In which scenario would a soft starter be used in motor protection?

A soft starter is primarily used to reduce inrush current during motor starting. When an electric motor starts, it typically draws a significantly higher amount of current—known as inrush current—compared to its full-load current. This sudden spike in current can lead to mechanical stress on the motor components, electrical stress on the power supply, and potential damage to the electrical system.

By gradually ramping up the voltage supplied to the motor, a soft starter effectively manages this current surge. It provides a smoother start by controlling the voltage, thereby limiting the inrush current and reducing the initial torque. This is particularly important for large motors where inrush currents can be several times greater than normal operating currents.

In contrast, while increasing torque during startup, providing constant voltage, or enhancing braking capabilities may all be relevant functions in motor management, they do not specifically address the critical issue of inrush current that soft starters are designed to mitigate. This makes the scenario of reducing inrush current the most appropriate application for a soft starter in motor protection.