Dibao Toroidal Control Transformer , product specifications: single-phase\three-phase, from 5VA to 20KVA power, from 5Hz to 400Hz power supply, on the other hand, provide Audio Frequency Transformer. Characteristic: coiled by silicon steel belt, with round section area, without incision, free formal size, small cubage, high capacity, etc.I/P:0---220V---380V O/P:36V