SIST EN IEC 60947-2:2025
(Main)Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2024)
Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2024)
IEC 60947-2:2024 applies to circuit-breakers, intended to be installed and operated by instructed or skilled persons, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC; it also contains additional requirements for integrally fused circuit-breakers.
This document also applies to circuit-breakers with ratings at or below 1 000 V AC, additionally having one or more ratings above 1 000 V AC but not exceeding 1 500 V AC.
This sixth edition cancels and replaces the fifth edition published in 2016 and its Amendment 1: 2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) suitability for isolation (see Clause 1);
b) removal of the classification according to the interrupting medium, according to the design, according to the suitability for isolation (see Clause 4);
c) adjustment of current settings with an external device connectable to the release (see 5.7.3);
d) requirements for circuits with protective separation (see 8.2.3.8);
e) additional tests for ground-fault overcurrent releases (see 9.3.4.2.5);
f) additional tests concerning dielectric properties in tripped position (see 9.3.4.3);
g) use of DC voltage for dielectric tests (see 9.3.4.6.2 and 9.4.6);
h) tests of individual pole breaking capacity under phase-to-neutral AC voltage (see 9.3.11);
i) improvement of measurement of power loss in Annex G;
j) changes in EMC tests (see Annex J);
k) introduction of CBI class W in Annex L.
Niederspannungsschaltgeräte - Teil 2: Leistungsschalter (IEC 60947-2:2024)
Appareillage à basse tension - Partie 2: Disjoncteurs (IEC 60947-2:2024)
L'IEC 60947-2:2024 s'applique aux disjoncteurs destinés à être installés et utilisés par des personnes qualifiées ou compétentes, et 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; il contient aussi des exigences supplémentaires pour les disjoncteurs à fusibles incorporés.
Le présent document s'applique également aux disjoncteurs dont les caractéristiques assignées sont inférieures ou égales à 1 000 V en courant alternatif, qui ont en outre une ou plusieurs caractéristiques assignées supérieures à 1 000 V en courant alternatif, sans toutefois dépasser 1 500 V en courant alternatif.
Cette sixième édition annule et remplace la cinquième édition parue en 2016 et son Amendement 1:2019. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) aptitude au sectionnement (voir Article 1) ;
b) suppression de la classification selon le milieu de coupure, selon la conception et selon l'aptitude au sectionnement (voir Article 4);
c) ajustement du courant de réglage avec un dispositif externe connectable au déclencheur (voir 5.7.3) ;
d) exigences pour les circuits avec séparation de protection (voir 8.2.3.8);
e) essais supplémentaires pour les déclencheur à maximum de courant de défaut à la terre (voir 9.3.4.2.5);
f) essais supplémentaires concernant les propriétés diélectriques en position de déclenchement (voir 9.3.4.3) ;
g) utilisation de la tension continue pour les essais diélectriques (voir 9.3.4.6.2 et 9.4.6);
h) essais du pouvoir de coupure sur un pôle séparément à la tension phase-neutre alternative (voir 9.3.11);
i) amélioration du mesurage de la perte de puissance à l'Annexe G;
j) changements dans les essais CEM (voir Annexe J) ;
k) introduction des CBI de classe W à l'Annexe L.
Nizkonapetostne stikalne in krmilne naprave - 2. del: Odklopniki (IEC 60947-2:2024)
Ta dokument se uporablja za odklopnike, ki jih lahko namestijo in upravljajo le poučene ali usposobljene osebe, katerih glavni kontakti so namenjeni za povezavo s tokokrogi in katerih nazivna napetost ne presega 1000 V AC ali 1500 V DC. Vsebuje tudi dodatne zahteve za odklopnike z vgrajeno varovalko.
Ta dokument se uporablja tudi za odklopnike z nazivnimi vrednostmi 1000 V AC ali manj, pri čemer je lahko ena ali več vrednosti nad 1000 V AC, vendar ne več kot 1500 V AC.
Uporablja se ne glede na nazivne toke, metodo konstrukcije ali predlagano uporabo odklopnikov.
Odklopniki v skladu s tem dokumentom so primerni za izolacijo.
Zahteve za odklopnike, ki zagotavljajo tudi zaščito pred preostalim tokom, so podane v dodatku B.
Dodatne zahteve za odklopnike, namenjene za povezovanje prevodnikov iz aluminija, so podane v dodatku D.
Dodatne zahteve za odklopnike z elektronsko nadtokovno zaščito so podane v dodatku F.
Dodatne zahteve za odklopnike za sisteme IT so podane v dodatku H.
Zahteve in preskusne metode za elektromagnetno združljivost odklopnikov so podane v dodatku J.
Zahteve za odklopnike, ki ne izpolnjujejo zahtev za nadtokovno zaščito, so podane v dodatku L.
Zahteve za modularne naprave s preostalim tokom (brez vgrajene odklopne naprave) so podane v dodatku M.
