Inverters are used to control motors (e.g. pumping stations). It is an electronic device that changes the DC to AC.
The frequency and output voltage is suitable for controlling constant and variable torque loads.
Soft starters are used to smoothly start (and stop) engines (e.g. pumping stations).
A smooth starter protects, starts and stops an engine smoothly by protecting the
pipe network and equipment from hydraulic shocks while saving electricity.