Autotransformer, Input Voltage 480 to 277 V, Output Voltage 277 VAC, Input Power 250 W, Power Output 480/277W, 250 VA Rating, Input Current 0.56 A, Output Current 0.903 A, Ballast Factor 0.85, Power Factor 0.93, Height 1.69 in, Length 9.5 in, Width 1.19 in, Ambient Temp. Range 0 to 50 Degrees C, Min. Starting Temp. -20 Degrees F, Standards UL Listed. This item has been restricted from sale in the following state (s): []