3TD48020XL0
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接觸器的工作原理是：當接觸器線圈通電后，線圈電流會產生磁場，
產生的磁場使靜鐵芯產生電磁吸力吸引動鐵芯，并帶動交流接觸器點動作，常閉觸點斷開，常開觸點閉合，兩者是聯動的。當線圈斷電時，電磁吸力消失，銜鐵在釋放彈簧的作用下釋放，使觸點復原，常開觸點斷開，常閉觸點閉合。直流接觸器的工作原理跟溫度開關的原理有點相似。
3TF51220XB0
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半導體接觸器：半導體接觸器是一種通過改變電路回路的導通狀態和斷路狀態而完成電流操作的接觸器。
永磁接觸器：永磁交流接觸器是利用磁極的同性相斥、異性相吸的原理，用永磁驅動機構取代傳統的電磁鐵驅動機構而形成的一種微功耗接觸器。
3TH40311XM4
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另一半是活動鐵芯，構造和固定鐵芯一樣，用以帶動主接點和輔助接點的閉合斷開。
20A以上的接觸器加有滅弧罩，利用電路斷開時產生的電磁力，快速拉斷電弧，保護接點。
接觸器可高頻率操作，做為電源開啟與切斷控制時﹐高操作頻率可達每小時1200次。
接觸器的使用壽命很高，機械壽命通常為數百萬次至一千萬次，電壽命一般則為數十萬次至數百萬次。
技術發展
3TH30310XM0
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