電磁式繼電器一般由鐵芯、線圈、銜鐵、觸點簧片等組成的。只要在線圈兩端加上一定的電壓，線圈中就會流過一定的電流，從而產(chǎn)生電磁效應，銜鐵就會在電磁力吸引的作用下克服返回彈簧的拉力吸向鐵芯，從而帶動銜鐵的動觸點（常開觸點）與靜觸點（常閉觸點）吸合。當線圈斷電后，電磁的吸力也隨之消失，銜鐵就會在彈簧的反作用力返回原來的位置，使動觸點與原來的靜觸點釋放。這樣吸合、釋放，從而達到了在電路中的導通、切斷的目的。對于繼電器的“常開、常閉”觸點，可以這樣來區(qū)分：繼電器線圈未通電時處于斷開狀態(tài)的靜觸點，稱為“常開觸點”；處于接通狀態(tài)的靜觸點稱為“常閉觸點”。
廈門市哲控工業(yè)設(shè)備有限公司
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