Compared with the auto coupling step-down start mode, soft start can realize smooth start, reduce the starting current, reduce the mechanical impact of large current on the motor when the motor starts, and the impact on the power grid, improve the power quality and save energy. Reduce the impact of the voltage drop on the other electrical appliances due to large current, , reduce wear and tear, extend the service life of motor, and save the maintenance cost of machinery.

The energy saving of frequency converter is mainly reflected in the application of fan and water pump. In order to ensure the reliability of production, various production machinery in the design of the power drive,

​The main contact of the low voltage circuit breaker is manually operated or electrically operated. After the main contact is closed,