A bypass soft starter is a device used to control the starting current and torque of an AC motor. It is designed to reduce the mechanical stress and electrical shock on the motor and power system during startup. The bypass soft starter typically consists of a power electronic module, a control circuit, and a bypass contactor. The power electronic module is used to control the voltage and frequency of the power supplied to the motor, while the control circuit is used to monitor the motor's speed and torque and adjust the power output accordingly. The bypass contactor is used to bypass the power electronic module once the motor has reached a certain speed, thereby reducing the power loss and improving the efficiency of the system. Bypass soft starters are widely used in various applications, such as pumps, fans, compressors, and conveyors, where a smooth and reliable startup is required.