CR1 series motor soft starter (hereinafter referred to as soft starter) is mainlyused to control and protect the starting, run-ning and stopping of squirrel cage motor.Because when the motorstarts directly, the starting current can be as high as7~10 times the rated current of the motor, the impact on the electrical network is larger, and will afect the life of mechanicalequipment, and even cause serious failures, bring about significant economic losses. The use of CRl series softstarter canavoid these problems, and its performance has reached the advanced level of similar products in the world.