Circuit Breaker, 20 A Amps, AC Voltage Rating 600V AC, Max. AIR Rating 65 kA at 480V AC, Circuit Breaker Type Standard, Number of Poles 1, Terminal Connection Standard Line and Load Lugs, Trip Type Thermal Magnetic, Phase Three, Instantaneous Trip Fixed, Phase Connection A, Frame Size 125A/Frame 1, Height 5.5 in, Width 2 in, Depth 2.99 in, Min. Wire Size 14 AWG, Max. Wire Size 3/0 AWG, Max. Operating Temp. 158 Degrees F, Min. Operating Temp. -4 Degrees F