結構(gou)特點

XL-21型(xing)低壓(ya)(ya)動(dong)力配(pei)(pei)電(dian)(dian)(dian)(dian)箱(xiang)系封閉式(shi)，外殼(ke)用鋼板(ban)彎制而成，刀開關(guan)操(cao)作手柄于箱(xiang)前(qian)(qian)右柱(zhu)上部，可(ke)以(yi)作為切換電(dian)(dian)(dian)(dian)源之用。配(pei)(pei)電(dian)(dian)(dian)(dian)箱(xiang)前(qian)(qian)面裝有一只電(dian)(dian)(dian)(dian)壓(ya)(ya)表，指(zhi)示匯流母線的電(dian)(dian)(dian)(dian)壓(ya)(ya)。配(pei)(pei)電(dian)(dian)(dian)(dian)箱(xiang)前(qian)(qian)面有門(men)，門(men)打開后(hou)，配(pei)(pei)電(dian)(dian)(dian)(dian)箱(xiang)內全部設(she)備敞(chang)露、便于檢修維護。本配(pei)(pei)電(dian)(dian)(dian)(dian)箱(xiang)均采用國內自行設(she)計的型(xing)組(zu)件(jian)，具有結構緊湊(cou)，檢修方(fang)便，線路(lu)方(fang)案可(ke)以(yi)靈活(huo)組(zu)合(he)等特點。配(pei)(pei)電(dian)(dian)(dian)(dian)箱(xiang)除裝有空(kong)氣(qi)斷(duan)路(lu)器(qi)和熔斷(duan)器(qi)作為短路(lu)保護外，還(huan)裝有接觸器(qi)和熱繼電(dian)(dian)(dian)(dian)器(qi)，箱(xiang)前(qian)(qian)門(men)可(ke)裝操(cao)作按鈕和指(zhi)示燈。