Federal Pacific electric panel parts, FPE-5310-12-BF-100TM Circuit Breaker Type Feeder Bucket. FPE531012BF100TM Federal Pacific Type 5310 MCC, 12" H, 3PH, 100A, 600V, Includes Federal Pacific thermal magnetic molded case circuit breaker, bucket door and associated mounting hinges and screws, long-time & instantaneous trip function