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 80/100 psi, Pressure Switch Unloader 1/4 in Compression, Pressure Switch Differential 15 to 70 psi, Pressure Switch Range 45 to 160 psi, Pressure Switch Electrical Contact Form 3PST, Pressure Switch Action Standard, Overload Protection 20 to 24A, NEMA Rating 1, Series MDR3/OL