Cooper Bussmann LPS-RK-20SP RK1 Time Delay Fuse 20A

Product Description

The COOPER BUSSMANN LPS-RK-20SP is a Class RK1 cartridge-style time delay fuse rated at 20 amps for use in industrial and commercial electrical systems. It measures 5 inches in overall length and 20.6 mm in diameter, fitting standard RK1 fuse holders. The dual-element, time delay design allows momentary overloads — such as motor inrush currents — to pass without nuisance opening, while still providing fast, reliable protection against sustained overcurrents and short circuits. With an interrupting rating of 100 kA at DC and 300 kA at AC (RMS), this fuse is suited for high-fault-current environments. Licensed electricians and industrial maintenance technicians are the primary installers.

This fuse is used in commercial and industrial electrical panels, motor control centers, and equipment disconnect applications where Class RK1 current-limiting protection is required. The time delay characteristic makes it appropriate for circuits serving motors, transformers, and other loads with high inrush demand. It mounts in a standard fuse holder and is sold individually, with a minimum order quantity of 10 units.

Key Features

• Class RK1 current-limiting cartridge fuse with dual-element time delay design
• 20-amp rating with 100 kA DC and 300 kA AC (RMS) interrupting capacity
• 5-inch overall length and 20.6 mm diameter for standard RK1 fuse holder mounting
• Non-indicating design — no visual blown indicator
• CE Certified, CSA Certified (C22.2 No. 248.12), and UL Listed (Guide JDDZ, File E4273)
• General purpose application across motor, transformer, and panel feeder circuits

Compatibility

Designed for use in standard Class RK1 fuse holders in commercial and industrial electrical distribution and motor control applications. Verify fuse holder accepts RK1 class cartridge fuses rated 20 amps before installation.

Installation Notes

Installation must be performed by a qualified licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lockout/tagout the circuit before removing or replacing a fuse. Use an appropriately rated fuse puller for cartridge fuse removal — do not handle live fuses by hand. Confirm the replacement fuse class, amperage, and voltage rating match the circuit and equipment requirements before energizing.