EN IEC 61643-11:2025/A11:2025

Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods

Überspannungsschutzgeräte für Niederspannung - Teil 11: Überspannungsschutzgeräte für den Einsatz in Niederspannungs-Wechselstromnetzen - Anforderungen und Prüfverfahren

Parafoudres basse tension - Partie 11: Parafoudres connectés aux réseaux basse tension en courant alternatif - Exigences et méthodes d’essai

Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 11. del: Naprave za zaščito pred prenapetostnimi udari za nizkonapetostne napajalne sisteme AC - Zahteve in preskusne metode - Dopolnilo A11

General Information

• Status: Published
• Publication Date: 20-Nov-2025
• ICS: 29.240.10 - Substations. Surge arresters
• Technical Committee: CLC/TC 37A - Low voltage surge protective devices
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 21-Nov-2025
• Due Date: 15-Dec-2025
• Completion Date: 21-Nov-2025
• Directive: Harmonized Standard2014/35/EU - 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
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: SIST EN IEC 61643-11:2026/A11:2026 - Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods

Relations

• Amends: EN IEC 61643-11:2025 - Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods
• Effective Date: 10-Oct-2023
• Amends: prEN IEC 61643-11:2023 {frag 2} - Voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods
• Effective Date: 10-Oct-2023

Overview

EN IEC 61643-11:2025/A11:2025 is an amendment to the European standard governing surge protective devices (SPDs) for low-voltage AC power systems. This standard, published by CENELEC (CLC), specifies requirements and test methods for SPDs designed to protect electrical equipment from overvoltages caused by lightning or switching operations. The amendment clarifies regulatory alignment and harmonization requirements, strengthening the link to essential safety objectives under the Low Voltage Directive (LVD) 2014/35/EU.

Organizations and manufacturers involved in designing, installing, or certifying low-voltage SPDs will find this standard crucial for ensuring the quality, reliability, and safety of electrical infrastructure.

Key Topics

EN IEC 61643-11:2025/A11:2025 covers several key aspects related to the selection and testing of surge protective devices:

• Requirements for SPDs: Outlines essential characteristics and performance criteria for devices protecting AC low-voltage power systems.
• Test Methods: Specifies test procedures to verify that SPDs perform correctly under expected surge and fault conditions.
• Amendments to Test Procedures: Updates and streamlines test conditions, including modifications to requirements for temporary overvoltages (TOVs) and test voltage tables.
• Harmonization with EU Legislation: Aligns the standard’s requirements with the safety objectives of Directive 2014/35/EU, providing a presumption of conformity for manufacturers.
• Normative References: Updates key references to other international and European standards relevant to low-voltage electrical installations and equipment.

Applications

The scope and content of EN IEC 61643-11:2025/A11:2025 make it highly relevant to multiple stakeholders in the electrical and building technology sectors:

• Manufacturers of SPDs: Ensures devices meet minimum safety and performance benchmarks required for European markets.
• Electrical System Designers: Assists in specifying compliant surge protection solutions for AC low-voltage power networks in commercial, industrial, and residential buildings.
• Testing Laboratories: Provides updated guidelines for verifying SPD conformity through comprehensive testing processes.
• Installers and Inspectors: Offers clear criteria for selecting and assessing surge protection components to reduce system downtime and increase equipment lifespan.
• Compliance and Certification Bodies: Supports documentation and assessment processes needed to demonstrate compliance with EU directives, particularly the LVD.

Proper installation and selection of surge protective devices in line with this standard can:

• Enhance operational reliability of electrical systems.
• Prevent costly equipment damage due to transient overvoltages.
• Support legal and insurance requirements for electrical installations.

Related Standards

EN IEC 61643-11:2025/A11:2025 references and works in conjunction with several foundational standards in the field of electrical power system protection, including:

• IEC 60364-4-44: Low-voltage electrical installations - Protection for safety against voltage disturbances and electromagnetic disturbances.
• IEC 60947-1: Low-voltage switchgear and controlgear - General rules.
• IEC 61643-01: Low-voltage surge protective devices - General requirements and test methods.
• HD 60364 Series: European harmonized standards for low-voltage electrical installations.

These related standards provide the broader framework for electrical safety, equipment protection, and quality assurance across Europe’s electrical infrastructure.

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Adherence to EN IEC 61643-11:2025/A11:2025 ensures that surge protective devices are fit for purpose, built to recognized safety standards, and compliant with crucial EU directives, protecting both investments and end users in the electrical industry.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2026
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 11. del: Naprave
za zaščito pred prenapetostnimi udari za nizkonapetostne napajalne sisteme AC -
Zahteve in preskusne metode - Dopolnilo A11
Low-voltage surge protective devices - Part 11: Surge protective devices connected to
AC low-voltage power systems - Requirements and test methods
Überspannungsschutzgeräte für Niederspannung - Teil 11: Überspannungsschutzgeräte
für den Einsatz in Niederspannungs-Wechselstromnetzen - Anforderungen und
Prüfverfahren
Parafoudres basse tension - Partie 11: Parafoudres connectés aux systèmes basse
tension - Exigences et méthodes d'essai
Ta slovenski standard je istoveten z: EN IEC 61643-11:2025/A11:2025
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61643-11:2025/A11

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2025
ICS 29.240.10
English Version
Low-voltage surge protective devices - Part 11: Surge protective
devices connected to AC low-voltage power systems -
Requirements and test methods
Parafoudres basse tension - Partie 11: Parafoudres Überspannungsschutzgeräte für Niederspannung - Teil 11:
connectés aux réseaux basse tension en courant alternatif - Überspannungsschutzgeräte für den Einsatz in
Exigences et méthodes d'essai Niederspannungs-Wechselstromnetzen - Anforderungen
und Prüfverfahren
This amendment A11 modifies the European Standard EN IEC 61643-11:2025; it was approved by CENELEC on 2025-09-08. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the
status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as
the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61643-11:2025/A11:2025 E

Contents Page
European foreword . 3
1 Modifications to the Scope . 4
2 Modification to 9.3.9.100.1, “TOVs caused by faults in the low voltage system” . 4
3 Modifications to 9.3.9.101.1, “Test procedure” . 4
4 Modification to Table BB.1, “Test voltage values” . 4
5 Deletion of Table BB.2, “Test voltage values for Japanese systems”. . 4
6 Deletion of Clause CC.3, “Other TOV ratings for specific distribution systems or
countries” . 4
Annex ZA (normative) Normative references to international publications with their
corresponding European publications . 5
Annex ZZ (informative) Relationship between this European standard and the safety objectives
of Directive 2014/35/EU [2014 OJ L96] aimed to be covered . 6
European foreword
This document (EN IEC 61643-11:2025/A11:2025) has been prepared by Technical Committee CLC/TC 37A
“Low voltage surge protective devices”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2026-10-31
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2028-10-31
conflicting with this document have to be
withdrawn
Clauses, subclauses, notes, tables, figures and annexes which are additional to those in
CDV IEC 61643-11 ED2 are prefixed “Z”.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CENELEC by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZZ, which is an integral part of this document.
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