Open three-phase Vario® transformer designed and tested according to EN61558 - VDE0570. Designed as three separate single phase torodial autotransformers. Degree of protection IP00. The Noratel Vario® transformer is an optimal solution when continuous control of voltage and current is preferable. The construction ensures a clean sine voltage and no radio interference or additional harmonics are generated. Designed for continuous adjustment of alternating voltage and currents. In addition to standard types, Vario® variable transformers are supplied strictly on customer request.