Autotransformer `` ARB-250 '' (Lotus).Power supplies. Rectifiers, stabilizers, autotransformers, transient transformers, etc.Regulating autotransformersAutotransformer "ARB-250" (Lotus) has been produced since the 1st quarter of 1970. Household adjusting autotransformer "ARB-250" (Lotus) is designed to manually maintain the output voltage of 220 volts when the input voltage changes from 150 to 250 volts. The power in the load should not exceed 250 watts. With a 127 volt electrical network, maintaining the output voltage for the load is possible when the network voltage changes from 90 to 150 volts.