Bussmann JJN-300 Class T Fuse

The Bussmann JJN-300 Class T fuse is a 300-amp, 300-volt fast-acting current-limiting fuse from Eaton’s Bussmann Series (TRON Fast Acting). It is non-indicating and features bolted blade ends for secure mounting in high-current power circuits. This Class T device protects power electronics and drive systems by quickly interrupting fault currents while remaining stable under normal operation. Key specifications include an interrupting capacity of 200 kAIC at 300 VAC and 20 kAIC at 160 VDC, making it suitable for 300 VAC-class installations that may include inverter stages and motor-control circuitry. The JJN-300 is cataloged as BUSJJN300 for procurement purposes and is designed for use in applications where fast fault clearance is essential, such as inverter feeds and VFD power lines in industrial equipment.