ZW7-40.5型戶(hu)外高(gao)壓真空斷(duan)路器(qi)用(yong)于(yu)交流50Hz。電(dian)話(hua)40 5kV的(de)三相電(dian)力(li)係(xi)統,作(zuò)爲(wei)分(fēn)斷(duan),關郃(he)負荷電(dian)流過(guo)載電(dian)流及(ji)短路電(dian)流之(zhi)用(yong)。