SIST EN IEC 60947-6-1:2023
(Main)Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment (IEC 60947-6-1:2021)
Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment (IEC 60947-6-1:2021)
This part of EN 60947applies to transfer switching equipment (TSE) to be used in power systems with interruption of the supply to the load during transfer, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.
Niederspannungsschaltgeräte - Teil 6-1: Mehrfunktionsschaltgeräte - Netzumschalter (IEC 60947-6-1:2021)
Appareillage à basse tension - Partie 6-1: Matériels à fonctions multiples - Matériels de connexion de transfert (IEC 60947-6-1:2021)
La présente partie de la EN 60947 est applicable aux matériels de connexion de transfert (TSE) destinés à être utilisés dans des systèmes de puissance, avec interruption de l'alimentation de la charge pendant le transfert, dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu.
Nizkonapetostne stikalne in krmilne naprave - 6-1. del: Večfunkcijska oprema - Oprema za samodejno predajanje stikanja (IEC 60947-6-1:2021)
Ta del standarda EN 60947 se uporablja za opremo za samodejno predajanje stikanja (TSE), ki je namenjena uporabi v napajalnih sistemih s prekinitvijo napajanja zaradi obremenitve med prenosom, katerih nazivna napetost ne presega 1000 V izmenične napetosti ali 1500 V enosmerne napetosti.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2023
Nizkonapetostne stikalne in krmilne naprave - 6-1. del: Večfunkcijska oprema -
Oprema za samodejno predajanje stikanja (IEC 60947-6-1:2021)
Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment -
Transfer switching equipment (IEC 60947-6-1:2021)
Niederspannungsschaltgeräte - Teil 6-1: Mehrfunktionsschaltgeräte - Netzumschalter
(IEC 60947-6-1:2021)
Appareillage à basse tension - Partie 6-1: Matériels à fonctions multiples - Matériels de
connexion de transfert (IEC 60947-6-1:2021)
Ta slovenski standard je istoveten z: EN IEC 60947-6-1:2023
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 60947-6-1
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2023
ICS 29.130.20; 29.120.40 Supersedes EN 60947-6-1:2005; EN 60947-6-
1:2005/A1:2014
English Version
Low-voltage switchgear and controlgear - Part 6-1: Multiple
function equipment - Transfer switching equipment
(IEC 60947-6-1:2021)
Appareillage à basse tension - Partie 6-1: Matériels à Niederspannungsschaltgeräte - Teil 6-1:
fonctions multiples - Equipement de transfert de source Mehrfunktionsschaltgeräte - Netzumschalter
(IEC 60947-6-1:2021) (IEC 60947-6-1:2021)
This European Standard was approved by CENELEC on 2021-04-20. 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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-6-1:2023 E
European foreword
The text of document 121A/403/FDIS, future edition 3 of IEC 60947-6-1, 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) 2023-11-19
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-05-19
document have to be withdrawn
This document supersedes EN 60947-6-1:2005 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.
This document has been prepared under a Standardization Request given to CENELEC by the
European Commission and the European Free Trade Association, and supports essential
requirements of EU Directive(s) / Regulation(s).
For the relationship with EU Directive(s) / Regulation(s), see informative Annexes ZZA and ZZB, which
are an integral part of this document.
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 60947-6-1:2021 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 60034-12:2016 NOTE Approved as EN 60034-12:2017 (not modified)
IEC 60079 (series) NOTE Approved as EN IEC 60079 (series)
IEC 60364-1:2005 NOTE Approved as HD 60364-1:2008 +A11:2017
IEC 60364-5-56 NOTE Approved as HD 60364-5-56
IEC 60947-5-1 NOTE Approved as EN 60947-5-1
IEC 60947-6-2:2020 NOTE Approved as EN IEC 60947-6-2:2023
IEC 61439 (series) NOTE Approved as EN IEC 61439 (series)
IEC 62443 (series) NOTE Approved as EN IEC 62443 (series)
IEC/TR 63201 NOTE Approved as CLC IEC/TR 63201
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 60068-2-2 2007 Environmental testing - Part 2-2: Tests - Test EN 60068-2-2 2007
B: Dry heat
IEC 60417 - Graphical symbols for use on equipment -
IEC 60715 2017 Dimensions of low-voltage switchgear and EN 60715 2017
controlgear - Standardized mounting on rails
for mechanical support of switchgear,
controlgear and accessories
IEC 60812 - Failure modes and effects analysis (FMEA EN IEC 60812 2018
and FMECA)
IEC 60947 (all parts) Low-voltage switchgear and controlgear EN 60947 -
IEC 60947-1 2020 Low-voltage switchgear and controlgear – EN IEC 60947-1 2021
Part 1: General rules
+ AC 2023-01
IEC 60947-2 2016 Low-voltage switchgear and controlgear – EN 60947-2 2017
Part 2: Circuit-breakers
+ A1 2019 + A1 2020
IEC 60947-3 2020 Low-voltage switchgear and controlgear - EN IEC 60947-3 2021
Part 3: switches, disconnectors, switch-
disconnectors and fuse-combination units
+ AC 2021-11
IEC 60947-4-1 2018 Low-voltage switchgear and controlgear - EN IEC 60947-4-1 2019
Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-
starters
+ AC 2020-05
+ AC 2021-04
Those parts of the EN 60947 series listed in reference are those listed in the rows below.
