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交流接觸器利用主接點(diǎn)來(lái)控制電路，
用接點(diǎn)來(lái)導(dǎo)通控制回路。
主接點(diǎn)一般是常開接點(diǎn)，而接點(diǎn)常有兩對(duì)常開接點(diǎn)和常閉接點(diǎn)，小型的接觸器也經(jīng)常作為中間繼電器配合主電路使用。
交流接觸器的接點(diǎn)，由銀鎢合金制成，具有良好的導(dǎo)電性和耐高溫?zé)g性。
交流接觸器動(dòng)作的動(dòng)力源于交流通過(guò)帶鐵芯線圈產(chǎn)生的磁場(chǎng)，電磁鐵芯由兩個(gè)「山」字形的幼硅鋼片疊成，其中一個(gè)固定鐵芯，套有線圈，工作電壓可多種選擇。為了使磁力穩(wěn)定，鐵芯的吸合面加上短路環(huán)。交流接觸器在失電后，依靠彈簧復(fù)位。
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直流接觸器作為應(yīng)用廣泛的電氣開關(guān)之一，其生產(chǎn)和需求數(shù)量巨大，在正常使用過(guò)程中，電磁鐵線圈一直通電工作，產(chǎn)生電磁吸力，保證鐵芯和銜鐵吸合，帶動(dòng)動(dòng)、靜觸頭閉合，接通電路。在上述過(guò)程中，線圈本身存在電阻，持續(xù)消耗電能，這是直流接觸器主要的使用成本之一，浪費(fèi)了大量的能源和財(cái)產(chǎn)，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(guān)鍵點(diǎn)和重難點(diǎn)。直流接觸器永磁操動(dòng)機(jī)構(gòu)是一種在傳統(tǒng)直流接觸器電磁操動(dòng)機(jī)構(gòu)基礎(chǔ)上發(fā)展而來(lái)，將電磁操動(dòng)機(jī)構(gòu)和永磁鐵相結(jié)合的混合型操動(dòng)機(jī)構(gòu)，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(dòng)力，而是加入了永磁鐵對(duì)鐵心的吸引力，采用儲(chǔ)能電容充放電提供合閘、分閘電力，通常稱之為“電磁操動(dòng)，永磁保持，電子控制”。在分、合閘運(yùn)動(dòng)過(guò)程中，電磁吸力，永磁吸力與彈簧作用力共同作用，在穩(wěn)定工作過(guò)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(tài)。一則，永磁操動(dòng)機(jī)構(gòu)大量節(jié)約了保持線圈的電能消耗，環(huán)保節(jié)能。二則，永磁體保持吸合與電磁吸合相比，噪音低，無(wú)污染。三則，永磁操動(dòng)機(jī)構(gòu)剔除了電磁機(jī)構(gòu)中一系列復(fù)雜繁瑣鎖扣保護(hù)裝置，大大提高了接觸器操動(dòng)機(jī)構(gòu)的工作可靠性，降低了生產(chǎn)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(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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