EN IEC 61643-11:2025

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 Dedicated overstress test . 39
EE.3.3 Behaviour under temporary overvoltages (TOVs) . 39
Bibliography . 41

Figure 100 – Test circuit for the dedicated overstress test . 20
Figure 101 – Timing diagram for the dedicated overstress test . 20
Figure 102 – Example of a test circuit to perform the test under TOVs caused by faults
in the low voltage system . 22
Figure 103 – Timing diagram for the test under TOVs caused by faults in the low
voltage system . 23
Figure 104 – Example of a test setup for testing SPDs for use in TT systems under
TOVs caused by faults in high (medium) voltage systems . 24
Figure 105 – Timing diagram for use in testing SPDs under TOVs caused by faults in
the high (medium) voltage system using the circuit of Figure 104 . 25
Table 100 – Type test requirements for SPDs . 14

– 4 – IEC 61643-11:2025 © IEC 2025
Table 101 – Prospective short-circuit current and power factor . 18
Table AA.1 – Application of annexes from IEC 61643-01 . 26
Table BB.1 – Test voltage values . 28
Table BB.2 – Test voltage values for Japanese systems . 32
Table CC.1 – TOV test values for systems complying with IEC 60364 series . 34
Table CC.2 – TOV test parameters for North American systems . 35
Table CC.3 – TOV test parameters for Japanese systems . 35
Table DD.1 – Reduced test procedure for SPDs complying with IEC 61643-11:2011 . 36
Table EE.1 – TOV test values for systems complying with IEC 60364 series for
portable SPDs . 40
Table EE.2 – TOV test parameters for Japanese systems . 40

IEC 61643-11:2025 © IEC 2025 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SURGE PROTECTIVE DEVICES –

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

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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
may be required to implement this document. However, implementers are cautioned that this may not represent
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 61643-11 has been prepared by subcommittee 37A: Low-voltage surge protective devices,
of IEC technical committee 37: Surge arresters. It is an International Standard.
This second edition cancels and replaces the first edition published in 2011. This edition
constitutes a technical revision.
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";
– 6 – IEC 61643-11:2025 © IEC 2025
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.
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.
If a clause in IEC 61643-01 is not explicitly called up or referred to in this document, then this
clause does not apply to SPDs covered by this document. Any instructions in this document
calling up clauses from IEC 61643-01 are written in Italic type.
NOTE In other words, if e.g. Clause 4 is called up in this document all subclauses of Clause 4 of IEC 61643-01 are
applied without modification. But, if e.g. some modifications are required on subclauses of Clause 9 of IEC 61643-
01, then the relevant second level subclauses of IEC 61643-01 (e.g. 9.3, 9.5 etc.) are called up separately and it is
indicated how they are applied.
The numbering of additional subclauses to IEC 61643-01 in this document starts with the
number 100 in the last section of the subclause added (see e.g. 4.100). The numbering of
additional tables and figures to IEC 61643-01 in this document starts with the number 100.
The text of this International Standard is based on the following documents:
Draft Report on voting
37A/427/FDIS 37A/431/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 61643 series, published under the general title Low-voltage surge
protective devices, can be found on the IEC website.

IEC 61643-11:2025 © IEC 2025 – 7 –
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
– 8 – IEC 61643-11:2025 © IEC 2025
INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
This document recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of SPDs when operated as in normal use
taking into account the manufacturer's instructions. It also covers abnormal situations that can
be expected in practice.
This document takes into account the requirements of IEC 60364 as far as possible so that
there is compatibility with the wiring rules when the SPD is connected to the supply mains.
However, national wiring rules might differ.
If the intended applications of an SPD are covered by different parts of the IEC 61643-X1 series,
all relevant parts are applied, as far as is reasonable.
This document addresses safety and performance tests for surge protective devices (SPDs) for
AC applications in conjunction with IEC 61643-01.
This document addresses T1 SPD, T2 SPD and T3 SPD according to IEC 61643-01.
IEC 61643-12 addresses the selection and application principles of SPDs.

