Cooper Bussmann FRS-R-17-1/2 RK5 Time Delay Fuse 17.5A

Product Description

The COOPER BUSSMANN FRS-R-17-1/2 is a cartridge-style, time delay fuse rated at 17.5 amps and classified as RK5. It is designed for general-purpose overcurrent protection in industrial and commercial electrical systems. The fuse features a dual-element construction that tolerates temporary motor inrush currents while still protecting against sustained overloads and short circuits. At 5 inches in overall length and 20.6 millimeters in diameter, it fits standard RK5-class fuse holders. Licensed electricians and maintenance technicians install this fuse in motor branch circuits, control panels, and distribution equipment where time delay characteristics are required.

This fuse is suited for motor load circuits, HVAC equipment, compressors, and other applications where startup current surges must be accommodated without nuisance tripping. The RK5 class designation indicates it meets the dimensional and performance requirements for that fuse category, making it appropriate for use in commercial and light industrial panel installations. It carries CE, CSA, and UL listings, supporting use in a range of North American and international project specifications.

Key Features

• Time delay dual-element design tolerates motor inrush without nuisance opening
• RK5 class cartridge body — 5 inches long, 20.6 millimeters in diameter
• Rated 17.5 amps for precise branch circuit protection
• Non-indicating construction — no visual blown indicator
• CE Certified, CSA C22.2 No. 248.12 Certified, and UL Listed 248-12 Class RK5
• Mounts in standard fuse holders; no special tooling required for installation

Compatibility

Designed as an OEM-style replacement for RK5-class cartridge fuse positions in standard fuse holders rated for 5-inch cartridge fuses.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Use an approved fuse puller rated for the cartridge size when extracting fuses from live-adjacent holders. Verify the replacement fuse amperage and class match the original equipment manufacturer specifications before reinstalling.