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加重(zhong)錘(chui)片金具(ju)之(zhi)原因：

有(you)級(ji)（同音）繼(ji)電(dian)(dian)器即是(shi)四線制道(dao)岔啟動電(dian)(dian)路中2道(dao)岔啟動繼(ji)電(dian)(dian)器，其(qi)具有(you)定(ding)位和反位兩個(ge)穩(wen)定(ding)狀(zhuang)態(tai)（±級(ji)），在通以正向或反向電(dian)(dian)流時，使繼(ji)電(dian)(dian)器接點(dian)(dian)系(xi)統分別處于兩個(ge)狀(zhuang)態(tai)中的一個(ge)狀(zhuang)態(tai)，正向吸起接點(dian)(dian)閉合或反向打(da)落接點(dian)(dian)閉合，使用長條型磁(ci)(ci)(ci)鐵代替(ti)了(le)部分軛(e)鐵，由(you)于磁(ci)(ci)(ci)鐵的磁(ci)(ci)(ci)力，線圈斷(duan)電(dian)(dian)，接點(dian)(dian)系(xi)統仍(reng)保持(chi)在斷(duan)電(dian)(dian)前的狀(zhuang)態(tai)，即定(ding)位吸起狀(zhuang)態(tai)勵(li)磁(ci)(ci)(ci)電(dian)(dian)路，反位打(da)落狀(zhuang)態(tai)勵(li)磁(ci)(ci)(ci)電(dian)(dian)路.

偏級繼電(dian)(dian)器是四線制(zhi)道岔(cha)啟動電(dian)(dian)路中定位(wei)表示繼電(dian)(dian)器和反位(wei)表示繼電(dian)(dian)器，其可(ke)鑒(jian)別電(dian)(dian)流的級性，在電(dian)(dian)路通(tong)以正向(xiang)電(dian)(dian)流時(shi)前接點閉合(he)，無電(dian)(dian)或通(tong)以反向(xiang)電(dian)(dian)流時(shi)，繼電(dian)(dian)器均不(bu)動作.

直流無級繼電器即是信號機點燈電路中的信號繼電器，當給線圈通以標定的工作電流，電磁鐵勵磁帶動接點系統，使前接點與中接點閉合，線圈斷電或電流下降達不到規定數值，靠接點簧 片彈力和重錘片重力使中接點與前接點斷開，與后接點閉合，使用或加重錘片是為了從結構上保證繼電器接點可靠閉合或斷開。