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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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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)和接點(diǎn)的閉合斷開(kāi)。
20A以上的接觸器加有滅弧罩，利用電路斷開(kāi)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(kāi)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(wàn)次至一千萬(wàn)次，電壽命一般則為數(shù)十萬(wàn)次至數(shù)百萬(wàn)次。
技術(shù)發(fā)展
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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、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。
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