SureStart® - three phase

Give large compressors and motors a soft start and extend their lifetime

Get rid of the damaging start-up torque and achieve over 40%* reduction in compressor startup current with our range of three phase Surestart solutions.

The three phase soft starter is designed to significantly reduce start-up current and noise in many three phase motors.

The start-up current can be reduced by approximately 40% without compromising the start-up torque required.

Three phase soft starters are designed to cover a wide range of voltage models for 2 to 20 hp sized motors and are available in both 60Hz and 50Hz models.

See all Downloads at the bottom of the page.

Supply voltages

• 208-230 Volts

• 380 Volts

• 415 Volts

• 460 Volts


  • HVAC/R
  • Irrigation/submersible pumps
  • Compressors
  • Marine/RV
  • Solar power
  • RV/trucks
  • Military/government
  • Backup generators

Features and benefits

  • Reduce inrush current by up to 40% at startup
  • Voltage protection from brownout and intermittant power failure
  • Automatic optimization of motor current
  • Reduces light flicker
  • Extends life by reducing stress and heating of compressor/motor
  • Allows systems to meet certain utility requirements
  • Auto-Start on power up with no requirement for auxiliary control power
  • Easy installation with minimal wiring required

Motor Protection Functions

  • Low voltage / high voltage shutdown
  • Provides phase reversal protection
  • Delay function limits number of motor starts per hour
  • Internal timing prevents rapid cycling faults
  • Provides brownout protection
  • Prevents fatigue failure of motor bearings, piping and motor foundation structure


• SS5A04-27SN (460V, 60Hz, 04-27 FLA)

• SS4A04-34SN (415V, 50Hz, 04-34 FLA)

• SS3A04-27SN (380V, 50/60Hz, 04-27 FLA)

• SS2A04-28SN (208-230V, 50/60Hz, 04-28 FLA))