230V Single Phase to 3 Phase Converter

Not sure which converter is right for your equipment? Read our complete phase converter guide — types, sizing, and applications explained.

Industrial-grade 230V single-phase to three-phase rotary phase converters, built in Phoenix, Arizona, and backed by a lifetime generator warranty. Available in 3 HP to 100 HP standard models plus 10–200 HP Auto-Zoned dual-power configurations. Every unit ships in 1–2 business days from one of our 12 U.S. warehouses. Free sizing help from our team of phase-conversion specialists — call 800-417-6568.

Why customers choose a Phoenix phase converter

• NEMA 4 weatherproof enclosure standard — not an upgrade. Rated for indoor or outdoor installation, dust and water resistant.
• TEFC cast-iron idler motor standard — totally enclosed, fan-cooled construction rated for continuous industrial duty.
• Lifetime warranty on the generator (idler motor) — the longest warranty in the phase-converter industry.
• Made in the USA — assembled and tested in Phoenix, AZ. Full documentation and wiring diagrams included with every unit.
• 50+ years of phase-conversion expertise — talk to a live specialist, not a call center.
• Ships in 1–2 business days from 12 warehouses coast-to-coast.

What a 230V rotary phase converter does

A 230V single-phase to three-phase rotary phase converter takes standard 230V (also called 220V or 240V) single-phase power from the utility and generates a true three-phase 230V output for industrial equipment. The rotary design uses an idler generator to produce a real third leg of AC power — not a synthetic or approximated waveform — so it runs any motor load at full rated horsepower, including hard-starting equipment like air compressors, CNC machines, milling machines, lathes, elevators, well pumps, and rooftop HVAC units.

Unlike a static phase converter (which only runs a 3-phase motor at about two-thirds of its rated power and is limited to light-duty use) or a VFD (which is single-motor, variable-speed only), a rotary phase converter can run multiple machines at once, handle inductive and resistive loads, and start heavy motors without derating.

How to size a 230V phase converter

For most standard applications, size the converter at 2× the horsepower rating of your largest motor. That covers the starting-current inrush and leaves headroom for additional loads on the same converter. For hard-starting equipment (air compressors, HVAC compressors, high-inertia loads), use 2.5× the largest motor's HP, or choose one of our NLA AutoLink models designed for those loads.

Not sure what you need? Use our phase converter sizing wizard, read the full sizing guide, or call us at 800-417-6568 — we've been sizing these for over 50 years.

230V phase converter models and pricing

Our GP-NL series 230V rotary phase converters range from 3 HP (GP3NL, $749) to 100 HP (GP100NL, $13,034). Auto-Zoned dual-power units — designed to efficiently run either of two motor sizes on demand — range from 10/20 HP up to 100/200 HP.

• Small shop (3–10 HP): GP3NL, GP5NL, GP7NL, GP10NL — for lathes, mills, small compressors, and single-machine home shops.
• Mid-size shop (15–30 HP): GP15NL, GP20NL, GP25NL, GP30NL — for machine shops running multiple tools, larger CNC machines, and mid-size compressors.
• Industrial (40–100 HP): GP40NL through GP100NL — for irrigation pumps, elevators, industrial HVAC, and large production equipment.
• Auto-Zoned dual-power (10/20 to 100/200 HP): Ideal when you run either a small load or a large load — the converter automatically zones to the right power level, saving electricity and reducing wear.

Common applications for a 230V rotary phase converter

• Lathes and metal turning equipment
• Air compressors (rotary and reciprocating)
• CNC machines (Haas, Mazak, Bridgeport, Fadal, Hurco, and more)
• Milling machines, drill presses, band saws, and shop tools
• HVAC rooftop units and industrial air conditioning
• Well pumps and irrigation systems
• Elevators and residential lifts
• Grain dryers and agricultural equipment
• Welders and welding equipment
• Woodworking equipment (large planers, jointers, wide-belt sanders)

Frequently asked questions about 230V phase converters

Will a 230V phase converter run my 220V or 240V equipment?

Yes. In North America, 220V, 230V, and 240V are the same nominal voltage — utility voltage varies slightly by region and time of day. A 230V rotary phase converter runs equipment labeled for any of these voltages without any modification.

How much does a 230V phase converter cost?

Our 230V rotary phase converters start at $749 for a 3 HP GP3NL and scale up to $13,034 for a 100 HP GP100NL. Auto-Zoned dual-power models start at $3,240. See individual product pages for current pricing and available discounts.

Do I need a 230V or a 480V phase converter?

If your single-phase utility service is 230V (typical for residential and light-commercial buildings), and your equipment runs on 230V three-phase, you need a 230V-to-230V converter — this collection. If your equipment runs on 460V or 480V three-phase, you need a 230V-to-460V phase converter with a step-up transformer.

How long does a rotary phase converter last?

A properly sized and installed Phoenix rotary phase converter routinely runs 20+ years. The generator (idler motor) is covered by our lifetime warranty — most competitors offer only 2–5 years.

Can I run multiple machines on one 230V phase converter?

Yes — that's one of the biggest advantages of a rotary phase converter over a VFD. Size the converter for 2× the largest motor's HP, and you can run additional smaller motors on the same converter as long as the total running load stays within the converter's rated capacity.

How fast can I get one?

All in-stock 230V rotary phase converters ship within 1–2 business days from our nearest warehouse. Freight delivery to your location typically takes 3–7 business days depending on location.

Do you offer sizing help?

Yes — free. Call 800-417-6568 and speak with a phase-conversion specialist. We've been sizing these for over 50 years, and we'll spec the right converter for your specific equipment, voltage, and installation.