SIST EN IEC 61643-41:2025/A11:2025

Überspannungsschutzgeräte für Niederspannung - Teil 41: Überspannungsschutzgeräte für den Einsatz in Niederspannungs-Gleichstromnetzen - Anforderungen und Prüfverfahren

Parafoudres basse tension - Partie 41: Parafoudres connectés aux réseaux basse tension en courant continu - Exigences et méthodes d’essai

Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 41. del: Naprave za zaščito pred prenapetostnimi udari za nizkonapetostne DC napajalne sisteme - Zahteve in preskusne metode - Dopolnilo A11

General Information

• Status: Published
• Public Enquiry End Date: 25-Jan-2024
• Publication Date: 01-Sep-2025
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• ICS: 29.240.10 - Substations. Surge arresters
• Technical Committee: POD - Surge aresters
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2025
• Due Date: 06-Nov-2025
• Completion Date: 02-Sep-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: EN IEC 61643-41:2025/A11:2025 - Low-voltage surge protective devices - Part 41: Surge protective devices connected to DC low-voltage power systems - Requirements and test methods

Relations

• Amends: SIST EN IEC 61643-41:2025 - Low-voltage surge protective devices - Part 41: Surge protective devices connected to DC low-voltage power systems - Requirements and test methods (IEC 61643-41:2025)
• Effective Date: 01-Oct-2025

Overview

SIST EN IEC 61643-41:2025/A11:2025 defines the requirements and test methods for low-voltage surge protective devices (SPDs) connected to DC low-voltage power systems. Developed by the Slovenski inštitut za standardizacijo (SIST), this standard is identical to the European Standard EN IEC 61643-41:2025/A11:2025, focusing on the safety, reliability, and performance of SPDs in direct current (DC) applications. As modern infrastructure increasingly relies on DC systems, ensuring robust surge protection is essential for protecting sensitive equipment and maintaining operational continuity.

Key Topics

• Scope and Implementation: This amendment applies to surge protective devices (SPDs) specifically designed for use in DC low-voltage power systems. It stipulates mandatory requirements and consistent test methods to ensure device conformity.
• Normative References: The standard references key international documents, primarily IEC 61643-01, addressing general requirements and specific test procedures for surge protection.
• Safety and Compliance: The amendment aligns with European legislation, specifically with the safety objectives outlined in Directive 2014/35/EU, the Low Voltage Directive (LVD). It describes how compliance with this standard leads to a presumption of conformity with the LVD safety requirements.
• Modification to the Scope: Previous exclusions based on risk assessments or national regulations have been updated, streamlining the requirements for SPDs in various DC applications.

Applications

• Renewable Energy Systems: With the growing use of photovoltaic (PV) and other renewable sources, SPDs are critical for protecting DC power systems from transient overvoltages resulting from lightning or grid fluctuations.
• Industrial Automation: Automated and process control systems increasingly use DC power supplies, requiring consistent surge protection to prevent costly downtime and equipment failure.
• Telecommunications: Protecting low-voltage DC supply systems in telecom infrastructure ensures service reliability and reduces maintenance caused by transient surges.
• E-Mobility and Transportation: Electric vehicle (EV) charging stations and railway applications that depend on DC circuits benefit from the targeted requirements and robust test methods established in this standard.
• Data Centers and IT Facilities: Uninterruptible power supplies (UPS) and modular data centers need approved and tested SPDs for DC lines, ensuring the protection of critical IT equipment.

Related Standards

For comprehensive surge protective measures and compliance, refer to the following related standards:

• IEC 61643-01: General requirements and test methods for low-voltage surge protective devices
• EN IEC 61643-21: Surge protective devices for low-voltage communication and signaling networks
• EN IEC 62305 Series: Lightning protection standards for structures and electrical systems
• EN 50539-11: Requirements for SPDs specifically for photovoltaic installations
• Directive 2014/35/EU (Low Voltage Directive): European legislation concerning the safety of electrical equipment within certain voltage limits

Practical Value

Implementing SIST EN IEC 61643-41:2025/A11:2025 ensures that surge protective devices in DC low-voltage systems meet the latest European and international requirements. This enhances safety, supports regulatory compliance, and helps manufacturers and system integrators mitigate risks associated with transient overvoltages. Stakeholders-including designers, installers, and facility operators-benefit by reducing downtime, securing sensitive equipment, and ensuring continuity of essential services across various industrial, commercial, and infrastructural applications.

Adhering to this standard is essential for organizations committed to best practices in surge protection and compliance with evolving electrical safety requirements.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2025
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 41. del: Naprave
za zaščito pred prenapetostnimi udari za nizkonapetostne DC napajalne sisteme -
Zahteve in preskusne metode - Dopolnilo A11
Low-voltage surge protective devices - Part 41: Surge protective devices connected to
DC low-voltage power systems - Requirements and test methods
Überspannungsschutzgeräte für Niederspannung - Teil 41: Überspannungsschutzgeräte
für den Einsatz in Niederspannungs-Gleichstromnetzen - Anforderungen und
Prüfverfahren
Parafoudres basse tension - Partie 41: Parafoudres connectés aux réseaux basse
tension en courant continu - Exigences et méthodes d’essai
Ta slovenski standard je istoveten z: EN IEC 61643-41:2025/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 61643-41:2025/A11

NORME EUROPÉENNE
EUROPÄISCHE NORM August 2025
ICS 29.240.10
English Version
Low-voltage surge protective devices - Part 41: Surge protective
devices connected to DC low-voltage power systems -
Requirements and test methods
Parafoudres basse tension - Partie 41: Parafoudres Überspannungsschutzgeräte für Niederspannung - Teil 41:
connectés aux réseaux basse tension en courant continu - Überspannungsschutzgeräte für den Einsatz in
Exigences et méthodes d'essai Niederspannungs-Gleichstromnetzen - Anforderungen und
Prüfverfahren
This amendment A11 modifies the European Standard EN IEC 61643-41:2025; it was approved by CENELEC on 2025-07-15. 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 61643-41:2025/A11:2025 E

Contents Page
European foreword . 3
1 Modification to the Scope . 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 61643-41:2025/A11:2025) has been prepared by CLC/TC 37A “Low voltage surge
protective devices”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2026-08-31
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2028-08-31
conflicting with this document have to be
withdrawn
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.
Clauses, subclauses, notes, tables, figures and annexes which are additional to those in IEC 61643-41:2025
are prefixed “Z”.
This document has been prepared under a standardization request addressed to CENELEC by the European
Commission. The Standin
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