Phase Converter for a Laser Cutter

Phase Converter for a Laser Cutter

Industrial CO&sub2; and fiber laser cutters are precision machines that require clean, stable power. Most mid-to-large laser cutting systems run on three-phase power—and almost all of them also require a three-phase air compressor to deliver dry, clean air to the cutting head. A rotary phase converter is often the most practical way to power both from a single-phase service.

Sizing: Account for the Laser AND the Compressor

This is where many shops make a mistake—they size only for the laser and forget the compressor is also drawing three-phase power. You must size the converter for the combined load:

Check the laser’s nameplate or spec sheet for Full Load Input Amps. Then find the compressor motor HP. Add both figures together as shown. Compressors use a 2.5× multiplier because they are hard-starting loads.

Sizing Example

A laser cutter drawing 20 amps input paired with a 10 HP compressor: 20 + (10 × 2.5) = 45 HP converter → GP50PL (round up to next available size).

DualZone for Larger Setups

If your laser cutter is large (40+ amp input) or your compressor is 15 HP or greater, a DualZone phase converter may be the better fit. DualZone units handle heavy combined loads more smoothly and are available in sizes up to 100+ HP.

Always Use the PL Model for Laser Cutters

We strongly recommend the PL series for all laser cutting applications. Laser machines are controlled by precision electronics that are sensitive to power interruptions and voltage fluctuations. The PL model’s built-in voltage monitor and pushbutton controls help protect against both.

What to Confirm Before Ordering

• Laser full-load input amps (from nameplate or spec sheet)
• Laser operating voltage (230V or 460V three-phase)
• Compressor motor HP and voltage
• Available single-phase service amperage

📞 800-417-6568 — Laser sizing is a bit more complex. Our team does this every week and is happy to walk you through it.