Star-delta starting describes the control of electric motors. There is a circuit with contactors through which a motor is initially star-connected when it is switched on. After a certain time, usually realized by time relays, the motor is switched from star to delta connection. This control reduces the starting current and the starting torque. As with a direct start, current peaks do occur. However, these are lower.
A soft starter or frequency inverter can be used to control a motor instead.
