SIST EN IEC 60034-11:2025
(Main)Rotating electrical machines - Part 11: Thermal protection (IEC 60034-11:2020)
Rotating electrical machines - Part 11: Thermal protection (IEC 60034-11:2020)
This part of IEC 60034 specifies requirements relating to the use of thermal protectors and
thermal detectors incorporated into the stator windings or placed in other suitable positions in
induction machines in order to protect them against serious damage due to thermal overloads.
It applies to single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with
IEC 60034-1 and IEC 60034-12 that:
• have a rated voltage up to 1 000 V;
• are intended for direct-on-line or star-delta starting.
Not included are:
• direct protection of the rotor winding; the methods of protection only protect rotor windings
indirectly; for large motors (particularly 2 pole motors) and for motors starting large inertia
loads, special attention is given to rotor heating both when starting and especially after a
"trip" has occurred;
• the protection of bearings and other mechanical parts;
• the protection methods to be used for particular applications.
NOTE 1 Although temperature values given in this document are higher than those specified in IEC 60034-1, they
are not in conflict.
NOTE 2 Additional requirements may apply to particular motor types, such as those used in household appliances,
or for motors used in explosive atmospheres
Drehende elektrische Maschinen - Teil 11: Thermischer Schutz (IEC 60034-11:2020)
Machines électriques tournantes - Partie 11: Protection thermique (IEC 60034-11:2020)
IEC 60034-11:2020 est disponible sous forme de IEC 60034-11:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60034-11:2020 spécifie les exigences relatives à l’utilisation de protecteurs et détecteurs thermiques incorporés dans les enroulements statoriques, ou autres emplacements adaptés, dans les machines à induction afin de les protéger contre de graves dommages dus aux surcharges thermiques. Elle s’applique aux moteurs triphasés à induction à cage à une seule vitesse fonctionnant à 50 Hz ou 60 Hz conformément à l’IEC 60034-1 et à l’IEC 60034-12 qui:
- ont une tension assignée jusqu’à 1 000 V;
- sont prévus pour un démarrage direct ou étoile-triangle.
Par rapport à l’édition précédente, les modifications majeures sont les suivantes
- spécification supplémentaire relative aux limites de température de l’enroulement pour la classe thermique 200 (N),
- augmentation des limites des températures maximales d’enroulement pour surcharges à évolution rapide,
- précision concernant l’enroulement du moteur qui peut être endommagé de façon permanente après une exposition aux températures,
- précision de la définition de protection thermique indirecte,
- précision, au 8.3, concernant les méthodes d’essai pour les moteurs plus importants.
Električni rotacijski stroji - 11. del: Termična zaščita (IEC 60034-11:2020)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Električni rotacijski stroji - 11. del: Termična zaščita (IEC 60034-11:2020)
Rotating electrical machines - Part 11: Thermal protection (IEC 60034-11:2020)
Drehende elektrische Maschinen - Teil 11: Thermischer Schutz (IEC 60034-11:2020)
Machines électriques tournantes - Partie 11: Protection thermique (IEC 60034-11:2020)
Ta slovenski standard je istoveten z: EN IEC 60034-11:2024
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60034-11
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2024
ICS 29.160.01 Supersedes EN 60034-11:2004
English Version
Rotating electrical machines - Part 11: Thermal protection
(IEC 60034-11:2020)
Machines électriques tournantes - Partie 11: Protection Drehende elektrische Maschinen - Teil 11: Thermischer
thermique Schutz
(IEC 60034-11:2020) (IEC 60034-11:2020)
This European Standard was approved by CENELEC on 2024-09-25. 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60034-11:2024 E
European foreword
The text of document 2/2011/FDIS, future edition 3 of IEC 60034-11, prepared by TC 2 "Rotating
machinery" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-11-30
level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-11-30
document have to be withdrawn
This document supersedes EN 60034-11:2004 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.
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 60034-11:2020 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60034-1 2017 Rotating electrical machines - Part 1: - -
Rating and performance
IEC 60034-12 2016 Rotating electrical machines - Part 12: EN 60034-12 2017
Starting performance of single-speed
three-phase cage induction motors
IEC 60034-11 ®
Edition 3.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 11: Thermal protection
Machines électriques tournantes –
Partie 11: Protection thermique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-8844-3
– 2 – IEC 60034-11:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Thermal protection limits . 7
5 Protection against thermal overloads with slow variation . 8
6 Protection against thermal overloads with rapid variation . 9
7 Restart after tripping . 11
8 Type tests . 12
8.1 General . 12
8.2 Verification of temperature due to the thermal overloads with slow variation . 12
8.3 Verification of temperature due to thermal overloads with rapid variation . 12
9 Routine tests . 12
Figure 1 – Example of thermal overload with slow variation and direct thermal
protection . 8
Figure 2 – Example of thermal overload with slow variation in the case of too intensive
intermittent periodic duty with starting (duty S4) and direct thermal protection . 9
Figure 3 – Example of thermal overload with rapid variation where the thermally critical
part has direct thermal protection . 10
Figure 4 – Example of thermal overload with rapid variation where the thermally critical
part has indirect thermal protection . 11
Table 1 – Maximum winding temperatures for overloads with slow variation . 8
Table 2 – Maximum winding temperatures for overloads with rapid variation . 9
IEC 60034-11:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 11: Thermal protection
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60034-11 has been prepared by IEC technical committee 2: Rotating
machinery.
This third edition cancels and replaces the second edition, published in 2004. This edition
constitutes a technical revision.
The main changes with respect to the previous edition are
– the additional specification of winding temperature limits for temperature class 200 (N),
– the increased limits of maximum winding temperatures for overloads with rapid variation,
– the clarification that the motor winding may be permanently damaged after it has been
exposed to temperatures according to Table 2,
– a clarification of scope,
– a clarification of the definition of indirect thermal protection,
– a clarifying note in Clause 6,
– the conversion of note 3 in Clause 6 into normal text including changes in wording,
– 4 – IEC 60034-11:2020 © IEC 2020
– the incorporation of note 3 in Clause 5 into Clause 2,
– a clarification on the test methods for larger motors in 8.3.
The text of this International Standard is based on the following documents:
FDIS Report on voting
2/2011/FDIS 2/2019/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60034 series, published under the general title Rotating electrical
machines, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IEC 60034-11:2020 © IEC 2020 – 5 –
INTRODUCTION
Thermal protection systems are based on the principle of protecting or monitoring the vulnerable
machine parts against excessive temperatures. This requires the selection of the appropriate
thermal protection device to suit both the type of protection required and the machine
component to be protected. This document does not detail the protection methods available or
specify the protection method to be
...
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