SIST EN IEC 60947-5-8:2021
(Main)Low-voltage switchgear and controlgear - Part 5-8: Control circuit devices and switching elements - Three-position enabling switches (IEC 60947-5-8:2020)
Low-voltage switchgear and controlgear - Part 5-8: Control circuit devices and switching elements - Three-position enabling switches (IEC 60947-5-8:2020)
This part of IEC 60947 series specifies requirements for three-position enabling switches.
These switches are used as components of enabling devices to provide signals that,
a) when activated, allow machine operation to be initiated by a separate start control, and
b) when de-activated,
– initiate a stop function, and
– prevent initiation of machine operation.
NOTE 1 The enabling control function is described in 9.2.3.9 of IEC 60204-1:2016 but the application of threeposition
enabling switches is not limited to a component of the enabling device described in IEC 60204-1.
NOTE 2 This document does not deal with enabling devices.
These switches are intended to be connected to circuits which rated voltage does not exceed
250 V AC 50 Hz/60 Hz or 300 V DC.
EXAMPLE Devices incorporating three-position enabling switches are:
– push-button enabling devices;
– grip actuated enabling devices;
– foot actuated enabling devices.
See Annex A for more typical examples.
This document does not apply to:
– three-position enabling switches for non-electrical control circuits, for example hydraulic,
pneumatic;
– enabling switches without three-position mechanism;
– emergency stop devices (see IEC 60947-5-5).
Niederspannungsschaltgeräte - Teil 5-8: Steuergeräte und Schaltelemente - Drei-Stellungs-Zustimmschalter (IEC 60947-5-8:2020)
Appareillage à basse tension - Partie 5-8: Appareils et éléments de commutation pour circuit de commande - Interrupteurs de commande de validation à trois positions (IEC 60947-5-8:2020)
IEC 60947-5-8:2020 est disponible sous forme de IEC 60947-5-8:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60947-5-8:2020 spécifie les exigences pour les interrupteurs de commande de validation à trois positions. Ces interrupteurs sont utilisés comme composants dans les appareils de commande de validation pour fournir des signaux qui:
- lorsqu’ils sont activés, permettent la mise en marche de la machine par une commande séparée de démarrage; et
- lorsqu’ils sont désactivés:
-- initient une fonction d’arrêt; et
-- évitent la mise en marche de la machine.
Cette deuxième édition annule et remplace la première édition parue en 2006. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- en raison du nombre croissant d’applications utiles possibles avec les interrupteurs de commande de validation à trois positions, le domaine d’application, les caractéristiques de fonctionnement et les essais sont revus;
- des figures représentant des exemples d’appareils incorporant un interrupteur de commande de validation sont ajoutées dans l’Annexe A;
- une nouvelle Annexe B est ajoutée, incluant une procédure visant à déterminer des données de fiabilité pour l’interrupteur utilisé dans des applications de sécurité fonctionnelle.
Nizkonapetostne stikalne naprave - 5-8. del: Krmilne naprave in stikalni elementi - Tripoložajna omogočilna stikala (IEC 60947-5-8:2020)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60947-5-8:2021
01-junij-2021
Nadomešča:
SIST EN 60947-5-8:2007
Nizkonapetostne stikalne naprave - 5-8. del: Krmilne naprave in stikalni elementi -
Tripoložajna omogočilna stikala (IEC 60947-5-8:2020)
Low-voltage switchgear and controlgear - Part 5-8: Control circuit devices and switching
elements - Three-position enabling switches (IEC 60947-5-8:2020)
Niederspannungsschaltgeräte - Teil 5-8: Steuergeräte und Schaltelemente - Drei-
Stellungs-Zustimmschalter (IEC 60947-5-8:2020)
Appareillage à basse tension - Partie 5-8: Appareils et éléments de commutation pour
circuit de commande - Interrupteurs de commande de validation à trois positions (IEC
60947-5-8:2020)
Ta slovenski standard je istoveten z: EN IEC 60947-5-8:2021
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN IEC 60947-5-8:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 60947-5-8:2021
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SIST EN IEC 60947-5-8:2021
EUROPEAN STANDARD EN IEC 60947-5-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 29.130.20 Supersedes EN 60947-5-8:2006 and all of its
amendments and corrigenda (if any)
English Version
Low-voltage switchgear and controlgear - Part 5-8: Control
circuit devices and switching elements - Three-position enabling
switches
(IEC 60947-5-8:2020)
Appareillage à basse tension - Partie 5-8: Appareils et Niederspannungsschaltgeräte - Teil 5-8: Steuergeräte und
éléments de commutation pour circuits de commande - Schaltelemente - Drei-Stellungs-Zustimmschalter
Interrupteurs de commande de validation à trois positions (IEC 60947-5-8:2020)
(IEC 60947-5-8:2020)
This European Standard was approved by CENELEC on 2020-09-16. 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,
Turkey 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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-5-8:2021 E
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SIST EN IEC 60947-5-8:2021
EN IEC 60947-5-8:2021 (E)
European foreword
The text of document 121A/358/FDIS, future edition 2 of IEC 60947-5-8, prepared by SC 121A "Low-
