Electric/Pneumatic Relay, 208Vac, 50Hz Frequency, De-Energized: ports 2 and 3 Connected, Port 1 Blocked, Energized: Ports 1 and 3 Connected, Port 2 Blocked, Junction Box and 15" Leads, Surface Mounting, 0-100 Degree Temperature Range, 5-95% RH Operating Humidity Range, 0.075Cv Minimum Capacity, Barbed Fitting for 1/4" OD Plastic Tubing, 50 Psi Maximum Safe Operating Pressure, Used to Interlock and Electrical System and Pneumatic Control System