Cooper Bussmann LPS-RK-100SPI RK1 Time Delay Fuse 100A

Product Description

The COOPER BUSSMANN LPS-RK-100SPI is a cartridge-style, time-delay fuse rated at 100 amps and classified as RK1. 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 and transformer magnetizing currents without nuisance tripping, while still providing fast, reliable clearing of sustained overloads and short circuits. Interrupting capacity is rated at 100 kA at DC and 300 kA at AC (RMS). Overall length is 7-7/8 inches. Licensed electricians and industrial maintenance technicians are the primary installers for this class of fuse.

This fuse is suited for use in motor branch circuits, feeder circuits, and service entrance applications where RK1-class protection is specified. Bolt-on mounting makes it compatible with fusible disconnect switches and panel assemblies designed for cartridge fuse elements. The indicating feature provides a visual signal when the fuse has opened, helping technicians identify blown elements quickly during troubleshooting. Applications span commercial HVAC equipment, pumping systems, compressors, and other motor-driven loads where time-delay characteristics are required.

Key Features

• RK1 fuse class with dual-element, time-delay design for motor circuit protection
• 100 amp continuous current rating
• High interrupting capacity: 100 kA at DC, 300 kA at AC (RMS)
• Indicating type — visual blown-fuse indicator for fast field diagnosis
• Bolt-on mount compatible with standard cartridge fuse holders and disconnects
• CE Certified, CSA Certified (C22.2 No. 248.12), and UL Listed (Guide JDDZ File E4273)

Compatibility

Designed as an OEM-style replacement or new-install RK1-class cartridge fuse for fusible disconnect switches and overcurrent protection assemblies requiring a 100-amp, time-delay, bolt-on cartridge fuse of 7-7/8-inch overall length.

Installation Notes

Installation must be performed by a qualified licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Always de-energize and verify the circuit is at zero voltage using a calibrated meter before handling or replacing fuses. Use insulated fuse pullers rated for the voltage class of the installation when removing or seating cartridge fuses in a holder. Never replace a fuse with a unit of a different class, amperage, or interrupting rating than what the circuit was designed for.