Square D (Schneider Electric) QOB330 Miniature Circuit Breaker. Square D™ Miniature Circuit Breaker Standard 240 VAC 30 A 50/60 Hz Frequency 10 kA Interrupt Thermal Magnetic Trip 3 Pole 3 ph Pressure Plate Connection 14 to 8 AWG Wire Bolt-On Mounting 104 deg F 2.91 in L x 2.25 in W x 3 in H Dimensions. Additional Description: SQD -QOB330 MINIATURE CIRCUIT BREAKER 240V 30A. Catalog Description: Square DMINIATURE CIRCUIT BREAKER 240V 30A10kA240 Vac3-Phase30AMiniature Circuit BreakerPressure Plate #14 to #8 AWG(Al/Cu)QOStandard Bolt-OnUL Listed - CSA Certified.