IEC 60947-2:2006

Low-voltage switchgear and controlgear - Part 2: Circuit-breakers

This standard applies to circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.; it also contains additional requirements for integrally fused circuit-breakers. It applies whatever the rated currents, the method of construction or the proposed applications of the circuit-breakers may be.

Appareillage à basse tension - Partie 2: Disjoncteurs

La présente norme est applicable aux disjoncteurs dont les contacts principaux sont destinés à être reliés à des circuits dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu; elle contient aussi des prescriptions supplémentaires pour les disjoncteurs à fusibles incorporés. Elle est applicable quels que soient les courants assignés, les méthodes de construction et l'emploi prévu des disjoncteurs

General Information

• Status: Published
• Publication Date: 21-May-2006
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Drafting Committee: MT 9 - TC 121/SC 121A/MT 9
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 07-Jun-2016

Relations

• Amended By: IEC 60947-2:2006/AMD2:2013 - Amendment 2 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
• Effective Date: 05-Sep-2023
• Amended By: IEC 60947-2:2006/AMD1:2009 - Amendment 1 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
• Effective Date: 05-Sep-2023
• Revises: IEC 60947-2:2003 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
• Effective Date: 05-Sep-2023
• Revised: IEC 60947-2:2016 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60947-2
Edition 4.0 2006-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

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IEC 60947-2
Edition 4.0 2006-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XH
ICS 29.130.20 ISBN 2-8318-8649-X

60947-2  IEC:2006 – 3 – – 2 – 60947-2 © IEC:2006
CONTENTS
FOREWORD.7

1 General .9
1.1 Scope and object.9
1.2 Normative references .10
2 Definitions .12
3 Classification .15
4 Characteristics of circuit-breakers.16
4.1 Summary of characteristics.16
4.2 Type of circuit-breaker.17
4.3 Rated and limiting values of the main circuit.17
4.4 Utilization categories .21
4.5 Control circuits .21
4.6 Auxiliary circuits .22
4.7 Releases .22
4.8 Integral fuses (integrally fused circuit-breakers) .23
5 Product information.23
5.1 Nature of the information .23
5.2 Marking .24
5.3 Instructions for installation, operation and maintenance.25
6 Normal service, mounting and transport conditions.25
7 Constructional and performance requirements .25
7.1 Constructional requirements .25
7.2 Performance requirements.27
7.3 Electromagnetic compatibility (EMC) .33
8 Tests .33
8.1 Kind of tests .33
8.2 Compliance with constructional requirements.34
8.3 Type tests .34
8.4 Routine tests .6 1

Annex A (normative)  Co-ordination under short-circuit conditions between a circuit-
breaker and another short-circuit protective device associated in the same circuit.66
Annex B (normative)  Circuit-breakers incorporating residual current protection .75
Annex C (normative)  Individual pole short-circuit test sequence.107
Annex D Vacant .108
Annex E (informative)  Items subject to agreement between manufacturer and user.109
Annex F (normative)  Additional tests for circuit-breakers with electronic over-current
protection.110
Annex G (normative)  Power loss .140
Annex H (normative)  Test sequence for circuit-breakers for IT systems . 143

60947-2 © IEC:200660947-2  IEC:2006 – 5 – – 3 –
Annex J (normative)  Electromagnetic compatibility (EMC) – Requirements and test
methods for circuit-breakers.145
Annex K (informative) Glossary of symbols related to products covered by this standard.159
Annex L (normative)  Circuit-breakers not fulfilling the requirements for overcurrent

protection.161
Annex M (normative)  Modular residual current devices (without integral current
breaking device).166
Annex N (normative)  Electromagnetic compatibility (EMC) – Additional requirements
and test methods for devices not covered by Annexes B, F and M .211
Annex O  Instantaneous trip circuit-breakers (ICB) .215

