Cooper Bussmann FRS-R-1-1/4 RK5 Time Delay Fuse 1.25A

Product Description

The COOPER BUSSMANN FRS-R-1-1/4 is a cartridge-style, time delay fuse rated at 1.25 amps and classified RK5 for general purpose overcurrent protection. The fuse measures 5 inches in overall length and 20.6 mm in overall diameter, with a two-element design that allows it to withstand temporary inrush currents without nuisance opening while still providing fast response to sustained fault conditions. It is non-indicating and mounts in a standard fuse holder. Licensed electricians and industrial maintenance technicians install this fuse type in motor branch circuits, control panels, and equipment protection applications where time delay characteristics are required.

The FRS-R-1-1/4 is suited for residential, commercial, and light industrial electrical installations where RK5 class fusing is specified. Its time delay characteristic makes it appropriate for motor loads, transformer primaries, and other circuits with high startup inrush. The fuse installs in any RK5-compatible fuse holder and is a direct fit for applications requiring a 1.25-amp, 5-inch cartridge fuse with CE, CSA, and UL listed ratings.

Key Features

• RK5 class, general purpose time delay cartridge fuse rated at 1.25 amps
• Two-element design tolerates inrush current while responding to sustained overcurrent
• Non-indicating construction for use in standard fuse holders
• CE Certified, CSA C22.2 No. 248.12 Class 1422-02 File 53787 Certified, and UL Listed 248-12 Class RK5 Guide JDDZ File E4273
• 5-inch overall length fits standard RK5 fuse holders

Compatibility

Designed as an OEM-style replacement for RK5 class cartridge fuse applications requiring a 1.25-amp, time delay, 5-inch fuse in a standard fuse holder.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the NEC and any applicable local codes. Always de-energize and lock out the circuit before removing or installing the fuse. Verify that the fuse holder is rated for RK5 class fuses and that the amperage and voltage ratings of the replacement fuse match the circuit requirements. Do not attempt to install a fuse in a live or energized holder.