Square D QO330GFI Qo Qwik-Gard Miniature Circuit Breaker Brand: Square D. Part Number: QO330GFI. Square D QO Qwik-Gard Miniature Circuit Breaker, Class A Ground Fault Protecting, 240 VAC, 30 A, 10 kA Interrupt, Thermal Magnetic Trip, 3 Pole, 3 ph, Pressure Plate Connection, 14 to 8 AWG Wire, Plug-On Mounting, 104 deg F, 2.91 in L x 2.25 in W x 4.12 in H Dimensions. Additional Description: SQD -QO330GFI MINIATURE CIRCUIT BREAKER 208Y/120V 30A. Catalog Description: Mini circuit breaker, QO, 30A, 3 pole, 208Y/120VAC, 10kA, plug in, 6mA grd fault A, pigtail [TAA]..