4, master contactor

主接触器是一种由元件1 及其相当的元件、中间继电器、保护元件等控制的元件。其工作是接通或断开必要的控制回路,以便在规定条件下使设备投入运行,或在其它条件和异常条件下,使之退出运行。

English-Chinese electricity dictionary (电气专业词典). 2013.

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