A soft starter is a solid-state device that protects AC electric motors from damage caused by sudden influxes of power by limiting the large initial inrush of current associated with motor startup. They provide a gentle ramp up to full speed and are used only at startup (and stop, if equipped)
Improved Efficiency: The efficiency of soft starter system using solid state switches is more owing to the low on state voltage.
Controlled startup: The starting current can be controlled smoothly by easily altering the starting voltage and this ensures smooth starting of the motor without any jerks. Controlled acceleration: Motor acceleration is controlled smoothly. Low Cost and size: This is ensured with the use of solid state switches.