結構特(te)點(dian)

XL-21型(xing)低壓動力配電(dian)(dian)箱系封閉式，外殼用(yong)鋼板彎制而(er)成，刀(dao)開關操作(zuo)手柄于箱前(qian)(qian)(qian)右柱上部，可(ke)以作(zuo)為切換(huan)電(dian)(dian)源之(zhi)用(yong)。配電(dian)(dian)箱前(qian)(qian)(qian)面裝(zhuang)有(you)一只電(dian)(dian)壓表，指示匯流(liu)母線的電(dian)(dian)壓。配電(dian)(dian)箱前(qian)(qian)(qian)面有(you)門，門打開后，配電(dian)(dian)箱內全部設備(bei)敞露、便(bian)于檢(jian)修維護。本配電(dian)(dian)箱均采用(yong)國內自行設計的型(xing)組件，具(ju)有(you)結構緊湊，檢(jian)修方便(bian)，線路(lu)方案可(ke)以靈活組合等特點。配電(dian)(dian)箱除裝(zhuang)有(you)空氣斷(duan)路(lu)器(qi)和(he)熔(rong)斷(duan)器(qi)作(zuo)為短路(lu)保護外，還裝(zhuang)有(you)接觸器(qi)和(he)熱(re)繼電(dian)(dian)器(qi)，箱前(qian)(qian)(qian)門可(ke)裝(zhuang)操作(zuo)按鈕(niu)和(he)指示燈。