Publication Year Title EN/HD Year
IEC 61000-4-13 2002 Electromagnetic compatibility (EMC) – Part EN 61000-4-13 2002
4-13: Testing and measurement techniques
– Harmonics and interharmonics including
mains signalling at a.c. power port, low-
frequency immunity tests
+ A1 2009 + A1 2009
+ A2 2015 + A2 2016
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
Annex ZZA
(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 standardisation request relating to
harmonised 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 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
[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 safety objectives of
that Directive, and associated EFTA regulations.
Table ZZA.1 — Correspondence between this European standard and Annex I of
Directive 2014/35/EU [2014 OJ L96]
Safety objectives of Clause(s) / sub-clause(s) of this EN Remarks/note
Directive 2014/35/EU
1 a) 4, 5, 6, 8
1 b) 5, 6, 7, 8, 9
1 c) 4, 5, 6, 7, 8, 9, Annex A,
2 a) 5, 6, 8, 9, Annex A
2 b) 5, 6, 8, 9
2 c) 5, 6, 7, 8
2 d) 5, 6, 8, 9
3 a) 5, 6, 7, 8, 9
3 b) 4, 5, 6, 7, 8, 9
3 c) 5, 6, 8, 9
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.
Annex ZZB
(informative)
Relationship between this European standard and the essential
requirements of Directive 2014/30/EU [2014 OJ L96] aimed to be
covered
This European standard has been prepared under the European Commission standardisation request
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 ZZB.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 ZZB.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
Remarks / Notes
of Directive 2014/30/EU
of this EN
Annex I. 1(a) 8.3.1, 8.3.3, 9.2.8.1, 9.2.8.3 When this standard in subclauses 8.3.3
(electromagnetic and 9.2.8.3 normatively references EN
55011 for emission requirements the
disturbances)
following applies:
With respect to Clause 3.19 of EN 55011
(Type Test), the following shall not be
applied if Clause 6 (Limits of
electromagnetic disturbances) is applied
for the purposes of the presumption of
conformity: 'Note 1 to entry: Recognition
of a type test as type approval may
depend on national or regional regulation,
see H.2 in Annex H.’
With respect to Clause 7.1 of EN 55011
(General), the following shall not be
applied, if Clause 6 of EN 55011 (Limits
of electromagnetic disturbances) is
applied for the purposes of the
presumption of conformity: 'Requirements
which relate to measurements at such
test sites are type test requirements. A
type test may be recognized as type
approval if the conditions for the statistical
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.
assessment of measurement results
according to Annex H are observed.'
With respect to Clause 3.19 of EN 55011
(Type Test), the following shall not be
applied, if Clause 7 of EN 55011
(Measurement requirements) is applied
for the purposes of the presumption of
conformity:
'Note 1 to entry: Recognition of a type
test as type approval may depend on
national or regional regulation, see H.2 in
Annex H.’
With respect to Clause 7.1 of EN 55011
(General), the following shall not be
applied, if Clause 7 of EN 55011
(Measurement requirements) is applied
for the purposes of the presumption of
conformity:
'Requirements which relate to
measurements at such test sites are type
test requirements. A type test may be
recognized as type approval if the
conditions for the statistical assessment
of measurement results according to
Annex H are observed.'
Annex I. 1(b) 8.3.1, 8.3.2, 9.2.8.1, 9.2.8.2
(electromagnetic
immunity)
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.
