Square D QOU330 Qo Miniature Circuit Breaker Brand: Square D. Part Number: QOU330. Square D QO Miniature Circuit Breaker, Type QOU Standard Unit Mount, 240 VAC, 30 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. Additional Description: SQD -QOU330 MINIATURE CIRCUIT BREAKER 240V 30A. Catalog Description: Mini circuit breaker, QOU, 30A, 3 pole, 240VAC, 10kA..