voltage switchgear and controlgear" of IEC/TC 121 "Switchgear and controlgear and their assemblies
for low voltage" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60947-5-8:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-10-02
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-04-02
document have to be withdrawn
This document supersedes EN 60947-5-8:2006 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 mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
Endorsement notice
The text of the International Standard IEC 60947-5-8:2020 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60204-1:2016 NOTE Harmonized as EN 60204-1:2018 (modified)
IEC 60695-2-10:2013 NOTE Harmonized as EN 60695-2-10:2013 (not modified)
IEC 60695-2-11:2014 NOTE Harmonized as EN 60695-2-11:2014 (not modified)
IEC 60695-2-12:2010 NOTE Harmonized as EN 60695-2-12:2010 (not modified)
IEC 60695-2-12:2010/A1:2014 NOTE Harmonized as EN 60695-2-12:2010/A1:2014 (not modified)
IEC 60947-5-5:1997 NOTE Harmonized as EN 60947-5-5:1997 (not modified)
IEC 60947-5-5:1997/A1:2005 NOTE Harmonized as EN 60947-5-5:1997/A1:2005 (not modified)
IEC 60947-5-5:1997/A2:2016 NOTE Harmonized as EN 60947-5-5:1997/A2:2017 (not modified)
2
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SIST EN IEC 60947-5-8:2021
EN IEC 60947-5-8:2021 (E)
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.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-1 2007 Environmental testing - Part 2-1: Tests - EN 60068-2-1 2007
Test A: Cold
IEC 60068-2-2 2007 Environmental testing - Part 2-2: Tests - EN 60068-2-2 2007
Test B: Dry heat
IEC 60068-2-6 2007 Environmental testing - Part 2-6: Tests - EN 60068-2-6 2008
Test Fc: Vibration (sinusoidal)
IEC 60068-2-27 2008 Environmental testing - Part 2-27: Tests - EN 60068-2-27 2009
Test Ea and guidance: Shock
IEC 60947-1 2020 Low-voltage switchgear and controlgear - EN IEC 60947-1 2021
Part 1: General rules
IEC 60947-5-1 2016 Low-voltage switchgear and controlgear - EN 60947-5-1 2017
Part 5-1: Control circuit devices and
switching elements - Electromechanical
control circuit devices
3
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SIST EN IEC 60947-5-8:2021
EN IEC 60947-5-8:2021 (E)
Annex ZZ
(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 ZZ.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 ZZ.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 Remarks/note
Directive 2014/35/EU this EN
1 a) 6
1 b) 4, 5, 6
1 c) 4, 5, 6 Also refer to 2 a) to 2 d) and 3 a) to 3
c) in this table
2 a) 4, 5, 6.1, 6.3, 7.2, 8.1, 9.2, 9.3
2 b) 6.1, 6.3, 8.1, 8.2, 9.1, 9.2, 9.3 This standard does not deal with any
specific requirements on acoustic
noise and optical radiation.
2 c) 4, 5, 6.2, 6.3, 8.1, 8.2, 9.2, 9.3
2 d) 4, 5, 6.2, 6.3, 7, 8.1, 8.2, 9.2, Special environmental conditions
9.3 differing from those given in 7.1 are not
covered by this standard.
3 a) 4, 5, 6.2, 6.3, 7, 9.2, 9.3
3 b) 4, 5, 9.1 Special environmental conditions
differing from those given in 7.1 are not
covered by this standard.
3 c) 4, 5, 6.2, 7, 8.2, 9.3
WARNING 1: Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2: Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
4
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SIST EN IEC 60947-5-8:2021
IEC 60947-5-8
®
Edition 2.0 2020-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 5-8: Control circuit devices and switching elements – Three-position
enabling switches
Appareillage à basse tension –
Partie 5-8: Appareils et éléments de commutation pour circuits de commande –
Interrupteurs de commande de validation à trois positions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-8606-7
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60947-5-8:2021
– 2 – IEC 60947-5-8:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Classification . 7
5 Characteristics . 7
6 Product information . 8
7 Normal service, mounting and transport conditions . 9
8 Constructional and performance requirements . 10
9 Tests . 14
Annex A (informative) Example of enabling devices incorporating a three-position
enabling switch . 21
Annex B (normative) Procedure to determine reliability data for three-position enabling
switches used in functional safety applications . 24
Bibliography . 25
Figure 1 – Operation of three-position enabling switches . 12
Figure 2 – Operating force, travel and enabling contact status . 13
Figure A.1 – Grip type enabling device . 21
Figure A.2 – One hand teaching pendant type enabling device . 21
Figure A.3 – Two hand teaching pendant type enabling device . 22
Figure A.4 – Manual pulse generator . 22
Figure A.5 – Grip type enabling device for hand-held machine . 22
Figure A.6 – Foot actuated enabling device . 23
Figure A.7 – Hoist controller . 23
Figure A.8 – Joystick type enabling device . 23
Table 1 – Force values for F . 13
2
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SIST EN IEC 60947-5-8:2021
IEC 60947-5-8:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 5-8: Control circuit devices and switching elements –
Three-position enabling switches
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 60947-5-8 has been prepared by subcommittee 121A: Low-voltage
switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and
their assemblies for low voltage.
