交流接觸器利用主接點(diǎn)來控制電路，
用輔助接點(diǎn)來導(dǎo)通控制回路。
主接點(diǎn)一般是常開接點(diǎn)，而輔助接點(diǎn)常有兩對常開接點(diǎn)和常閉接點(diǎn)，小型的接觸器也經(jīng)常作為中間繼電器配合主電路使用。
交流接觸器的接點(diǎn)，由銀鎢合金制成，具有良好的導(dǎo)電性和耐高溫?zé)g性。
交流接觸器動作的動力源于交流通過帶鐵芯線圈產(chǎn)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(wěn)定，鐵芯的吸合面加上短路環(huán)。交流接觸器在失電后，依靠彈簧復(fù)位。
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