Westinghouse FB3125 Molded Case Circuit Breaker

The Westinghouse FB3125 is a 125 Amp, 3-pole molded case circuit breaker designed for three-phase overcurrent protection in industrial power systems up to 600 V. Built on the FB Frame with thermal-magnetic protection, it is panel- or switchboard-mounted to protect branch circuits and equipment in motor control centers, switchgear, and industrial control panels, with common replacements including Eaton FB3125, Siemens HFB3125, and Square D FA34125. Rated for 50/60 Hz operation, this device is used in industrial and commercial installations such as conveyors, HVAC infrastructure, automation systems, and other high-amperage equipment requiring dependable three-phase protection.