1746-NO8V

主觸頭（1為動觸頭，2為靜觸頭）串聯(lián)在被控制的三相電路中，當按下接通按鈕14時，主觸頭閉合且鎖扣3和搭鉤4鎖住，使開關(guān)處于接通狀態(tài)。此時，如果電磁脫扣器、熱脫扣器及欠電壓脫扣器均無異常反應(yīng)，則開關(guān)正常運行。

當線路發(fā)生短路或嚴重過電流時，短路電流超過瞬時脫扣整定值，電磁脫扣器6產(chǎn)生足夠大的吸力，將銜鐵8吸合并撞擊杠桿7，使鎖扣3脫開，三副主觸頭分斷，切斷電源。

當線路發(fā)生一般性過載時，過載電流不能使電磁脫扣器動作，但能使熱元件13產(chǎn)生一定的熱量，促使雙金屬片12受熱向上彎，推動杠桿7使搭鉤與鎖扣脫開從而將主觸頭分斷。

當線路電壓正常時，欠壓脫扣器11產(chǎn)生足夠的吸力，克服拉力彈簧9的作用將銜鐵10吸合；當線路上電壓下降到某一數(shù)值時，脫扣器吸力減小，銜鐵被拉力彈簧拉開，撞擊杠桿，主電路電源被分斷。同樣，當無電源或電壓過低時，自動空氣開關(guān)不能接通電源。Lecroy 9314AM Quad 400MHz oscilloscope
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