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加重錘片金具之原因：

有(you)級(ji)（同音）繼電(dian)(dian)器即(ji)是四線(xian)(xian)制道岔啟動(dong)電(dian)(dian)路(lu)中2道岔啟動(dong)繼電(dian)(dian)器，其具有(you)定(ding)位(wei)和反位(wei)兩個穩定(ding)狀(zhuang)(zhuang)態(tai)(tai)（±級(ji)），在通以正(zheng)(zheng)向或(huo)反向電(dian)(dian)流時，使繼電(dian)(dian)器接(jie)(jie)點(dian)(dian)系(xi)統分別處于兩個狀(zhuang)(zhuang)態(tai)(tai)中的(de)一個狀(zhuang)(zhuang)態(tai)(tai)，正(zheng)(zheng)向吸起接(jie)(jie)點(dian)(dian)閉合或(huo)反向打(da)落(luo)接(jie)(jie)點(dian)(dian)閉合，使用長條型磁(ci)鐵(tie)代替了部分軛鐵(tie)，由于磁(ci)鐵(tie)的(de)磁(ci)力，線(xian)(xian)圈斷電(dian)(dian)，接(jie)(jie)點(dian)(dian)系(xi)統仍保持在斷電(dian)(dian)前的(de)狀(zhuang)(zhuang)態(tai)(tai)，即(ji)定(ding)位(wei)吸起狀(zhuang)(zhuang)態(tai)(tai)勵磁(ci)電(dian)(dian)路(lu)，反位(wei)打(da)落(luo)狀(zhuang)(zhuang)態(tai)(tai)勵磁(ci)電(dian)(dian)路(lu).

偏(pian)級(ji)繼(ji)(ji)電(dian)(dian)器是(shi)四線制道(dao)岔啟動電(dian)(dian)路(lu)中(zhong)定位(wei)表示繼(ji)(ji)電(dian)(dian)器和(he)反位(wei)表示繼(ji)(ji)電(dian)(dian)器，其可鑒(jian)別電(dian)(dian)流的級(ji)性，在(zai)電(dian)(dian)路(lu)通(tong)以正向(xiang)電(dian)(dian)流時前接點閉合(he)，無(wu)電(dian)(dian)或通(tong)以反向(xiang)電(dian)(dian)流時，繼(ji)(ji)電(dian)(dian)器均不動作.

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。