This QO load center accessory has one space for a single phase breaker. QON OEM mounting bases are for the mounting QO and QO GFI plug on circuit breakers. This base accepts breakers up to 70A, 120VAC. This product meets CSA standards. Specifications Main Product Type Mounting base Marketing Trade Name QO Load Center Type Main lugs Rated Current 70 A Number of Spaces 1 Max Short Circuit Current Rating 10 kA Maximum Number of Single Pole Circuits 1 Maximum Number of Tandem Breakers 0 Number of Phases 1 phase 2 wires Voltage Rating 120 V AC Complementary Wire Size 14 AWG...4 AWG copper 14 AWG...2 AWG aluminum Ground Bar Grounding bar (ordered separately) Product Certifications CSA UL listed Tightening Torque 35 lb.in, 14 AWG...4 AWG, copper 35 lb.in, 14 AWG...2 AWG, aluminum Circuit Breaker Type QO Mounting Mode Plug-on Height 1.0 in (25 mm) Width 4.02 in (102 mm) Depth 5 in (127 mm) Net weight 0.108 lb(US) (0.049 kg)