交流三相异步电动机的广泛使用，对电动机的启动提出了越来越高的要求。
The broad application of AC three - phase asynchronous motor has put higher requirements to the starting of motors.
可控制交流50Hz，380V，三相异步电动机的直接起动停止，并具有过载和 断相及失压保护。
Able to directly control AC 50Hz, 380V asynchronous motor with the protection of overload, phase-failure and voltage-absent.
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