The Square D? by Schneider Electric Type EO Industrial Control Transformers are designed with exceptional voltage regulation and low temperature rise. This transformer is a single phase 50VA transformer designed for 240x480VAC primary with a 120VAC secondary. (The unit also supports 230x460VAC to 115VAC and 220x440VAC to 110VAC.) It is compliant with UL and CSA standards verified by third party UL carrying the cUL, UL labels, and self certified to the EN standards carrying a CE mark.