Rotary Phase Converter AD40 &ndash; 40 HP Digital Controls Heavy Duty HD CNC USA Made Best for: 20 HP Any load, especially resistive, rectified and computer loads such as CNC, VFD, EDM, battery chargers. For a 40HP load, see sizing table below. Single motor start: 20HP | CNC: 20HP/14.9kW | Resistive: 56 amps ~Country of Manufacture: Unite States, ~Manufacturer:American Rotary, ~Made: Made in USA