IEC 60947-2:2016
(Main)Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
IEC 60947-2:2016 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. This fifth edition cancels and replaces the fourth edition published in 2006, Amendment 1:2009 and Amendment 2:2013. This edition constitutes a technical revision. This edition includes the following significant additions with respect to the previous edition:
- tests for verification of selectivity in Annex A (see A.5.3);
- critical load current tests for d.c. circuit-breakers (see 8.3.9);
- new Annex P for circuit-breakers for use in photovoltaic applications;
- new Annex R for residual-current circuit-breakers with automatic reclosing functions. The contents of the corrigendum of November 2016 have been included in this copy.
Appareillage à basse tension - Partie 2: Disjoncteurs
L'IEC 60947-2:2016 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 exigences supplémentaires pour les disjoncteurs à fusibles incorporés. Cette cinquième édition annule et remplace la quatrième édition parue en 2006, l'Amendement 1:2009 et l'Amendement 2:2013. Cette édition constitue une révision technique. Cette édition inclut les additions techniques majeures suivantes par rapport à l'édition précédente:
- essais pour la vérification de la sélectivité dans l'Annexe A (voir A.5.3),
- essais de courants de charge critiques pour disjoncteurs à courant continu (voir 8.3.9),
- nouvelle Annexe P relative aux disjoncteurs pour utilisation dans des applications photovoltaïques,
- nouvelle Annexe R relative aux disjoncteurs de courant différentiel résiduel avec fonctions de refermeture automatique. Le contenu du corrigendum de novembre 2016 a été pris en considération dans cet exemplaire.
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IEC 60947-2 ®
Edition 5.0 2016-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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About the IEC
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International Standards for all electrical, electronic and related technologies.
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IEC 60947-2 ®
Edition 5.0 2016-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-3456-3
– 2 – IEC 60947-2:2016 RLV © IEC 2016
CONTENTS
FOREWORD . 14
1 General . 16
1.1 Scope and object . 16
1.2 Normative references . 17
2 Terms and definitions . 19
3 Classification . 24
4 Characteristics of circuit-breakers . 24
4.1 Summary of characteristics . 24
4.2 Type of circuit-breaker . 25
4.3 Rated and limiting values of the main circuit . 25
4.3.1 General . 25
4.3.2 Rated voltages . 25
4.3.3 Currents . 25
4.3.4 Rated frequency . 26
4.3.5 Rated duty . 26
4.3.6 Short-circuit characteristics . 26
4.4 Utilization Selectivity categories . 29
4.5 Control circuits . 30
4.5.1 Electrical control circuits . 30
4.5.2 Air-supply control circuits (pneumatic or electro-pneumatic) . 30
4.6 Auxiliary circuits . 30
4.7 Releases . 30
4.7.1 Types . 30
4.7.2 Characteristics . 31
4.7.3 Current setting of over-current releases . 31
4.7.4 Tripping time setting of over-current releases . 31
4.8 Integral fuses (integrally fused circuit-breakers) . 32
5 Product information . 32
5.1 Nature of the information . 32
5.2 Marking . 32
5.3 Instructions for installation, operation and maintenance . 33
6 Normal service, mounting and transport conditions . 34
7 Constructional and performance requirements . 34
7.1 Constructional requirements . 34
7.1.1 General . 34
7.1.2 Withdrawable circuit-breakers . 34
7.1.3 Additional requirements for circuit-breakers suitable for isolation . 35
7.1.4 Clearances and creepage distances . 35
7.1.5 Requirements for the safety of the operator . 35
7.1.6 List of construction breaks . 35
7.1.7 Additional requirements for circuit-breakers provided with a neutral pole . 36
7.1.8 Digital inputs and outputs for use with programmable logic controllers
(PLCs) . 36
7.2 Performance requirements . 36
7.2.1 Operating conditions . 36
7.2.2 Temperature-rise . 38
7.2.3 Dielectric properties . 39
7.2.4 Ability to make and break under no load, normal load and overload
conditions . 40
7.2.5 Ability to make and break under short-circuit conditions . 41
