Pressure Switch Air Compressor Manual Switch Action Auto/Off (1) Port 1/4 in FNPT Pressure Switch Factory On/Off Setting 140/175 psi No Pressure Switch Unloader Pressure Switch Differential 30 to 65 psi Pressure Switch Range 40 to 175 psi Pressure Switch Electrical Contact Form DPST Pressure Switch Action Standard NEMA Rating 1 Series MDR11 HP @ 1 Phase - 120V 2 hp HP @ 1 Phase - 240V 3 hp Temp Range -22 Degrees to 257 Degrees F Standards CSA Certified UL Listed