Primary Voltage 208 V; Secondary Voltage 24 V; 50/60 Hz; Power Rating 75 Va; Insulation Class 105; Screw Terminal; Temperature Rise 55 Deg C; 0.48 Inch L X 0.2 Inch W Slot Mounting; Size 3.38 Inch W X 3.34 Inch D X 2.89 Inch H