Cooper Bussmann LPJ-100SP Class J 100A Time Delay Fuse

Product Description

The COOPER BUSSMANN LPJ-100SP is a Class J time delay cartridge fuse rated at 100 amps, designed for general-purpose overcurrent protection in industrial and commercial electrical systems. With a dual-element construction, it tolerates harmless temporary overloads and motor inrush currents while responding quickly to sustained faults. The fuse is rated for 100 kA interrupting capacity at DC and 300 kA at AC (RMS), making it appropriate for high-fault-current environments. It installs in bolt-on fuseholders and is a non-indicating type. Licensed electricians and industrial maintenance technicians are the primary installers.

This fuse is used in motor branch circuits, feeder panels, and industrial control panels where Class J fuse dimensions and time delay characteristics are required. The 100-amp rating makes it suitable for medium-sized motor loads and distribution equipment in both commercial and light industrial settings. Its compact cartridge form factor fits standard Class J fuseholders commonly found in disconnect switches and panelboards.

Key Features

• 100A time delay rating tolerates motor inrush without nuisance blowing
• Dual-element design distinguishes temporary overloads from hard faults
• 300 kA interrupting capacity at AC (RMS) for high-fault-current installations
• 100 kA interrupting capacity at DC
• Bolt-on mount type for secure, low-resistance termination
• Non-indicating design — no visual blown indicator

Compatibility

Designed as an OEM-style replacement for Class J bolt-on fuseholders used in general-purpose industrial and commercial overcurrent protection applications.

Installation Notes

Installation must be performed by a licensed electrician in accordance with applicable NEC requirements for Class J fuse installations. De-energize and lock out the circuit before removing or replacing any fuse. Verify that the fuseholder is rated for Class J fuses and that the voltage and amperage ratings of the fuseholder meet or exceed those of this fuse. Do not attempt to service fuses under load.