Why it is used

Star-delta starting reduces the starting current in suitable three-phase motors.

How it works

The motor starts in star and, after a preset time, switches to delta.

Common faults

  • Incorrect transition timing.
  • Contactor failure.
  • Incorrect interlocking.
  • Motor not accelerating sufficiently before the transition.

Important

The application must be suitable for this starting method and the specific motor wiring.