SIST EN 60947-2:2017
(Main)Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2016)
Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2016)
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.
Circuit-breakers rated above 1 000 V a.c. but not exceeding 1 500 V a.c. may also be tested to
this standard.
It applies whatever the rated currents, the method of construction or the proposed applications
of the circuit-breakers may be.
The requirements for circuit-breakers which are also intended to provide earth leakage
protection are contained in Annex B.
The additional requirements for circuit-breakers with electronic over-current protection are
contained in Annex F.
The additional requirements for circuit-breakers for IT systems are contained in Annex H.
The requirements and test methods for electromagnetic compatibility of circuit-breakers are
contained in Annex J.
The requirements for circuit-breakers not fulfilling the requirements for over-current protection
are contained in Annex L.
The requirements for modular residual current devices (without integral current breaking
device) are contained in Annex M.
The requirements and test methods for electromagnetic compatibility of circuit-breaker
auxiliaries are contained in Annex N.
The requirements and test methods for d.c. circuit-breakers for use in photovoltaic (PV)
applications are contained in Annex P.
The requirements and test methods for circuit-breakers incorporating residual current
protection with automatic reclosing functions are contained in Annex R.
Supplementary requirements for circuit-breakers used as direct-on-line starters are given in
IEC 60947-4-1, applicable to low-voltage contactors and starters.
The requirements for circuit-breakers for the protection of wiring installations in buildings and
similar applications, and designed for use by uninstructed persons, are contained in
IEC 60898.
The requirements for circuit-breakers for equipment (for example electrical appliances) are
contained in IEC 60934.
For certain specific applications (for example traction, rolling mills, marine service) particular or
additional requirements may be necessary.
NOTE Circuit-breakers which are dealt with in this standard can be provided with devices for automatic opening
under predetermined conditions other than those of over-current and undervoltage as, for example, reversal of
power or current. This standard does not deal with the verification of operation under such pre-determined
conditions.
The object of this standard is to state:
a) the characteristics of circuit-breakers;
b) the conditions with which circuit-breakers shall comply with reference to:
1) operation and behaviour in normal service;
2) operation and behaviour in case of overload and operation and behaviour in case of
short-circuit, including co-ordination in service (selectivity and back-up protection);
3) dielectric properties;
c) tests intended for confirming that these conditions have been met and the methods to be
adopted for these tests;
d) information to be marked on or given with the apparatus.
Niederspannungsschaltgeräte - Teil 2: Leistungsschalter (IEC 60947-2:2016)
Appareillage à basse tension - Partie 2: Disjoncteurs (IEC 60947-2:2016)
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.
Nizkonapetostne stikalne naprave - 2. del: Odklopniki (IEC 60947-2:2016)
Zahteve in preskusne metode za odklopnike, ki vključujejo zaščito pred preostalim tokom z avtomatskim ponovnim vklopom, so v dodatku R.
Dodatne zahteve za odklopnike, ki se uporabljajo kot neposredni zaganjalniki, so podane v standardu IEC 60947-4-1, ki se uporablja za nizkonapetostne kontaktorje in zaganjalnike.
Zahteve za odklopnike za zaščito žičnih inštalacij v stavbah ter podobni načini uporabe in odklopnike, ki jih bodo uporabljale nepoučene osebe, so zajete v standardu IEC 60898.
Zahteve za odklopnike za opremo (npr. za električne aparate) so zajete v standardu IEC 60934.
Za določene uporabe (npr. vleka, valjarne, storitve v marinah) lahko veljajo posebne ali dodatne zahteve.
OPOMBA: Odklopniki, ki so obravnavani v tem standardu, imajo lahko naprave za avtomatsko odpiranje v vnaprej določenih pogojih, ki so drugačni od tistih za prenapetost in podnapetost, kot je sprememba moči ali toka. Ta standard ne obravnava preverjanja delovanja v takih vnaprej določenih pogojih.
