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Static Phase Converters Provide 3-phase Power from Single-phase Lines

cUL - U.S. Listed



The Ronk ECONO-PHASE Shifter is a cost-effective, highly efficient phase converter for use in applications where a single motor operates with light to medium loading, and low initial cost is desired.

  • Run capacitors maintain current on all three phases
  • Ideal for drill presses, grinders, mills, saws, and small air compressors
  • These units can reduce costs when handling the load surges typical with Design D high-slip pump jack motors

Typical Applications

  • Air compressors – small
  • Conveyors
  • Drill presses
  • Electric hoists
  • Engraving machines
  • Fly wheel loads
  • Grinders
  • Lathes – small
  • Mills
  • Motors (900 RPM - 1200 RPM, 8 or 6 pole)
  • Pumps (oil jack)
  • Saw (radial arm, table)
  • Sewing machines



The ADD-A-PHASE static phase converter offers rugged, high-efficiency, balanced power to operate motors. These converters are available in a variety of input and output voltages with ratings up to 125 HP.

  • High operating efficiency: approximately 97%
  • Linear components generate no harmonics
  • Limits inrush current when motor is starting, reducing starting KVA
  • Models are available for powering multiple motors
Model Applications
Type S
  • Pumps
  • Compressors
  • Fans and blowers
Type AA
  • Hydraulic elevators
  • Balers
  • Compaction equipment
Type HD
  • Community warning sirens
  • Critical use motors
  • Valve operators
Type SAC
  • Air conditioning units
  • Refrigeration units
Type SUB
  • Submersible pump applications
Type K-Duo
  • Lift stations
  • Booster pumps
  • Air conditioning units
  • Multiple motor applications

Other Typical Applications

  • Crop drying equipment
  • Irrigation pumps
  • Oil field water flooding
  • Soil remediation blowers
  • Vacuum pumps
  • Ventilation systems
  • Breathing air compressors
  • Ice making equipment