Asynchronous electric motor is one of the most widespread propulsion in the industry, but it requires proper control for its operation. There are several different controls, depending on the application. Soft starters are useful for applications where the motor does not require speed control during operation. At the same time, soft start-up during start-up protects the motor from mechanical damage and from high starting currents. At the same time, the condition is that the engine is not heavily laden during startup (heavy starting).