Namen tega standarda je navesti:
a) značilnosti odklopnikov;
b) pogoje, s katerimi morajo odklopniki izpolnjevati zahteve glede na:
1) delovanje in obnašanje v običajnih pogojih;
2) delovanje in obnašanje pri preobremenitvi ter delovanje in obnašanje v primeru kratkega stika, vključno s koordinacijo delovanja (selektivnost in varnostna zaščita);
3) dielektrične lastnosti;
c) preskuse, katerih namen je potrditi, da so bili ti pogoji in metode izvajanja teh preskusov izpolnjeni;
d) podatke, ki jih je treba označiti na napravi ali jih priložiti napravi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60947-2:2017
01-december-2017
1DGRPHãþD
SIST EN 60947-2:2006
SIST EN 60947-2:2006/A1:2009
SIST EN 60947-2:2006/A2:2013
Nizkonapetostne stikalne naprave - 2. del: Odklopniki (IEC 60947-2:2016)
Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2016)
Niederspannungsschaltgeräte - Teil 2: Leistungsschalter (IEC 60947-2:2016)
Appareillage à basse tension - Partie 2: Disjoncteurs (IEC 60947-2:2016)
Ta slovenski standard je istoveten z: EN 60947-2:2017
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60947-2:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60947-2:2017
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SIST EN 60947-2:2017
EUROPEAN STANDARD EN 60947-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2017
ICS 29.130.20 Supersedes EN 60947-2:2006
English Version
Low-voltage switchgear and controlgear -
Part 2: Circuit-breakers
(IEC 60947-2:2016 + COR1:2016)
Appareillage à basse tension - Partie 2: Disjoncteurs Niederspannungsschaltgeräte - Teil 2: Leistungsschalter
(IEC 60947-2:2016 + COR1:2016) (IEC 60947-2:2016 + COR1:2016)
This European Standard was approved by CENELEC on 2016-07-12. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60947-2:2017 E
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SIST EN 60947-2:2017
EN 60947-2:2017
European foreword
The text of document 121A/71/FDIS, future edition 5 of IEC 60947-2, prepared by
SC 121A “Low-voltage switchgear and controlgear” of IEC/TC 121 “Switchgear and controlgear and
their assemblies for low voltage” was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 60947-2:2017.
The following dates are fixed:
• latest date by which the document has to be (dop) 2018-04-13
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2020-10-13
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60947-2:2006.
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 has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directives.
For the relationship with EU Directives and the standardization requests see informative Annex ZZA
and Annex ZZB, which are integral parts of this document.
Endorsement notice
The text of the International Standard IEC 60947-2:2016 + COR1:2016 was approved by CENELEC
as a European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60051 Series NOTE Harmonized as EN 60051 Series.
IEC 60112 NOTE Harmonized as EN 60112.
IEC 60898 Series NOTE Harmonized as EN 60898 Series.
IEC 60934 NOTE Harmonized as EN 60934.
IEC 60947-3 NOTE Harmonized as EN 60947-3.
IEC 60947-5-1 NOTE Harmonized as EN 60947-5-1.
IEC 61000-4-13 NOTE Harmonized as EN 61000-4-13.
IEC 61008-1:2010 NOTE Harmonized as EN 61008-1:2012 (modified).
IEC 61008-1:2010/A1:2012 NOTE Harmonized as EN 61008-1:2012/A1:2014 (modified).
IEC 61008-1:2010/A2:2013 NOTE Harmonized as EN 61008-1:2012/A2:2014 (modified).
IEC 61009-1:2010 NOTE Harmonized as EN 61009-1:2012 (modified).
IEC 61009-1:2010/A1:2012 NOTE Harmonized as EN 61009-1:2012/A1:2014 (modified).
IEC 61009-1:2010/A2:2013 NOTE Harmonized as EN 61009-1:2012/A2:2014 (modified).
IEC 61131-1:2003 NOTE Harmonized as EN 61131-1:2003 (not modified).
IEC 61439 Series NOTE Harmonized as EN 61439 Series.
