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

Product Description

The COOPER BUSSMANN LPJ-20SP is a Class J time delay cartridge fuse rated at 20 amps. It is a dual-element, general purpose fuse designed to provide overcurrent protection in industrial and commercial electrical systems. The LPJ-20SP offers a high interrupting capacity of 100 kA at DC and 300 kA at AC (RMS), making it suitable for circuits where high fault currents are a concern. At 2.25 inches in overall length and 20.6 mm in diameter, it mounts in a standard Class J fuse holder. Licensed electricians and industrial maintenance technicians install this fuse as part of panel and equipment protection schemes.

This fuse is used in commercial and industrial power distribution applications where Class J fusing is specified. The time delay characteristic allows it to ride through harmless inrush currents from motor starts and transformer energization without nuisance tripping, while still responding quickly to sustained overloads and short circuits. It is well suited for motor branch circuit protection, HVAC equipment disconnect panels, and industrial control panels requiring Class J fuse blocks.

Key Features

• 20 amp rating with time delay action for motor and transformer circuit protection
• High interrupting capacity: 100 kA at DC, 300 kA at AC (RMS)
• Dual-element cartridge construction in Class J form factor
• Non-indicating design with standard Class J fuse holder mount
• UL Listed (Guide JDDZ, File E4273), CSA Certified, CE Certified, and RoHS Compliant

Compatibility

Designed for use in standard Class J fuse holders. The LPJ-20SP conforms to Class J fuse dimensions and ratings, making it an OEM-style replacement wherever a Class J, 20 amp time delay fuse is specified.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. Always de-energize and lock out the circuit before removing or installing fuses. Verify that the fuse holder is rated for Class J cartridge fuses and that the circuit voltage and amperage do not exceed the fuse ratings. Never substitute a fuse of a different class, higher amperage, or different timing characteristic in a Class J fuse holder.