Cooper Bussmann LPJ-7SPI Class J Time Delay Fuse 7A

Product Description

The COOPER BUSSMANN LPJ-7SPI is a Class J time delay cartridge fuse rated at 7 amps, designed for general-purpose overcurrent protection in commercial and industrial electrical systems. The time delay characteristic allows the fuse to withstand brief inrush currents without nuisance opening, while still responding quickly to sustained fault conditions. This is a dual-element, indicating fuse, meaning it provides a visible signal when it has opened. At 20.6 mm in diameter and 57.2 mm in overall length, it fits standard Class J fuse holders. Licensed electricians and industrial maintenance technicians are the typical installers.

The LPJ-7SPI is suited for motor branch circuit protection, transformer primaries, and other loads where temporary current surges are expected during startup. Its Class J rating places it in a high-interrupting-capacity category, with an interrupting rating of 300 kA at AC (RMS) and 100 kA at DC. This makes it appropriate for use in panels and equipment where available fault current levels are elevated, such as in commercial buildings, light industrial facilities, and equipment control panels requiring certified overcurrent protection.

Key Features

• Class J cartridge form factor fits standard Class J fuse holders
• Time delay design handles motor inrush and transformer magnetizing currents without nuisance tripping
• Dual-element construction provides both overload and short-circuit protection
• Indicating feature provides visible confirmation when the fuse has opened
• 300 kA interrupting rating at AC (RMS) supports high available fault current environments
• Certified to UL, CSA, CE, and RoHS standards for broad application compliance

Compatibility

Designed for use in standard Class J fuse holders accepting 20.6 mm diameter cartridge fuses with a 57.2 mm overall length.

Installation Notes

Installation must be performed by a qualified licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lockout/tagout the circuit before removing or installing any fuse. Verify that the fuse holder is rated for Class J fuses and that the replacement amperage matches the circuit's overcurrent protection requirements. Do not substitute a fuse of a higher amperage rating than specified by the equipment manufacturer or circuit design.