Beaver Electrical Auto Transformer 10 KVA Model: EER10KH8C 1 phase 60 HZ Copper Wound 240/230/220/208 Volts Fully enclosed with mounting tabs. Weight is 21 lbs. Brand new This is an auto transformer. It has no neutral and is used for changing voltages for things such as motors. For example if you have a lathe that requires 240 volts and you only have 208 volts in your shop you could use this transformer to supply 240 volts to the lathe rather than replacing the motor with a 208 volt motor.