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Contact SupplierThe autotransformers are frequently used to convert local Power line Voltage to some other Voltage value needed for a particular piece of equipment. Most often, this conversion is from 125 Volts to 250 Volts, or 250 Volts to 125 Volts. Autotransformers may also be used in voltage reduction type, lighting energy saving units (economy models), it may also be used as soft-starters for squirrel-cage induction motors.