結構特(te)點

XL-21型(xing)低壓(ya)動(dong)力配(pei)電(dian)(dian)(dian)箱(xiang)(xiang)系封閉(bi)式，外殼用(yong)鋼板彎制而成，刀(dao)開(kai)關操作(zuo)(zuo)手柄于箱(xiang)(xiang)前(qian)右柱(zhu)上部，可(ke)以(yi)作(zuo)(zuo)為(wei)切換電(dian)(dian)(dian)源(yuan)之用(yong)。配(pei)電(dian)(dian)(dian)箱(xiang)(xiang)前(qian)面裝(zhuang)(zhuang)(zhuang)有(you)一(yi)只電(dian)(dian)(dian)壓(ya)表，指示(shi)匯流母線(xian)的電(dian)(dian)(dian)壓(ya)。配(pei)電(dian)(dian)(dian)箱(xiang)(xiang)前(qian)面有(you)門(men)，門(men)打開(kai)后，配(pei)電(dian)(dian)(dian)箱(xiang)(xiang)內全部設(she)備敞(chang)露、便于檢修(xiu)維護。本(ben)配(pei)電(dian)(dian)(dian)箱(xiang)(xiang)均采用(yong)國內自行設(she)計的型(xing)組件，具(ju)有(you)結構緊湊(cou)，檢修(xiu)方(fang)便，線(xian)路(lu)方(fang)案(an)可(ke)以(yi)靈活組合等(deng)特點。配(pei)電(dian)(dian)(dian)箱(xiang)(xiang)除裝(zhuang)(zhuang)(zhuang)有(you)空氣斷(duan)路(lu)器和熔(rong)斷(duan)器作(zuo)(zuo)為(wei)短路(lu)保護外，還裝(zhuang)(zhuang)(zhuang)有(you)接觸器和熱繼電(dian)(dian)(dian)器，箱(xiang)(xiang)前(qian)門(men)可(ke)裝(zhuang)(zhuang)(zhuang)操作(zuo)(zuo)按鈕和指示(shi)燈。