Minimising Start Current: What start current I can expect if I use a soft starter?

Soft starters can limit start current to any desired level. However, the minimum level of start current for a successful start depends on the motor and load.
To start successfully, the motor must produce more acceleration torque than the load requires, throughout the start.
Reducing the start current also reduces the torque produced by the motor. The start current can only be lowered to the point where the torque output remains just greater than the load torque requirement.
The likely start current can be estimated from experience, but more precise predictions require analysis of motor and load speed/torque curves.

Successful Start:

Unsuccessful Start: