交流接觸器利用主接點來控制電路，
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。
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直流電流與交流電流相比較，不存在周期性的電流數值過零點，因此，傳統接觸器開斷電路時，觸頭之間產生的電弧較為強烈，燃弧時間也比較長，以便充分釋放電路中剩余的能量。電弧的燃燒產生高溫和強光，對觸頭表面有嚴重的燒蝕作用，觸頭材料在多次開斷之后逐漸流失，觸頭電磨損嚴重時，導致直流接觸器報廢，不能開斷電路。 [1]
電力電子技術得以迅猛發展，人們將電力電子元件應用到直流接觸器中，巧妙的創造出一種混合式直流接觸器，使得直流接觸器向智能化、可控化邁進了新的一步。這種混合式接觸器利用傳統直流接觸器在閉合導通狀態下觸頭接觸電阻小、導通壓降小的優點，將由反并聯晶閘管和控制模塊單元共同組成的無觸點開關并聯在傳統直流接觸器觸頭上。這種無觸點的電力電子開關分斷電路時不產生電弧，這就避免了傳統接觸器中電弧對觸頭材料的電磨損，也就大大增加了觸頭的使用壽命和可靠性。 [1]
直流接觸器永磁機構
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