IEC 61643-11:2025 © IEC 2025 – 9 –
LOW-VOLTAGE SURGE PROTECTIVE DEVICES –

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

1 Scope
This document, together with IEC 61643-01, 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.
2 Normative references
For the purposes of this document the normative references given in IEC 61643-01 with the
following additions apply.
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60364-4-44:2024, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60947-1:2020, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 61643-01, Low-voltage surge protective devices – Part 01: General requirements and test
methods
– 10 – IEC 61643-11:2025 © IEC 2025
3 Terms, definitions and abbreviated terms
Clause 3 of IEC 61643-01 applies with the following addition:
3.1 Terms and definitions
Subclause 3.1 of IEC 61643-01 applies with the following addition:
3.1.100
pluggable equipment type A
equipment that is intended for connection to the mains via a non-industrial plug and socket-
outlet or via a non-industrial appliance coupler, or both, and is dedicated to household and
similar uses
Note 1 to entry: For non-industrial plug and socket-outlets, see IEC TR 60083 or a national equivalent. For non-
industrial appliance couplers, see IEC 60320-1.
[SOURCE: IEC 60050-903:2013+AMD1:2014+AMD2:2015, 151-16-40, modified – addition of
"and is dedicated to household and similar uses"]
4 Classification
Clause 4 of IEC 61643-01 applies with the following additions:
4.13 End-of-life mode of the SPDA
Subclause 4.13 of IEC 61643-01 applies with the following additions:
For SPDAs for AC power circuits fed by a power source providing a linear voltage-current
characteristic, only the open circuit mode according to 4.13.1 of IEC 61643-01 is applicable.
NOTE A short circuiting SPD, when used with its required SPD disconnectors (SPDA), fulfils the conditions to be
classified open circuit mode (OCM).
4.100 Power system
4.100.1 AC between 47 Hz and 63 Hz
4.100.2 AC other than the range of 47 Hz to 63 Hz
This may require additional and/or modified test procedures.
5 Void
6 Marking and other product information
Clause 6 of IEC 61643-01 applies with the following additions.
6.2 List of items
Subclause 6.2 of IEC 61643-01 applies with the following additions:
The following information from the list of items in 6.2 of IEC 61643-01 and any additional items
specified shall be provided as required below.
100) prospective short-circuit current for conditioning according to 9.3.6.4.101

