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 215/250 psi, Pressure Switch Unloader 1/4 in Compression, Pressure Switch Differential 40 to 105 psi, Pressure Switch Range 40 to 360 psi, Pressure Switch Electrical Contact Form 3PST, Pressure Switch Action Standard, Overload Protection 6.3 to 10A, NEMA Rating 1, Series MDR3/OL