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 65 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 NSF UL