IEC 61643-11:2025 © IEC 2025 – 11 –
6.2.100 Markings which are required on the body, or permanently attached to the body,
of the SPD
6.2.100.1 Markings which shall be visible after installation
Items 1) to 3) from 6.2 of IEC 61643-01 shall be visible after installation.
For portable SPDs and for pluggable SPDs it is sufficient that above markings are visible in the
unplugged condition. This does not apply to the minimum marking requirements according to
6.1 of IEC 61643-01.
6.2.100.2 Markings which are not required to be visible after installation
Items 4) to 8) from 6.2 of IEC 61643-01 shall be visible on the SPD but are not required to be
visible after installation.
6.2.101 Information to be provided by the manufacturer
Items 1) to 40) from 6.2 of IEC 61643-01 shall be provided, if applicable.
6.2.102 Information which shall be provided by the manufacturer for type testing, as
applicable
Items 41) to 43) from 6.2 of IEC 61643-01 and item 100) from 6.2 of this document shall be
provided.
7 Service conditions
Clause 7 of IEC 61643-01 applies with the following addition:
7.100 Frequency
The standard frequency range is from 47 Hz to 63 Hz AC.
Other frequencies may require additional and/or modified test procedures.
8 Requirements
Clause 8 of IEC 61643-01 applies with the following additions and exemptions:
8.3 Electrical requirements
Subclause 8.3 of IEC 61643-01 applies with the following additions and exemption:
8.3.6.4 Dedicated overstress behaviour
Subclause 8.3.6.4 of IEC 61643-01 applies with the following exemption:
This test is not performed on SPD’s modes of protection classified according to 4.14.1.4 of
IEC 61643-01.
– 12 – IEC 61643-11:2025 © IEC 2025
8.3.9 Behaviour under temporary overvoltages
Subclause 8.3.9 of IEC 61643-01 applies with the following additions:
SPDs shall either withstand the overvoltages caused by faults or disturbances in the high or
low voltage system or fail in a manner not creating a hazard.
NOTE This covers the requirements for fault protection from 534.4.6 of IEC 60364-5-53:2019+AMD1:2020.
8.3.9.100 TOVs caused by faults or disturbances in the low voltage system
Compliance is checked by the test in accordance with 9.3.9.100.
8.3.9.101 TOVs caused by faults in the high (medium) voltage system
Compliance is checked by the test in accordance with 9.3.9.101.
SPDs, for which the manufacturer declares in the installation instructions that they may be
installed in TT-systems between neutral and PE upstream of the main RCD, shall pass this test
in withstand mode according to 9.3.9.101.2, b).
8.5 Environmental and material requirements
Subclause 8.5 of IEC 61643-01 applies with the following exemption:
8.5.5 Ageing behaviour under damp heat
Subclause 8.5.5 of IEC 61643-01 does not apply.
8.6.100 Portable SPDs defined as pluggable equipment type A
For portable SPDs defined as pluggable equipment Type A, the additional requirements and
modified test requirements according to Annex EE apply.
9 Tests
Clause 9 of IEC 61643-01 applies with the following additions:
9.1 Type testing procedures
Subclause 9.1 of IEC 61643-01 applies with the following additions:
9.1.1 General
Subclause 9.1.1 of IEC 61643-01 applies with the following additions:
The test voltage U shall be selected from Annex BB based on the information given by the
test
manufacturer according to 6.2.101 and according to items 9), 10), 20) and 21) from 6.2 of
IEC 61643-01.
The test frequency shall be (50 Hz or 60 Hz) ± 3 Hz unless otherwise specified.
For SPDs with a designated N terminal/connection, which may be applied in systems without
distributed neutral according to the manufacturer's instructions, separate testing is required for
the L-PE mode of protection with the neutral being unconnected.
Table 100 shows all tests and for which tests the tissue paper and/or the metallic screen are
required.
IEC 61643-11:2025 © IEC 2025 – 13 –
Annex AA provides information which Annexes from IEC 61643-01 apply to SPDs for AC low-
voltage power systems.
For products already compliant with IEC 61643-11:2011 the reduced test procedure according
to Annex DD may be applied.
– 14 – IEC 61643-11:2025 © IEC 2025
Table 100 – Type test requirements for SPDs
SPD assembly SPD
SPD design
External
classified
Require- Tissue Metallic
SPD
outdoor
dis-
T1 T2 T3
Test Test clause ment paper screen
and
connec- SPD SPD SPD
e)
voltage combi- voltage N-PE
clause used used
a) inacces-
OCM SCM
tors
limiting nation switching
f)
sible
Marking and product
9.2 6 / 8.2 - - - M M M M M M M M M M
information
Protection against direct
9.3.1 8.3.1 - - - M M M M M M M M M M
contact
Continuous current 9.3.2 8.3.2 - - - M M M M M M M M M M
Protective conductor current 9.3.3 8.3.3 - - - A A A A A A A A A A
