Cooper Bussmann LPJ-1-1/4SP Class J Fuse 1.25A

Product Description

The COOPER BUSSMANN LPJ-1-1/4SP is a Class J time-delay cartridge fuse rated at 1.25 amps for general-purpose overcurrent protection. It features a dual-element design that tolerates brief inrush currents without nuisance opening while still providing fast, reliable response to sustained overloads and short-circuit faults. With an interrupting rating of 300 kA at AC (RMS) and 100 kA at DC, this fuse is suited for circuits where high available fault current is a design consideration. The cartridge body measures 20.60 mm in diameter and 57.20 mm in length and mounts in a standard Class J fuse holder. Licensed electricians and industrial maintenance technicians are the primary installers.

This fuse is applied in commercial and industrial electrical panels, motor control centers, power distribution equipment, and HVAC control circuits requiring Class J fuse protection. The time-delay characteristic makes it appropriate for motor branch circuits and transformer primary protection where startup inrush must be accommodated. It is sold individually but carries a minimum order quantity of 10 units, making it practical for panel builds and service stock replenishment.

Key Features

• Class J time-delay dual-element design tolerates motor inrush without nuisance opening
• 300 kA interrupting rating at AC (RMS) and 100 kA at DC for high-fault-current circuits
• 1.25-amp rating for low-amperage branch circuit and control circuit protection
• Cartridge body: 20.60 mm diameter, 57.20 mm overall length — fits standard Class J fuse holders
• Non-indicating body for cost-effective general-purpose applications
• RoHS compliant; UL Listed, CSA Certified, CE Certified

Compatibility

Designed for use in standard Class J fuse holders. Verify holder ampere rating and voltage rating are consistent with the circuit being protected before installation.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit before removing or inserting any fuse. Confirm the fuse holder is rated for Class J fuses and that the circuit voltage does not exceed the fuse voltage rating. Do not substitute a higher-amperage fuse to resolve nuisance opening — diagnose the underlying load condition first.