Technical Support
Choosing the Right Phase Converter
Choosing the Right Phase Converter — Which Type is Best for You?
Not all phase converters are created equal. Whether you need the rugged simplicity of a rotary converter, the advanced features of a digital model, or a custom transformer package, we'll help you make the right choice for your equipment, budget, and shop environment.
Four Types of Phase Converters
1. Rotary Phase Converters (NL Series) — The Workhorse
Best for: General shop equipment, CNC machines, woodworking, metalworking, pumps
How it works: Uses an idler motor to generate a true third leg of power. Simple, proven technology that's been powering shops for 50+ years.
Advantages:
- ✅ True balanced three-phase power
- ✅ Industrial-grade reliability
- ✅ Can run multiple machines simultaneously
- ✅ Lifetime warranty
- ✅ Made in Phoenix, Arizona
Considerations:
- Requires 2× motor HP for hard-starting loads (lathes, CNCs)
- Audible hum from idler motor (typically 60-70 dB)
2. Pilot Phase Converters (PL Series) — Better Balance
Best for: Equipment sensitive to voltage imbalance, precision machining, automation
How it works: Adds phase-balancing capacitors and control circuitry for tighter voltage regulation than standard rotary converters.
Advantages:
- ✅ Superior voltage balance (within 2-3%)
- ✅ Better for sensitive electronics
- ✅ Improved motor efficiency and longevity
- ✅ Same reliability as NL series
Considerations:
- Higher upfront cost than NL series
- Still requires sizing headroom for hard-start loads
3. Digital Phase Converters (GPX & RD Series) — Smart Power
Best for: Automated equipment, remote monitoring, shops needing auto-start capability
How it works: Combines rotary phase generation with digital controls, auto-start relays, and optional remote monitoring.
Advantages:
- ✅ Auto-start capability (no manual power-on)
- ✅ LED status indicators
- ✅ Soft-start reduces inrush current
- ✅ Quieter operation
- ✅ Optional remote monitoring
Considerations:
- Premium pricing
- More complex electronics (though still very reliable)
4. Transformer Packages (NLTA/PLTA) — Voltage Conversion + Phase Conversion
Best for: Equipment that needs BOTH phase conversion AND voltage step-up/step-down
How it works: Bundles a rotary phase converter with a matching three-phase transformer. For example, convert 230V single-phase → 460V three-phase in one step.
Advantages:
- ✅ Single integrated solution
- ✅ Pre-wired and tested
- ✅ Saves on separate transformer purchase
- ✅ Common for imported machinery (460V requirement)
Common voltage combinations:
- 230V single-phase → 460V three-phase
- 208V single-phase → 480V three-phase
- 240V single-phase → 208V three-phase
Quick Decision Guide
| Your Situation | Recommended Type |
|---|---|
| Running 230V three-phase shop equipment | NL Series (standard rotary) |
| CNC machine with sensitive controls | PL Series (pilot phase converter) |
| Need auto-start for automation | GPX Digital |
| 230V power, but equipment needs 460V | NLTA/PLTA Transformer Package |
| Multiple large machines (25+ HP total) | DualZone Setup (call for quote) |
| High-voltage equipment (460V input) | NH/PH Series (460V rotary) |
Still Not Sure?
Talk to a phase converter engineer — free, no pressure.
We've sized and spec'd thousands of phase converters for shops, farms, and factories across North America. We'll help you pick the right type, size it correctly, and make sure it works the first time.
Free sizing help • Lifetime warranty • Made in USA • Mon–Fri 7AM–5PM MST
Related Resources
- 📐 Phase Converter Sizing Wizard — Calculate the right HP size
- ❓ Frequently Asked Questions — Common questions answered
- 🛠️ Expert Support — Installation help and manuals
- 🛒 Shop All Phase Converters
Talk to a Phase Converter Engineer
📞 (800) 417-6568Free sizing help • Lifetime warranty • Made in USA • Mon–Fri 7AM–5PM MST