SIST EN IEC 61439-3:2025

Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO) (IEC 61439-3:2024)

IEC 61439-3:2024 defines the specific requirements for distribution boards intended to be operated by ordinary persons (abbreviated DBO throughout this document, see 3.1.101) as follows:
- assemblies intended to be operated by ordinary persons (e.g. switching operations and replacing fuse-links), e.g. in domestic (household) applications;
- assemblies containing outgoing circuits with protective devices intended to be operated by ordinary persons, complying e.g. with IEC 60898-1, the IEC 61008 series, the IEC 61009 series, IEC 62606, IEC 62423 and IEC 60269-3;
- assemblies for applications where the nominal voltage to earth does not exceed 300 V AC (see Table G.1 of IEC 61439-1:2020);
NOTE The voltage limits for DC applications are under consideration.
- assemblies with a rated current (Inc) of the outgoing circuits not exceeding 125 A and a rated current (InA) not exceeding 250 A;
- 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;
- enclosed, stationary assemblies;
- assemblies for indoor or outdoor use.
This second edition cancels and replaces the first edition published in 2012. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) alignment with the structure of IEC 61439-1:2020;
b) inclusion in the scope of more examples of the type of protection and control devices;
c) deletion of type A and Type B DBOs;
d) addition of a new Annex BB related to DBOs used in a prosumer’s electrical installation (PEI);
e) addition of a new Annex CC related to rated current of a DBO with additional source of supply in parallel/simultaneously with another source that is connected to the DBO e.g. PV.

Niederspannungs-Schaltgerätekombinationen - Teil 3: Installationsverteiler für die Bedienung durch Laien (DBO) (IEC 61439-3:2024)

Ensembles d'appareillage à basse tension - Partie 3: Tableaux de répartition destinés à être utilisés par des personnes ordinaires (DBO) (IEC 61439-3:2024)

L'IEC 61439-3:2024 définit les exigences spécifiques pour les tableaux de répartition destinés à être utilisés par des personnes ordinaires (abrégés DBO dans l'ensemble du présent document, voir 3.1.101) ci-après:
- ensembles destinés à être utilisés par des personnes ordinaires (par exemple, pour manœuvrer des appareils de commande et remplacer des éléments de fusible), par exemple dans des applications domestiques;
- ensembles qui contiennent des circuits de départ avec des dispositifs de protection, destinés à être utilisés par des personnes ordinaires, qui satisfont par exemple à l'IEC 60898-1, à la série IEC 61008, à la série IEC 61009, à l'IEC 62606, à l'IEC 62423 et à l'IEC 60269-3;
- ensembles destinés à des applications pour lesquelles la tension nominale à la terre ne dépasse pas 300 V en courant alternatif (voir Tableau G.1 de l'IEC 61439-1:2020);
NOTE Les limites de tension pour les applications en courant continu sont à l'étude.
- ensembles dans lesquels le courant assigné (Inc) des circuits de départ est inférieur ou égal à 125 A et dont le courant assigné (InA) est inférieur ou égal à 250 A;
- ensembles destinés à être utilisés avec des équipements conçus pour la production, le transport, la distribution et la conversion de l'énergie électrique, la commande des matériels qui consomment de l'énergie électrique et le traitement des données associées;
- ensembles fixes sous enveloppe;
- ensembles pour utilisation en intérieure ou en extérieur.
Cette seconde édition annule et remplace la première édition parue en 2012. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) alignement sur la structure de l'IEC 61439-1:2020;
b) inclusion dans le domaine d'application de plus d'exemples de types de dispositifs de protection et de commande;
c) suppression des DBO de type A et de type B;
d) ajout d'une nouvelle Annexe BB relative aux DBO utilisés dans une installation électrique de prosommateur (PEI);
e) ajout d'une nouvelle Annexe CC relative au courant assigné d'un DBO avec une source d'alimentation supplémentaire parallèlement/simultanément avec une autre source reliée au DBO, par exemple un panneau photovoltaïque (PV).

Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 3. del: Električni razdelilniki, s katerimi lahko ravnajo nestrokovnjaki (DBO) (IEC 61439-3:2024)

General Information

• Status: Published
• Public Enquiry End Date: 06-Oct-2022
• Publication Date: 08-Dec-2024
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-Nov-2024
• Due Date: 01-Feb-2025
• Completion Date: 09-Dec-2024
• Directive: 2014/30/EU - 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 (recast)
• Directive: 2014/35/EU - Directive 2014/35/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 the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request 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
• Ref Project: EN IEC 61439-3:2024 - Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO)

Relations

• Revised: SIST EN 61439-3:2012/AC:2019 - Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO) (IEC 61439-3:2012/COR2:2019)
• Effective Date: 08-Feb-2022
• Revised: SIST EN 61439-3:2012 - Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO) (IEC 61439-3:2012)
• Effective Date: 08-Feb-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2025
Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 3. del: Električni
razdelilniki, s katerimi lahko ravnajo nestrokovnjaki (DBO) (IEC 61439-3:2024)
Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards
intended to be operated by ordinary persons (DBO) (IEC 61439-3:2024)
Niederspannungs-Schaltgerätekombinationen - Teil 3: Installationsverteiler für die
Bedienung durch Laien (DBO) (IEC 61439-3:2024)
Ensembles d'appareillage à basse tension - Partie 3: Tableaux de répartition destinés à
être utilisés par des personnes ordinaires (DBO) (IEC 61439-3:2024)
Ta slovenski standard je istoveten z: EN IEC 61439-3:2024
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 61439-3

