結構(gou)特點

XL-21型(xing)低壓動力(li)配電(dian)(dian)(dian)(dian)箱(xiang)系封閉式，外殼用鋼板彎制而成，刀開關操(cao)作手柄于箱(xiang)前右(you)柱上部(bu)，可(ke)以(yi)作為切換電(dian)(dian)(dian)(dian)源之用。配電(dian)(dian)(dian)(dian)箱(xiang)前面裝(zhuang)(zhuang)(zhuang)有(you)一只電(dian)(dian)(dian)(dian)壓表，指示匯流母線的(de)電(dian)(dian)(dian)(dian)壓。配電(dian)(dian)(dian)(dian)箱(xiang)前面有(you)門，門打(da)開后(hou)，配電(dian)(dian)(dian)(dian)箱(xiang)內(nei)全部(bu)設備敞露、便于檢修(xiu)維護。本(ben)配電(dian)(dian)(dian)(dian)箱(xiang)均采用國內(nei)自行設計的(de)型(xing)組件，具有(you)結構緊湊，檢修(xiu)方便，線路方案(an)可(ke)以(yi)靈活組合等特點。配電(dian)(dian)(dian)(dian)箱(xiang)除裝(zhuang)(zhuang)(zhuang)有(you)空氣斷路器(qi)(qi)和(he)熔斷器(qi)(qi)作為短路保護外，還裝(zhuang)(zhuang)(zhuang)有(you)接觸器(qi)(qi)和(he)熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)，箱(xiang)前門可(ke)裝(zhuang)(zhuang)(zhuang)操(cao)作按(an)鈕和(he)指示燈。