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AD - Digital Phase Converters

The AD Digital Series phase converters are designed for voltage-sensitive equipment that requires stable and balanced three-phase power.

Using advanced digital voltage monitoring and control, these converters provide consistent performance for CNC machines, VFD systems, EDM equipment, and other precision industrial applications.

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When to Choose the AD Digital Series

The AD Digital Series phase converters are designed for equipment that requires stable, well-balanced three-phase power to maintain precision and consistent operation.

Using digital voltage monitoring and control, the AD Series continuously manages phase balance to help protect sensitive electronics and ensure smooth motor performance.

These converters help maintain consistent voltage levels that support precision machining processes and protect sensitive control electronics.

For general-purpose equipment such as woodworking machines, pumps, and compressors, the AR Pro Series may be a simpler and more economical solution.

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AD - Digital Phase Converter Models

Compare horsepower options to find the right digital phase converter for CNC machines, VFD equipment, and other voltage-sensitive industrial applications.

New to Phase Converter?
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Watch this quick guide on the 5 things you need to know before choosing a phase converter. It explains what matters, what to avoid, and how to make sure your equipment gets the right power.

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Our Advantages

Why Choose American Rotary
Phase Converters

Same-Day Shipping

Converters are built, tested, and stocked in our Wisconsin facility, then shipped the same day. You get the power you need without waiting weeks.

Proprietary Technology

Custom Baldor generator, digital MicroSmart™ control, CTR™ stabilization, and surge protection — technology you’ll only find at American Rotary.

Lifetime Warranty

Every converter is backed for life. You know we will support the unit as long as you own it.

Same-Day Replacement

If something does go wrong, we do not leave you stuck. We ship a replacement converter the same day so you can get back up and running.

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Customer stories

Real experiences from people who trust our products

My old rotary phase converter gave 30 years of faithful service before it went up in smoke. With customers asking when I’d be operational, I researched every manufacturer and the choice was clear on American Rotary. First impression when it ... READ MORE

FAA Certified Machine Shop Owner

  • Machining

Very good company to do business with. The salesman Lenny treated me like I was a big company. I was shopping for a roto phase for my home machine shop. He had all the time in the world for me. ... READ MORE

Rodney Mears

  • Machining

A quick google search pointed me toward American Rotary. It wasn’t their website or their pricing but the number of videos and testimonials about the quality of their product and the great service. I wasn’t disappointed. I called on a ... READ MORE

Carl DiPaolo

  • Machining

I purchased this unit for a tenant in a commercial property that needed 3 phase power and the cost for the utility company to bring it in was significantly higher with much longer times to complete the project. The phase ... READ MORE

Matt Peace

  • Metalworking

I tried an inexpensive digital converter that made my machine motors very hot due to unbalanced power. A person I bought a milling machine from said he had an American Rotary and was very happy with the quality, so I ... READ MORE

Brad Everett

  • Machining

When I started, the garage had a single 120 V receptacle behind a shelf. Now, there (4) duplex 120A receptacles, (1) NEMA 16,20 A 240/120V with a DPDT switch to select voltages. 30A 50A 1 phase receptacles. Two 20A, one ... READ MORE

Raymond Jensen

  • Agriculture

I called in a talked to a representative told them I have a refrigeration unit I was looking to run 3 phase to, gave them the specs and was recommended the ADX 10. I ordered it super fast shipping got ... READ MORE

Jonathan Arrington

  • Food Service

I had to move my workshop due to rent increases. The one I found didn’t have 3 phase. I found some cheap crappy digital shifter…didn’t work. Then I found American Rotary, they are the real deal! I am able to ... READ MORE

Mike Chinn

  • Woodworking

para todos los hispanohablantes America Rotary 100% recomendado fácil de instalar fácil de manejar fácil de cablear todo perfectamente gracias por su ayuda para poner en funcionamiento mi máquina edgebanding 3 Phase For all Spanish speakers, American Rotary 100% recommended. ... READ MORE

Neftaly Bustos Custom

  • Woodworking

Just got my ADX 5 up and running couldn’t be happier with my decision to purchase this excellent customer service and tech support. A++++++

... READ MORE

Mark Anderson

  • Metalworking

Absolutely love what american rotary does. Had a wonderful experience with their support team the phase converter we purchased and the transformer were supper easy to install definitely recommend buying from them. Customer service is 10/10

... READ MORE

Custom Machined Concepts | Andrey Girenko

  • Machining

American Rotary is an awesome company to work with, Mike was/is very helpful in answering my questions and getting me what I needed to get my shop ready for a new machine, giving me an option to either piggy back ... READ MORE

Charles Nelson

  • Machining

FAQs

Everything you need to know about getting the right power for your equipment.

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What is a digital phase converter?
A digital phase converter converts single-phase power into balanced three-phase power while actively monitoring and controlling voltage. This allows sensitive equipment such as CNC machines and VFD systems to operate with stable and consistent electrical performance.
AD digital phase converters are designed for voltage-sensitive equipment such as CNC machines, VFD-driven systems, EDM machines, battery chargers, rectified loads, and other precision industrial equipment.
A digital phase converter uses advanced voltage monitoring and control to maintain balanced output power. This allows sensitive electronic equipment to operate more reliably compared to general-purpose rotary phase converters.
Digital phase converters are typically sized based on the horsepower of the largest motor or load in the system. Many applications follow a 2:1 sizing guideline to ensure adequate starting capacity and stable operation.
The AR Series is designed for general-purpose equipment. The AD Series provides digital voltage balancing for sensitive electronic equipment. The ADX Series delivers higher starting torque for extreme-duty loads, while the AUL Series provides UL-certified systems for installations requiring compliance.
Yes. Digital phase converters can operate multiple machines as long as the combined running load does not exceed the converter’s rated capacity.
Digital phase converters generate a balanced third leg of power while actively controlling voltage to maintain stable electrical performance for sensitive equipment.
AD converters are designed for straightforward installation with accessible wiring connections and simple controls. Wall-mounted and floor-mounted configurations are available depending on the model.