Bibliography .218

Figure 1 – Test arrangement (connecting cables not shown) for short-circuit tests . 65
Figure A.1 – Over-current co-ordination between a circuit-breaker and a fuse or back-up
protection by a fuse: operating characteristics .7 1
Figure A.2 Figure A.3.72
Total discrimination between two circuit-breakers .72
Figure A.4 Figure A.5.73
Back-up protection by a circuit-breaker – Operating characteristics.73
Figure A.6 – Example of test circuit for conditional short-circuit breaking capacity tests
showing cable connections for a 3-pole circuit-breaker (C ).74
Figure B.1 – Test circuit for the verification of the operating characteristic (see B.8.2) .99
Figure B.2 – Test circuit for the verification of the limiting value of the non-operating
current under over-current conditions (see B.8.5) . 100
Figure B.3 – Test circuit for the verification of the behaviour of CBRs classified under
B.3.1.2.2 (see B.8.9) .101
Figure B.4 – Current ring wave 0,5 µs/100 kHz .102
Figure B.5 – Example of test circuit for the verification of resistance to unwanted
tripping .103
Figure B.6 – Surge current wave 8/20 µs .103
Figure B.7 – Test circuit for the verification of resistance to unwanted tripping in case of
flashover without follow-on current (B.8.6.2) .104
Figure B.8 – Test circuit for the verification of the correct operation of CBRs, in the case
of residual pulsating direct currents (see B.8.7.2.1, B.8.7.2.2 and B.8.7.2.3) .105
Figure B.9 – Test circuit for the verification of the correct operation of CBRs, in the case
of a residual pulsating direct current superimposed by a smooth direct residual current
(see B.8.7.2.4) .106
Figure F.1 – Representation of test current produced by back-to-back thyristors in
accordance with F.4.1 .119
Figure F.2 – Test circuit for immunity and emission tests in accordance with F.4.1.3,
F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 – Two phase poles in series.120
Figure F.3 – Test circuit for immunity and emission tests in accordance with F.4.1.3,
F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 – Three phase poles in series . 121

60947-2  IEC:2006 – 7 – – 4 – 60947-2 © IEC:2006
Figure F.4 – Test circuit for immunity and emission tests in accordance with F.4.1.3,
F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 – Three-phase connection .122
Figure F.5 – Test current for the verification of the influence of the current dips and
interr
...

IEC 60947-2 ®
Edition 4.1 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
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et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

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3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
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Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
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Vocabulaire Electrotechnique International en ligne.
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Service clients ou contactez-nous:
Email: [e-mail]
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IEC 60947-2 ®
Edition 4.1 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CU
CODE PRIX
ICS 29.130.20 ISBN 978-2-88910-337-9
– 2 – 60947-2 © IEC:2006+A1:2009
CONTENTS
FOREWORD.7
1 General .9
1.1 Scope and object.9
1.2 Normative references .10
2 Definitions .12
3 Classification .16
4 Characteristics of circuit-breakers.16
4.1 Summary of characteristics.16
4.2 Type of circuit-breaker.17
4.3 Rated and limiting values of the main circuit.17
4.4 Selectivity categories .21
4.5 Control circuits .21
4.6 Auxiliary circuits .22
4.7 Releases .22
4.8 Integral fuses (integrally fused circuit-breakers) .23
5 Product information.23
5.1 Nature of the information .23
5.2 Marking .24
5.3 Instructions for installation, operation and maintenance.25
6 Normal service, mounting and transport conditions.25
7 Constructional and performance requirements .25
7.1 Constructional requirements .25
7.2 Performance requirements.27
7.3 Electromagnetic compatibility (EMC) .33
8 Tests .33
8.1 Kind of tests .33
8.2 Compliance with constructional requirements.33
8.3 Type tests .33
8.4 Routine tests .64

