結(jie)構特點

XL-21型(xing)低壓動力配電(dian)(dian)箱(xiang)(xiang)系封閉式，外殼用(yong)鋼板(ban)彎制而(er)成，刀開關(guan)操作手柄于箱(xiang)(xiang)前右(you)柱上部(bu)，可(ke)以作為(wei)切換電(dian)(dian)源之用(yong)。配電(dian)(dian)箱(xiang)(xiang)前面裝(zhuang)有(you)一只電(dian)(dian)壓表，指(zhi)示(shi)匯流母線(xian)的電(dian)(dian)壓。配電(dian)(dian)箱(xiang)(xiang)前面有(you)門，門打開后，配電(dian)(dian)箱(xiang)(xiang)內全部(bu)設備敞露、便于檢修維(wei)護(hu)。本配電(dian)(dian)箱(xiang)(xiang)均采用(yong)國內自行(xing)設計的型(xing)組(zu)件，具有(you)結構緊湊(cou)，檢修方便，線(xian)路(lu)方案可(ke)以靈(ling)活組(zu)合等特點。配電(dian)(dian)箱(xiang)(xiang)除(chu)裝(zhuang)有(you)空氣斷路(lu)器和熔(rong)斷器作為(wei)短路(lu)保護(hu)外，還裝(zhuang)有(you)接(jie)觸器和熱繼(ji)電(dian)(dian)器，箱(xiang)(xiang)前門可(ke)裝(zhuang)操作按鈕(niu)和指(zhi)示(shi)燈。