交流接觸器利用主接點(diǎn)來(lái)開閉電路，
用輔助接點(diǎn)來(lái)導(dǎo)通控制回路。
主接點(diǎn)一般是常開接點(diǎn)，而輔助接點(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。
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)和輔助接點(diǎn)的閉合斷開。
20安培以上的接觸器加有滅弧罩，利用電路斷開時(shí)產(chǎn)生的電磁力，快速拉斷電弧，保護(hù)接點(diǎn)。
接觸器具可高頻率操作，做為電源開啟與切斷控制時(shí)﹐最高操作頻率可達(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。
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廈門市哲控工業(yè)設(shè)備有限公司
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聯(lián)系人：小莉
手機(jī)/微信同號(hào)：13400637411
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