2
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SIST EN 60947-2:2017
EN 60947-2:2017
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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.cenelec.eu
Publication Year Title EN/HD Year
IEC 60068-2-14 - Environmental testing - EN 60068-2-14 2009
Part 2-14: Tests - Test N: Change of
temperature
IEC 60068-2-30 - Environmental testing - EN 60068-2-30 2005
Part 2-30: Tests - Test Db: Damp heat,
cyclic (12 h + 12 h cycle)
IEC 60269-1 2006 Low-voltage fuses - EN 60269-1 2007
Part 1: General requirements
IEC 60364 Series Low-voltage electrical installations HD 60364 Series
IEC 60664-1 2007 Insulation coordination for equipment EN 60664-1 2007
within low-voltage systems -
Part 1: Principles, requirements and tests
IEC 60947-1 2007 Low-voltage switchgear and controlgear - EN 60947-1 2007
Part 1: General rules
+A1 2010 +A1 2011
+A2 2014 +A2 2014
IEC 60947-4-1 - Low-voltage switchgear and controlgear - EN 60947-4-1 2010
Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-
starters
IEC 61000-3-2 - Electromagnetic compatibility (EMC) - EN 61000-3-2 2014
Part 3-2: Limits - Limits for harmonic
current emissions (equipment input current
≤ 16 A per phase)
IEC 61000-3-3 - Electromagnetic compatibility (EMC) - EN 61000-3-3 2013
Part 3-3: Limits - Limitation of voltage
changes, voltage fluctuations and flicker in
public low-voltage supply systems, for
equipment with rated current ≤ 16 A per
phase and not subject to conditional
connection
IEC 61000-4-2 - Electromagnetic compatibility (EMC) - EN 61000-4-2 2009
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
3
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SIST EN 60947-2:2017
EN 60947-2:2017
Publication Year Title EN/HD Year
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - EN 61000-4-3 2006
Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
+A1 2007 +A1 2008
+A2 2010 +A2 2010
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - EN 61000-4-4 2012
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - EN 61000-4-5 2014
Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - EN 61000-4-6 2014
Part 4-6: Testing and measurement
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields
IEC 61000-4-11 - Electromagnetic compatibility (EMC) - EN 61000-4-11 2004
Part 4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests
IEC 61140 - Protection against electric shock - EN 61140 2016
Common aspects for installation and
equipment
IEC 62475 2010 High-current test techniques - Definitions EN 62475 2010
and requirements for test currents and
measuring systems
CISPR 11 - Industrial, scientific and medical EN 55011 2016
equipment - Radio-frequency disturbance
characteristics - Limits and methods of
measurement
1)
CISPR 22 - Information technology equipment - Radio EN 55022 2010
1)
disturbance characteristics - Limits and + AC 2011
methods of measurement
1)
Superseded by EN 50561-1:2013.
4
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SIST EN 60947-2:2017
EN 60947-2:2017
Annex ZZA
(informative)
Relationship between this European standard and the essential requirements
of Directive 2014/30/EU [2014 OJ L96] aimed to be covered and the
standardisation request M/552
This European standard has been prepared under the European Commission standardisation request
1
C(2016) 7641 final of 30.11.2016 , ('M/552'), as regards harmonised standards in support of Directive
2014/30/EU relating to electromagnetic compatibility, to provide one voluntary means of conforming to
essential requirements of Directive 2014/30/EU of the European Parliament and of the Council of 26
February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic
compatibility [2014 OJ L96].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZA.1 confers, within the limits
of the scope of this standard, a presumption of conformity with the corresponding essential
requirements of that Directive, and associated EFTA regulations.
Table ZZA.1 – Correspondence between this European standard and the
Essential Requirements set out in Directive 2014/30/EU [2014 OJ L96]
Clause(s) / sub-clause(s)
Essential requirements of
Remarks / Notes
Directive 2014/30/EU
of this EN
Annex I. 1(a) (electromagnetic 7.3, B.7.3, B.8.12.2, F.5, J.1,
J.3, M.7.2.12, M.8.16.2, N.3,
disturbances)
P.7.3 and no others.
Annex I. 1(b) (electromagnetic 7.3, B.7.3, B.8.12.1, F.2.2, F.3, Full coverage of requirements
F.4, J.1, J.2, M.7.2.12, for conducted and radiated
immunity)
M.8.16.1, N.1, N.2, P.7.3 and disturbances in the range
no others. 150 kHz to 2,7 GHz
WARNING 1: Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2: Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
1
COMMISSION IMPLEMENTING DECISION C(2016) 7641 final of 30.11.2016 on a standardisation request to the
European Committee for Standardisation, to the European Committee for Electrotechnical Standardisation and to the
European Telecommunications Standards Institute as regards harmonised standards in support of Directive 2014/30/EU
of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member
States relating to electromagnetic compatibility.
