Cooper Bussmann LPS-RK-70SPI RK1 Time Delay Fuse 70A

Product Description

The COOPER BUSSMANN LPS-RK-70SPI is a cartridge-style, time delay fuse rated at 70 amps and classified RK1 for high-performance overcurrent protection. It measures 7-7/8 inches overall length and features a dual-element design that provides both overload and short-circuit protection in a single body. The indicating function gives technicians a visible status signal when the fuse has opened, speeding up diagnostics without requiring additional test equipment. Interrupting capacity is rated at 100 kA DC and 300 kA AC (RMS), making it suitable for demanding industrial and commercial electrical applications. Licensed electricians and industrial maintenance technicians are the typical installers.

This fuse is used in industrial control panels, motor branch circuits, HVAC equipment disconnects, and other applications requiring a Class RK1 time delay fuse with bolt-on mounting. The time delay characteristic allows it to tolerate normal motor inrush currents without nuisance opening while still responding quickly to sustained overloads and fault conditions. Its indicating feature is particularly useful in multi-fuse panel installations where visual confirmation of fuse status reduces troubleshooting time.

Key Features

• RK1 class cartridge fuse with dual-element time delay design
• 70-amp rating with 100 kA DC and 300 kA AC (RMS) interrupting capacity
• Indicating function provides visible blown-fuse notification
• Bolt-on mount type for secure, vibration-resistant installation
• Overall length of 7-7/8 inches for standard fuse block compatibility
• CE Certified, CSA Certified, and UL Listed

Compatibility

Designed as an OEM-style replacement for Class RK1 cartridge fuse holders and fuse blocks accepting a 70-amp, 7-7/8-inch bolt-on time delay fuse.

Installation Notes

Installation should be performed by a qualified licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the circuit before replacing any fuse. Verify the fuse holder or fuse block is rated for Class RK1 cartridges and confirm the voltage and amperage ratings of the replacement fuse match the circuit requirements. Do not use a fuse with a higher amperage rating than the circuit is designed to carry.