This second edition cancels and replaces the first edition published in 2006. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) due to the increasing range of useful applications of three-position enabling switches, note
of scope, operational characteristics and tests are reviewed;
b) figures for example of devices incorporating enabling switch are added in Annex A;
c) new Annex B for procedure to determine reliability data for the switch used in functional
safety applications is added.
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SIST EN IEC 60947-5-8:2021
– 4 – IEC 60947-5-8:2020 © IEC 2020
The text of this document is based on the following documents:
FDIS Report on voting
121A/358/FDIS 121A/369/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 document should be used in conjunction with IEC 60947-1:2020 and
IEC 60947-5-1:2016.
The provisions of the general rules, IEC 60947-1, are applicable to this standard, where
specifically called for. General rules clauses and subclauses thus applicable, as well as tables,
figures and annexes are identified by a reference to IEC 60947-1, for example 1.2.3 or
Annex A of IEC 60947-1:2020.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60947 series, under the general title Low-voltage switchgear and
controlgear, 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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
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SIST EN IEC 60947-5-8:2021
IEC 60947-5-8:2020 © IEC 2020 – 5 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 5-8: Control circuit devices and switching elements –
Three-position enabling switches
1 Scope
This part of IEC 60947 series specifies requirements for three-position enabling switches.
These switches are used as components of enabling devices to provide signals that,
a) when activated, allow machine operation to be initiated by a separate start control, and
b) when de-activated,
– initiate a stop function, and
– prevent initiation of machine operation.
NOTE 1 The enabling control function is described in 9.2.3.9 of IEC 60204-1:2016 but the application of three-
position enabling switches is not limited to a component of the enabling device described in IEC 60204-1.
NOTE 2 This document does not deal with enabling devices.
These switches are intended to be connected to circuits which rated voltage does not exceed
250 V AC 50 Hz/60 Hz or 300 V DC.
EXAMPLE Devices incorporating three-position enabling switches are:
– push-button enabling devices;
– grip actuated enabling devices;
– foot actuated enabling devices.
See Annex A for more typical examples.
This document does not apply to:
– three-position enabling switches for non-electrical control circuits, for example hydraulic,
pneumatic;
– enabling switches without three-position mechanism;
– emergency stop devices (see IEC 60947-5-5).
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 60068-2-1:2007, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-6:2007, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-27:2008, Environmental testing – Part 2-27: Tests – Test Ea and guidance:
Shock
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SIST EN IEC 60947-5-8:2021
– 6 – IEC 60947-5-8:2020 © IEC 2020
IEC 60947-1:2020, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-5-1:2016, Low-voltage switchgear and controlgear – Part 5-1: Control circuit
devices and switching elements – Electromechanical control circuit devices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Clause 3 of IEC 60947-
1:2020 and Clause 2 of IEC 60947-5-1:2016, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
Alphabetical index of definitions
Reference
A
Actuating system . 3.3
Actuator . 3.4
Auxiliary contact . 3.5
E
Enabling contact . 3.6
Enabling device . 3.1
T
Three-position enabling switch . 3.2
3.1
enabling device
manually operated control device used in conjunction with a start control and which, when
continuously actuated, allows a machine operation
3.2
three-position enabling switch
three-position switch having enabling contact(s)
3.3
actuating system
all the mechanical parts which transmit the actuating force to
the contact elements
[SOURCE: IEC 60050-441:2000, 441-15-21, modified – "all the operating means of a control
switch" replaced by "all the mechanical parts", note to entry deleted.]
3.4
actuator
part of the actuating system which is actuated by a part of
the human body
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SIST EN IEC 60947-5-8:2021
IEC 60947-5-8:2020 © IEC 2020 – 7 –
EXAMPLE A button.
3.5
auxiliary contact
contact of a three-position enabling switch that provides an auxiliary function
Note 1 to entry: Auxiliary contacts can be normally open and/or normally closed.
