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American Rotary phase converters are perfectly suited for precision metalworking equipment such as wire EDM’s, CNC lathes, CNC mills, and other voltage-sensitive applications. General Metal Fabrication equipment such as grinders, welders, shears, brakes, and benders, are often run on American Rotary phase converters. When converting from single phase to three phase power, American Rotary phase converters produce balanced 3-phase output to accommodate both very small, lightly loaded machines as well as very large or heavily…all with just one phase converter.

  • Manual Mills
  • Manual (Gearhead) Lathe
  • Machining Center
  • Turning Center
  • CNC Lathe
  • CNC Mill

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Made & Supported in the USA

Our Phase Converters are made in the USA, using only the highest quality parts. Our Wisconsin-based team includes in-house R&D, engineering, manufacturing, tech support and customer service. We are dedicated to delivering high quality products and great service to our customers.

American Rotary phase converters come with easy to use installation procedures. A step-by-step installation pictorial is available on our website and we have a You Tube video that outlines the ease of installation. In addition, you always have access to our 24/7 toll free technical support.

Built Tough to Last in the Toughest Conditions

Our exclusive integrated soft-start VIT (Variable Impedance Technology) is built directly into the idler/generator and drastically reduces inrush (starting) current. The result is reliable starts, every time, with no voltage drop that can dim your neighbors’ lights.

American Rotary phase converters are rated to run single or multiple motor loads. This capacity is only limited by the single phase current available. Our phase converters are precision balanced from a “no-load” condition so you don’t need to worry about running a small motor together with larger ones using the same phase converter. More importantly, our phase converters can operate with no load engaged for an indefinite period of time, so you don’t have to worry about damaging our units while your equipment loads are not operating. Our engineering department can help determine the right size phase converter for your needs.


American Rotary has a 20+ year history of providing innovative technology and design, making our three phase converters more durable, reliable and precise than competitors. We are committed to continuing to introduce features and advances to improve our product to meet your needs.

Industry Leading Phase Converter Features:

  • Precision voltage balanced with our patented MicroSmart Controller
  • Custom Powder-Coated Steel Nema 1 and Nema 3R Enclosures Available
  • Removable Sides for Easy Installation
  • Wall or Floor Mount Configurations available
  • VIT Electric Induction Generator with Soft Start Technology and Efficiency
  • Full Current, Latching Push Button Starter
  • PowerGuard Protection from Utility Interruption
  • Current Transient Reactor (ADX, AI, AMP Models) for Starting of High Inertia Loads


Andrew Miller, Owner / Billet Craft Designs

I purchased the AD30 from American Rotary about 2 months ago and so far have been extremely pleased. It is extremely quiet, very well built, and best of all, it just runs and works. As a business, I need equipment that I can rely on and trust and I am very happy that I trusted American Rotary. They had it to me within a week of ordering! Had an electrician come out and wire it in, 100 amp single phase breaker, then 2 guage wire going to the phase converter, the phase converter then feeds a 3 phase sub panel where I have my Haas Super Mini Mill wired into. Voltage is well balanced to within 5% which is what I need to run my CNC Mill. The Mill powers up and runs without any hiccups at all, I can’t even tell it’s being powered off a phase converter. No delay or lag when the spindle starts/stops. Overall, this phase converter is probably my best piece of equipment that I have as far as not having any hiccups. Extremely pleased and glad I didn’t waste my time with the other brands. Thank you!

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