The Square D™ by Schneider Electric Type EO Industrial Control Transformers are designed with exceptional voltage regulation and low temperature rise. The transformer has 480/575VAC primary and 120VAC secondary. The E23 indicates that it is an electrostatically shielded transformer. 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.