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The ASB-0.3 autotransformer was produced presumably since 1963 by the Zaporozhkabel plant and other enterprises of the country. The autotransformer was manufactured both in a carbolite case and in a metal one. Designed for inclusion in the electrical network of various household appliances with a capacity of not more than 300 V * A. Required to reduce the voltage of the electrical network from 220 to 127 V or increase from 127 to 220 V.