Westinghouse Electric Corporation AQB-A-100 Circuit Breaker

The Westinghouse AQB-A-100 Circuit Breaker is a 100 Amp, vintage molded-case circuit breaker from the AQB-A series, dating to WW2-era naval equipment (1944). It provides thermal-magnetic overcurrent and short-circuit protection for high-current circuits in marine and industrial power distribution systems. Designed for panel or switchboard mounting, it is commonly installed in shipboard electrical panels, naval switchboards, military equipment, and industrial switchgear to safeguard connected equipment from overloads and faults. This device is used by maintenance teams, restoration specialists, and electrical system integrators for replacement servicing, retrofits, and legacy power system maintenance within legacy naval infrastructure. For compatibility, common replacements include Eaton Molded Case Circuit Breakers, Siemens Industrial Circuit Breakers, and Square D PowerPact Circuit Breakers.