Measured limiting voltage 9.3.4 8.3.4 - - - M M M M M M M M M M
Residual voltage 9.3.4.2 - - - M M - M M M M M M M
Front-of-wave sparkover
9.3.4.3 - - - A A - A A - A A A A
voltage
Limiting voltage with the
9.3.4.4 - - - - - M M M M M M M M
combination wave
b) g) c)
Operating duty 8.3.5 - - M M M M M M M M M M
9.3.5 A
T1 SPD and T2 SPD
c)
9.3.5.3 - - M M - M M M M M M M
A
operating duty
Additional duty test for
c)
9.3.5.4 - - M - - M M M M M M M
A
T1 SPD
Additional test for T1 SPD
c)
and T2 SPD with follow
9.3.5.5 A - - M M - M M - M M M M
current
c)
T3 SPD operating duty 9.3.5.6 - - - - M M M M M M M M
A
Temperature withstand 9.3.6.1 8.5.2 - - - M M M M M M M M M M
d)
Thermal protection 8.3.6.2 A - - M M M M M M M - A M
9.3.6.2
d)
Short-circuit current behaviour 8.3.6.3 A - M M M M M - M M M - -
9.3.6.3
d)
Dedicated overstress test 8.3.6.4 A - M M M M M - M M M - -
9.3.6.4
IEC 61643-11:2025 © IEC 2025 – 15 –
SPD assembly SPD
SPD design
External
classified
Require- Tissue Metallic
SPD
outdoor
dis-
T1 T2 T3
Test Test clause ment paper screen
and
connec-
SPD SPD SPD e)
voltage combi- voltage N-PE
clause used used
a)
inacces-
OCM SCM
tors
limiting nation switching
f)
sible
Insulation resistance 9.3.7 8.3.7 - - - M M M M M M M M M M
Dielectric withstand 9.3.8 8.3.8 - - - M M M M M M M M M M
Behavior under temporary
9.3.9 8.3.9 A M - A A A A - A A A - A
overvoltages (TOVs)
b)
5 s LV-TOV 9.3.9.100 8.3.9 A M - A A A A - A A A - A
b)
120 min LV-TOV 9.3.9.100 8.3.9 A M - A A A A - A A A - A
b)
HV-TOV 8.3.9 A M - A A A A - A A A A A
9.3.9.101
Reliability of screws, current- 8.4.1 /
9.4.2 - - - M M M M M M M M M M
carrying parts and connections 8.4.2
External connections 9.4.3 8.4.3 - - - M M M M M M M M M M
Air clearances and creepage
9.4.4 8.4.4 - - - M M M M M M M M M M
distances
Mechanical strength 9.4.5 8.4.5 - - - M M M M M M M M M M
IP code 9.5.1 8.5.1 - - - M M M M M M M M M M
Heat test 9.5.2.1 8.5.2 - - - M M M M M M M M M M
Ball pressure test 9.5.2.2 8.5.2 - - - A A A A A A A A A A
Resistance to abnormal heat
9.5.3 8.5.3 - - - A A A A A A A A A A
and fire
Tracking resistance 9.5.4 8.5.4 - - - A A A A A A A A A A
Additional tests for SPDs with active electronic circuits
Electromagnetic compatibility 8.5.6 - - - A A A A A A A A A A
Additional tests for two-port SPDs and one port-SPDs with separate input / output connections
Rated load current 9.6.1.1 8.6.1.1 A - - A A A A A A A A A A
b) d)
Overload behaviour 8.6.1.2 - - - A A A A - A A A A A
9.6.1.2
Load side short-circuit current
b)
9.6.1.3 8.6.1.3 A - M A A A A A A A A A A
behaviour
– 16 – IEC 61643-11:2025 © IEC 2025
SPD assembly SPD
SPD design
External
classified
Require- Tissue Metallic
SPD
outdoor
dis-
T1 T2 T3
Test Test clause ment paper screen
and
connec-
SPD SPD SPD e)
voltage combi- voltage N-PE
clause used used
a)
inacces-
OCM SCM
tors
limiting nation switching
f)
sible
Additional tests for SPDs for outdoor use
9.6.2 / Annex
Environmental tests for
D of 8.6.2 - - - A A A A A A A A A A
outdoor SPDs
IEC 61643-01
Additional tests for SPDs with separate isolated circuits
SPDs with separated circuits 9.6.3 8.6.3 - - - A A A A A A A A A A
Additional tests for short-circuiting SPDs
Annex E of
Transition surge current rating A - - O O - O O O O O O O
IEC 61643-01
Additional tests for specific SPD designs
b)
Total discharge current 8.6.4 - - - O O - O O O O O O O
9.6.4
Voltage drop 9.6.5.1 8.6.5.1 - - - O O O O O O O O O O
b) d) c)
Load-side surge withstand 8.6.5.2 - - O O O O O O O O O O
9.6.5.2 A
Voltage rate of rise du/dt 9.6.5.3 8.6.5.3 - - - O O O O O O O O O O
Portable SPDs classified as
Annex E 8.6.100 - - - A A A A A A A A - -
pluggable equipment type A
M = Mandatory test
A = Mandatory test, if applicable
- = not applicable
O = Additional test, if a value is declared by the manufacturer
a)
External disconnectors means that all disconnectors as specified by the manufacturer shall be tested with the SPD during the type test.
b)
For these tests initial measurements of leakage current according to Table 3 of IEC 61643-01 are required, when criterion E is required after the test.
c)
When RCDs are specified as external disconnectors by the manufacturer and the current impulse withstand for these RCDs, as specified by the relevant RCD standard, is lower
than the surge current applied during that type test, then they are not tested with the SPD during this type test.
d)
For this test more than one set of samples may be needed.
e)
SPDs for connection N-PE in TN and/or TT systems only.
f)
SPDs classified outdoor and inaccessible.
g)
For this test more than one set of samples may be needed, if the SPD is classified according to more than one type (see 4.5 of IEC 61643-01).

