Sws-n is a soft starter without bypass contactor. It is internally equipped with three-phase AC contactor, which can save energy and reduce emission without considering heat dissipation. Combined with technologies such as thyristor power drive, software and hardware protection, menu LCD display, keyboard operation, torque control and fuzzy PID closed-loop algorithm, it integrates motor soft start, soft stop, light load energy saving and various functions, Create a new intelligent starting device. The equipment has complete functions and stable performance. It is widely used in the starting process of transmission equipment, fans, pumps, compressors and other loads.