What is a major benefit of using a soft starter for electric motors?

The major benefit of using a soft starter for electric motors lies in its ability to reduce both mechanical stress and electrical inrush current at startup. When an electric motor is started directly, it typically experiences a high inrush current, which can be several times greater than its full-load current. This sudden surge can lead to significant wear and tear on the motor and connected equipment, potentially causing premature failure or damage.

By gradually ramping up the voltage and current supplied to the motor, a soft starter controls the acceleration of the motor, allowing it to gradually reach its operating speed. This controlled startup not only minimizes mechanical stress on components such as belts, gears, and bearings but also protects the electrical components from the high inrush current. As a result, using a soft starter can enhance the reliability and longevity of both the motor and the overall system.

The other options, while related to electric motors, do not accurately capture the primary advantage offered by soft starters in the context of reducing stress and inrush currents during startup.