Pressure Switch Air Compressor Manual Switch Action Auto/Off (1) Port 3/8 in FNPT Pressure Switch Factory On/Off Setting 60/80 psi 1/4 in Compression Pressure Switch Unloader Pressure Switch Differential 15 to 70 psi Pressure Switch Range 45 to 160 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