DIN EN 50123-5/A1-1999 轨道交通.固定设备.直流开关设备.第5部分:直流系统专用电涌放电器与低压限制器,修改件1
Railway applications - Fixed installations; D.C. switchgear - Part 5: Surge arresters and low-voltage limiters for specific use in d.c. systems; Amendment A1; German version EN 50123-5:1997/A1:1999