IEC 60947-6-1 ®
Edition 3.0 2021-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 6-1: Multiple function equipment – Transfer switching equipment
Appareillage à basse tension –
Partie 6-1: Matériels à fonctions multiples – Equipement de transfert de source
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.40; 29.130.20 ISBN 978-2-8322-9448-2
– 2 – IEC 60947-6-1:2021 IEC 2021
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
3.1 General . 9
3.2 Alphabetical index of terms . 10
3.3 Transfer switching devices . 10
3.4 Operation of TSE . 12
3.5 Main contact positions . 13
3.6 Symbols and abbreviated terms . 14
4 Classification . 14
5 Characteristics . 15
5.1 Summary of characteristics . 15
5.2 Type and characteristics of equipment . 15
5.3 Rated and limiting values for the main circuit . 16
5.3.1 General . 16
5.3.2 Rated voltages . 16
5.3.3 Rated operational current (I ) . 16
e
5.3.4 Rated frequency . 16
5.3.5 Rated making and breaking capacities . 16
5.3.6 Short-circuit characteristics . 17
5.4 Utilization category . 17
5.5 Control circuits . 18
5.5.1 General . 18
5.5.2 Electro-mechanical devices operating the main circuit . 18
5.5.3 ATS controller. 18
5.6 Auxiliary circuits . 18
6 Product information . 18
6.1 Nature of information . 18
6.2 Marking . 18
6.3 Instructions for installation, operation and maintenance, decommissioning
and dismantling. 20
6.4 Environmental information . 21
7 Normal service, mounting and transport conditions . 22
8 Constructional and performance requirements . 22
8.1 Constructional requirements . 22
8.1.1 General . 22
8.1.2 Materials . 22
8.1.3 Indication of the switching position . 23
8.1.4 Equipment suitable for isolation . 23
8.1.5 Opening and closing of main contacts . 23
8.1.6 Clearances and creepage distances . 23
8.1.7 Provision for protective earthing . 23
8.1.8 Stored charge energy circuit . 23
IEC 60947-6-1:2021 IEC 2021 – 3 –
8.1.9 Stored energy closing . 24
8.1.10 Dedicated enclosures for TSE . 24
8.2 Performance requirements . 24
8.2.1 Operating conditions . 24
8.2.2 Temperature-rise . 25
8.2.3 Dielectric properties . 25
8.2.4 Ability to make, carry, and break under no-load, normal load and
overload conditions . 25
8.2.5 Ability to make and break under short-circuit conditions . 27
8.2.6 Critical load current performance (DC equipment) . 29
8.3 Electromagnetic compatibility (EMC) . 29
8.3.1 General . 29
8.3.2 Immunity . 29
8.3.3 Emission . 30
9 Tests . 30
9.1 Kinds of tests . 30
9.2 Type tests . 30
9.2.1 General test conditions . 30
9.2.2 Test sequences . 30
9.2.3 Test sequence I – General performance characteristics . 33
9.2.4 Test sequence II – Operational performance capability . 39
9.2.5 Test sequence III – Short-circuit performance capability . 44
9.2.6 Test sequence IV – Conditional short-circuit current . 47
9.2.7 Test sequence V – critical load current performance of equipment with a
DC rating . 48
9.2.8 Test sequence VI – EMC tests . 51
9.3 Routine tests. 53
9.4 Environmental tests . 55
Annex A (normative) Assignment of utilization categories based on results of tests . 57
Annex B (informative) Items subject to agreement between manufacturer and user . 58
Bibliography . 59
Figure 1 – Example of operating sequences for TSE with three positions . 21
Figure 2 – Test circuit for connection to source I and source II supplies . 54
Figure 3 – Test circuit for the verification of making and breaking capacities . 55
Table 1 – Utilization categories . 18
Table 2 – Product information . 19
Table 3 – Verification of making and breaking capacity – Conditions for making and
breaking corresponding to the utilization categories . 26
Table 4 – Verification of operational performance – Conditions for making and breaking
corresponding to the utilization categories . 27
Table 5 – Value of the test current for the verification of the ability to operate under
short-circuit conditions . 28
Table 6 – Value of the test current for the verification of the ability to operate under
short-circuit conditions (harmonized table) . 29
Table 7 – Acceptance criteria of immunity test . 30
Table 8 – List of type tests (overall scheme of test sequences) . 31
– 4 – IEC 60947-6-1:2021 IEC 2021
Table 9 – List of type tests to which a derived TSE shall be submitted . 32
Table 10 – Number and duration of operating cycles for the making and breaking
capacity test . 41
Table 11 – Number and rate of operating cycles for the electrical and mechanical
operational performance tests for type A utilization categories . 42
Table 12 – Number and rate of operating cycles for the electrical and mechanical
operational performance tests for type B utilization categories . 42
Table 13 – Temperature-rise limits for terminals and accessible parts . 43
Table 14 – Number of operating cycles corresponding to the critical load current . 50
Table 15 – Test circuit parameters for Table 14 . 50
Table 16 – Test sequence V: Critical load current performance of equipment with a DC
