Air Pressure Switch, Application Air Filtration, Furnace Control, Humidity Detection and Control, Commercial HVAC, Residential HVAC, Contact Form SPDT, Electrical Connection Type Screw Terminals, Electrical Rating 1 A Pilot Duty @ 120 VA, 5 A @ 120 to 277V AC, 5 A @ 28V DC, Housing Material Stainless Steel, Housing Type Conduit Box, Includes Adjustment Tool, Mounting Hardware, Input Voltage 120V AC, 277V AC, 28V DC, Maximum Differential Pressure Setting 0.8 in wc