Technical Support
Phase Converter Sizing Calculator
Free Sizing Tool
Enter your motor specs and we'll recommend the right rotary phase converter for your application — sized by our engineers, not a guess.
Your Equipment
Tell us about the load you need to run.
Not sure? Call 800-417-6568 and we'll size it together.
Check the motor nameplate. For multiple motors, enter the largest one's HP.
Resistive loads size at roughly 1 HP per amp of 3-phase draw.
"Frequent" means multiple starts per hour or back-to-back cycling (e.g. cycling pumps, lifts).
Helps us flag if you'll need a DualZone unit to soft-start a larger load.
VFDs draw less inrush but need clean, balanced 3-phase. We'll adjust the recommendation.
Your Recommendation
Updates in real time as you fill in the form.
Select your equipment and enter the HP or amp draw to see your recommendation.
Sizing backed by 50 years of phase converter engineering.
American-made in Phoenix, AZ
UL-listed components
Free expert sizing help
Talk to a Phase Converter Engineer
📞 (800) 417-6568Free sizing help • Lifetime warranty • Made in USA • Mon–Fri 7AM–5PM MST