Zahteve in preskusne metode za elektromagnetno združljivost dodatkov odklopnika so podane v dodatku N.
Zahteve za odklopnike s trenutnim vklopom so podane v dodatku O.
Zahteve in preskusne metode za odklopnike, ki se uporabljajo v fotonapetostnih (PV) aplikacijah pri enosmernem toku, so podane v dodatku P.
Zahteve in preskusne metode za odklopnike, ki vključujejo zaščito pred preostalim tokom z avtomatskim ponovnim vklopom, so podane 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 z nadtokovno zaščito inštalacij v gospodinjstvu in podobnih inštalacij, ki jih bodo uporabljale nepoučene osebe, so zajete v skupini standardov IEC 60898.
Zahteve za odklopnike za opremo (npr. za električne aparate) so zajete v standardu IEC 60934.
Za določene vrste uporabe (npr. vleka, valjarne, storitve v marinah, za pogonom s spremenljivo frekvenco, uporaba v eksplozivnih atmosferah) lahko veljajo posebne ali dodatne zahteve.
OPOMBA 1: Odklopniki imajo lahko namenski pribor.
OPOMBA 2: Odklopniki, obravnavani v tem dokumentu, imajo lahko naprave za avtomatsko odpiranje pri vnaprej določenih pogojih, ki so drugačni od tistih za prenapetost in podnapetost, kot je sprememba moči ali toka. Ta dokument ne obravnava preverjanja delovanja v takih vnaprej določenih pogojih.
Cilj tega dokumenta je navesti:
a) značilnosti odklopnikov;
b) zahteve za odklopnike v zvezi z naslednjim:
1) delovanje in obnašanje pri običajnih pogojih;
2) delovanje in obnašanje pri preobremenitvi, delovanje in obnašanje v primeru kratkega stika, vključno s koordinacijo delovanja (selektivnost in varnostna zaščita) ter delovanje in obnašanje v primeru napake ozemljitve;
3) dielektrične lastnosti;
4) zahteve glede elektromagnetne združljivosti, kadar je ustrezno;
c) preskusi, katerih cilj je potrditi, da so bili ti pogoji in metode izvajanja teh preskusov izpolnjeni;
d) podatki, ki jih je treba označiti na odklopnikih ali jih priložiti odklopnikom.
OPOMBA 3: Za zahteve glede kibernetske varnosti glej standard IEC TS 63208.
General Information
Relations
Overview - EN IEC 60947-2:2025 (Low-voltage switchgear - Circuit-breakers)
EN IEC 60947-2:2025 (identical to IEC 60947-2:2024, Edition 6) is the updated European/CENELEC standard for low-voltage circuit-breakers. It applies to circuit-breakers intended to be installed and operated by instructed or skilled persons, with main contact rated voltages up to 1 000 V AC or 1 500 V DC. The sixth edition replaces the 2016 edition (and Amendment 1:2019) and constitutes a technical revision that adds and tightens requirements for performance, testing and safety - including integrally fused circuit-breakers and devices with mixed AC ratings.
Key Topics and Technical Requirements
- Scope and ratings: Covers rated voltages ≤ 1 000 V AC and ≤ 1 500 V DC; includes devices that also have ratings above 1 000 V AC but not exceeding 1 500 V AC.
- Construction and safety: Requirements for operator safety, clearances/creepage, isolation and withdrawable designs.
- Releases and settings: Rules for overcurrent releases, including remote/current adjustability and tripping-time settings.
- Short-circuit capability: Tests and criteria for rated service and ultimate short‑circuit breaking capacity, short‑time withstand and individual pole breaking capacity under phase-to-neutral conditions.
- Dielectric and grounding tests: Additional dielectric tests (including in tripped position), use of DC for dielectric testing, and extra tests for ground-fault overcurrent releases.
- EMC and performance measurement: Updated electromagnetic compatibility tests (Annex J) and improved methods for measuring power loss (Annex G).
- Classification changes: Removal of some historical classification schemes and introduction of a new CBI class W (Annex L).
- Coordination: Requirements for integration with other protective devices and for integrally fused circuit-breakers.
Practical Applications - Who Uses EN IEC 60947-2:2025
- Manufacturers of low‑voltage circuit-breakers for design verification, type testing and CE/CENELEC compliance.
- Test laboratories performing type and routine tests (dielectric, breaking capacity, EMC, temperature-rise).
- Panel builders and switchgear OEMs selecting and specifying circuit-breakers for industrial, commercial and infrastructure systems.
- Electrical engineers, consultants and specifiers ensuring correct selection for short‑circuit protection, selectivity and isolation functions.
- Certification and conformity bodies assessing compliance with European and international requirements.
