電路的裝置，所以經(jīng)常運(yùn)用于電動(dòng)機(jī)做為控制對象﹐也可用作控制工廠設(shè)備﹑電熱器﹑工作母機(jī)和各樣電力機(jī)組等電力負(fù)載，接觸器不僅能接通和切斷電路，而且還具有低電壓釋放保護(hù)作用。接觸器控制容量大，適用于頻繁操作和遠(yuǎn)距離控制,是自動(dòng)控制系統(tǒng)中的重要元件之一。
在工業(yè)電氣中，接觸器的型號(hào)很多，工作電流在5A-1000A的不等，其用處相當(dāng)廣泛
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另一半是活動(dòng)鐵芯，構(gòu)造和固定鐵芯一樣，用以帶動(dòng)主接點(diǎn)和輔助接點(diǎn)的閉合斷開。
20A以上的接觸器加有滅弧罩，利用電路斷開時(shí)產(chǎn)生的電磁力，快速拉斷電弧，保護(hù)接點(diǎn)。
接觸器可高頻率操作，做為電源開啟與切斷控制時(shí)﹐高操作頻率可達(dá)每小時(shí)1200次。
接觸器的使用壽命很高，機(jī)械壽命通常為數(shù)百萬次至一千萬次，電壽命一般則為數(shù)十萬次至數(shù)百萬次。
技術(shù)發(fā)展
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80年代后，各國研究交流接觸器電磁鐵的無聲和節(jié)電，基本的可行方案之一是將交流電源用變壓器降壓后，再經(jīng)內(nèi)部整流器轉(zhuǎn)變成直流電源后供電，但此復(fù)雜控制方式并不多見。
真空接觸器：真空接觸器是接點(diǎn)系統(tǒng)采用真空消磁室的接觸器。
半導(dǎo)體接觸器：半導(dǎo)體接觸器是一種通過改變電路回路的導(dǎo)通狀態(tài)和斷路狀態(tài)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(qū)動(dòng)機(jī)構(gòu)取代傳統(tǒng)的電磁鐵驅(qū)動(dòng)機(jī)構(gòu)而形成的一種微功耗接觸器。3TH40220XL2
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交流接觸器制作為一個(gè)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(shù)的發(fā)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(diǎn)系統(tǒng)、電磁操動(dòng)系統(tǒng)、支架、輔助接點(diǎn)和外殼（或底架）組成。
因?yàn)榻涣麟姶沤佑|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(huì)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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