EN IEC 61643-11:2025/A11:2025
(Amendment)Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods
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
Relations
Overview
The EN IEC 61643-11:2025/A11:2025 standard specifies requirements and test methods for low-voltage surge protective devices (SPDs) connected to AC low-voltage power systems. Developed by CLC (European Committee for Electrotechnical Standardization), this amendment updates and refines the existing EN IEC 61643-11:2025 standard to ensure enhanced safety, reliability, and performance of SPDs in electrical installations across Europe.
Surge protective devices are critical components designed to protect electrical systems and equipment from transient overvoltages caused by lightning strikes, switching operations, or faults in power distribution systems. This standard defines the technical criteria for the design, testing, and performance evaluation of SPDs used in low-voltage AC power networks.
Key Topics
Scope Modifications
The scope of the standard has been adjusted for clarity, with previous exceptions based on risk assessments for specific power applications removed. This ensures all SPDs adhere uniformly to the updated requirements.Test Procedures and Voltage Values
Amendments include the deletion of certain test voltage tables specific to distribution configurations (e.g., three-phase delta systems, Japanese systems), streamlining the testing framework. The test procedure revisions remove ambiguous allowances for alternative test setups, enforcing stricter consistency in SPD evaluation.Temporary Overvoltages (TOVs)
Changes related to TOVs caused by faults in low voltage systems focus on refining test conditions and removing explanatory notes that could lead to inconsistent interpretations.Normative References
The amendment aligns the standard with international publications like IEC 60947-1 and IEC 61643-01, ensuring cohesive integration with related electrical safety standards and harmonization across European regulations.Compliance with EU Directives
EN IEC 61643-11:2025/A11:2025 fulfills the safety objectives of the European Low Voltage Directive 2014/35/EU, enabling manufacturers to demonstrate conformity and CE marking for electrical equipment with surge protection.
Applications
This standard applies to the design, manufacture, and testing of surge protective devices in:
Residential and commercial low-voltage AC power systems
Protecting homes, offices, and industrial premises from transient voltage surges to safeguard electrical installations and sensitive equipment.Electrical substations and distribution networks
Ensuring surge arresters and protection devices perform reliably under varying network conditions to maintain power quality and safety.Electrical switchgear and controlgear assemblies
Integrating SPDs compliant with this standard into switchboards and control panels to mitigate damage from transient overvoltages.Renewable energy systems and low-voltage installations
Protecting inverter outputs and associated low-voltage circuits connected to alternating current (AC) networks.
Implementing devices in accordance with EN IEC 61643-11:2025/A11 ensures enhanced durability, reliability, and compliance with essential safety and performance requirements, minimizing downtime and costly equipment failures due to electrical surges.
Related Standards
EN IEC 61643-11:2025/A11 closely relates to several key international and European standards, including:
EN IEC 61643-01:2025 – General requirements and test methods for low-voltage surge protective devices, providing foundational definitions and classifications.
IEC 60947-1 – Low-voltage switchgear and controlgear – General rules, relevant for the integration of SPDs into switchgear.
IEC 60364-4-44 – Low-voltage electrical installations – Protection against voltage disturbances and electromagnetic disturbances.
These related standards complement EN IEC 61643-11 by covering broader aspects of electrical safety, installation practices, and device interoperability.
Summary
EN IEC 61643-11:2025/A11:2025 defines stringent requirements and test methods for surge protective devices used in AC low-voltage power systems, ensuring consistent protection against transient overvoltages. This amendment advances the harmonization of European electrical safety standards, aligning with EU directives and reflecting current technical advancements. Professionals designing and implementing electrical protection systems will benefit from adhering to this updated standard to guarantee safety, compliance, and enhanced surge resilience in low-voltage installations.
Frequently Asked Questions
EN IEC 61643-11:2025/A11:2025 is a amendment published by CLC. Its full title is "Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods". This standard covers: Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods
Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods
EN IEC 61643-11:2025/A11:2025 is classified under the following ICS (International Classification for Standards) categories: 29.240.10 - Substations. Surge arresters. The ICS classification helps identify the subject area and facilitates finding related standards.
EN IEC 61643-11:2025/A11:2025 has the following relationships with other standards: It is inter standard links to EN IEC 61643-11:2025, prEN IEC 61643-11:2023 {frag 2}. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN IEC 61643-11:2025/A11:2025 is associated with the following European legislation: EU Directives/Regulations: 2014/35/EU; Standardization Mandates: M/511. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN IEC 61643-11:2025/A11:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
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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