SIST EN IEC 61643-11:2026
(Main)Low-voltage surge protective devices - Part 11: Surge protective devices connected to AC low-voltage power systems - Requirements and test methods (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 (IEC 61643-11:2025)
IEC 61643-11:2025 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 AC power circuits and equipment rated up to 1 000 V RMS, the preferred frequencies taken into account in this document are 50/60 Hz. Other frequencies are not excluded. Performance and safety requirements, tests and ratings are specified in this document. These devices contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents.
The test requirements provided by this document are based on the assumption that the SPD is connected to an AC power circuit fed by a power source providing a linear voltage-current characteristic. When the SPD is to be connected to a different kind of source or to a different frequency, careful consideration is required. This mainly applies with regard to system and fault conditions to be expected in such a system (e.g. expected short circuit current, TOV-stresses).
This document can apply for railway applications, when related product standards do not exist for that area or for certain applications.
Based on a risk assessment it might not be necessary to apply all requirements of this document to SPDs designed for specific power applications only, e.g. circuits with a low power capability, circuits supplied by nonlinear sources, circuits with protective separation from the utility supply.
NOTE 1 More information on risk assessment is provided in IEC Guide 116.
NOTE 2 Other exclusions based on national regulations are possible.
This edition includes the following significant technical changes with respect to the previous edition:
a) Specific requirements for SPDs for AC applications are now contained in this document, whereas the common requirements for all SPDs are now contained in IEC 61643-01;
b) Clarification on test application either to a complete SPD, to a "mode of protection", or to a complete "SPD assembly";
c) Additional measurement of voltage protection level on "combined modes of protection" between live conductors and PE;
d) Additional duty test for T1 and T2 SPDs with follow current to check variation of the follow current value at lower impulse currents;
e) Modified and amended short circuit current test requirements to better cover up to date internal SPD disconnector technologies;
f) Improved dielectric test requirements for the SPD's main circuits and added dielectric test requirements for "electrically separated circuits";
g) Additional clearance requirements for "electrically separated circuits".
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.
Überspannungsschutzgeräte für Niederspannung - Teil 11: Überspannungsschutzgeräte für den Einsatz in Niederspannungs-Wechselstromnetzen - Anforderungen und Prüfverfahren (IEC 61643-11:2025)
Parafoudres basse tension - Partie 11: Parafoudres connectés aux réseaux basse tension en courant alternatif - Exigences et méthodes d’essai (IEC 61643-11:2025)
IEC 61643-11:2025 s’applique aux dispositifs de protection contre les effets indirects et directs de la foudre ou contre les surtensions transitoires.
Ces dispositifs sont destinés à être connectés à des circuits d’alimentation ou équipements en courant alternatif de tension assignée allant jusqu’à 1 000 V efficaces. Les fréquences préférentielles prises en compte dans le présent document sont 50/60 Hz. Les autres fréquences ne sont toutefois pas exclues. Les exigences de performance et de sécurité, les essais et les valeurs assignées sont spécifiés dans le présent document. Ces dispositifs comportent au moins un composant non linéaire et sont utilisés pour limiter les surtensions et écouler les courants de foudre.
Les exigences d’essai prévues par le présent document reposent sur l’hypothèse que le parafoudre est connecté à un circuit d’alimentation en courant alternatif alimenté par une source d’alimentation présentant une caractéristique tension-courant linéaire. Lorsque le parafoudre doit être connecté à un autre type de source ou à une fréquence différente, une attention particulière est exigée, notamment s’agissant des conditions de réseau et des conditions de défaut qui peuvent être attendues dans un tel réseau (par exemple le courant de court-circuit prévu, les contraintes TOV).
Le présent document peut s’appliquer aux applications ferroviaires, lorsqu’il n’existe pas de normes de produits connexes pour ce domaine ou pour certaines applications.
