Pressure Switch Air Compressor and Water Pump Manual Switch Action None (1) Port 3/8 in FNPS Pressure Switch Factory On/Off Setting 140/175 psi 1/4 in Compression Pressure Switch Unloader Pressure Switch Differential 20 to 40 psi Pressure Switch Range 40 to 200 psi Pressure Switch Electrical Contact Form DPST Pressure Switch Action Standard NEMA Rating 1 Series 9013GHG HP @ 1 Phase - 120V 2 hp HP @ 1 Phase - 240V 3 hp HP @ 3 Phase - 240V 5 hp HP @ 3 Phase - 480V 5 hp