Cooper Bussmann LPJ-8SPI Time Delay Cartridge Fuse 8A Class J

Product Description

The COOPER BUSSMANN LPJ-8SPI is a Class J time delay cartridge fuse rated at 8 amps, designed for general-purpose overcurrent protection in demanding electrical installations. It delivers an interrupting rating of 100 kA at DC and 300 kA at AC (RMS), making it suitable for circuits where high fault currents are a concern. The cartridge body measures 20.6 mm in diameter and 57.20 mm in length and mounts in a standard fuse holder. Licensed electricians and industrial maintenance technicians install this fuse in control panels, motor branch circuits, and power distribution equipment where Class J ratings are specified.

This fuse is suited for use in residential, commercial, and light industrial electrical systems where time delay characteristics are needed to ride through inrush currents without nuisance tripping. The dual-element construction separates the time delay function from the short-circuit protection function, allowing motors and transformers to start normally while still providing fast response to overloads and short circuits. It is commonly installed in fused disconnect switches, fusible panelboards, and control circuit fuse holders that accept Class J cartridge fuses.

Key Features

• Class J cartridge fuse with time delay characteristics for motor and transformer circuit protection
• 8 amp rating with 100 kA DC and 300 kA AC (RMS) interrupting capacity
• Dual-element construction separates overload time delay from short-circuit response
• Indicating type provides visual confirmation of a blown fuse
• Compact cartridge body: 20.6 mm diameter, 57.20 mm length — fits standard Class J fuse holders
• Meets CE, CSA 22.2 No.248, CSA Class 1422-02, RoHS, and UL Listed (Guide JDDZ File E4273) requirements

Compatibility

Designed as an OEM-style replacement for Class J cartridge fuse positions in standard fuse holders and fusible disconnects that accept Class J time delay fuses rated at 8 amps.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before replacing a fuse. Verify that the replacement fuse class, amperage, and voltage rating match the original fuse and the circuit requirements. Do not substitute a non-time-delay fuse in circuits where the time delay characteristic is specified for motor or transformer inrush protection.