Motor control

Soft Starters

Reduced-voltage starting for critical medium-voltage motor loads.

Soft Starters industrial motor solution

Soft Starters specifications and applications

Soft starters reduce mechanical and electrical stress during motor starting.

The MVC Plus style package includes protection, ramp features, isolation, bypass, and coordinated fusing.

  • Medium voltage
  • Built-in CT
  • Up to 12 RTD channels
  • SCR stack
Soft Starters product image Soft Starters product image

Engineering considerations

Torque and speed-curve matching

Replacement designs must consider existing load curves, starting current, and speed-torque behavior so the new motor remains compatible with the driven machine.

  • Match original speed-torque curve and starting behavior
  • Reduce inrush current where possible
  • Keep adequate torque safety factor during network voltage drop and soft-start operation

Related case studies

Torque and speed-curve matched replacement

Torque and speed-curve matched replacement

A replacement motor design was matched against the original speed-torque behavior and driven-machine load curve.

Open Case Study

Hazardous gas compressor motor package

Hazardous gas compressor motor package

A gas transmission compressor application used an 8,400 kW, 11 kV, 4-pole motor package with hazardous-area requirements.

Open Case Study