DIN EN 50123-4/A1-2014 轨道交通.固定设备.直流开关装置.第4部分:室外直流隔离开关、隔离开关和接地开关.德文版本EN 50123-4-2003/A1-2013
Railway applications - Fixed installations - D.C. switchgear - Part 4: Outdoor d.c. disconnectors, switch-disconnectors and earthing switches; German version EN 50123-4:2003/A1:2013