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

Product Description

The COOPER BUSSMANN LPS-RK-20SPI is a Class RK1 cartridge time delay fuse rated at 20 amps for use in industrial and commercial electrical systems. This dual-element, indicating fuse provides time delay protection that distinguishes between temporary motor inrush currents and sustained fault conditions, tripping only on genuine overloads or short circuits. At 5 inches overall length and 20.6 mm diameter, it mounts in a standard fuse holder. The indicating feature gives technicians a visual confirmation of a blown fuse, speeding up troubleshooting. Certified to UL, CSA, and CE standards, this fuse is suited for branch circuit and feeder protection in demanding service environments.

This fuse is used in commercial and industrial electrical panels, motor control centers, and distribution equipment where Class RK1 time delay protection is required. The dual-element design handles motor starting loads without nuisance tripping while providing fast response to short circuit faults. Electricians and maintenance technicians working on equipment such as HVAC units, pumping systems, and industrial machinery commonly specify this fuse class for reliable overcurrent protection in high-demand applications.

Key Features

• Class RK1 dual-element time delay design handles motor inrush without nuisance tripping
• 20 amp rating with 100 kA interrupting capacity at DC and 300 kA at AC (RMS)
• Indicating feature provides visual confirmation of a blown fuse
• 5 inches overall length, 20.6 mm diameter — fits standard cartridge fuse holders
• Certified to UL Guide JDDZ File E4273, CSA C22.2 No. 248.12, and CE

Compatibility

Designed for use in standard cartridge fuse holders accepting Class RK1 time delay fuses with a 5-inch overall length and 20.6 mm diameter body.

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 replacing a fuse. Use a properly rated fuse puller when removing cartridge fuses from a live-rated holder — never use bare hands or uninsulated tools. Confirm the replacement fuse class, amperage, and voltage rating match the circuit requirements before restoring power.