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加(jia)重錘片金具(ju)之(zhi)原因：

有級（同(tong)音）繼電器(qi)(qi)即(ji)是四線制道岔(cha)啟(qi)動(dong)電路中2道岔(cha)啟(qi)動(dong)繼電器(qi)(qi)，其具(ju)有定(ding)位(wei)(wei)(wei)和反(fan)位(wei)(wei)(wei)兩個穩(wen)定(ding)狀(zhuang)(zhuang)態(tai)（±級），在通以(yi)正(zheng)向(xiang)或反(fan)向(xiang)電流時，使繼電器(qi)(qi)接(jie)點(dian)系(xi)統(tong)分別處(chu)于兩個狀(zhuang)(zhuang)態(tai)中的(de)一個狀(zhuang)(zhuang)態(tai)，正(zheng)向(xiang)吸起(qi)(qi)接(jie)點(dian)閉合或反(fan)向(xiang)打落(luo)接(jie)點(dian)閉合，使用長條型(xing)磁鐵(tie)代替了部(bu)分軛(e)鐵(tie)，由于磁鐵(tie)的(de)磁力，線圈斷電，接(jie)點(dian)系(xi)統(tong)仍保持(chi)在斷電前的(de)狀(zhuang)(zhuang)態(tai)，即(ji)定(ding)位(wei)(wei)(wei)吸起(qi)(qi)狀(zhuang)(zhuang)態(tai)勵磁電路，反(fan)位(wei)(wei)(wei)打落(luo)狀(zhuang)(zhuang)態(tai)勵磁電路.

偏(pian)級繼(ji)電(dian)(dian)(dian)(dian)器(qi)是四線制(zhi)道岔啟動電(dian)(dian)(dian)(dian)路中(zhong)定位表示繼(ji)電(dian)(dian)(dian)(dian)器(qi)和反位表示繼(ji)電(dian)(dian)(dian)(dian)器(qi)，其可鑒別電(dian)(dian)(dian)(dian)流(liu)的級性，在(zai)電(dian)(dian)(dian)(dian)路通以(yi)正向電(dian)(dian)(dian)(dian)流(liu)時(shi)前接(jie)點(dian)閉(bi)合，無電(dian)(dian)(dian)(dian)或(huo)通以(yi)反向電(dian)(dian)(dian)(dian)流(liu)時(shi)，繼(ji)電(dian)(dian)(dian)(dian)器(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。