Schneider Electric/Square D Main circuit breaker has a voltage rating of 120/240 Volts, current rating of 150 Amps and interrupting rating of 22 kilo-Amps. The 1-Phase, 2-Pole circuit breaker features a lug terminal and accommodates aluminum/copper wire size of 4 AWG - 300 kcmil. Circuit breaker measures 5.070 Inch x 3.600 Inch x 5.600 Inch. It provides protection against over current. Circuit breaker is UL listed and CSA certified.