Cooper Bussmann LPJ-90SP Class J 90A Time Delay Fuse

Product Description

The COOPER BUSSMANN LPJ-90SP is a Class J time delay cartridge fuse rated at 90 amps for use in industrial and commercial electrical distribution systems. It carries an interrupt rating of 100 kA at DC and 300 kA at AC (RMS), making it suitable for high-fault-current environments. The dual-element, cartridge body design allows it to tolerate short-duration inrush currents without nuisance tripping while still providing reliable overcurrent protection. Licensed electricians and electrical contractors install this fuse in motor branch circuits, feeder protection panels, and combination motor controllers where Class J rejection is required.

This fuse is used in bolt-on fusible disconnects and Class J fuse holders in both commercial and light industrial applications. Its time delay characteristic makes it well suited for motor load circuits that draw high starting currents before settling to running amperage. The non-indicating body provides no visual blown indicator, so confirmation of fuse condition requires a continuity check or fuse tester during service. The 28.6 mm diameter and 117.5 mm overall length fit standard Class J fuse blocks designed for that form factor.

Key Features

• 90A continuous current rating with time delay dual-element design for motor inrush tolerance
• High interrupt rating: 100 kA at DC, 300 kA at AC (RMS)
• Class J cartridge form factor with bolt-on mount type
• Non-indicating body — requires tester or continuity check to confirm blown status
• RoHS compliant; CE Certified; UL Listed; CSA Certified
• Two-element construction for independent overload and short-circuit protection

Compatibility

Designed for use in Class J fuse holders and bolt-on fusible disconnect switches rated for 90A, 600V Class J fuses.

Installation Notes

Installation and replacement must be performed by a qualified electrician in accordance with NFPA 70 (NEC) requirements. Always de-energize and lockout/tagout the circuit before servicing fuse blocks or disconnect enclosures. Use an insulated fuse puller rated for the voltage class when removing or inserting cartridge fuses. Verify the replacement fuse class, amperage, and interrupt rating match the circuit requirements before energizing.