SIST EN IEC 61643-41:2025

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 (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)
Überspannungsschutzgeräte für Niederspannung – Teil 41: Überspannungsschutzgeräte
für den Einsatz in Niederspannungs-Gleichstromnetzen - Anforderungen und
Prüfverfahren (IEC 61643-41:2025)
Parafoudres basse tension - Partie 41: Parafoudres connectés aux réseaux basse
tension en courant continu - Exigences et méthodes d’essai (IEC 61643-41:2025)
Ta slovenski standard je istoveten z: EN IEC 61643-41:2025
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

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
(IEC 61643-41:2025)
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
(IEC 61643-41:2025) Prüfverfahren
(IEC 61643-41:2025)
This European Standard 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 European Standard 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 European Standard 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.
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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 E

European foreword
The text of document 37A/426/FDIS, future edition 1 of IEC 61643-41, prepared by SC 37A "Low-
voltage surge protective devices" of IEC/TC 37 "Surge arresters" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 61643-41:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-08-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-08-31
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.
This document is read in conjunction with EN IEC 61643-01.
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
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61643-41:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 62368-1:2018 NOTE Approved as EN IEC 62368-1:2020 (not modified) + A11:2020
ISO 4892-1 NOTE Approved as EN ISO 4892-1
ISO 4892-2 NOTE Approved as EN ISO 4892-2
IEC 61643-41 ®
Edition 1.0 2025-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 connectés aux réseaux basse tension en courant continu –
Exigences et méthodes d’essai
ICS 29.240.10  ISBN 978-2-8327-0447-9

IEC 61643-41:2025-05(en-fr)
– 2 – IEC 61643-41:2025 © IEC 2025
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 7
4 Classification . 7
5 Void . 7
6 Marking and other product information . 7
7 Service conditions . 8
8 Requirements . 8
9 Tests . 9
Annex AA (normative) Application of annexes from IEC 61643-01 . 20
Annex BB (normative) Test voltages for SPDs – U . 21
test
Annex CC (normative) TOV test values for DC power systems . 23
Annex DD (informative) DC power systems . 25
Bibliography . 31

Figure 100 – Procedure for sample preparation for dedicated overstress test . 16
Figure 101 – Example of a test circuit for the TOV tests . 18
Figure 102 – Timing diagram for the TOV tests . 18
Figure DD.1 – TT DC distribution system . 25
Figure DD.2 – TT DC distribution system with a mid-point. 26
Figure DD.3 – TN-S DC distribution system . 26
Figure DD.4 – TN-S DC distribution system with a mid-point . 27
Figure DD.5 – TN-C DC distribution system with a mid-point . 27
Figure DD.6 – TN-C DC distribution system. 28
Figure DD.7 – TN-C-S DC distribution system . 28
Figure DD.8 – TN-C-S DC distribution system with a mid-point . 29
Figure DD.9 – IT DC distribution system . 29
Figure DD.10 – IT DC distribution system with a mid-point . 30

Table 100 – Type test requirements for SPDs . 10
Table 101 – Prospective short circuit current and time constant . 14
Table AA.1 – Application of annexes from IEC 61643-01 . 20
Table BB.1 – Test voltage values . 22
Table CC.1 – TOV test values for DC power systems . 23
Table CC.2 – Prospective short-circuit currents for TOV tests . 24

IEC 61643-41:2025 © IEC 2025 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SURGE PROTECTIVE DEVICES –

Part 41: Surge protective devices connected to DC low-voltage power
systems – Requirements and test methods

FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61643-41 has been prepared by subcommittee 37A: Low-voltage surge protective devices,
of IEC technical committee 37: Surge arresters. It is an International Standard.
This first edition only contains the specific requirements for SPDs for DC applications.
This International Standard is to be used in conjunction with IEC 61643-01.
The requirements of this document supplement, modify or replace certain of the general
requirements contained in IEC 61643-01 and shall be read and applied together with the latest
edition of IEC 61643-01, as indicated by the undated normative reference in Clause 2 of this
document.
Numbering of clauses follows the numbering of IEC 61643-01, but, dependent on the application
of clauses from IEC 61643-01, does not necessarily follow sequentially.

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