Cooper Bussmann LPS-RK-15SP RK1 Time Delay Fuse 15A

Product Description

The COOPER BUSSMANN LPS-RK-15SP is a Class RK1 cartridge time delay fuse rated at 15 amps, designed for general-purpose overcurrent protection in industrial and commercial electrical systems. With an overall length of 5 inches (127 mm) and a body diameter of 20.6 mm, this fuse mounts in a standard fuse holder and features a dual-element construction that provides time delay characteristics. The LPS-RK-15SP carries an interrupting rating of 100 kA at DC and 300 kA at AC (RMS), making it suitable for circuits with high available fault current. Licensed electricians and industrial maintenance technicians are the primary installers of this fuse type.

This fuse is intended for use in branch circuit and feeder protection applications where a time delay is needed to ride through motor inrush currents or transformer magnetizing currents without nuisance tripping. Its RK1 class rating means it meets the more stringent dimensional and performance requirements compared to Class RK5, offering a higher degree of current limitation. It is suitable for residential service entrances, commercial panel boards, and industrial control panels where 15-amp overcurrent protection is required.

Key Features

• Class RK1 rating provides superior current-limiting performance compared to standard fuse classes
• Dual-element, time delay design accommodates temporary overloads such as motor starting inrush
• 100 kA DC and 300 kA AC (RMS) interrupting ratings for high fault current environments
• Non-indicating body — no visual blown indicator
• Mounts in standard cartridge fuse holders
• CE Certified, CSA Certified (C22.2 No. 248.12), and UL Listed (Guide JDDZ File E4273)

Compatibility

Designed as an OEM-style replacement for Class RK1 cartridge fuse applications requiring a 15-amp, time delay, general-purpose fuse in a standard fuse holder.

Installation Notes

Installation should be performed by a licensed 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 a fuse. Verify that the fuse holder is rated for Class RK1 cartridge fuses and that the circuit voltage and current ratings are within the fuse specifications before installation. Never replace a blown fuse without first identifying and correcting the cause of the overcurrent condition.