Manual Motor Starter, Horsepower @ Single Phase - 120V AC 1 hp, Horsepower @ Single Phase - 240V AC 1 hp, Maximum Voltage Rating 277V AC, Number of Poles 1, Operator Toggle Switch, Phase Single, Series Class SMF, NEMA Enclosure Rating 1, Overload Protection Type Thermal, Overall Depth 2.87 in, Overall Height 4.25 in