在额定控制电源电压低于35%时，欠电压脱扣器应防止断路器合闸。

At rated control supply voltage less than 35% under-voltage should prevent breaker from closing.

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在额定控制电源电压低于35%时，欠电压脱扣器应防止断路器合闸。

In case of the operation voltage less than 35% of the rated voltage, the under-voltage should prevent the breaker from closing.

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一次，学生们正在机房上课，总电源突然跳闸，重新合闸之后，一个教室竟有大约三分之一的计算机以这种方式宣布罢工。

First, the students are the engine room school, with a total power trip suddenly, after re-closing of a classroom, there were about one-third of the computer to declare a strike in this way.

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