Pressure Switch, Air Compressor, Manual Switch Action Auto/Off, (1) Port, 3/8 in FNPT, Pressure Switch Factory On/Off Setting 140/175 psi, 1/4 in Compression Pressure Switch Unloader, Pressure Switch Differential 30 to 110 psi, Pressure Switch Range 60 to 232 psi, Pressure Switch Electrical Contact Form 3PST, Pressure Switch Action Standard, NEMA Rating 1, Series MDR3, HP @ 1 Phase - 120V 2 hp, HP @ 1 Phase - 240V 5 hp, HP @ 3 Phase - 240V 7 1/2 hp, HP @ 3 Phase - 480V 15 hp