Cooper Bussmann LPJ-20SPI 20A Class J Time Delay Fuse

Product Description

The COOPER BUSSMANN LPJ-20SPI is a Class J time delay cartridge fuse rated at 20 amps, designed for general purpose overcurrent protection in demanding electrical systems. This dual-element fuse tolerates temporary inrush currents without nuisance tripping while responding rapidly to sustained fault conditions. It carries an interrupting rating of 100 kA at DC and 300 kA at AC (RMS), making it suited for high-fault-current environments. The indicating feature provides a visual confirmation of a blown fuse, speeding up troubleshooting during service calls. Licensed electricians and industrial maintenance technicians are the primary installers of this fuse type.

The LPJ-20SPI fits into Class J fuse holders and is appropriate for use in motor branch circuits, control panels, and industrial equipment where time delay characteristics are needed to ride through motor starting inrush. The cartridge body measures 20.6 mm in diameter and 57.20 mm in overall length, consistent with standard Class J dimensions. It is well suited for commercial and light industrial applications where high interrupting capacity and compact form factor are both required.

Key Features

• 20-amp Class J time delay rating handles motor inrush without nuisance tripping
• Dual-element construction provides both time delay and fast-acting fault response
• High interrupting capacity: 100 kA at DC, 300 kA at AC (RMS)
• Indicating design gives visible blown-fuse confirmation at the fuse body
• Compact cartridge form: 20.6 mm diameter, 57.20 mm overall length
• UL Listed, CSA Certified, CE Certified, and RoHS Compliant

Compatibility

Designed for use in Class J fuse holders with a mount type fuse holder configuration. Confirm holder ampere rating, voltage rating, and physical dimensions match before installation.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit before opening any fuse holder or panel. Verify the replacement fuse ampere rating, class, and voltage rating exactly match the circuit requirements before inserting. Do not use a fuse of a higher ampere rating as a substitute for a properly sized protective device.