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Autotransformer "ARB-250" (Lotos) was produced from I -k 1970. The autotransformer regulating household "ARB-250" (Lotus) is designed to manually maintain the output voltage of 220 volts when the input voltage changes from 150 to 250 volts. Power in the load should not exceed 250 watts. At 127 volt electrical network, maintaining the output voltage for the load is possible with changes in the network voltage from 90 to 150 volts.