DIN EN 50123-4:2003 Railway applications - Fixed installations; D.C. switchgear - Part 4: Outdoor d.c. switch-disconnectors, switch-disconnectors and earthing switches; German version EN 50123-4:2003
2014DIN EN 50123-4/A1:2014 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
2003DIN EN 50123-4:2003 Railway applications - Fixed installations; D.C. switchgear - Part 4: Outdoor d.c. switch-disconnectors, switch-disconnectors and earthing switches; German version EN 50123-4:2003
1999DIN EN 50123-4:1999 Railway applications; fixed installations - D.C. switchgear - Part 4: Outdoor d.c. in-line switch-disconnectors, disconnectors and d.c. earthing switches; German version EN 50123-4:1999