Circuit Breaker Transformer; Primary Voltage 208/277/480 Volt AC; Secondary Voltage 27.5 VOC; Frequency Rating 60 Hertz; Power Rating 50 Volt Amp at 24 Volt AC; Terminal Type 9 Inch Lead Wire; Temperature Rise -20 to 105 Deg F; Mounting Plate/Panel; Size 2-3/16 Inch Width x 3-5/8 Inch Depth x 3-3/16 Inch Height; Approval UL, CSA; Includes Metal End Bell; Application Heating/Cooling Control System