IEC 61643-11:2025 © IEC 2025 – 17 –
Pass criterion E from Table 3 of IEC 61643-01 applies with the following addition:
In case of resettable or rearmable disconnectors the dielectric withstand shall be checked by
application of two times U or 1 000 V AC, whichever is greater.
C
9.3 Electrical tests
Subclause 9.3 of IEC 61643-01 applies with the following additions:
9.3.3 Protective conductor current I
PE
Subclause 9.3.3 of IEC 61643-01 applies with the following additions:
9.3.3.1 Test procedure
Subclause 9.3.3.1 of IEC 61643-01 applies with the following additions:
The SPD assembly, but without any external disconnectors, shall be connected to an AC power
source as for normal use at the test voltage U .
test
9.3.5 Operating duty test
Subclause 9.3.5 of IEC 61643-01 applies with the following additions:
9.3.5.2 Power source characteristics for the operating duty test
Subclause 9.3.5.2 of IEC 61643-01 applies with the following additions:
9.3.5.2.1 General
Subclause 9.3.5.2.1 of IEC 61643-01 applies with the following addition:
The mode of protection under test shall be connected to a power frequency voltage source.
9.3.5.2.3 SPD's modes of protection with follow current according to Annex B of
IEC 61643-01
Subclause 9.3.5.2.3 of IEC 61643-01 applies with the following addition:
The power source shall have a power factor according to Table 101.
9.3.6 Safety performance of overstressed SPDs
Subclause 9.3.6 of IEC 61643-01 applies with the following additions:
9.3.6.2 Thermal protection test
Subclause 9.3.6.2 of IEC 61643-01 applies with the following additions:
9.3.6.2.2 Test settings
Subclause 9.3.6.2.2 of IEC 61643-01 applies with the following addition:
Test(s) according to procedure(s) a) and b) shall be performed using an AC power source.

– 18 – IEC 61643-11:2025 © IEC 2025
Subclause 9.3.6.2.2 of IEC 61643-01, testing procedure b2) applies with the following addition:
If the sample constructions allows, the test should be performed with DC.
9.3.6.3 Short-circuit current behaviour test
Subclause 9.3.6.3 of IEC 61643-01 applies with the following additions:
9.3.6.3.3 Test at the declared short-circuit current rating
Subclause 9.3.6.3.3 IEC 61643-01 applies with the following additions:
The test sample shall be connected to a power frequency source at U according to 9.1.1.
test
The prospective short circuit current shall be adjusted to I as declared by the manufacturer
SCCR
according to item 17) from 6.2 of IEC 61643-01 with a power factor according to Table 101.
Table 101 – Prospective short-circuit current and power factor
+5 0
I (kA) / % cos ϕ /
p 0 -0,05
I ≤ 1,5 0,95
P
1,5 < I ≤ 3,0 0,9
P
3,0 < I ≤ 4,5 0,8
P
4,5 < I ≤ 6,0 0,7
P
6,0 < I ≤ 10,0 0,5
P
10,0 < I ≤ 20,0 0,3
P
20,0 < I ≤ 50,0 0,25
P
...