7.2.6 Vacant . 41
7.2.7 Additional requirements for circuit-breakers suitable for isolation . 41
7.2.8 Specific requirements for integrally fused circuit-breakers. 41
7.2.9 Co-ordination between a circuit-breaker and another short-circuit
protective device . 42
7.3 Electromagnetic compatibility (EMC) . 42
8 Tests . 42
8.1 Kind of tests . 42
8.1.1 General . 42
8.1.2 Type tests . 42
8.1.3 Routine tests . 42
8.2 Compliance with constructional requirements . 43
8.3 Type tests . 43
8.3.1 Test sequences . 43
8.3.2 General test conditions. 52
8.3.3 Test sequence I: General performance characteristics . 61
8.3.4 Test sequence II: Rated service short-circuit breaking capacity. 71
8.3.5 Test sequence III: Rated ultimate short-circuit breaking capacity . 72
8.3.6 Test sequence IV: Rated short-time withstand current . 74
8.3.7 Test sequence V: Performance of integrally fused circuit-breakers. 75
8.3.8 Test sequence VI: combined test sequence . 77
8.3.9 Critical d.c. load current test . 78
8.4 Routine tests . 79
8.4.1 General . 79
8.4.2 Mechanical operation tests . 80
8.4.3 Verification of the calibration of overcurrent releases . 80
8.4.4 Verification of the operation of undervoltage and shunt releases . 81
8.4.5 Additional tests for CBRs . 81
8.4.6 Dielectric tests . 81
8.4.7 Test for the verification of clearances less than those corresponding to
case A of Table 13 of IEC 60947-1:2007 . 82
8.5 Special tests – Damp heat, salt mist, vibration and shock . 82
Annex A (normative) Co-ordination under short circuit conditions between a circuit-
breaker and another short-circuit protective device associated in the same circuit . 85
A.1 Introduction General . 85
A.2 Scope and object . 86
A.3 General requirements for the co-ordination of a circuit-breaker with another
SCPD . 86
A.3.1 General considerations . 86
A.3.2 Take-over current. 86
A.3.3 Behaviour of C in association with another SCPD . 86
A.4 Type and characteristics of the associated SCPD . 86
A.5 Verification of discrimination selectivity . 87
A.5.1 General . 87
A.5.2 Consideration of selectivity by desk study . 88
A.5.3 Selectivity determined by test . 89
– 4 – IEC 60947-2:2016 RLV © IEC 2016
A.6 Verification of back-up protection . 89
A.6.1 Determination of the take-over current . 89
A.6.2 Verificati
...
COR1:2019 IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
IEC 60947-2 IEC 60947-2
Edition 5.1 2019-07 Edition 5.1 2019-07
Low-voltage switchgear and controlgear – Appareillage à basse tension –
Part 2: Circuit-breakers Partie 2: Disjoncteurs
CO RRI G E NDUM 1
Corrections to the French version appear after the English text.
Les corrections à la version française sont données après le texte anglais.
8.3 Type tests
In the last paragraph, replace "in below" by "below".
8.3.2.1 General requirements
Cancel replacement of the second paragraph
Replace the existing second paragraph after the note by the following new paragraph:
For the tests in free air concerning overload performance, short-circuit, and short-time
withstand current where applicable, a metallic screen shall be placed on all sides of the
circuit-breaker in accordance with the manufacturer’s instructions. Details, including distances
of the metallic screen from the circuit-breaker, shall be stated in the test report.
Figure M.18 – Test circuit for the verification of the behaviour of MRCDs with separate
sensing means in the case of a failure of the connection of the sensing means
Replace the existing Key with the following new one:
Key
I separate voltage source, if applicable T sensing means
V voltmeter C output circuit
S multi-pole switch G , G generators
1 1 2
S auxiliary switch Osc oscilloscope
a
– 2 – IEC 60947-2:2016+AMD1:2019 CSV/
COR1:2019 IEC 2019
Figure M.19 – Test circuit for the verification of the behaviour of MRCD with separate
sensing means under short-circuit conditions
Replace the existing Key with the following new one:
Key
S power supply L adjustable reactor
I separate voltage source, if applicable R adjustable resistor
V voltmeter Z adjustable impedance
A ammeter T sensing means
S auxiliary switch C output circuit
a
SC short-circuit switch D instrument indicating the change of status
...
