主令開(kāi)關(guān)是指按照預(yù)定程序轉(zhuǎn)換控制電路接線的主令電器，用作控制接觸器、繼電器線圈及其它控制電路的各種非自動(dòng)轉(zhuǎn)換裝置及磁力主令元件，由運(yùn)行人員直接操縱，發(fā)出命令脈沖，作用到其它機(jī)構(gòu)，以開(kāi)動(dòng)或停止機(jī)組，改變?cè)O(shè)備的運(yùn)行狀態(tài)（跳閘或合閘）的開(kāi)關(guān)。常用主令開(kāi)關(guān)有兩種：按鈕開(kāi)關(guān)和控制開(kāi)關(guān)。
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