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電路的裝置，所以經常運用于電動機做為控制對象﹐也可用作控制工廠設備﹑電熱器﹑工作母機和各樣電力機組等電力負載，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作用。接觸器控制容量大，適用于頻繁操作和遠距離控制,是自動控制系統中的重要元件之一。
在工業電氣中，接觸器的型號很多，工作電流在5A-1000A的不等，其用處相當廣泛
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半導體接觸器：半導體接觸器是一種通過改變電路回路的導通狀態和斷路狀態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，用永磁驅動機構取代傳統的電磁鐵驅動機構而形成的一種微功耗接觸器。
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按主觸點連接回路的形式分為：直
接觸器（圖5）
接觸器（圖5）
流接觸器、交流接觸器。
按操作機構分為：電磁式接觸器、永磁式接觸器。
永磁交流接觸器是利用磁極的同性相斥、用永磁驅動機構取代傳統的電磁鐵驅動機構而形成的一種微功耗接觸器國內成熟的產品型號：CJ20J、NSFC1、NSFC2、NSFC3、NSFC4、NSFC5、NSFC12、NSFC19、CJ40J、NSFMR。3TH42441XA4
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