Westinghouse ABT300A2P Thermal Magnetic Trip Unit

Westinghouse AB 300 Amp 2-Pole thermal-magnetic trip unit is an internal, breaker-mounted replacement trip assembly for AB DE-ION molded case circuit breakers used in industrial and commercial electrical distribution. It delivers overcurrent and short-circuit protection via thermal-magnetic trip technology, suitable for feeders, branch circuits, and distribution equipment in motor control centers, switchgear, and power distribution layouts. Compatible with Westinghouse AB, LB, and HLB breaker frames, this 300 A trip unit is intended for replacement, retrofit, or restoration of legacy protection schemes in industrial facilities. Typical applications include industrial facilities and commercial buildings requiring calibrated, reliable breaker protection for low-voltage distribution systems.