5
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SIST EN 60947-2:2017
EN 60947-2:2017
Annex ZZB
(informative)
Relationship between this European standard and the safety objectives of
Directive 2014/35/EU [2014 OJ L96] aimed to be covered
This European Standard has been prepared under a Commission’s standardization request relating to
harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means
of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the
Council of 26 February 2014 on the harmonization of the laws of the Member States relating to the
making available on the market of electrical equipment designed for use within certain voltage limits
[2014 OJ L96].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZB.1 confers, within the limits
of the scope of this standard, a presumption of conformity with the corresponding safety objectives of
that Directive, and associated EFTA regulations.
Table ZZB.1 – Correspondence between this European standard and Annex I of Directive
2014/35/EU [2014 OJ L96]
Safety objectives of Directive Clause(s) / sub-clause(s) of this EN Remarks/note
2014/35/EU
1 a) Foreword, 1.1, 4, 5, B.5, H.5, L.5,
M.5, O.5, P.5, R.5
1 b) 5, L.5, M.5, O.4, P.5
1 c) 5.3
2 a) 5.2, 5.3, 7.1.3, 7.1.4, 7.2.3, 8.3, 8.4
2 b) 7.2.2, 7.3, 8.3.2, F.1, J.3
2 c) 5.3, 7.1, 7.1.2, 7.1.3, 7.1.5, 7.2.1, 7.3,
8.3.3 to 8.3.6, 8.4, 8.5, F.1, J.2, J.3
2 d) 5.2, 7.1.3, 7.1.4, 7.2.3, 8.3.2, F.2.2
3 a) 5.3, 7.1.2, 7.1.5, 7.2.1, 8.3.3 to 8.3.6,
8.4, 8.5
3 b) 7.3, F.1, J.3
3 c) 1.1, 7.2, 8.3
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
6
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SIST EN 60947-2:2017
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
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60947-2:2017
– 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
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SIST EN 60947-2:2017
IEC 60947-2:2016 © IEC 2016 – 3 –
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 . 72
8.4 Routine tests . 73
8.4.1 General . 73
8.4.2 Mechanical operation tests . 74
8.4.3 Verification of the calibration of overcurrent releases . 74
8.4.4 Verification of the operation of undervoltage and shunt releases . 75
8.4.5 Additional tests for CBRs . 75
8.4.6 Dielectric tests . 75
8.4.7 Test for the verification of clearances less than those corresponding to
case A of Table 13 of IEC 60947-1:2007 . 76
8.5 Special tests – Damp heat, salt mist, vibration and shock . 76
Annex A (normative) Co-ordination between a circuit-breaker and another short-circuit
protective device associated in the same circuit . 79
A.1 General . 79
A.2 Scope and object . 79
A.3 General requirements for the co-ordination of a circuit-breaker with another
SCPD . 80
A.3.1 General considerations . 80
A.3.2 Take-over current . 80
A.3.3 Behaviour of C in association with another SCPD . 80
1
A.4 Type and characteristics of the associated SCPD . 80
A.5 Verification of selectivity . 81
A.5.1 General . 81
A.5.2 Consideration of selectivity by desk study . 81
A.5.3 Selectivity determined by test . 82
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A.6 Verification of back-up protection . 83
A.6.1 Determination of the take-over current . 83
A.6.2 Verification of back-up protection . 83
A.6.3 Tests for verification of back-up protection . 83
A.6.4 Results to be obtained . 84
Annex B (normative) Circuit-breakers incorporating residual current protection . 90
B.1 General . 90
B.1.1 Preamble . 90
B.1.2 Scope and object . 90
B.2 Terms and definitions . 91
B.2.1 Terms and definitions relating to currents flowing from live parts to
earth . 91
B.2.2 Terms and definitions relating to the energization of a CBR . 91
B.2.3 Terms and definitions relating to the operation and the functions of a
CBR . 92
B.2.4 Terms and definitions relating to values and ranges of energizing
quantities . 93
B.3 Classification . 94
B.3.1 Classification according to the method of operation of the residual
current function . 94
B.3.2 Classification according to the possibility of adjusting the residual
operating current . 94
B.3.3 Classification according to time-delay of the residual current function . 94
B.3.4 Classification according to behaviour in presence of a d.c. component . 94
B.4 Characteristics of CBRs concerning their residual current function . 94
B.4.1 Rated values . 94
B.4.2 Preferred and limiting values . 95
B.4.3 Value of the rated residual short-circuit making and breaking capacity
(I ) . 96
∆m
B.4.4 Operating characteristics in case of an earth fault current in the
presence or absence of a d.c. component . 96
B.5 Marking .
...
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