rating . 51
IEC 60947-6-1:2021 IEC 2021 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 6-1: Multiple function equipment –
Transfer switching equipment
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 60947-6-1 has been prepared by sub-committee 121A: Low-
voltage switchgear and controlgear, 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 2005, and its
Amendment 1:2013. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– clarification of scope and object;
– clarification of terms and definitions;
– removal of unnecessary definitions;
– modification of characteristics;
– 6 – IEC 60947-6-1:2021 IEC 2021
– modification of utilization categories definitions;
– introduction of new markings requirements;
– addition of new requirements for clearances and creepage distances;
– addition of new requirements and tests for mechanical and electrical interlocks;
– clarification of transfer sequences;
– modification of requirements for rated short-time withstand currents;
– modification of new requirements for electromagnetic compatibility;
– clarification of performance requirements for CB type TSE, in alignment with requirements
stated in IEC 60947-2;
– addition of new test sequence V: Critical load current performance of equipment with DC
ratings.
The text of this document is based on the following documents:
FDIS Report on voting
121A/403/FDIS 121A/411/RVD
Full information on the voting for the approval of this document can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60947 series, published under the general title Low-voltage
switchgear and controlgear, can be found on the IEC website.
This document shall be read in conjunction with IEC 60947-1:2020, Low voltage switchgear
and controlgear – Part 1: General rules.
The provisions of the general rules are applicable to IEC 60947-1 where specifically called
for. General rules clauses and subclauses thus applicable as well as tables, figures and
appendices are identified by reference to IEC 60947-1:2020, for example, 1.2.3, Table 4, or
Annex A of IEC 60947-1:2020.The committee has decided that the contents of this publication
will remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
considered to be useful for the correct
that it contains colours which are
understanding of its contents. Users should therefore print this document using a
colour printer.
IEC 60947-6-1:2021 IEC 2021 – 7 –
INTRODUCTION
The availability of power in low voltage electrical installations is playing an ever increasing
role in modern society. In actual fact, this requirement is a fundamental characteristic for the
creation of economically and functionally efficient installations. A system able to switch a load
from one source to another safely and with minimum disturbance to the load reduces
problems caused by faulty conditions in the normal supply to the minimum.
All these operations, commonly known as “transfer switching”, control the installations and
can be done automatically, remotely or manually.
Therefore, an installation with installed “transfer switching” capability:
– ensures the continuity of production processes;
– provides a backup source of power if the main network is out of service;
– reduces the effect caused by network faults on parts of the installation;
– achieves a good compromise between reliability, simplicity and cost-effectiveness;
– provides the facility manager and managing system with a power source able to supply all
or part of the installation.
Key factors motivating customers to use Transfer Switch Equipment (TSE) include:
– the continuous world growth population, the increasing number of electronic devices and
the new demands of electric vehicles;
– the mediated pressure on climate change with a resulting increase in the cost of energy;
– the evolution of the electricity market with a greater number of alternate energy sources;
– the user’s expectations of better grid reliability, better economic performance, and a desire
to manage their energy.
Stakeholders involved in the management of electricity also have new expectations:
– customers want to reduce the cost of their energy and to have a quality energy supply;
– suppliers want to reinforce confidence to their customers;
– producers expect to optimize their investments;
– governments and regulators are willing to create a competitive and sustainable energy
market.
Today, the performance of Transfer Switching Equipment is defined by TSE manufacturers
and also by this document. Consultants, integrators, facility managers and end users rely on
this document for their power availability needs.
Transfer switching are often realised by implementing a transfer function within the electrical
installation, but this critical function can be inappropriately designed. Using a TSE following
the requirements of this document ensures the safety and the performance of the transfer
function which are necessary for reaching the objectives listed above.
