What advantage does using soft starters provide for 3-phase motors?

Using soft starters provides a significant advantage by managing high starting current in 3-phase motors. When a motor starts directly from rest, it can draw a much higher current than its full-load current, which can lead to stress on the electrical system, mechanical stress on the motor and connected equipment, and potential damage.

Soft starters gradually increase voltage to the motor, allowing it to accelerate slowly and smoothly, which limits the inrush current. This controlled ramp-up not only reduces electrical stress but also minimizes mechanical stress on motor components, leading to increased longevity and reliability. Moreover, by keeping the starting current within manageable limits, soft starters help maintain system stability and reduce the risk of tripping protective devices or causing voltage drops in the supply network.

While the other options may represent various features or benefits related to motor operation, they do not directly address the critical advantage of managing inrush current, which is essential for the safe and efficient operation of 3-phase motors.