The QO 20 Amp 1-1/2 in. Double-Pole Circuit Breaker is designed to provide overload and short-circuit protection of your home"s electrical system. The breaker unit features the Visi-Trip indicator to easily identify a tripped circuit in the load center. This circuit breaker is for use in QO load centers, QO enclosures, CSED devices and NQOD panel boards.