Related Standards
Commonly used with:
- IEC/EN 60947-1 (General rules for low-voltage switchgear and controlgear)
- IEC/EN 60947-3, 60947-4-1 (related LV devices)
- IEC 60664-1 (insulation coordination)
- IEC/EN 61000 series (EMC tests)
- IEC 60269 (fuses) - for coordination and integrally fused devices
EN IEC 60947-2:2025 is essential for anyone involved in the design, testing, procurement or regulatory approval of low‑voltage circuit‑breakers. Keywords: EN IEC 60947-2:2025, IEC 60947-2:2024, low-voltage switchgear, circuit-breakers, integrally fused circuit-breakers, dielectric tests, short-circuit breaking capacity, EMC.
Frequently Asked Questions
SIST EN IEC 60947-2:2025 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2024)". This standard covers: IEC 60947-2:2024 applies to circuit-breakers, intended to be installed and operated by instructed or skilled persons, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC; it also contains additional requirements for integrally fused circuit-breakers. This document also applies to circuit-breakers with ratings at or below 1 000 V AC, additionally having one or more ratings above 1 000 V AC but not exceeding 1 500 V AC. This sixth edition cancels and replaces the fifth edition published in 2016 and its Amendment 1: 2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) suitability for isolation (see Clause 1); b) removal of the classification according to the interrupting medium, according to the design, according to the suitability for isolation (see Clause 4); c) adjustment of current settings with an external device connectable to the release (see 5.7.3); d) requirements for circuits with protective separation (see 8.2.3.8); e) additional tests for ground-fault overcurrent releases (see 9.3.4.2.5); f) additional tests concerning dielectric properties in tripped position (see 9.3.4.3); g) use of DC voltage for dielectric tests (see 9.3.4.6.2 and 9.4.6); h) tests of individual pole breaking capacity under phase-to-neutral AC voltage (see 9.3.11); i) improvement of measurement of power loss in Annex G; j) changes in EMC tests (see Annex J); k) introduction of CBI class W in Annex L.
IEC 60947-2:2024 applies to circuit-breakers, intended to be installed and operated by instructed or skilled persons, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC; it also contains additional requirements for integrally fused circuit-breakers. This document also applies to circuit-breakers with ratings at or below 1 000 V AC, additionally having one or more ratings above 1 000 V AC but not exceeding 1 500 V AC. This sixth edition cancels and replaces the fifth edition published in 2016 and its Amendment 1: 2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) suitability for isolation (see Clause 1); b) removal of the classification according to the interrupting medium, according to the design, according to the suitability for isolation (see Clause 4); c) adjustment of current settings with an external device connectable to the release (see 5.7.3); d) requirements for circuits with protective separation (see 8.2.3.8); e) additional tests for ground-fault overcurrent releases (see 9.3.4.2.5); f) additional tests concerning dielectric properties in tripped position (see 9.3.4.3); g) use of DC voltage for dielectric tests (see 9.3.4.6.2 and 9.4.6); h) tests of individual pole breaking capacity under phase-to-neutral AC voltage (see 9.3.11); i) improvement of measurement of power loss in Annex G; j) changes in EMC tests (see Annex J); k) introduction of CBI class W in Annex L.
SIST EN IEC 60947-2:2025 is classified under the following ICS (International Classification for Standards) categories: 29.130.20 - Low voltage switchgear and controlgear. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 60947-2:2025 has the following relationships with other standards: It is inter standard links to SIST EN 60947-2:2017/A1:2020, SIST EN 60947-2:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN IEC 60947-2:2025 is associated with the following European legislation: EU Directives/Regulations: 2014/30/EU, 2014/35/EU; Standardization Mandates: M/511, M/552. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase SIST EN IEC 60947-2:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2025
Nizkonapetostne stikalne in krmilne naprave - 2. del: Odklopniki (IEC 60947-
2:2024)
Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2024)
Niederspannungsschaltgeräte - Teil 2: Leistungsschalter (IEC 60947-2:2024)
Appareillage à basse tension - Partie 2: Disjoncteurs (IEC 60947-2:2024)
Ta slovenski standard je istoveten z: EN IEC 60947-2:2025
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60947-2
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2025
