Pressure Switch Pressure Switch Application Air Compressor Manual Switch Action Auto/Off/Reset Pressure Switch Port Type (1) 3/8 in FNPT (3) 1/4 in FNPT (4) Port Pressure Switch Factory On/Off Setting 160/200 psi Pressure Switch Unloader 1/4 in Compression Pressure Switch Differential 30 to 110 psi Pressure Switch Range 60 to 232 psi Pressure Switch Electrical Contact Form 3PST Pressure Switch Action Standard Overload Protection 2.5 to 4A NEMA Rating 1 Series MDR3/OL