– 8 – IEC 60947-6-1:2021 IEC 2021
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 6-1: Multiple function equipment –
Transfer switching equipment
1 Scope
This document applies to transfer switching equipment (TSE), to be used in power systems
for ensuring the continuity of the supply and allowing the energy management of the
installation, by transferring a load between power supply sources, the rated voltage of which
does not exceed 1 000 V AC or 1 500 V DC.
It covers:
– manually operated transfer switching equipment (MTSE);
– remotely operated transfer switching equipment (RTSE);
– automatic transfer switching equipment (ATSE), including the controller.
It does not cover:
1) TSE configurations that are either not manufacturer tested and/or not marked according
to this document as a complete transfer switch;
2) auxiliary contacts (for guidance, see IEC 60947-5-1);
3) transfer switches used in explosive atmospheres (for guidance, see IEC 60079 (all
parts));
4) embedded software design (for guidance, see IEC TR 63201);
5) cybersecurity aspects (for guidance, see IEC TS 63208);
6) TSE rated for direct-on-line starting asynchronous motor of design NE and HE, according
to IEC 60034-12:2016 (for guidance, see AC-3e utilisation category according IEC 60947-
4-1:2018);
7) other types of TSE under consideration including closed transition TSE, overlapping
neutral TSE, multi-source TSE (i.e. TSE with more than two sources of supply), stand-
alone ATS controllers, bypass isolation TSE, TSE with load-shedding functions and bus-
tie TSE.
NOTE TSE used for safety services and for emergency escape lighting systems as described in IEC 60364-5-56
are subject to specific rules and/or legal requirements.
The object of this document is to state:
1) the characteristics of the equipment;
2) the conditions of the equipment with respect to:
a) operation for which the equipment is intended;
b) operation and behaviour in case of specified abnormal conditions, for example, short-
circuit;
c) dielectric properties;
3) the tests intended to confirm that these conditions have been met and the methods for
performing these tests;
4) the product information to be provided by the manufacturer.
IEC 60947-6-1:2021 IEC 2021 – 9 –
2 Normative references
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.
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-
symbols.info/equipment)
IEC 60715:2017, Dimensions of low-voltage switchgear and controlgear – Standardized
mounting on rails for mechanical support of switchgear, controlgear and accessories
IEC 60812, Failure modes and effects analysis (FMEA and FMECA)
IEC 60947 (all parts), Low-voltage switchgear and controlgear
IEC 60947-1:2020, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-2:2016, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-2:2016/AMD1:2019
IEC 60947-3:2020, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 60947-4-1:2018, Low-voltage switchgear and controlgear – Part 4-1: Contactors and
motor-starters – Electromechanical contactors and motor-starters
IEC 61000-4-13:2002, Electromagnetic compatibility (EMC) – Part 4-13: Testing and
measurement techniques – Harmonics and interharmonics including mains signalling at a.c.
power port, low frequency immunity tests
IEC 61000-4-13:2002/AMD1:2009
IEC 61000-4-13:2002/AMD2:2015
CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 11:2015/AMD1:2016
3 Terms and definitions
3.1 General
For the purposes of this document, the terms and definitions given in Clause 3 of IEC 60947-
1:2020, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• ISO Online browsing platform: available at http://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
– 10 – IEC 60947-6-1:2021 IEC 2021
3.2 Alphabetical index of terms
Reference
A
ATS controller . 3.3.9
Automatic transfer switching equipment (ATSE) . 3.3.4
C
Contact transfer time . 3.4.5
Class CB TSE . 3.3.7
Class CC TSE . 3.3.8
Class PC TSE . 3.3.6
Closed transition . 3.4.9
D
Derived transfer switching equipment (derived TSE) . 3.3.5
Dedicated wiring accessories . 3.3.10
F
Frequency supply deviation . 3.4.4
I
Interlocking . 3.4.10
In-phase transfer . 3.4.8
M
Manually operated transfer switching equipment (MTSE) . 3.3.2
Monitored supply deviation . 3.4.2
O
OFF position . 3.5.4
Open transition . 3.4.7
Operating sequence . 3.4.1
Operating transfer time . 3.4.6
P
Position I…………………………………………………………………………………………. 3.5.2
Position II ………………………………………………………………………………… . 3.5.3
R
Remotely operated transfer switching equipment (RTSE) . 3.3.3
S
Switching position . 3.5.1
T
Transfer switching equipment (TSE) . 3.3.1
V
Voltage supply deviation . 3.4.3
3.3 Transfer switching devices
3.3.1
transfer switching equipme
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...