General Purpose Transformer; Primary Voltage 120/208/240 Volt AC; Secondary Voltage 27.5 Volt; Frequency Rating 60 Hertz; Power Rating 50 Volt Amp; Insulation Class Class 2 (Not Wet), Class 3 (Wet); Terminal Type 9 Inch Lead Wire; Temperature Rise -20 to 105 Deg F; Mounting Foot/Plate/Clamp/Panel Mount; Size 2-3/16 Inch Width x 3-5/8 Inch Depth x 3-3/16 Inch Height; Approval UL 1585, CSA; Output Voltage Rating 24 Volt AC; Application Heating/Cooling Control System; Includes Metal End Bell, Button