結構特點

XL-21型低壓(ya)(ya)動力配(pei)電(dian)(dian)(dian)箱系封閉式，外殼用鋼板彎制而成，刀(dao)開(kai)關操作(zuo)手柄于箱前(qian)右柱上部，可(ke)以(yi)作(zuo)為(wei)切換電(dian)(dian)(dian)源之用。配(pei)電(dian)(dian)(dian)箱前(qian)面裝(zhuang)(zhuang)有(you)一(yi)只電(dian)(dian)(dian)壓(ya)(ya)表(biao)，指示(shi)匯流母線的電(dian)(dian)(dian)壓(ya)(ya)。配(pei)電(dian)(dian)(dian)箱前(qian)面有(you)門(men)(men)，門(men)(men)打(da)開(kai)后，配(pei)電(dian)(dian)(dian)箱內全部設(she)備(bei)敞露、便(bian)于檢修維護。本配(pei)電(dian)(dian)(dian)箱均采用國內自行設(she)計(ji)的型組(zu)件(jian)，具有(you)結構緊湊(cou)，檢修方(fang)便(bian)，線路(lu)方(fang)案(an)可(ke)以(yi)靈活組(zu)合等特點(dian)。配(pei)電(dian)(dian)(dian)箱除裝(zhuang)(zhuang)有(you)空氣斷路(lu)器(qi)和熔斷器(qi)作(zuo)為(wei)短路(lu)保(bao)護外，還裝(zhuang)(zhuang)有(you)接觸(chu)器(qi)和熱繼電(dian)(dian)(dian)器(qi)，箱前(qian)門(men)(men)可(ke)裝(zhuang)(zhuang)操作(zuo)按鈕和指示(shi)燈。