(?) (?)在(Zai)低(Di)压(Ya)供(Gong)电(Dian)系(Xi)统(Tong)末(Mo)端(Duan)负(Fu)责(Ze)完(Wan)成(Cheng)电(Dian)能(Neng)控(Kong)制(Zhi)、(?)保(Bao)护(Hu)、(?)转(Zhuan)换(Huan)和(He)分(Fen)配(Pei)的(De)设(She)备(Bei)。(?)常(Chang)见(Jian)型(Xing)号(Hao)PZ-30.主(Zhu)要(Yao)由(You)电(Dian)线(Xian)、(?)元(Yuan)器(Qi)件(Jian)(隔(Ge)离(Li)开(Kai)关(Guan)、(?)断(Duan)路(Lu)器(Qi)等(Deng))及(Ji)箱(Xiang)体(Ti)等(Deng)组(Zu)成(Cheng)。(?)