ICS 29.130.20 Supersedes EN 60947-2:2017; EN 60947-2:2017/A1:2020
English Version
Low-voltage switchgear and controlgear - Part 2: Circuit-
breakers
(IEC 60947-2:2024)
Appareillage à basse tension - Partie 2: Disjoncteurs Niederspannungsschaltgeräte - Teil 2: Leistungsschalter
(IEC 60947-2:2024) (IEC 60947-2:2024)
This European Standard was approved by CENELEC on 2024-10-16. 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 60947-2:2025 E
European foreword
The text of document 121A/608/FDIS, future edition 6 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
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-02-28
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-02-29
document have to be withdrawn
This document supersedes EN 60947-2:2017 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 60947-2:2024 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 standard indicated:
IEC 60051 series NOTE Approved as EN IEC 60051 series
IEC 60112 NOTE Approved as EN IEC 60112
IEC 60269-1:2006 NOTE Approved as EN 60269-1:2007 (not modified)
IEC 60269-1:2006/A1:2009 NOTE Approved as EN 60269-1:2007/A1:2009 (not modified)
IEC 60269-1:2006/A2:2014 NOTE Approved as EN 60269-1:2007/A2:2014 (not modified)
IEC 60335-1:2020 NOTE Approved as EN IEC 60335-1:2023 (not modified) +A11:2023
IEC 60364 series NOTE Approved as HD 60364 series
IEC 60364-5-52 NOTE Approved as HD 60364-5-52
IEC 60695-2-11:2021 NOTE Approved as EN IEC 60695-2-11:2021 (not modified)
IEC 60898 series NOTE Approved as EN 60898 series
IEC 60898-1 NOTE Approved as EN 60898-1
IEC 60934 NOTE Approved as EN IEC 60934
IEC 60947-3 NOTE Approved as EN IEC 60947-3
IEC 60947-5-1 NOTE Approved as EN 60947-5-1
IEC 61000-3-2 NOTE Approved as EN IEC 61000-3-2
IEC 61000-3-3 NOTE Approved as EN 61000-3-3
IEC 61000-4-13 NOTE Approved as EN 61000-4-13
IEC 61008-1:2010 NOTE Approved as EN 61008-1:2012 +A11:2015
IEC 61008-1:2010/A1:2012 NOTE Approved as EN 61008-1:2012/A1:2014
IEC 61008-1:2010/A2:2013 NOTE Approved as EN 61008-1:2012/A2:2014
IEC 61009-1:2010 NOTE Approved as EN 61009-1:2012 +A11:2015
IEC 61009-1:2010/A1:2012 NOTE Approved as EN 61009-1:2012/A1:2014
IEC 61009-1:2010/A2:2013 NOTE Approved as EN 61009-1:2012/A2:2014
IEC 61131-1:2003 NOTE Approved as EN 61131-1:2003 (not modified)
IEC 61238-1 series NOTE Approved as EN IEC 61238-1 series
IEC 61439 series NOTE Approved as EN IEC 61439 series
IEC/TR 63201 NOTE Approved as CLC IEC/TR 63201
IEC/TR 63216:2019 NOTE Approved as CLC IEC/TR 63216:2020 (not modified)
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 60068-2-14 - Environmental testing - Part 2-14: Tests - EN IEC 60068-2-14 -
Test N: Change of temperature
IEC 60068-2-30 - Environmental testing - Part 2-30: Tests - EN 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60228 - Conductors of insulated cables EN IEC 60228 -
IEC 60664-1 2020 Insulation coordination for equipment EN IEC 60664-1 2020
within low-voltage supply systems - Part 1:
Principles, requirements and tests
- - +AC 2020
IEC 60947-1 2020 Low-voltage switchgear and controlgear - EN IEC 60947-1 2021
Part 1: General rules
IEC 60947-4-1 - Low-voltage switchgear and controlgear - EN IEC 60947-4-1 -
Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-
starters
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - Part EN 61000-4-2 2009
4-2: Testing and measurement techniques
- Electrostatic discharge immunity test
IEC 61000-4-3 2020 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-3 2020
4-3 : Testing and measurement techniques
- Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - Part EN 61000-4-4 2012
4-4: Testing and measurement techniques
- Electrical fast transient/burst immunity
test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - Part EN 61000-4-5 2014
4-5: Testing and measurement techniques
- Surge immunity test
+ A1 2017 + A1 2017
Publication Year Title EN/HD Year
IEC 61000-4-6 2023 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-6 2023
4-6: Testing and measurement techniques
- Immunity to conducted disturbances,
induced by radio-frequency fields
IEC 61000-4-11 2020 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-11 2020
4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current up to 16 A per phase
- - +AC 2020
- - +AC 2022
IEC 61140 2016 Protection against electric shock - EN 61140 2016
Common aspects for installation and
equipment
IEC 61545 1996 Connecting devices - Devices for the - -
connection of aluminium conductors in
clamping units of any material and copper
conductors in aluminium bodied clamping
units
IEC 62475 2010 High-current test techniques - Definitions EN 62475 2010
and requirements for test currents and
measuring systems
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment EN 55011 2016