Annex A (normative)  Co-ordination under short-circuit conditions between a circuit-
breaker and another short-circuit protective device associated in the same circuit.69
Annex B (normative)  Circuit-breakers incorporating residual current protection .78
Annex C (normative)  Individual pole short-circuit test sequence. 110
Annex D Vacant . 111
Annex E (informative)  Items subject to agreement between manufacturer and user. 112
Annex F (normative)  Additional tests for circuit-breakers with electronic over-current
protection. 113
Annex G (normative)  Power loss .143
Annex H (normative)  Test sequence for circuit-breakers for IT systems . 146
Annex J (normative)  Electromagnetic compatibility (EMC) – Requirements and test
methods for circuit-breakers. 148
Annex K (informative)  Glossary of symbols and graphical representation
of characteristics. 161

60947-2 © IEC:2006+A1:2009 – 3 –
Annex L (normative)  Circuit-breakers not fulfilling the requirements for overcurrent
protection. 170
Annex M (normative)  Modular residual current devices (without integral current
breaking device). 175
Annex N (normative)  Electromagnetic compatibility (EMC) – Additional requirements
and test methods for devices not covered by Annexes B, F and M . 219
Annex O  Instantaneous trip circuit-breakers (ICB) . 223

Bibliography . 226

Figure 1 – Test arrangement (connecting cables not shown) for short-circuit tests .68
Figure A.1 – Over-current co-ordination between a circuit-breaker and a fuse or back-up
protection by a fuse: operating characteristics .74
Figure A.2 Figure A.3.75
Total discrimination between two circuit-breakers .75
Figure A.4 Figure A.5.76
Back-up protection by a circuit-breaker – Operating characteristics.76
Figure A.6 – Example of test circuit for conditional short-circuit breaking capacity tests
showing cable connections for a 3-pole circuit-breaker (C ) .77
Figure B.1 – Test circuit for the verification of the operating characteristic (see B.8.2) . 102
Figure B.2 – Test circuit for the verification of the limiting value of the non-operating

current under over-current conditions (see B.8.5) . 103
Figure B.3 – Test circuit for the verification of the behaviour of CBRs classified under
B.3.1.2.2 (see B.8.9) . 104
Figure B.4 – Current ring wave 0,5 μs/100 kHz . 105
Figure B.5 – Example of test circuit for the verification of resistance to unwanted
tripping . 106
Figure B.6 – Surge current wave 8/20 μs . 106
Figure B.7 – Test circuit for the verification of resistance to unwanted tripping in case of
flashover without follow-on current (B.8.6.2) . 107
Figure B.8 – Test circuit for the verification of the correct operation of CBRs, in the case
of residual pulsating direct currents (see B.8.7.2.1, B.8.7.2.2 and B.8.7.2.3) . 108
Figure B.9 – Test circuit for the verification of the correct operation of CBRs, in the case
of a residual pulsating direct current superimposed by a smooth direct residual current
(see B.8.7.2.4) . 109
Figure F.1 – Representation of test current produced by back-to-back thyristors in
accordance with F.4.1 . 122
Figure F.2 – Test circuit for immunity and emission tests in accordance with F.4.1.3,
F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 – Two phase poles in series. 123
Figure F.3 – Test circuit for immunity and emission tests in accordance with F.4.1.3,
F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 – Three phase poles in series . 124
Figure F.4 – Test circuit for immunity and emission tests in accordance with F.4.1.3,
F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2
...

IEC 60947-2 ®
Edition 4.2 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les
microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

Useful links:
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The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

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La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes
publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000
référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que
Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.
publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique
International (VEI) en ligne.
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Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions
contactez-nous: [e-mail].
IEC 60947-2 ®
Edition 4.2 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –

