Pressure Switch 575Vac 1Hp F +Options, Standard, Manual Switch Action None, (1) Port, 1/4 in FNPS, Pressure Switch Factory On/Off Setting 30/50 psi, No Pressure Switch Unloader, Pressure Switch Differential 15 to 30 psi, Pressure Switch Range 20 to 40 psi, Pressure Switch Electrical Contact Form DPST, NEMA Rating 1, HP @ 1 Phase - 120V 1 1/2 hp, HP @ 1 Phase - 240V 2 hp, HP @ 3 Phase - 240V 3 hp, HP @ 3 Phase - 480V 1 hp, Temp. Range -33 Degrees to 257 Degrees F, Standards CSA, UL