Pressure Switch Air Compressor Manual Switch Action Auto/Off (1) Port 1/4 in FNPS Pressure Switch Factory On/Off Setting 120/150 psi No Pressure Switch Unloader Pressure Switch Differential 30 psi Pressure Switch Range 40 to 150 psi Pressure Switch Electrical Contact Form DPST Pressure Switch Action Standard NEMA Rating 1 Series 9013FHG HP @ 1 Phase - 120V 1 1/2 hp HP @ 1 Phase - 240V 2 hp HP @ 3 Phase - 240V 3 hp HP @ 3 Phase - 480V 1 hp Temp Range -22 Degrees to 257 Degrees F