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A 300 HP phase converter converts single-phase electrical service into balanced three-phase power for large industrial facilities and high-demand operations.
These systems are typically used to power entire production lines, multiple large motors, and facility-wide equipment when utility three-phase power is not available.
American Rotary systems are engineered to deliver balanced voltage, strong starting torque, and reliable three-phase power for the most demanding industrial environments.
A typical 300 HP phase converter can support loads up to approximately 150 HP depending on the starting load and electrical configuration.
For higher horsepower requirements, these systems are typically configured using multiple rotary units operating in parallel, engineered to match the required load, starting characteristics, and installation environment.
American Rotary offers 300 HP phase converter systems designed for facility-wide power distribution and heavy industrial applications.
These systems are engineered on a project basis, ensuring proper integration with your equipment, electrical service, and operational demands.
Whether you are powering multiple production lines, large-scale processing equipment, or an entire manufacturing facility, these systems provide reliable three-phase power from single-phase electrical service.
| Model | Description |
|---|---|
| ADX 300 HP Smart | Designed for hard-starting equipment and high inertia loads that require strong starting torque and stable power delivery. |
| AI 300 HP Industrial | Designed for demanding industrial and agricultural environments with a NEMA 3R-rated outdoor enclosure. |
| AUL 300 HP UL Smart | Designed for installations requiring UL-certified electrical equipment and compliant commercial or industrial installations. |
American Rotary converters are built for long-term reliability and performance and are backed by a lifetime warranty.
All models are available in wall mount and floor mount configurations to accommodate different installation environments.
Choosing the right phase converter size depends on your equipment, starting load, and electrical service.
Explore other common phase converter sizes:
5 HP phase converter → 7.5 HP phase converter → 10 HP phase converter → 15 HP phase converter → 20 HP phase converter → 25 HP phase converter → 30 HP phase converter → 40 HP phase converter → 50 HP phase converter → 60 HP phase converter → 75 HP phase converter → 100 HP phase converter → 120 HP phase converter → 150 HP phase converter → 200 HP phase converter → 300 HP phase converter →
Explore real installations, customer stories, and step-by-step guides from the largest phase converter video library on YouTube.
Watch how American Rotary power runs CNC machines, welders, farm equipment, woodworking tools, and more — all with clean, steady, reliable power built in the USA.
Our Advantages
In-stock equipment ships quickly so you can keep your operation running without delays.
American Rotary equipment is designed for real-world shop environments, with reliable components and proven performance.
From common applications to specialized setups, we stock a range of solutions ready to ship. If you don’t see what you need, we can help source it.
Choosing the right equipment matters. Our team helps you select the correct solution based on your application and requirements.
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
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
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
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
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
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
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
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
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
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 MOREMark Anderson
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 MORECustom Machined Concepts | Andrey Girenko
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
A 300 HP phase converter is commonly used in large manufacturing plants, processing facilities, and industrial operations where three-phase power is not available.
Common types of equipment that can be powered include:
The actual capacity depends on the starting load of the equipment and the available single-phase electrical service.
Yes. These systems are designed to power multiple machines, production lines, or large sections of a facility, as long as the combined electrical load stays within the system’s rated capacity.
They are often used in applications where multiple processes operate at different times or under varying load conditions.
Phase converters are typically sized using a 2:1 guideline, meaning the converter capacity should be about twice the horsepower of the largest motor you need to start.
For example, a 300 HP phase converter may be used to start a motor around 150 HP, depending on the starting load and equipment type.
Other factors that influence sizing include:
At higher horsepower levels, rotary phase converters are designed as parallel systems to ensure performance and reliability.
A 300 HP system typically uses multiple units operating together, such as four ADX75 units in parallel, which allows:
The electrical requirements for a 300 HP phase converter depend on the input voltage and installation setup.
Systems of this size require significant single-phase electrical service and proper installation planning. It is recommended to review your application with a qualified electrician or phase converter engineer.
