Autotransformers Autotransformers Victron Energy 32A 120/240Vac Victron Energy ITR000100001 €539.15 The Autotransformer: for step up, step down and split phase balancing An 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. Add to basket