10.99 New project approved Feb 26, 2026
CENELEC
CLC/TC 37A Low voltage surge protective devices
European Norm
This document, together with IEC 61643-01:2024, is applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages.
These devices are intended to be connected to telecommunications and signalling networks, and equipment rated up to 1 000 V RMS and 1 500 V DC.
These telecommunications and signalling networks can also provide power on the same line, e.g. Power over Ethernet (PoE).
Performance and safety requirements, tests and ratings are specified in this document. These devices contain at least one voltage-limiting component (clamping or switching) and are intended to limit surge voltages and divert surge currents.
Legislation related to this standard
Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
PUBLISHED
EN IEC 61643-21:2026
IN_DEVELOPMENT
EN IEC 61643-21:2026/prAA
10.99
New project approved
Feb 26, 2026