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
+ A1 2016 + A1 2017
- - + A11 2020
+ A2 2019 + A2 2021
CISPR 32 2015 Electromagnetic compatibility of multimedia EN 55032 2015
equipment - Emission requirements
- - +AC 2016
- - +A11 2020
IEC 60947-2 ®
Edition 6.0 2024-09
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 978-2-8322-9521-2
– 2 – IEC 60947-2:2024 © IEC 2024
CONTENTS
FOREWORD . 15
1 Scope . 17
2 Normative references . 18
3 Terms and definitions . 19
4 Classification . 23
4.1 According to the selectivity category, A or B (see 5.4). 23
4.2 According to the method of controlling the operating mechanism: . 23
4.3 According to the provision for maintenance: . 23
4.4 According to the method of installation:. 23
4.5 According to the degree of protection provided by the enclosure (see 8.1.12
of IEC 60947‑1:2020) . 23
5 Characteristics of circuit-breakers. 23
5.1 Summary of characteristics . 23
5.2 Type of circuit-breaker . 23
5.3 Rated and limiting values of the main circuit . 23
5.3.1 General . 23
5.3.2 Rated voltages . 24
5.3.3 Currents . 24
5.3.4 Rated frequency . 24
5.3.5 Rated duty . 24
5.3.6 Short-circuit characteristics . 25
5.4 Selectivity categories . 27
5.5 Control circuits . 27
5.5.1 Electrical control circuits . 27
5.5.2 Air-supply control circuits (pneumatic or electro-pneumatic) . 28
5.6 Auxiliary circuits . 28
5.7 Releases. 28
5.7.1 Types . 28
5.7.2 Characteristics. 28
5.7.3 Current setting of overcurrent releases . 29
5.7.4 Tripping time setting of overcurrent releases . 29
5.8 Integral fuses (integrally fused circuit-breakers) . 30
6 Product information . 30
6.1 Nature of the information . 30
6.2 Marking . 30
6.3 Instructions for installation, operation and maintenance . 32
7 Normal service, mounting and transport conditions . 32
8 Constructional and performance requirements . 32
8.1 Constructional requirements . 32
8.1.1 General . 32
8.1.2 Withdrawable circuit-breakers . 33
8.1.3 Isolation . 33
8.1.4 Clearances and creepage distances . 33
8.1.5 Requirements for the safety of the operator . 33
8.1.6 List of construction breaks . 33
8.1.7 Additional requirements for circuit-breakers provided with a neutral pole . 34
IEC 60947-2:2024 © IEC 2024 – 3 –
8.1.8 Digital inputs and outputs for use with programmable logic controllers
(PLCs) . 34
8.2 Performance requirements . 34
8.2.1 Operating conditions . 34
8.2.2 Temperature-rise . 37
8.2.3 Dielectric properties . 38
8.2.4 Ability to make and break under no load, normal load and overload
conditions . 39
8.2.5 Ability to make and break under short-circuit conditions . 40
8.2.6 Requirements for isolation . 40
8.2.7 Specific requirements for integrally fused circuit-breakers . 40
8.2.8 Coordination between a circuit-breaker and another short-circuit
protective device . 41
8.3 Electromagnetic compatibility (EMC) . 41
9 Tests . 41
9.1 Kind of tests . 41
9.1.1 General . 41
9.1.2 Type tests . 41
9.1.3 Routine tests . 41
9.1.4 Special tests . 41
9.2 Compliance with constructional requirements . 42
9.3 Type tests . 42
9.3.1 General . 42
9.3.2 Test sequences . 43
9.3.3 General test conditions . 50
9.3.4 Test sequence I: General performance characteristics . 58
9.3.5 Test sequence II: Rated service short-circuit breaking capacity . 68
9.3.6 Test sequence III: Rated ultimate short-circuit breaking capacity . 69
9.3.7 Test sequence IV: Rated short-time withstand current . 71
9.3.8 Test sequence V: Performance of integrally fused circuit-breakers . 72
9.3.9 Test sequence VI: Combined test sequence . 74
9.3.10 Test sequence VII: Critical DC load current . 76
9.3.11 Test sequence VIII: Rated individual pole ultimate short-circuit breaking
capacity at phase-to-neutral AC voltage. 77
9.4 Routine tests. 78
9.4.1 General . 78
9.4.2 Mechanical operation tests . 78
9.4.3 Verification of the calibration of overcurrent releases . 79
9.4.4 Verification of the operation of undervoltage and shunt releases . 79
9.4.5 Additional tests for CBRs . 80
9.4.6 Dielectric tests . 80
9.4.7 Test for the verification of clearances less than those corresponding to
case A of Table 13 of IEC 60947-1:2020 . 81
9.5 Special tests – Damp heat, salt mist, vibration and shock . 81
Annex A (normative) Coordination between a circuit-breaker and another short-circuit
protective device associated in the same circuit . 84
A.1 General . 84
A.2 Object . 84
A.3 General requirements for the co-ordination of a circuit-breaker with another
SCPD . 84
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A.4 Type and characteristics of the associated SCPD . 84
A.5 Verification of selectivity . 84
A.6 Verification of back-up protection . 84
Annex B (normative) Circuit-breakers incorporating residual current protection (CBRs) . 86
