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The autotransformer of the transitional household APB-630 (South) has been produced since 1970 by the Zaporizhtransformator software, possibly by some other enterprises. APB is designed to match the input voltages of electrical devices with a capacity of up to 630 watts with the electrical network. If the network is 127 V, then the output of the autotransformer is 220 V or vice versa.