Circuit breakers protect the wires in your home from overheating (referred to as an overload) and fault currents (referred to as short circuits). The Eaton Cutler-Hammer Quadplex or Quad type Circuit Breaker is designed to create (4) circuits in (2) spaces. This allows for 240-Volt circuits. The BQC style breaker has a common trip as well as a rejection tab feature. These breakers are designed for use in BR type load centers and should be installed only in panel positions that have notched bus stabs that accommodate the rejection clip. Also, BQC circuit breakers are UL approved genuine replacement breakers for load centers made by Westinghouse, Challenger and Bryant.