Part 2: Circuit-breakers
Appareillage à basse tension –

Partie 2: Disjoncteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-0636-2

– 2 – 60947-2  IEC:2006+A1:2009+A2:2013
CONTENTS
FOREWORD . 7
1 General . 9
1.1 Scope and object . 9
1.2 Normative references . 10
2 Definitions . 12
3 Classification . 16
4 Characteristics of circuit-breakers . 17
4.1 Summary of characteristics . 17
4.2 Type of circuit-breaker . 17
4.3 Rated and limiting values of the main circuit . 17
4.4 Selectivity categories . 20
4.5 Control circuits . 21
4.6 Auxiliary circuits . 21
4.7 Releases . 22
4.8 Integral fuses (integrally fused circuit-breakers) . 23
5 Product information. 23
5.1 Nature of the information . 23
5.2 Marking . 23
5.3 Instructions for installation, operation and maintenance . 25
6 Normal service, mounting and transport conditions . 25
7 Constructional and performance requirements . 25
7.1 Constructional requirements . 25
7.2 Performance requirements . 27
7.3 Electromagnetic compatibility (EMC) . 33
8 Tests . 33
8.1 Kind of tests . 33
8.2 Compliance with constructional requirements . 33
8.3 Type tests . 33
8.4 Routine tests . 65

Annex A (normative)  Co-ordination under short-circuit conditions between a circuit-
breaker and another short-circuit protective device associated in the same circuit . 70
Annex B (normative)  Circuit-breakers incorporating residual current protection . 81
Annex C (normative)  Individual pole short-circuit test sequence . 113
Annex D Vacant . 114
Annex E (informative)  Items subject to agreement between manufacturer and user. 115
Annex F (normative)  Additional tests for circuit-breakers with electronic over-current
protection . 116
Annex G (normative)  Power loss . 146
Annex H (normative)  Test sequence for circuit-breakers for IT systems . 149
Annex J (normative)  Electromagnetic compatibility (EMC) – Requirements and test

methods for circuit-breakers . 151
Annex K (informative)  Glossary of symbols and graphical representation
of characteristics . 164

60947-2  IEC:2006+A1:2009+A2:2013 – 3 –
Annex L (normative)  Circuit-breakers not fulfilling the requirements for overcurrent
protection . 173
Annex M (normative)  Modular residual current devices (without integral current
breaking device). 178
Annex N (normative)  Electromagnetic compatibility (EMC) – Additional requirements
and test methods for devices not covered by Annexes B, F and M . 222
Annex O  Instantaneous trip circuit-breakers (ICB) . 226

Bibliography . 229

Figure 1 – Test arrangement (connecting cables not shown) for short-circuit tests . 69
Figure A.1 – Over-current co-ordination between a circuit-breaker and a fuse or back-up
protection by a fuse: operating characteristics . 76
Figure A.2 Figure A.3 . 77
Total selectivity between two circuit-breakers . 77
Figure A.4 Figure A.5 . 78
Back-up protection by a circuit-breaker – Operating characteristics. 78
Figure A.6 – Example of test circuit for conditional short-circuit breaking capacity tests
showing cable connections for a 3-pole circuit-breaker (C ) . 79
Figure A.7 – Example of test circuit for the verification of selectivity . 80
Figure B.1 – Test circuit for the verification of the operating characteristic (see B.8.2) . 105
Figure B.2 – Test circuit for the verification of the limiting value of the non-operating
current under over-current conditions (see B.8.5) . 106
Figure B.3 – Test circuit for the verification of the behaviour of CBRs classified under
B.3.1.2.2 (see B.8.9) . 107
Figure B.4 – Current ring wave 0,5 µs/100 kHz . 108
Figure B.5 – Example of test circuit for the verification of resistance to unwanted
tripping . 109
Figure B.6 – Surge current wave 8/20 µs . 109
Figure B.7 – Test circuit for the verification of resistance to unwanted tripping in case of
flashover without follow-on current (B.8.6.2) . 110
Figure B.8 – Test circuit for the verification of the correct operation of CBRs, in the case
of residual pulsating direct currents (see B.8.7.2.1, B.8.7.2.2 and B.8.7.2.3) . 111
Figure B.9 – Test circuit for the verification of the correct operation of CBRs, in the case
of a residual pulsating direct current superimposed by a smooth direct residual current
(see B.8.7.2.4) . 112
Figure F.1 – Representation of test current produced by back-to-back thyristors in
accordance with F.4.1 . 125
Figure F.2 – Test circuit for immunity and emission tests in accordance with F.4.1.3,

F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2
...