Square D QO Miniature Circuit Breaker, Type QOU Standard Unit Mount, 240 V AC, 50 A, 50/60 Hz, 10 kA Interrupt, Thermal Magnetic Trip, 3 Pole, 3 ph, Toggle Actuator, Box Lug, 14 to 2 AWG Wire, DIN Rail/Flush Mount, 104 deg F, 2.95 in L x 2.25 in W x 4.05 in H, Black