Westinghouse Cutler-Hammer LB3400 Circuit Breaker

Westinghouse Cutler-Hammer LB3400 is a 3-pole, 400-amp Type LB circuit breaker designed for thermal overcurrent protection. This model is described as a thermal-type device within the LB3400 series, featuring three interrupting poles and a 400 A rating that supports protection of multi-conductor circuits. When an overload or fault occurs, the breaker interrupts current across all conductors to protect connected wiring and equipment from damage, helping to prevent insulation failure and electrical fires. The LB3400 is part of the Westinghouse Cutler-Hammer LB product line, identified by the Type LB classification and the LB3400 model designation. The model designation LB3400 captures its 3-pole configuration, 400-amp rating, and thermal protection characteristic.