AD Series, Digital Smart Phase Converter -This SMART Series Phase Converter is manufactured in the USA by American Rotary and provides strong, utility grade 3-phase power from single phase power for any equipment. AD series phase converters are specifically suited for CNC, VFD, rectified and any other voltage sensitive equipment. Best for: Any load, especially resistive, recitified and computer loads such as CNC, FD, EDM and battery chargers.