IEC 60947-2 ®
Edition 5.0 2016-06
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
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et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
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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.
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bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
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The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60947-2 ®
Edition 5.0 2016-06
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 978-2-8322-3355-9
– 2 – IEC 60947-2:2016 © IEC 2016
CONTENTS
FOREWORD . 14
1 General . 16
1.1 Scope and object . 16
1.2 Normative references . 17
2 Terms and definitions. 18
3 Classification . 22
4 Characteristics of circuit-breakers . 23
4.1 Summary of characteristics . 23
4.2 Type of circuit-breaker . 23
4.3 Rated and limiting values of the main circuit . 23
4.3.1 General . 23
4.3.2 Rated voltages . 23
4.3.3 Currents . 24
4.3.4 Rated frequency . 24
4.3.5 Rated duty . 24
4.3.6 Short-circuit characteristics . 24
4.4 Selectivity categories . 27
4.5 Control circuits . 27
4.5.1 Electrical control circuits . 27
4.5.2 Air-supply control circuits (pneumatic or electro-pneumatic) . 27
4.6 Auxiliary circuits . 27
4.7 Releases . 28
4.7.1 Types . 28
4.7.2 Characteristics . 28
4.7.3 Current setting of over-current releases . 28
4.7.4 Tripping time setting of over-current releases . 29
4.8 Integral fuses (integrally fused circuit-breakers) . 29
5 Product information . 29
5.1 Nature of the information . 29
5.2 Marking . 29
5.3 Instructions for installation, operation and maintenance . 31
6 Normal service, mounting and transport conditions . 31
7 Constructional and performance requirements. 31
7.1 Constructional requirements . 31
7.1.1 General . 31
7.1.2 Withdrawable circuit-breakers . 31
7.1.3 Additional requirements for circuit-breakers suitable for isolation . 32
7.1.4 Clearances and creepage distances . 32
7.1.5 Requirements for the safety of the operator . 32
7.1.6 List of construction breaks. 32
7.1.7 Additional requirements for circuit-breakers provided with a neutral pole . 33
7.1.8 Digital inputs and outputs for use with programmable logic controllers
(PLCs) . 33
7.2 Performance requirements . 33
7.2.1 Operating conditions . 33
7.2.2 Temperature-rise . 36
7.2.3 Dielectric properties . 37
7.2.4 Ability to make and break under no load, normal load and overload
conditions . 37
7.2.5 Ability to make and break under short-circuit conditions . 38
7.2.6 Vacant . 38
7.2.7 Additional requirements for circuit-breakers suitable for isolation . 38
7.2.8 Specific requirements for integrally fused circuit-breakers . 39
7.2.9 Co-ordination between a circuit-breaker and another short-circuit
protective device . 39
7.3 Electromagnetic compatibility (EMC) . 39
8 Tests . 39
8.1 Kind of tests . 39
8.1.1 General . 39
8.1.2 Type tests . 39
8.1.3 Routine tests . 40
8.2 Compliance with constructional requirements . 40
8.3 Type tests . 40
8.3.1 Test sequences . 40
8.3.2 General test conditions . 48
8.3.3 Test sequence I: General performance characteristics . 56
8.3.4 Test sequence II: Rated service short-circuit breaking capacity . 65
8.3.5 Test sequence III: Rated ultimate short-circuit breaking capacity . 66
8.3.6 Test sequence IV: Rated short-time withstand current . 68
8.3.7 Test sequence V: Performance of integrally fused circuit-breakers . 69
8.3.8 Test sequence VI: combined test sequence . 71
8.3.9 Critical d.c. load current test .
...