Sur la base d’une évaluation des risques, il peut ne pas être nécessaire d’appliquer toutes les exigences du présent document aux parafoudres conçus uniquement pour des applications électriques spécifiques, par exemple les circuits ayant une faible capacité électrique, les circuits alimentés par des sources non linéaires, les circuits avec une séparation de protection de l’alimentation électrique.
NOTE 1 Des informations supplémentaires sur l’évaluation des risques sont données dans le Guide 116 de l’IEC.
NOTE 2 D’autres exclusions fondées sur des réglementations nationales sont possibles.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) ajout dans le présent document des exigences spécifiques aux parafoudres pour les applications en courant alternatif, et déplacement des exigences communes à tous les parafoudres dans l’IEC 61643-01;
b) clarification de l’application des essais soit à un parafoudre complet, soit à un "mode de protection", soit à un "ensemble parafoudre" complet;
c) ajout d’une mesure du niveau de protection en tension sur les "modes de protection combinés" entre les conducteurs actifs et le PE;
d) ajout d’un essai de fonctionnement pour les parafoudres T1 et T2 avec courant de suite pour vérifier la variation de la valeur du courant de suite à des courants de choc plus faibles;
e) modification des exigences relatives à l’essai de comportement vis-à-vis des courants de court-circuit afin de mieux couvrir les technologies modernes de déconnecteurs internes de parafoudre;
f) amélioration des exigences relatives à l’essai diélectrique pour les circuits principaux d’un parafoudre et ajout d’exigences relatives à l’essai diélectrique pour les "circuits électriquement séparés";
g) ajout d’exigences en matière de distance d’isolement pour les "circuits électriquement séparés".
Les exigences du présent document complètent, modifient ou remplacent certaines des exigences générales contenues dans l’IEC 61643-01. Elles doivent être lues et appliquées conjoint
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 11. del: Naprave za zaščito pred prenapetostnimi udari za nizkonapetostne napajalne sisteme AC - Zahteve in preskusne metode (IEC 61643-11:2025)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2026
Nadomešča:
SIST EN 61643-11:2012
SIST EN 61643-11:2012/A11:2018
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 11. del: Naprave
za zaščito pred prenapetostnimi udari za nizkonapetostne napajalne sisteme AC -
Zahteve in preskusne metode (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 (IEC 61643-11:2025)
Überspannungsschutzgeräte für Niederspannung - Teil 11: Überspannungsschutzgeräte
für den Einsatz in Niederspannungs-Wechselstromnetzen - Anforderungen und
Prüfverfahren (IEC 61643-11:2025)
Parafoudres basse tension - Partie 11: Parafoudres connectés aux réseaux basse
tension en courant alternatif - Exigences et méthodes d’essai (IEC 61643-11:2025)
Ta slovenski standard je istoveten z: EN IEC 61643-11:2025
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
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2025
ICS 29.240.10 Supersedes EN 61643-11:2012; EN 61643-
11:2012/A11:2018
English Version
Low-voltage surge protective devices - Part 11: Surge protective
devices connected to AC low-voltage power systems -
Requirements and test methods
(IEC 61643-11:2025)
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
(IEC 61643-11:2025) und Prüfverfahren
(IEC 61643-11:2025)
This European Standard was approved by CENELEC on 2025-07-23. 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.
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 E
European foreword
The text of document 37A/427/FDIS, future edition 2 of IEC 61643-11, 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 61643-11:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-11-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-11-30
document have to be withdrawn
This document supersedes EN 61643-11:2012 and all of its amendments and corrigenda (if any).
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 61643-11:2025/A11:2025.
