Will Phoenix Phase Converters Run Resistive Loads?

Yes — Phoenix Phase Converters can power resistive three-phase loads such as heaters, heating elements, and resistance welders. However, there are important sizing and application notes to understand first.

What Are Resistive Loads?

Resistive loads convert electricity to heat — no motors, no inductive starting. Examples include:

  • Three-phase electric heaters and furnaces
  • Three-phase oven heating elements
  • Resistance welders (spot welders, seam welders)
  • Three-phase heat trace systems

Sizing for Resistive Loads

Resistive loads have no startup inrush — they draw the same current at startup as at full running. Use a 1.0x multiplier based on the kW load converted to HP equivalent:

  • 1 kW = 1.341 HP
  • Example: 10 kW heater = 13.4 HP equivalent — use GP15NL
  • For welders: size based on peak kVA demand, not average — welders have high duty-cycle peaks

Voltage Balance Is Critical for Heaters

Three-phase heaters are wye or delta connected. Voltage imbalance directly affects heat output — a 3% voltage imbalance can create a 9% current imbalance and uneven heating. Make sure your converter is properly sized and capacitors are tuned for the connected load.

Resistance Welders — Special Note

Resistance welders draw very high peak current for short durations. Contact us before ordering for a welder application — sizing is more nuanced than standard HP-based calculation. Call (800) 417-6568.

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Resistive Loads — FAQ

Can I run a three-phase electric kiln on a phase converter?

Yes — kilns are purely resistive loads (heating elements). Size based on kW: divide kW by 0.746 to get HP equivalent, then apply 1.0x multiplier. Call us to confirm sizing for your kiln.

What about three-phase welders?

MIG and TIG welders are partially resistive with inductive components. Resistance spot welders have high peak inrush. Call (800) 417-6568 with your welder's kVA rating for proper sizing.

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Questions? Talk to an engineer.

Free sizing help. Made in Phoenix, AZ. Lifetime warranty on every unit.

Shop Phase Converters

(800) 417-6568