A EnviroTec PE105105 Transformer, efficiently steps down voltage for reliable operation of various HVAC systems and components. Real OEM transformers are designed to meet exact specifications, ensuring optimal performance and peace of mind for your HVAC systems operation and longevity. Features. Fits Popular Models RTAC2004U1DNUAFNL1TY1DDNNN5TN10AR0EXN, RTAC1704UJ0NUAFNN1NY1DDCNN0NN10NN0EXN, RTWA070KYG01C0C0WRN. Product Type Transformer. Input Voltage 277 Volt. Output Voltage 24 Volt. Power Rating 50VASpecifications. Voltage 24 Volt. Spec Includes 277 to. Length 1 in. / 2.54 cm. Width 1 in. / 2.54 cm. Height 1 in. / 2.54 cm