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加重(zhong)錘片金具之原因：

有(you)級(ji)（同音）繼電(dian)器即是(shi)四線(xian)制道岔啟動(dong)電(dian)路中(zhong)(zhong)2道岔啟動(dong)繼電(dian)器，其(qi)具有(you)定(ding)位和反(fan)(fan)位兩個穩定(ding)狀(zhuang)(zhuang)(zhuang)態（±級(ji)），在(zai)通以正向(xiang)或(huo)反(fan)(fan)向(xiang)電(dian)流時，使繼電(dian)器接(jie)(jie)(jie)點(dian)系(xi)統分(fen)別處于兩個狀(zhuang)(zhuang)(zhuang)態中(zhong)(zhong)的一個狀(zhuang)(zhuang)(zhuang)態，正向(xiang)吸起(qi)接(jie)(jie)(jie)點(dian)閉合或(huo)反(fan)(fan)向(xiang)打(da)落接(jie)(jie)(jie)點(dian)閉合，使用長條型磁鐵代替了部(bu)分(fen)軛鐵，由于磁鐵的磁力，線(xian)圈斷電(dian)，接(jie)(jie)(jie)點(dian)系(xi)統仍保持在(zai)斷電(dian)前的狀(zhuang)(zhuang)(zhuang)態，即定(ding)位吸起(qi)狀(zhuang)(zhuang)(zhuang)態勵磁電(dian)路，反(fan)(fan)位打(da)落狀(zhuang)(zhuang)(zhuang)態勵磁電(dian)路.

偏級繼電(dian)(dian)(dian)器(qi)(qi)是四線制道岔啟動電(dian)(dian)(dian)路(lu)中定位(wei)表(biao)示(shi)繼電(dian)(dian)(dian)器(qi)(qi)和反位(wei)表(biao)示(shi)繼電(dian)(dian)(dian)器(qi)(qi)，其(qi)可(ke)鑒別電(dian)(dian)(dian)流(liu)(liu)的(de)級性，在電(dian)(dian)(dian)路(lu)通(tong)以正向(xiang)電(dian)(dian)(dian)流(liu)(liu)時(shi)前接點閉(bi)合，無電(dian)(dian)(dian)或(huo)通(tong)以反向(xiang)電(dian)(dian)(dian)流(liu)(liu)時(shi)，繼電(dian)(dian)(dian)器(qi)(qi)均不動作.

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。