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lahtj 发表于 2013-10-23 06:29:47

求 IEC 61643-21:2012 Low voltage surge protective devices – Part 21

IEC 61643-21:2012 Low voltage surge protective devices – Part 21: Surge protective devices connected to telecommunications and signalling networks – Performance requirements and testing methods - Edition 1.2; Consolidated Reprint

sigh007 发表于 2013-10-23 06:29:48

IEC 61643-21:2012
http://bbs.infoeach.com/forum.php?mod=viewthread&tid=36620&fromuid=1

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