IEC 60947-2 ®
Edition 5.1 2019-07
CONSOLIDATED VERSION
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
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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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
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3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
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and withdrawn publications. Also known as the International Electrotechnical Vocabulary
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If you wish to give us your feedback on this publication or CISPR.
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en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
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IEC 60947-2 ®
Edition 5.1 2019-07
CONSOLIDATED VERSION
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
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-7150-6
IEC 60947-2 ®
Edition 5.1 2019-07
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
– 2 – IEC 60947-2:2016+AMD1:2019 CSV
© IEC 2019
CONTENTS
FOREWORD . 15
1 General . 17
1.1 Scope and object . 17
1.2 Normative references . 18
2 Terms and definitions . 19
3 Classification . 23
4 Characteristics of circuit-breakers. 24
4.1 Summary of characteristics . 24
4.2 Type of circuit-breaker . 24
4.3 Rated and limiting values of the main circuit . 25
4.3.1 General. 25
4.3.2 Rated voltages . 25
4.3.3 Currents. 25
4.3.4 Rated frequency . 26
4.3.5 Rated duty . 26
4.3.6 Short-circuit characteristics . 26
4.4 Selectivity categories . 28
4.5 Control circuits . 28
4.5.1 Electrical control circuits . 28
4.5.2 Air-supply control circuits (pneumatic or electro-pneumatic) . 29
4.6 Auxiliary circuits . 29
4.7 Releases. 29
4.7.1 Types . 29
4.7.2 Characteristics . 29
4.7.3 Current setting of over-current releases . 30
4.7.4 Tripping time setting of over-current releases . 30
4.8 Integral fuses (integrally fused circuit-breakers) . 30
5 Product information . 31
5.1 Nature of the information . 31
5.2 Marking . 31
5.3 Instructions for installation, operation and maintenance . 34
6 Normal service, mounting and transport conditions . 34
7 Constructional and performance requirements . 34
7.1 Constructional requirements . 34
7.1.1 General. 34
7.1.2 Withdrawable circuit-breakers . 35
7.1.3 Additional requirements for circuit-breakers suitable for isolation . 35
7.1.4 Clearances and creepage distances . 35
7.1.5 Requirements for the safety of the operator . 35
7.1.6 List of construction breaks . 35
7.1.7 Additional requirements for circuit-breakers provided with a neutral
pole . 36
7.1.8 Digital inputs and outputs for use with programmable logic controllers
(PLCs) . 36
7.2 Performance requirements . 36
7.2.1 Operating conditions . 36
© IEC 2019
7.2.2 Temperature-rise . 39
7.2.3 Dielectric properties . 40
7.2.4 Ability to make and break under no load, normal load and overload
conditions . 41
7.2.5 Ability to make and break under short-circuit conditions . 42
7.2.6 Vacant . 42
7.2.7 Additional requirements for circuit-breakers suitable for isolation . 42
7.2.8 Specific requirements for integrally fused circuit-breakers . 42
7.2.9 Co-ordination between a circuit-breaker and another short-circuit
protective device . 42
7.3 Electromagnetic compatibility (EMC) . 42
8 Tests . 42
8.1 Kind of tests . 42
8.1.1 General. 42
8.1.2 Type tests . 43
8.1.3 Routine tests . 43
8.2 Compliance with constructional requirements . 43
8.3 Type tests . 43
8.3.1 Test sequences . 44
8.3.2 General test conditions . 51
8.3.3 Test sequence I: General performance characteristics . 60
8.3.4 Test sequence II: Rated service short-circuit breaking capacity . 69
8.3.5 Test sequence III: Rated ultimate short-circuit breaking capacity . 71
8.3.6 Test sequence IV: Rated short-time withstand current . 72
8.3.7 Test sequence V: Performance of integrally fused circuit-breakers. 73
8.3.8 Test sequence VI: combined test sequence . 75
8.3.9 Critical d.c. load current test . 77
8.4 Routine tests.
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