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熱繼電器是利用電流的熱效應原理實現電機的過載保護的。

電動機在工作時，當負載過大、電壓過低或發生一相斷路故障時，電動機的電流都要增大，其值往往超過額定電流。如果超過不多，電路中熔斷器的熔體不會熔斷，但時間長了會影響電動機的壽命，甚至燒毀電動機，因此需要有過載保護。熱繼電器用于電動機的過載保護，它是利用電流熱效應使雙金屬片受熱后彎曲，通過聯動機構使觸點動作的自動電器。圖1-23是熱繼電器的結構及圖形符號。

它由發熱元件、雙金屬片、觸點及一套傳動和調整機構組成。發熱元件是一段阻值不大的電阻絲，串接在被保護電動機的主電路中。雙金屬片由兩種不同熱膨脹系數的金屬片輾壓而成。圖中所示的雙金屬片，下層一片的熱膨脹系數大，上層的小。當電動機過載時，通過發熱元件的電流超過整定電流，雙金屬片受熱向上彎曲脫離扣板，使常閉觸點斷開。由于常閉觸點是接在電動機的控制電路中的，它的斷開會使得與其相接的接觸器線圈斷電，從而接觸器主觸點斷開，電動機的主電路斷電，實現了過載保護。

備貨，備貨，降降降，火火火，火火火……
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公司名稱：廈門泰尼電氣有限公司
聯系人：小黃（銷售代表）
聯系電話：0592-6809319
傳真號碼：0592-6890859（麻煩備注01006收）
手機：189-5019-1386微信同號
QQ號碼:2917675397
地址：廈門市海滄區海滄農場海農北里17號
誠信經營，質量為首，誠信至上，泰尼電氣小黃竭誠為您服務！！！
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