Miniature Circuit Breaker, Amps 20, AC Voltage Rating 120/240V AC, Circuit Breaker Type Standard, Number of Poles 3, DC Voltage Rating 48V DC, Circuit Breaker Actuator Toggle, Circuit Breaker Mounting Style Surface/DIN Rail, Compatible Panelboard/Load Center Series QO, Phase 3, Series QOU, Max. AIR Rating 10kA at 120/240V AC, For Use With Air Conditioning and Refrigeration Equipment, Heating, Terminal Connection Slotted Box Lug (Reversible Line and Load), Frame Size 100A/QOU, Length 4.05 in