Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies

IEC 61439-2:2020 defines the specific requirements for the power switchgear and controlgear assembly (abbreviated "PSC-assembly" throughout this document see 3.1.101) as follows:
- assemblies for which the rated voltage does not exceed 1 000 V AC or 1 500 V DC;
- assemblies designed for a nominal frequency of the incoming supply or supplies not exceeding 1 000 Hz;
NOTE 1 Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007, 5.3.3.2.5 to take into account additional constraints to insulation coordination.
- assemblies intended for indoor and outdoor applications;
- stationary or movable assemblies with or without enclosures;
- assemblies intended for use in connection with the generation, transmission, distribution and conversion of electrical energy, and for the control of equipment consuming electrical energy and for associated data processing;
- assemblies designed for use under special service conditions, for example in ships and in rail vehicles, provided that the other relevant specific requirements are complied with;
NOTE 2 Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.
This third edition cancels and replaces the second edition published in 2011. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;
b) clarification of the requirements for forms of internal separation and the addition of the requirement, when the form of separation is higher than 1, all parts within the functional unit compartment that remain live when the functional unit is switched off shall be protected to at least IPXXB;
c) alignment with the structure of IEC 61439-1:2020;
d) addition of temperature-rise verification for; (i) temperature-rise verification of assemblies with natural cooling and circuits rated above 1 600 A by a combination of comparison with a reference design and calculation, and; (ii) temperature-rise verification of assemblies with active cooling and rated currents up to 1 600 A;
e) consideration of IP with active cooling.

Ensemble d'appareillage à basse tension - Partie 2 : Ensembles d’appareillage de puissance

L’IEC 61439:2020 définit les exigences spécifiques applicables aux ensembles d’appareillage de puissance (dans l’ensemble du présent document, l’abréviation "ensemble EAP" est utilisée pour désigner un ensemble d’appareillage de puissance; voir 3.1.101) comme suit:
ensembles dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu;
ensembles conçus pour une fréquence nominale de l’alimentation ou des alimentations entrantes ne dépassant pas 1 000 Hz;  NOTE 1 Les fréquences supérieures à 1 kHz sont considérées comme des hautes fréquences, voir aussi l’IEC 60664-1:2007, 5.3.3.2.5 pour tenir compte des contraintes supplémentaires relatives à la coordination de l’isolement.
ensembles destinés à des applications d’intérieur et d’extérieur;
ensembles fixes ou mobiles, avec ou sans enveloppe;
ensembles destinés à être utilisés avec des équipements conçus pour la production, le transport, la distribution et la conversion de l’énergie électrique, ainsi que pour la commande des matériels consommant de l’énergie électrique et le traitement des données associées;
ensembles conçus pour être utilisés dans des conditions spéciales d’emploi, par exemple à bord de navires et de véhicules sur rails, à condition que les autres exigences spécifiques correspondantes soient respectées.  NOTE 2 Les exigences supplémentaires pour les ensembles à bord des navires sont couvertes par l’IEC 60092-302-2.
Cette troisième édition annule et remplace la deuxième édition parue en 2011 dont elle constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  
ajout des Annexes DD, EE et FF pour les ensembles utilisables dans les installations photovoltaïques;
clarification des exigences concernant les formes de séparation interne et ajout de l’exigence selon laquelle, lorsque la forme de séparation de numéro supérieur à 1, toutes les parties à l’intérieur du compartiment de l’unité fonctionnelle qui restent actives lorsque l’unité fonctionnelle est désactivée doivent être protégées au moins selon le degré de protection IPXXB;
alignement sur la structure de l’IEC 61439-1:2020;
ajout de la vérification de l’échauffement pour (i) la vérification de l’échauffement des ensembles à ventilation naturelle et des circuits de courant assigné supérieur à 1 600 A par une combinaison de comparaison entre une conception de référence et le calcul, et (ii) la vérification de l’échauffement des ensembles à ventilation forcée et avec des courants assignés jusqu’à 1 600 A;
prise en compte du degré de protection IP pour la ventilation forcée.

General Information

Status
Published
Publication Date
21-Jul-2020
Current Stage
PPUB - Publication issued
Start Date
31-Jul-2020
Completion Date
22-Jul-2020
Ref Project

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IEC 61439-2 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear assemblies –
Part 2: Power switchgear and controlgear assemblies

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
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3, rue de Varembé info@iec.ch
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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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IEC 61439-2 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear assemblies –

Part 2: Power switchgear and controlgear assemblies

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-8587-9

– 2 – IEC 61439-2:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations . 9
5 Interface characteristics . 9
6 Information . 10
7 Service conditions . 11
8 Constructional requirements . 11
9 Performance requirements . 14
10 Design verification . 15
11 Routine verification . 19
Annexes . 22
Annex AA (informative) Items subject to agreement between the PSC-assembly
manufacturer and the user . 23
Annex BB (informative) Forms of internal separation (see 8.101) . 27
Annex CC (informative) Determining power loss by measurement for circuits
exceeding 1600 A in a reference design . 32
Annex DD (informative) Assemblies for use in photovoltaic installations . 34
Annex EE (informative) Items subject to agreement between the photovoltaic
assembly (PVA) manufacturer and the user . 43
Annex FF (informative) Design verification (PVA only) . 47
Annex GG (informative) List of notes concerning certain countries . 49
Bibliography . 50

Figure BB.1 – Symbols used in Figures BB.2, BB.3 and BB.4 . 27
Figure BB.2 – Forms 1 and 2 . 29
Figure BB.3 – Form 3 . 30
Figure BB.4 – Form 4 . 31
Figure CC.1 – Power loss measurement . 33
Figure DD.101 – Indicative arrangement of radiant heat lamps for temperature-rise test
with simulated solar radiation . 41