B.1 General . 86
B.1.1 Preamble . 86
B.1.2 Object . 86
B.2 Terms and definitions . 87
B.2.1 Terms and definitions relating to currents flowing from live parts to
earth . 87
B.2.2 Terms and definitions relating to the energization of a CBR . 87
B.2.3 Terms and definitions relating to the operation and the functions of a
CBR . 88
B.2.4 Terms and definitions relating to values and ranges of energizing
quantities . 89
B.3 Classification . 90
B.3.1 Classification according to the method of operation of the residual
current function . 90
B.3.2 Classification according to the possibility of adjusting the residual
operating current . 90
B.3.3 Classification according to time delay of the residual current function . 90
B.3.4 Classification according to behaviour in presence of a DC component . 90
B.4 Characteristics of CBRs concerning their residual current function . 90
B.4.1 Rated values . 90
B.4.2 Preferred and limiting values . 91
B.4.3 Value of the rated residual short-circuit making and breaking capacity
(I ) . 92
Δm
B.4.4 Operating characteristics in the case of an earth fault current in the
presence or absence of a DC component . 92
B.5 Marking . 93
B.6 Normal service, mounting and transport conditions . 95
B.7 Design and operating requirements . 95
B.7.1 Design requirements . 95
B.7.2 Operating requirements . 95
B.7.3 Electromagnetic compatibility . 99
B.8 Tests . 99
B.8.1 Test sequences . 99
B.8.2 Verification of the operating characteristics . 102
B.8.3 Verification of dielectric properties . 104
B.8.4 Verification of the operation of the test device at the limits of rated
voltage . 104
B.8.5 Verification of the limiting value of the non-operating current under
overcurrent conditions . 105
B.8.6 Verification of the resistance against unwanted tripping due to surge
currents resulting from impulse voltages . 105
B.8.7 Additional verifications for CBRs of types A and B . 106
B.8.8 Additional verifications for CBRs of type B . 108
B.8.9 Verification of the behaviour of CBRs functionally dependent on line
voltage classified under B.3.1.2.1 . 113
B.8.10 Verification of the behaviour of CBRs functionally dependent on line
voltage classified under B.3.1.2.2 . 113
IEC 60947-2:2024 © IEC 2024 – 5 –
B.8.11 Verification of the residual short-circuit making and breaking capacity . 114
B.8.12 Verification of the effects of environmental conditions . 115
B.8.13 Verification of electromagnetic compatibility . 116
B.8.14 Test for variations or interruptions of voltage and for voltage dips. 118
Annex C (normative) Individual pole short-circuit test sequence . 130
C.1 General . 130
C.2 Test of individual pole short-circuit breaking capacity . 130
C.3 Verification of dielectric withstand and leakage current . 130
C.4 Verification of overload releases . 130
Annex D (normative) Additional requirements for circuit-breakers intended for
connection of aluminium conductors . 131
D.1 General . 131
D.2 Terms and definitions . 131
D.3 Classification . 132
D.4 Characteristics . 132
D.5 Product information . 132
D.5.1 Nature of information . 132
D.5.2 Marking . 132
D.5.3 Instructions for installation, operation and maintenance . 132
D.6 Normal service, mounting and transport conditions . 132
D.7 Constructional and performance requirements . 133
D.8 Tests . 133
D.8.1 General . 133
D.8.2 Current cycling test. 134
D.8.3 Climatic test. 138
D.8.4 Mechanical properties of terminals . 139
D.8.5 Test for insertability of unprepared round aluminium conductors having
the maximum cross-section . 139
Annex E (informative) Items subject to agreement between manufacturer and user . 143
Annex F (normative) Additional tests for circuit-breakers with electronic overcurrent
protection . 144
F.1 General . 144
F.2 List of tests . 144
F.2.1 General . 144
F.2.2 Electromagnetic compatibility (EMC) tests . 144
F.2.3 Suitability for multiple frequencies . 145
F.2.4 Dry heat test . 145
F.2.5 Damp heat test . 145
F.2.6 Temperature variation cycles at a specified rate of change . 145
F.3 General test conditions . 145
F.3.1 General . 145
F.3.2 Electromagnetic compatibility tests . 145
F.4 Immunity tests . 146
F.4.1 Harmonic currents . 146
F.4.2 Electrostatic discharges . 147
F.4.3 Radiated RF electromagnetic fields . 147
F.4.4 Electrical fast transient/burst (EFT/B) . 148
F.4.5 Surges . 148
F.4.6 Conducted disturbances induced by RF fields (common mode) . 148
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F.4.7 Current dips . 149
F.5 Emission tests . 149
F.5.1 Harmonics . 149
F.5.2 Voltage fluctuations . 149
F.5.3 Conducted RF disturbances (150 kHz to 30 MHz) . 150
F.5.4 Radiated RF disturbances (30 MHz to 6 000 MHz) . 150
F.6 Suitability for multiple frequencies . 150
F.6.1 General . 150
