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IEC

PDF Standards IEC 61811-52 Ed. 2.0 b:2002

Electromechanical all-or-nothing relays – Part 52: Blank detail specification – Electromechanical all-or-nothing telecom relays of assessed quality – Two change-over contacts, 20 mm x 10 mm base
standard by International Electrotechnical Commission, 03/12/2002

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IEC

PDF Standards IEC 61643-21 Amd.1 Ed. 1.0 b:2008

Amendment 1 – Low voltage surge protective devices – Part 21: Surge protective devices connected to telecommunications and signalling networks – Performance requirements and testing methods
Amendment by International Electrotechnical Commission, 04/25/2008

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