Pressure Switch Application Duct Heater 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 6 in wc Maximum Operating Temperature 130 Degrees F Maximum Pressure Rating 50 in wc Maximum Pressure Setting 6 in wc Minimum Differential Pressure Setting 0.5 in wc