用輔助接點來導通控制回路。
主接點一般是常開接點，而輔助接點常有兩對常開接點和常閉接點，小型的接觸器也經常作為中間繼電器配合主電路使用。
交流接觸器的接點，由銀鎢合金制成，具有良好的導電性和耐高溫燒蝕性。
交流接觸器動作的動力源于交流通過帶鐵芯線圈產生的磁場，電磁鐵芯由兩個「山」字形的幼硅鋼片疊成，其中一個固定鐵芯，套有線圈，工作電壓可多種選擇。為了使磁力穩定，鐵芯的吸合面加上短路環。交流接觸器在失電后，依靠彈簧復位。
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。
20安培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。
接觸器具可高頻率操作，做為電源開啟與切斷控制時﹐最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。
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廈門市哲控工業設備有限公司
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