Motors today come in 120 to 208 volts (50/60 Hz) or 200 to 277 volts (50/60Hz). Some manufacturers supply a tri-voltage of 120 to 277 volts. However, you need to specify your voltage as 120, 110, or 277m because the factory has to set the motors for the proper voltage at the factory. The motor control boards and units come with a step-down transformer for the control boards. Always specify that units come with the transformer for supply voltage when ordering control boards.