Cooper Bussmann LPS-RK-90SP RK1 Time Delay Fuse 90A

Product Description

The COOPER BUSSMANN LPS-RK-90SP is a cartridge-style, time-delay fuse rated at 90 amps and classified as RK1. It is designed for general-purpose overcurrent protection in industrial and commercial electrical distribution systems. The fuse features a dual-element construction that provides time-delay response, allowing it to ride through normal motor-inrush and startup currents without nuisance tripping while still protecting against sustained overloads and short circuits. Rated for an interrupting capacity of 100 kA at DC and 300 kA at AC (RMS), it is suitable for high-fault-current environments. Licensed electricians and electrical contractors typically install this fuse in fusible disconnect switches and panelboards.

This fuse is suited for bolt-on mounting applications in industrial control panels, motor branch circuits, and commercial electrical distribution equipment where RK1-class overcurrent protection is required. The time-delay characteristic makes it appropriate for circuits with inductive loads such as motors, transformers, and HVAC compressor equipment. It is sold individually but carries a minimum order quantity of 3 units.

Key Features

• RK1 fuse class with dual-element, time-delay design for motor and inductive load circuits
• 90-amp rating with 100 kA interrupting capacity at DC and 300 kA at AC (RMS)
• Cartridge body type with bolt-on mount for secure installation in fusible disconnects
• Non-indicating design — no built-in blown fuse indicator
• CE Certified, CSA Certified (C22.2 No. 248.12), and UL Listed (Guide JDDZ File E4273)
• Overall length of 7-7/8 inches for standard RK1 cartridge fuse holders

Compatibility

Designed as an OEM-style replacement or new-installation fuse for bolt-on cartridge fuse holders and fusible disconnect switches that accept RK1-class cartridge fuses with a 7-7/8-inch overall length.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Use an insulated fuse puller rated for the voltage and amperage of the circuit. Verify the fuse holder is rated for RK1-class fuses and is compatible with the 7-7/8-inch cartridge length before installation.