NORME EUROPÉENNE
EUROPÄISCHE NORM November 2024
ICS 29.130.20 Supersedes EN 61439-3:2012;
EN 61439-3:2012/AC:2019-04
English Version
Low-voltage switchgear and controlgear assemblies - Part 3:
Distribution boards intended to be operated by ordinary persons
(DBO)
(IEC 61439-3:2024)
Ensembles d'appareillage à basse tension - Partie 3: Niederspannungs-Schaltgerätekombinationen - Teil 3:
Tableaux de répartition destinés à être utilisés par des Installationsverteiler für die Bedienung durch Laien (DBO)
personnes ordinaires (DBO) (IEC 61439-3:2024)
(IEC 61439-3:2024)
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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61439-3:2024 E

European foreword
The text of document 121B/193/FDIS, future edition 2 of IEC 61439-3, prepared by SC 121B "Low-
voltage switchgear and controlgear assemblies" 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 IEC 61439-3:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-11-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-11-30
document have to be withdrawn
This document supersedes EN 61439-3:2012 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 61439-3:2024 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 60664-1:2020 NOTE Approved as EN IEC 60664-1:2020 (not modified)
IEC 60670-24 NOTE Approved as EN 60670-24
IEC 61009-1:2010 NOTE Approved as EN 61009-1:2012 +A11:2015
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.
Clause 2 of EN IEC 61439-1:2021 is applicable, except as follows:
Add the following references:
Publication Year Title EN/HD Year
IEC 60068-2-75 - Environmental testing - Part 2-75: Tests - EN 60068-2-75 -
Test Eh: Hammer tests
IEC 60269-3 - Low-voltage fuses - Part 3: Supplementary HD 60269-3 -
requirements for fuses for operation by
unskilled persons (fuses mainly for
household and similar applications) -
Examples of standardized systems of
fuses A to F
IEC 60364-8-82 - Low-voltage electrical installations - Part 8- HD 60364-8-82 -
82: Functional aspects - Prosumer's low-
voltage electrical installations
IEC 60669-2-4 - Switches for household and similar fixed EN 60669-2-4 -
electrical installations - Part 2-4: Particular
requirements - Isolating switches
IEC 60898-1 - Electrical accessories - Circuit-breakers for EN 60898-1 -
overcurrent protection for household and
similar installations - Part 1: Circuit-
breakers for a.c. operation
IEC 60947-3 - Low-voltage switchgear and controlgear - EN IEC 60947-3 -
Part 3: Switches, disconnectors, switch-
disconnectors and fuse-combination units
IEC 61008 series Residual current operated circuit-breakers EN 61008 series
without integral overcurrent protection for
household and similar uses (RCCBs) - Part
1: General rules
IEC 61009 series Residual current operated circuit-breakers EN 61009 series
with integral overcurrent protection for
household and similar uses (RCBOs) - Part
1: General rules
Publication Year Title EN/HD Year
IEC 61439-1 2020 Low-voltage switchgear and controlgear EN IEC 61439-1 2021
assemblies - Part 1: General rules
IEC 62262 - Degrees of protection provided by EN 62262 -
enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62423 (mod) 2009 Type F and type B residual current EN 62423 2012
operated circuit-breakers with and without
integral overcurrent protection for
household and similar uses
- - + A11 2021
- - + A12 2022
IEC 62606 - General requirements for arc fault EN 62606 -
detection devices
IEC 61439-3 ®
Edition 2.0 2024-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –

Part 3: Distribution boards intended to be operated by ordinary persons (DBO)

Ensembles d'appareillage à basse tension –

Partie 3: Tableaux de répartition destinés à être utilisés par des personnes

ordinaires (DBO)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20  ISBN 978-2-8322-8364-6

– 2 – IEC 61439-3:2024 © IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols and abbreviations . 7
5 Interface characteristics. 7
6 Information . 8
7 Service conditions . 9
8 Constructional requirements . 9
9 Performance requirements. 11
10 Design verification . 11
11 Routine verification . 15
Annexes . 18
Annex AA (informative) Items subject to agreement between the DBO manufacturer
and the user . 19
Annex BB (informative) Effects upon a DBO design and related ratings, instructions,
etc. when used in a prosumer’s electrical installation (PEI) . 23
Annex CC (informative) Rated current of an assembly (I ) . 24
nA
Annex DD (informative) List of notes concerning certain countries . 26
Bibliography . 40

Figure CC.1 – Example of overloading where I + I is greater than I . 25
n gen(s) nA
Figure DD.1 – Example of temperature rise verification by test of a complete split‑load
DBO as in 10.10.2.3.6 . 32
Figure DD.2 – Calibration of the test circuit . 36
Figure DD.3 – Test circuit to prove coordination of characteristics . 39

Table 101 – Values of assumed loading . 16
Table 102 – Tightening torque values for the verification of mechanical strength . 17
Table AA.1 – Items subject to agreement between the DBO manufacturer and the user . 19
Table DD.1 – Requirements for final circuit protective devices: Circuit-breakers
complying with BS EN 60898 and RCBOs complying with BS EN 61009 . 33
Table DD.2 – Requirements for final circuit protective devices: Semi-enclosed fuses

complying with BS 3036 and cartridge fuses complying with BS 88.3 . 34
Table DD.3 – Cross-sections of copper conductors on load side of protective device
under test . 34
Table DD.4 – Preparation for Test B . 37

IEC 61439-3:2024 © IEC 2024 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –

Part 3: Distribution boards intended to be operated
by ordinary persons (DBO)
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 sen
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