3.6
enabling contact
contact of a three-position enabling switch, which is closed when the actuator is in the mid
position (partly depressed, position 2 in Figure 1) and is open when the actuator is in the rest
position (not pressed, position 1 in Figure 1) and in the fully depressed position (position 3 in
Figure 1)
4 Classification
4.1 Contact elements
Subclause 3.1 of IEC 60947-5-1:2016 applies.
4.2 Three-position enabling switch
Three-position enabling switches may be classified according to the contact element and the
nature of the actuating system, e.g. three-position enabling switches, form B.
5 Characteristics
5.1 Summary of characteristics
5.1.1 General
Subclause 4.1.1 of IEC 60947-5-1:2016 applies except for following type of equipment (see
5.2).
5.1.2 Operation of an enabling switch
Subclause 4.1.2 of IEC 60947-5-1:2016 applies.
5.2 Type of three-position enabling switch
5.2.1 Number of poles
The number of poles shall be stated by the manufacturer.
5.2.2 Kind of current
Alternating current or direct current.
5.3 Rated and limiting values for switching elements
Subclause 4.3 of IEC 60947-5-1:2016 applies.
5.4 Utilization categories for switching elements
Subclause 4.4 of IEC 60947-5-1:2016 applies.
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5.5 Vacant
5.6 Vacant
5.7 Vacant
5.8 Vacant
5.9 Vacant
5.10 Electrically separated contact elements
Subclause 4.10 of IEC 60947-5-1:2016 applies.
6 Product information
6.1 Nature of information
The following information shall be given by the manufacturer:
Identification
a) The manufacturer's name or trade mark.
b) A type designation or serial number that makes it possible to get the relevant information
concerning the switching element (or the entire control switch) from the manufacturer.
c) “IEC 60947-5-8” if the manufacturer claims compliance with this document.
d) Three-position enabling switches shall be indelibly and legibly marked by the following
symbol:
NOTE If it is not possible to affix the marking to the switch due to size constraints, then the symbol can be put in
the instructions for installation, operation and maintenance.
Basic rated values and utilization
e) Actuating forces and travel of the actuator.
f) Rated operational voltage(s) (see 4.3.2.2 of IEC 60947-5-1:2016).
g) Utilization category and rated operational currents at the rated operational voltages of the
switching element.
h) Rated insulation voltage (see 4.3.2.3 of IEC 60947-5-1:2016).
i) Rated impulse withstand voltage U in accordance with 5.3.1.3 of IEC 60947-1:2020.
imp
j) IP code (see Annex C of IEC 60947-1:2020).
k) Pollution degree (see 6.1.3.2 of IEC 60947-5-1:2016).
l) Type and maximum ratings of short-circuit protective device (see 8.3.4.3 of
IEC 60947-5-1:2016).
m) Conditional short-circuit current if less than 1 000 A.
n) Indication of contact elements of same polarity.
o) Mechanical and/or electrical durability.
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SIST EN IEC 60947-5-8:2021
IEC 60947-5-8:2020 © IEC 2020 – 9 –
6.2 Marking
6.2.1 General
Marking of data specified in items a), b), c) and d) of 6.1 is mandatory on the nameplate of
the three-position enabling switch in order to permit the complete information to be obtained
from the manufacturer.
Marking shall be indelible and easily legible, and shall not be placed on screws and easily
removable parts.
Whenever space permits, data under items e) to o) of 6.1 shall be included on the nameplate,
or on the three-position enabling switch or otherwise in the manufacturer's published literature.
6.2.2 Terminal identification and marking
Subclause 5.2.2 of IEC 60947-5-1:2016 applies.
6.2.3 Functional markings
To avoid confusion with emergency stop devices, the actuator of an enabling switch shall not
be coloured red (see IEC 60204-1).
6.3 Instructions for installation, operation and maintenance
Subclause 6.3 of IEC 60947-1:2020 applies with the following additions.
Manufacturers are encouraged to use graphical symbols as set out in international standards.
Examples include ISO 7000 and IEC 60417.
EXAMPLE Following symbols can be used for “skilled person”.
IEC 60417-6182 (2013-09) IEC 60417-6183 (2013-09)
Installation, electrotechnical expertise Installation, mechanical expertise
6.4 Additional information
Subclause 5.4 of IEC 60947-5-1:2016 applies.
7 Normal service, mounting and transport conditions
7.1 General
Clause 7 of IEC 60947-1:2020 applies with the following additions.
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SIST EN IEC 60947-5-8:2021
– 10 – IEC 60947-5-8:2020 © IEC 2020
7.1.3.2 Pollution degree
An enabling switch is intended for installation under environmental conditions of pollution
degree 3. If it can be demonstrated that the micro-environment of a device to which the
enabling switch (or part of) is exposed is different to pollution degree 3, then the pollution
degree of the enabling switch can be
...
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