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Sizing Chart

The following phase converter wizard has been used by American Rotary Engineers to successfully size tens of thousands of phase converters. For additional sizing assistance call 1-888-743-6832.

*If your power rating is different than horsepower (HP), use the below calculations (or see video below) to find the proper HP rating to input into the Phase Converter Wizard.

**Please note these calculations are for 208 – 240 volts. If you are in need of a different voltage setup please call to talk with one of our sales associates.


• 240v amps / 2.8 = 240v HP

• KW * 1.342 = HP

• KVA = HP

• Watts / 1000 * 1.342 = HP

Phase Converter Wizard

When sizing for a Rotary Phase Converter it is best to size with a 2:1 ratio to ensure you will have enough starting capacity. This sizing guideline will protect your equipment long term and ensure it performs at its highest efficiency.

Try out our Phase Converter Wizard by selecting your equipment type and inputting its total HP rating to see which converter series and size would be best for you.


Phase Converter for Welder

High Performance Digital Rotary Phase Converter

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AI - Industrial Phase Converter

Industrial Grade Phase Converter

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ADX - Smart Phase Converter

Extreme Duty Digital Rotary Phase Converter

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AD - Digital Phase Converter

High Performance Digital Rotary Phase Converter

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AR - Pro Phase Converter

General Purpose Rotary Phase Converter

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For models 75 and larger please call us at 1.888.743.6832

5 Things You Should Know Before Buying a Phase Converter

In this video, Chris shares the 5 things you should know before buying a phase converter, including...

- What you need to run a phase converter

- How to determine the right size phase converter

- The right phase converter for your type of application

And much more!