電路的裝置，所以經(jīng)常運(yùn)用于電動(dòng)機(jī)做為控制對(duì)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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80年代后，各國(guó)研究交流接觸器電磁鐵的無(wú)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(jiàn)。
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(guò)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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