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When your equipment voltage does not match your power supply, a transformer bridges the gap.
American Rotary transformers let you step voltage up or down so your machines run exactly as designed.
From 208V to 600V, we help you get the right power without guesswork.
Sizing Chart Table
| Maximum Amps by Voltage | |||||
| Transformer Size (KVA) | 208v | 240v | 380/400v | 480v | 600v |
| 9 | 25 | 21.7 | 13 | 10.8 | 8.66 |
| 15 | 41.6 | 36.1 | 21.7 | 18 | 14.4 |
| 30 | 83.3 | 72.2 | 43.3 | 36.1 | 28.9 |
| 45 | 125 | 108 | 65 | 54.1 | 43.3 |
| 75 | 208 | 180 | 108 | 90.2 | 72.2 |
| 112 | 312 | 271 | 162 | 135 | 108 |
| 150 | 416 | 361 | 216 | 180 | 144 |
Use this chart to estimate the transformer size (KVA) you need.
Start with your voltage, then match your amperage to select the correct transformer.
How to use this chart
Note: It is recommended to size a transformer 20% larger to account for motor starting loads.
Transformer inventory levels can change quickly. For live availability, call 888-743-6832. Additional configurations are available upon request.
A transformer allows you to match your power supply to your equipment requirements.
Common uses include stepping 240V up to 480V, powering imported equipment, or pairing with a phase converter.
Auto transformers are compact and efficient for standard applications, while isolation transformers provide added protection for sensitive equipment.
Our Advantages
In-stock transformers ship fast so you can keep your operation running.
We partner with Hammond Power Solutions, a leading manufacturer of industrial transformers, to deliver reliable, high-quality performance in demanding environments.
From common voltage conversions to specialized applications, we stock a wide range of transformer configurations ready to go. If you don’t see what you need, we can source it.
Choosing the right transformer matters. Our team helps you size and select the correct unit based on your equipment, voltage, and load requirements.
Real experiences from people who trust our products
I needed a phase converter that was appropriately sized, reliable, easy to install and quiet. On top of all that I needed it quickly! I found your company on Google and browsed your website. I filled out the contact us ... READ MORE
Dustin Dunigan
We are using the AmericanRotary phase converter to power our 230 volt 3 phase truck tire changers. This allows us to stock 3 phase units and if single phase power is required we simply add the American rotary converter to ... READ MORE
Nick McCullough
My 3HP Phase Converter was wired in yesterday to my 1-1/2HP Bridgeport J head milling machine. Runs fantastic! I had a friend that is a qualified electrician complete the task. Your included directions were very easy for him to understand ... READ MORE
Erik Bailygaines
Got the converter on Thursday..super fast shipping to say the least! Thank you for getting it to me so quickly, already have it mounted and getting things wired up today.. Again thank you for the excellent service and tech support.
... READ MOREBen Gregory
After 8 years of perfect performance from my American Rotary 20 hp converter I burned out the control unit and had to replace it. The fault wasn’t the design…I was inadvertently abusing the start caps by “pulsing” my mixer. The ... READ MORE
Jim Brosseau
The American Rotary Phase Converter was recommended by a friend. After I purchased it unit online, I received a call from American Rotary checking that I had order the correct size for my equipment. Thanks! The installation was simple and ... READ MORE
Allen Hase
The phase converter is working perfectly. It’s much quieter that the previous one, and so far the VSD unit has not skipped a beat so the voltage appears to be nice and clean. Very happy with your product.
... READ MOREMark Fischer
Thanks for making such a great product. It was very user friendly to install and works perfect.
... READ MOREChris Miles
Just a note to say thanks. My ADX 5HP Rotary is up and running without a hitch. It is quite, fast and was easy to install. It makes my old Bridgeport and Hurco knee mills run perfectly. It was worth ... READ MORE
Kim Kohler
When we were looking to purchase a rotary phase converter for our shop we noticed a lot of price differences. Having bought cheaper items in the past, we knew all too well of quality and support issues down the road. ... READ MORE
Keith Hansen
Everything went perfect in the installation, the unit runs and performs excellent. Thank you for the great service and super fast shipping.
... READ MOREScott LaBombard
You do have an amazing item. We used this 5 hp unit to power up a 1.5 hp cooler and a 1 hp ice maker. The system works perfectly. We mounted it on the side interior wall, adjacent to the ... READ MORE
Linda
Use your voltage and amperage to estimate the required KVA using the sizing chart above.
Transformers can be connected in Delta or Wye configurations depending on your equipment and power system.
In most cases, you should match the configuration specified on your equipment nameplate.
If you’re unsure, our team can help you determine the correct setup.
Yes, as long as voltage and load requirements match. If unsure, contact our team.
