Molded Case Circuit Breaker, 40 A Amps, AC Voltage Rating 277V AC, Max. AIR Rating 25kA at 120/240V AC, For Use With Electrical Distribution Equipment, Industrial Control Panels, Series BDA, Circuit Breaker Type Standard, Number of Poles 1, DC Voltage Rating Not Rated, Terminal Connection Al Mechanical Lug OFF End, I-Line ON End, Trip Type Thermal Magnetic, Phase Single, Instantaneous Trip Fixed, Phase Connection A, Frame Size 125A/BD, Circuit Breaker Mounting Style I-Line, Height 9.7 in