Westinghouse FB4100L Shunt Trip Circuit Breaker

The Westinghouse FB4100L is a four-pole, 100 A shunt-trip molded case circuit breaker built on the FB Frame platform to provide remote emergency shutdown and four-pole overcurrent protection in industrial electrical distributions. It uses thermal-magnetic protection and is designed for panel- or switchboard-mounted installations, suitable for MCCs, switchgear, and industrial control panels where remote trip capability is required and three-phase systems with neutral protection operate at 50/60 Hz. Common applications include motor control centers, fire safety systems, conveyor equipment, HVAC infrastructure, automation machinery, and other power distribution setups needing branch circuit protection and remote disconnect. Typical replacements include Eaton FB4100L, Siemens HFB4100, and Square D FA36100.