Pressure Switch Air Compressor Manual Switch Action None (1) 3/8 in FNPT (3) 1/4 in FNPT (4) Port Pressure Switch Factory On/Off Setting 215/250 psi 1/4 in Compression Pressure Switch Unloader Pressure Switch Differential 40 to 105 psi Pressure Switch Range 40 to 360 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