直流接觸器作為應用廣泛的電氣開關之一，其生產和需求數量巨大，在正常使用過程中，電磁鐵線圈一直通電工作，產生電磁吸力，保證鐵芯和銜鐵吸合，帶動動、靜觸頭閉合，接通電路。在上述過程中，線圈本身存在電阻，持續消耗電能，這是直流接觸器主要的使用成本之一，浪費了大量的能源和財產，因此，如何降低直流接觸器的工作耗能，是研究直流接觸器的關鍵點和重難點。直流接觸器永磁操動機構是一種在傳統直流接觸器電磁操動機構基礎上發展而來，將電磁操動機構和永磁鐵相結合的混合型操動機構，不單單使用原有的電磁吸力和彈簧反力作為鐵心吸合與分離的動力，而是加入了永磁鐵對鐵心的吸引力，采用儲能電容充放電提供合閘、分閘電力，通常稱之為“電磁操動，永磁保持，電子控制”。在分、合閘運動過程中，電磁吸力，永磁吸力與彈簧作用力共同作用，在穩定工作過程中，采用永磁吸力代替之前的電磁吸力，保持銜鐵與鐵芯心的吸合狀態。一則，永磁操動機構大量節約了保持線圈的電能消耗，環保節能。二則，永磁體保持吸合與電磁吸合相比，噪音低，無污染。三則，永磁操動機構剔除了電磁機構中一系列復雜繁瑣鎖扣保護裝置，大大提高了接觸器操動機構的工作可靠性，降低了生產工序和成本，減小了接觸器的體積。 [1]
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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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80年代后，各國研究交流接觸器電磁鐵的無聲和節電，基本的可行方案之一是將交流電源用變壓器降壓后，再經內部整流器轉變成直流電源后供電，但此復雜控制方式并不多見。
真空接觸器：真空接觸器是接點系統采用真空消磁室的接觸器。
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、異性相吸的原理，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。3TH40220XL2
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交流接觸器利用主接點來控制電路，
用輔助接點來導通控制回路。
主接點一般是常開接點，而輔助接點常有兩對常開接點和常閉接點，小型的接觸器也經常作為中間繼電器配合主電路使用。
交流接觸器的接點，由銀鎢合金制成，具有良好的導電性和耐高溫燒蝕性。
交流接觸器動作的動力源于交流通過帶鐵芯線圈產生的磁場，電磁鐵芯由兩個「山」字形的幼硅鋼片疊成，其中一個固定鐵芯，套有線圈，工作電壓可多種選擇。為了使磁力穩定，鐵芯的吸合面加上短路環。交流接觸器在失電后，依靠彈簧復位。
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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、異性相吸的原理，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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