Westinghouse Electric Corporation FDB3150 Circuit Breaker

The Westinghouse FDB3150 is a 150 Amp, 3‑pole molded‑case circuit breaker with an auxiliary switch designed for 600 V industrial power distribution and control systems. It uses thermal magnetic overcurrent protection to guard three‑phase equipment, while the auxiliary contact provides breaker status indication and remote signaling. Typically installed in motor control centers, switchboards, and industrial automation panels, it protects high‑amperage loads in MCCs, conveyors, HVAC infrastructure, and other processing or automation equipment powered from 600 V. This device is part of the Westinghouse FDB frame, supports panel or switchboard mounting, and operates at 50/60 Hz. Common replacements include Eaton FDB3150, Siemens HFD3150, and Square D FA34150.