F.6.2 Test conditions . 150
F.6.3 Test procedure . 150
F.6.4 Test results. 151
F.7 Dry heat test . 151
F.7.1 Test procedure . 151
F.7.2 Test results. 151
F.7.3 Verification of overload releases . 151
F.8 Damp heat test . 151
F.8.1 Test procedure . 151
F.8.2 Verification of overload releases . 152
F.9 Temperature variation cycles at a specified rate of change . 152
F.9.1 Test conditions . 152
F.9.2 Test procedure . 152
F.9.3 Test results. 152
F.9.4 Verification of overload releases . 152
Annex G (normative) Power loss . 167
G.1 General . 167
G.2 Determination method . 167
G.2.1 AC circuit-breakers of rated current exceeding 400 A . 167
G.2.2 AC circuit-breakers of rated current not exceeding 400 A . 168
G.2.3 DC circuit-breakers . 168
G.3 Test conditions . 168
G.4 Test method . 169
G.4.1 General . 169
G.4.2 Voltage drop measurements . 169
G.4.3 Current measurement . 169
Annex H (normative) Test sequence for circuit-breakers for IT systems . 172
H.1 General . 172
H.2 Individual pole short-circuit . 172
H.3 Verification of dielectric withstand and leakage current . 173
H.4 Verification of overload releases . 173
H.5 Marking . 173
Annex I Vacant . 174
Annex J (normative) Electromagnetic compatibility (EMC) – Requirements and test
methods for circuit-breakers. 175
J.1 General . 175
J.2 Immunity . 176
J.2.1 General . 176
J.2.2 Electrostatic discharges . 178
J.2.3 Radiated RF electromagnetic fields . 179
J.2.4 Electrical fast transients/bursts (EFT/B) . 179
IEC 60947-2:2024 © IEC 2024 – 7 –
J.2.5 Surges . 179
J.2.6 Conducted disturbances induced by RF fields (common mode) . 180
J.3 Emission . 180
J.3.1 General . 180
J.3.2 Conducted RF disturbances (150 kHz to 30 MHz) . 181
J.3.3 Radiated RF disturbances (30 MHz to 6 000 MHz) . 181
Annex K (informative) Glossary of symbols and graphical representation of
characteristics . 187
Annex L (normative) Circuit-breakers not fulfilling the requirements for overcurrent
protection (CBIs) . 196
L.1 General . 196
L.2 Terms and definitions . 196
L.3 Classification . 196
L.4 Characteristics . 197
L.4.1 Rated current (I ) . 197
n
L.4.2 Rated conditional short-circuit current (I ) . 197
cc
L.4.3 Other characteristics . 197
L.5 Product information . 197
L.6 Constructional and performance requirements . 198
L.7 Tests . 198
L.7.1 General . 198
L.7.2 Rated conditional short-circuit current tests . 200
L.7.3 Routine tests . 202
Annex M (normative) Modular residual current devices (without integral current
breaking device) . 203
M.1 General . 203
M.1.1 Preamble . 203
M.1.2 Object . 203
M.2 Terms and definitions . 203
M.2.1 Terms and definitions relating to the energization of an MRCD . 203
M.2.2 Terms and definitions relating to the operation and the functions of an
MRCD. 204
M.3 Classification . 204
M.3.1 Classification according to the configuration of the primary conductors . 204
M.3.2 Classification according to the method of operation . 204
M.3.3 Classification according to the possibility of adjusting the residual
operating current . 205
M.3.4 Classification according to time delay of the residual current function . 205
M.3.5 Classification according to behaviour in presence of a DC component . 205
M.4 Characteristics of MRCDs . 205
M.4.1 General characteristics . 205
M.4.2 Characteristics of MRCDs concerning their residual current function . 206
M.4.3 Behaviour under short-circuit conditions . 206
M.4.4 Preferred and limiting values . 207
M.5 Product information . 207
M.6 Normal service, mounting and transport conditions . 209
M.7 Design and operating requirements . 209
M.7.1 Design requirements . 209
M.7.2 Operating requirements . 209
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M.8 Tests . 212
M.8.1 General . 212
M.8.2 Compliance with constructional requirements . 213
M.8.3 Verification of the operating characteristics .
...
SIST EN IEC 60947-2:2025는 저전압 차단기 및 제어 장치의 표준으로, 차단기의 설계 및 운영에 대한 중요한 지침을 제공합니다. 이 표준의 범위는 1,000V AC 또는 1,500V DC를 초과하지 않는 회로에 연결될 수 있는 차단기로, 교육받은 전문가에 의해 설치되고 운영되는 장치에 적합합니다. 특히, 이 문서는 통합 퓨즈 차단기에 대한 추가 요구 사항도 포함하고 있습니다. SIST EN IEC 60947-2:2025의 강점 중 하나는 전반적인 기술 개선을 위한 포괄적인 수정이 포함되어 있다는 점입니다. 이전 버전인 2016년 개정판의 오류를 교정하고 기술 검토를 통하여, 사용자에게 필요한 모든 최신 정보를 제공합니다. 예를 들어, 고립 적합성에 대한 명확한 규정을 포함하여 회로의 보호 분리에 대한 요구 사항을 명시함으로써 안전성을 강화하고 있습니다. 또한, 현재 버전에서는 차단기의 성능을 평가하는 데 필수적인 각종 시험이 추가되었습니다. 이는 차단기가 고장 상태에서도 최소한의 성능을 발휘할 수 있도록 돕는 데 중요한 요소입니다. 예를 들어, 지락 과전류 릴리즈 및 유전 특성과 관련된 추가 시험 요구 사항은 신뢰성과 안전성을 높이는 데 크게 기여합니다. SIST EN IEC 60947-2:2025는 저전압 차단기를 포함하는 다양한 애플리케이션에서 필수적인 표준으로, 전기 장비의 안전성과 효율성을 극대화할 수 있는 기초를 제공합니다. 전자기 호환성(EMC) 시험의 변경이나 단상 중성 전압 하에서 개별 극의 차단 용량 시험을 요구함으로써, 다양한 전기 환경에서도 안정적으로 사용할 수 있는지를 보장합니다. 종합적으로, SIST EN IEC 60947-2:2025 표준은 저전압 차단기의 설계 및 사용을 위한 중요한 지침서로, 현대의 전기 시스템에서 필요한 안전성과 신뢰성을 제공하는 데 결정적인 역할을 하고 있습니다.
