DIN EN 61811-1 E:2013-07 Electromechanical telecom elementary relays of assessed quality - Part 1: Generic specification and blank detail specification
2015DIN EN 61811-1:2015 Electromechanical telecom elementary relays of assessed quality - Part 1: Generic specification and blank detail specification (IEC 61811-1:2015); German version EN 61811-1:2015
1999DIN EN 61811-1:1999 Electromechanical non-specified time all-or-nothing relays of assessed quality - Part 1: Generic specification (IEC 61811-1:1999); German version EN 61811-1:1999