Pressure Switch, Application Frost and Ice Detection, Clogged or Dirty Filter Detection, Air Flow Control, Contact Form SPDT, Electrical Connection Type Screw Terminals, Electrical Rating 1/4 hp @ 250 V AC, 60 Hz, 15 A @ 120 to 480 V AC, 60 Hz, Resistive 1/8 hp @ 125 V AC, Input Voltage 120 to 480V AC, 125V AC, 250V AC, Maximum Differential Pressure Setting 1.6 in wc, Maximum Operating Temperature 180 Degrees F, Maximum Pressure Rating 45 in wc, Maximum Pressure Setting 1.6 in wc