperage rating to restore a tripped circuit without first identifying the fault condition.