Cooper Bussmann JJN-45 Class T Cartridge Fuse 45A

Product Description

The COOPER BUSSMANN JJN-45 is a Class T fast-acting cartridge fuse rated at 45 amps, designed for general-purpose overcurrent protection in electrical distribution systems. It measures 0.875 inches in overall length and 0.563 inches in diameter, making it a compact, high-performance protective device. The JJN-45 carries an interrupting capacity of 200 kA at AC (RMS) and 20 kA at DC, providing substantial fault-current protection in demanding installations. Licensed electricians and electrical contractors install this fuse in panelboards, disconnects, and fusible equipment where Class T ratings are required.

This fuse is suited for residential, commercial, and light industrial electrical installations where Class T fast-acting overcurrent protection is specified. Its compact cartridge form factor fits standard Class T fuse blocks and holders. Applications include branch-circuit and feeder protection in switchboards, load centers, and motor-control equipment. The fast-acting response characteristic makes it appropriate for protecting equipment that does not require time-delay characteristics during motor starting or inrush conditions.

Key Features

• 45-amp rating in a compact Class T cartridge body
• High interrupting capacity: 200 kA at AC (RMS) and 20 kA at DC
• Fast-acting fuse timing for rapid overcurrent response
• Overall length of 0.875 inches and body diameter of 0.563 inches
• CE Certified, CSA C22.2 No. 248.15 Class 1422-02 File 53787 Certified, and UL Listed 248-15 Class T Guide JDDZ File E4273

Compatibility

Designed as a direct-fit replacement for standard Class T fuse holders and blocks rated to accept 45-amp cartridge fuses with a 0.563-inch diameter body.

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 lock out the circuit before removing or installing any fuse. Use insulated fuse pullers rated for the voltage and amperage of the circuit. Verify the fuse holder is rated for Class T fuses and matches the ampere and voltage requirements of the application before installation.