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 140/175 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 4 to 6.3A, NEMA Rating 1, Series MDR3/OL