Cooper Bussmann LPJ-70SP Class J 70A Time Delay Fuse

Product Description

The COOPER BUSSMANN LPJ-70SP is a Class J time delay cartridge fuse rated at 70 amps, designed for general purpose overcurrent protection in industrial and commercial electrical systems. It features a two-element construction that tolerates temporary inrush currents while responding decisively to sustained overloads and short circuits. The fuse carries an interrupting rating of 100 kA at DC and 300 kA AC RMS, making it suitable for high-available-fault-current installations. At 4.625 inches in length and 28.6 millimeters in diameter, it mounts via bolt-on connections. Licensed electricians and industrial maintenance technicians install this fuse in motor branch circuits, feeder panels, and disconnect switches requiring Class J form factor protection.

The LPJ-70SP is suited for residential service entrance equipment, commercial feeder circuits, and industrial motor control centers where time delay characteristics are required to ride through motor start inrush. The bolt-on mount and standardized Class J dimensions ensure straightforward installation in any UL-listed Class J fuseholder. Applications include HVAC equipment disconnect panels, pump motor branch circuits, and general-purpose load protection up to 70 amps.

Key Features

• 70A time delay rating tolerates motor inrush without nuisance opening
• High interrupting capacity: 100 kA at DC, 300 kA AC RMS for high-fault-current environments
• Two-element construction provides both overload and short-circuit protection
• Bolt-on mount for secure, low-resistance fuse holder connection
• Non-indicating design in standardized Class J cartridge form factor
• CE Certified, CSA Certified, UL Listed, and RoHS Compliant

Compatibility

Designed as a direct-fit replacement for Class J fuseholders accepting 70A time delay cartridge fuses with a 28.6 millimeter diameter and 4.625 inch overall length in bolt-on mount configurations.

Installation Notes

Installation must be performed by a qualified, licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit at the upstream disconnect before removing or installing any fuse. Verify the fuseholder is rated for Class J fuses and matches the voltage and amperage requirements of the circuit. Never replace a fuse with a higher amperage rating than the circuit is designed for.