
Low Voltage Surge Protective Devices - Part 21: Surge Protective Devices Connected To Telecommunications And Signalling Networks - Performance Requirements And Testing Methods
出版:German Institute for Standardisation (Deutsches Institut für Normung)

专家解读视频
2010 [01/03/2010]2002 [01/03/2002]
Supersedes DIN EN 61644-21. (03/2002) DRAFT AMD 2 issued in November 2011. (12/2011)
SS EN 61643-21 Ed. 1 (2002) - Identical
BS EN 61643-21:2001+A1:2009 - Identical
NF EN 61643-21:2001 - Identical
NBN EN 61643-21:2002 - Identical
UNE EN 61643-21:2002 - Identical