Differential 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 1/8 HP @ 125 V AC 15 A @ 120 to 480 V AC 60 Hz Resistive Derate to 10 A for Operation at High Cycle Rates Maximum Differential Pressure Setting 0.5 in wc Maximum Operating Temperature 180 Degrees F Maximum Pressure Rating 45 in wc Maximum Pressure Setting 0.5 in wc