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 61643-11:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60038:2009 NOTE Approved as EN 60038:2011
IEC 61643-11 ®
Edition 2.0 2025-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 connectés aux réseaux basse tension en courant
alternatif – Exigences et méthodes d’essai
ICS 29.240.10 ISBN 978-2-8327-0473-8
IEC 61643-11:2025-06(en-fr)
– 2 – IEC 61643-11:2025 © IEC 2025
CONTENTS
FOREWORD . 5
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 10
3.1 Terms and definitions . 10
4 Classification . 10
4.13 End-of-life mode of the SPDA . 10
4.100 Power system. 10
4.100.1 AC between 47 Hz and 63 Hz . 10
4.100.2 AC other than the range of 47 Hz to 63 Hz . 10
5 Void . 10
6 Marking and other product information . 10
6.2 List of items . 10
6.2.100 Markings which are required on the body, or permanently attached to the
body, of the SPD . 11
6.2.100.1 Markings which shall be visible after installation. 11
6.2.100.2 Markings which are not required to be visible after installation . 11
6.2.101 Information to be provided by the manufacturer . 11
6.2.102 Information which shall be provided by the manufacturer for type testing, as
applicable . 11
7 Service conditions . 11
7.100 Frequency. 11
8 Requirements . 11
8.3 Electrical requirements . 11
8.3.6.4 Dedicated overstress behaviour . 11
8.3.9 Behaviour under temporary overvoltages . 12
8.3.9.100 TOVs caused by faults or disturbances in the low voltage system . 12
8.3.9.101 TOVs caused by faults in the high (medium) voltage system . 12
8.5 Environmental and material requirements . 12
8.5.5 Ageing behaviour under damp heat . 12
8.6.100 Portable SPDs defined as pluggable equipment type A . 12
9 Tests . 12
9.1 Type testing procedures . 12
9.1.1 General. 12
9.3 Electrical tests . 17
9.3.3 Protective conductor current I . 17
PE
9.3.3.1 Test procedure . 17
9.3.5 Operating duty test . 17
9.3.5.2 Power source characteristics for the operating duty test . 17
9.3.5.2.1 General . 17
9.3.5.2.3 SPD's modes of protection with follow current according to Annex B of
IEC 61643-01 . 17
9.3.6 Safety performance of overstressed SPDs . 17
9.3.6.2 Thermal protection test . 17
9.3.6.2.2 Test settings . 17
IEC 61643-11:2025 © IEC 2025 – 3 –
9.3.6.3 Short-circuit current behaviour test . 18
9.3.6.3.3 Test at the declared short-circuit current rating . 18
9.3.6.3.4 Test at low short-circuit current . 18
9.3.6.4 Dedicated overstress test . 19
9.3.6.4.100 Sample preparation . 19
9.3.6.4.101 Test procedure . 19
9.3.6.4.102 Pass criteria . 21
9.3.9 Behaviour under temporary overvoltages (TOVs) . 21
9.3.9.100 TOVs caused by faults in the low voltage system . 21
9.3.9.100.1 General . 21
9.3.9.100.2 Test procedure . 21
9.3.9.100.3 Pass criteria . 23
9.3.9.101 TOVs caused by faults in the high (medium) voltage system . 23
9.3.9.101.1 General . 23
9.3.9.101.2 Test procedure . 23
9.3.9.101.3 Pass criteria . 25
9.5 Environmental and material tests. 25
9.5.5 Life test under damp heat . 25
Annex AA (normative) Application of annexes from IEC 61643-01 . 26
Annex BB (normative) Test voltages for SPDs – U . 27
test
Annex CC (normative) TOV Ratings . 33
CC.1 Overview . 33
CC.2 TOV ratings based on IEC 60364-4-44:2024, Clause 442. 33
CC.3 Other TOV ratings for specific distribution systems or countries. 34
CC.3.1 General. 34
CC.3.2 North American systems . 34
CC.3.3 Japanese systems . 35
Annex DD (normative) Reduced test procedures . 36
Annex EE (normative) Portable SPDs defined as pluggable equipment type A . 38
EE.1 General . 38
EE.2 Additional requirements . 38
EE.3 Modified test requirements. 39
EE.3.1 Test at low short-circuit current . 39
EE.3.2 Ded
...
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