Square D QOB120VH1021 Qo Miniature Circuit Breaker Brand: Square D. Part Number: QOB120VH1021. Square D QO Miniature Circuit Breaker, Type QOB-VH Standard, 120/240 V AC, 20 A, 50/60 Hz Frequency, 22 kA Interrupt, Thermal Magnetic Trip, 1 Pole, 1 ph, Pressure Plate Connection, 14 to 8 AWG Wire, Bolt-On Mounting, 40 deg C, 2.91 in L x 1.5 in W x 3 in H Dimensions, Fiberglass Filled Thermoset. Additional Description: SQD -QOB120VH1021 MINIATURE CIRCUIT BREAKER 120/240V 20A. Catalog Description: Mini circuit breaker, QO, 20A, 1 pole, 120/240VAC, 22kA, bolt on, AC shunt..