Autotransformer 120/240 VAC 50AAn Autotransformer can be used for step-up, step-down, and split-phase output balancing purposes. While the step-up and step-down functions are fairly straightforward, split-phase output balancing may require some more attention.Please contact your dealer for any returns, repairs or support issues related to this product. Manufacturer : Victron Energy Manufacturer Part No : ITR000100052 UPC : 8719076066071