SIST EN IEC 60947-2:2025は、低電圧遮断器および制御機器の重要な標準であり、特に回路遮断器に焦点を当てています。この標準は、最大1,000V ACまたは1,500V DCを超えない回路に接続されることを意図した回路遮断器に適用され、指導を受けたか熟練した人々によって設置および操作されることが求められています。この文書には、統合型ヒューズ付き回路遮断器に対する追加要件も含まれています。 この版は、2016年に発行された前版を取り消し、技術的改訂を含むもので、標準の適用範囲を明確に定義しています。特に注目すべきは、隔離の適合性に関する規定の追加や、回路の保護分離に関する要件、動作時の誘導特性に関する新しい試験、直流電圧を用いた絶縁試験に関する改良など、技術的な改訂が行われている点です。特に、回路遮断器が1,000V AC以下の定格を持ちながら、1,000V ACを超えない定格も有する場合の追加的なガイダンスは、設計者やエンジニアに大きな便益をもたらします。 さらに、最新のカスタマイズ可能な外部デバイスを接続可能とし、電流設定の調整が容易になったことは、運用の柔軟性を一層高めています。EMC試験や、個々の極のブレーカ容量試験に関する改良も、装置の信頼性を向上させ、より安全な運用を実現するための重要な要素として挙げられます。 この標準の第6版は、回路遮断器の設計および使用における現代の要求に対する重要な応答であり、特に技術者や現場の専門家にとって、より高い安全基準を確保しながら運用するための不可欠なガイドラインとなります。標準化文書の最新化は、業界の発展において重要な役割を果たし、全体としての電力システムの効率化と信頼性向上に寄与します。
The SIST EN IEC 60947-2:2025 standard presents a comprehensive framework for low-voltage switchgear and controlgear, specifically focusing on circuit-breakers. This standard is essential for ensuring the safety and reliability of circuit-breakers that are designed to be operated by instructed or skilled personnel, with an operational voltage not exceeding 1,000 V AC or 1,500 V DC. Its relevance is particularly significant for modern electrical installations, where adherence to stringent safety norms is paramount. One of the noteworthy strengths of this standard is its technical revision nature, which reflects the continuous advancements in electrical technology. The sixth edition introduces several crucial technical changes that enhance the performance and safety features of circuit-breakers. For instance, the inclusion of suitability for isolation (Clause 1) and the removal of classification based on interrupting medium and design help streamline the implementation and understanding of these devices. This simplification is advantageous for both manufacturers and end-users, allowing for clearer compliance with safety requirements. Further, the requirement adjustments for current settings with an external device connected to the release (5.7.3) indicate an increased focus on user flexibility and adaptability, which aligns with contemporary practices in electrical engineering. Additionally, the new additional tests for ground-fault overcurrent releases (9.3.4.2.5) and concerning dielectric properties in the tripped position (9.3.4.3) enhance the reliability of circuit-breakers, providing a robust mechanism to ensure operational integrity under fault conditions. The introduction of DC voltage for dielectric tests (9.3.4.6.2 and 9.4.6) is particularly important as it addresses the growing prevalence of direct current applications, ensuring that the standard is relevant for emerging technologies. Furthermore, the emphasis on the individual pole's breaking capacity under phase-to-neutral AC voltage (9.3.11) underscores the standard’s commitment to operational safety across diverse configurations. The enhancements to measurement techniques of power loss (Annex G) and modifications in EMC tests (Annex J) demonstrate a commitment to operational efficiency and interference mitigation, which are critical in complex electrical systems. Additionally, the introduction of the CBI class W in Annex L provides more granularity in the classification of circuit-breakers, tailoring the standard to meet specialized industry needs. In summary, SIST EN IEC 60947-2:2025 stands out for its comprehensive approach to circuit-breaker standards while incorporating significant technical revisions that reflect current industry practices and requirements. Its focus on safety, reliability, and adaptability ensures that it remains a crucial document for professionals in the electrical field.
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