Schneider Electric / Square D QOU120 Miniature Circuit Breaker; 20 Amp, 120/240 Volt AC, 1-Pole, Unit Mount Schneider Electric/Square D QOU Miniature circuit breaker has a voltage rating of 120/240 VAC, current rating of 20 Amps and interrupting rating of 10 kilo-Amps. The 1-Pole thermal/magnetic circuit breaker features a lug terminal and accommodates aluminum/copper wire size of 14 - 2 AWG. It has 35 mm DIN rail/flush/surface mounting, standard flush and provides protection against over current. It measures 0.750 Inch x 2.630 Inch x 4.050 Inch. Circuit breaker is UL listed and CSA certified.