Table 101 – Values of assumed loading . 19
Table 102 – Test voltages across the open contacts of equipment suitable for isolation . 19
Table 103 – Electrical conditions for the different positions of withdrawable parts . 20
Table 104 – Forms of internal separation . 21
Table AA.1 – Items subject to agreement between the PSC-assembly manufacturer
and the user . 23
Table DD.101 – Solar radiation conditions . 38
Table EE.1 – Items subject to agreement between the PVA manufacturer and the user . 43
Table FF.1 – List of design verifications to be performed on PVA . 47

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –

Part 2: Power switchgear and controlgear assemblies

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61439-2 has been prepared by subcommittee 121B: Low-voltage
switchgear and controlgear assemblies, of IEC technical committee 121: Switchgear and
controlgear and their assemblies for low voltage.
This third edition cancels and replaces the second edition published in 2011. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;
b) clarification of the requirements for forms of internal separation and the addition of the
requirement, when the form of separation is higher than 1, all parts within the functional
unit compartment that remain live when the functional unit is switched off shall be
protected to at least IPXXB;
c) alignment with the structure of IEC 61439-1:2020;

– 4 – IEC 61439-2:2020 © IEC 2020
d) addition of temperature-rise verification for; (i) temperature-rise verification of assemblies
with natural cooling and circuits rated above 1 600 A by a combination of comparison with
a reference design and calculation, and; (ii) temperature-rise verification of assemblies
with active cooling and rated currents up to 1 600 A.
e) consideration of IP with active cooling.
The text of this document is based on the following documents:
FDIS Report on voting
121B/104/FDIS 121B/109/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this document, general terms and definitions are defined in Clause 3. Further terms and
definitions specific to Annex DD are given in this annex to facilitate easier reading.
The reader's attention is drawn to the fact that Annex GG lists all the “in-some-country”
clauses on differing practices of a less permanent nature relating to the subject of this
document.
This document is to be read in conjunction with IEC 61439-1:2020. The provisions of the
general rules dealt with in IEC 61439-1 are only applicable to this document insofar as they
are specifically cited. When this document states “addition”, “modification” or “replacement”,
the relevant text in IEC 61439-1 is to be adapted accordingly.
Subclauses that are numbered with a 101 (102, 103, etc.) suffix are additional to the same
subclause in IEC 61439-1.
Tables and figures in this document that are new are numbered starting with 101.
New annexes in this document are lettered AA, BB, etc.
In this document, the term PSC-assembly is defined in 3.1.101.
NOTE Throughout the IEC 61439 series of standards, the term assembly (see 3.1.1 of IEC 61439-1:2020) is used
for a low-voltage switchgear and controlgear assembly.
A list of all parts of the IEC 61439 series, under the general title Low-voltage switchgear and
controlgear assemblies can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,

...


IEC 61439-2 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 2: Power switchgear and controlgear assemblies

Ensembles d’appareillage à basse tension –
Partie 2: Ensembles d’appareillage de puissance

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
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IEC Central Office Tel.: +41 22 919 02 11
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.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

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IEC 61439-2 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –

Part 2: Power switchgear and controlgear assemblies

Ensembles d’appareillage à basse tension –

Partie 2: Ensembles d’appareillage de puissance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-9069-9

– 2 – IEC 61439-2:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations . 9
5 Interface characteristics . 9
6 Information . 10
7 Service conditions . 11
8 Constructional requirements . 11
9 Performance requirements . 14
10 Design verification . 15
11 Routine verification . 19
Annexes . 22
Annex AA (informative) Items subject to agreement between the PSC-assembly
manufacturer and the user . 23
Annex BB (informative) Forms of internal separation (see 8.101) . 27
Annex CC (informative) Determining power loss by measurement for circuits
exceeding 1600 A in a reference design . 32
Annex DD (informative) Assemblies for use in photovoltaic installations . 34
Annex EE (informative) Items subject to agreement between the photovoltaic
assembly (PVA) manufacturer and the user . 43
Annex FF (informative) Design verification (PVA only) . 47
Annex GG (informative) List of notes concerning certain countries . 49
Bibliography . 50

Figure BB.1 – Symbols used in Figures BB.2, BB.3 and BB.4 . 27
Figure BB.2 – Forms 1 and 2 . 29
Figure BB.3 – Form 3 . 30
Figure BB.4 – Form 4 . 31
Figure CC.1 – Power loss measurement . 33
Figure DD.101 – Indicative arrangement of radiant heat lamps for temperature-rise test
with simulated solar radiation . 41

Table 101 – Values of assumed loading . 19
Table 102 – Test voltages across the open contacts of equipment suitable for isolation . 19
Table 103 – Electrical conditions for the different positions of withdrawable parts . 20
Table 104 – Forms of internal separation . 21
Table AA.1 – Items subject to agreement between the PSC-assembly manufacturer
and the user . 23
Table DD.101 – Solar radiation conditions . 38
Table EE.1 – Items subject to agreement between the PVA manufacturer and the user . 43
Table FF.1 – List of design verifications to be performed on PVA . 47

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –

Part 2: Power switchgear and controlgear assemblies

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61439-2 has been prepared by subcommittee 121B: Low-voltage
switchgear and controlgear assemblies, of IEC technical committee 121: Switchgear and
controlgear and their assemblies for low voltage.
This third edition cancels and replaces the second edition published in 2011. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;
b) clarification of
...

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