Choosing a motor starter depends on the application and on the network
Full voltage motor starters are the most widely used
The driver between motor and load is able to withstand the mechanical stress of a direct on line start.
Starting with reduced voltage decreases the full load current (FLC) at the motor terminals in proportion to the voltage reduction while the full load torque (FLT) is reduced by the square of the voltage reduction.
Manual motor starters are electromechanical protection devices for themain circuit.
The manual motor starters protect the load and the installation against short-circuit and overload