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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。
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交流接觸器制作為一個整體，外形和性能也在不斷提高，但是功能始終不變。
接觸器（圖4）
接觸器（圖4）
無論技術的發展到什么程度，普通的交流接觸器還是有其重要的地位。
空氣式電磁接觸器（英文：Magnetic Contactor）：主要由接點系統、電磁操動系統、支架、輔助接點和外殼（或底架）組成。
因為交流電磁接觸器的線圈一般采用交流電源供電，在接觸器激磁之后，通常會有一聲高分貝的“咯”的噪音，這也是電磁式接觸器的特色。3TH40040XR1
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