結(jie)構特(te)點

XL-21型(xing)低(di)壓(ya)動(dong)力配(pei)(pei)電(dian)(dian)(dian)箱(xiang)(xiang)(xiang)系(xi)封閉式，外(wai)殼用(yong)鋼(gang)板彎制而成，刀開關操(cao)作(zuo)手柄于箱(xiang)(xiang)(xiang)前(qian)(qian)右柱上(shang)部，可以(yi)作(zuo)為切換電(dian)(dian)(dian)源之用(yong)。配(pei)(pei)電(dian)(dian)(dian)箱(xiang)(xiang)(xiang)前(qian)(qian)面裝有一(yi)只電(dian)(dian)(dian)壓(ya)表，指(zhi)示(shi)匯(hui)流母線(xian)的電(dian)(dian)(dian)壓(ya)。配(pei)(pei)電(dian)(dian)(dian)箱(xiang)(xiang)(xiang)前(qian)(qian)面有門(men)，門(men)打開后，配(pei)(pei)電(dian)(dian)(dian)箱(xiang)(xiang)(xiang)內全部設(she)備敞露、便(bian)于檢(jian)修維護。本配(pei)(pei)電(dian)(dian)(dian)箱(xiang)(xiang)(xiang)均采用(yong)國內自行設(she)計的型(xing)組件，具(ju)有結構(gou)緊湊，檢(jian)修方(fang)便(bian)，線(xian)路方(fang)案可以(yi)靈活(huo)組合等特點。配(pei)(pei)電(dian)(dian)(dian)箱(xiang)(xiang)(xiang)除裝有空氣斷(duan)路器(qi)和(he)熔斷(duan)器(qi)作(zuo)為短路保護外(wai)，還裝有接觸(chu)器(qi)和(he)熱(re)繼電(dian)(dian)(dian)器(qi)，箱(xiang)(xiang)(xiang)前(qian)(qian)門(men)可裝操(cao)作(zuo)按鈕和(he)指(zhi)示(shi)燈。