EN IEC 60947-5-1:2025
(Main)Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching elements - Electromechanical control circuit devices
Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching elements - Electromechanical control circuit devices
IEC 60947-5-1:2024 applies to control circuit devices and switching elements intended for controlling, signalling, interlocking, etc., of switchgear and controlgear. It applies to control circuit devices having a rated voltage not exceeding 1 000 V AC (at a frequency not exceeding 1 000 Hz) or 600 V DC. This fifth edition cancels and replaces the fourth edition published in 2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) update of the scope structure and exclusions; b) requirements for control circuits; c) update of the normal service conditions (e.g. shock and vibration); d) update of information and marking requirements including environmental information requirements referencing IEC TS 63058:2021; e) update of the constructional requirements and the corresponding tests considering safety aspects (e.g. artificial optical radiation, security aspects, limited energy source, stored charge energy circuit); f) update of the EMC requirements according to the generic documents; g) new requirements for reed contact magnetic switches in Annex D; h) requirements for class II circuit devices achieved by double or reinforced insulation in Annex F; i) update of pull-out tests in Annex G; j) information requirements for audible signalling device in Annex J; k) insertion of new Annex O.
Niederspannungsschaltgeräte - Teil 5-1: Steuergeräte und Schaltelemente - Elektromechanische Steuergeräte
Appareillage à basse tension - Partie 5-1: Appareils et éléments de commutation pour circuits de commande - Appareils électromécaniques pour circuits de commande
L'IEC 60947-5-1:2024 s'applique aux appareils pour circuits de commande et aux éléments de commutation destinés à la commande, à la signalisation, au verrouillage, etc., de l'appareillage. Elle s'applique aux appareils pour circuits de commande dont la tension assignée ne dépasse pas 1 000 V en courant alternatif (à une fréquence qui ne dépasse pas 1 000 Hz) ou 600 V en courant continu. Cette cinquième édition annule et remplace la quatrième édition parue en 2016. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) mise à jour de la structure du domaine d'application et des exclusions; b) exigences pour les circuits de commande; c) mise à jour des conditions normales d'emploi (chocs et vibrations, par exemple); d) mise à jour des exigences relatives aux informations et eu marquage, y compris les exigences concernant les informations relatives à l'environnement qui font référence à l'IEC TS 63058:2021; e) mise à jour des exigences de construction et des essais correspondants compte tenu des considérations de sûreté (par exemple rayonnement otique artificiel, aspects relatifs à la sécurité, source d'énergie limitée, circuit d'énergie de charge emmagasinée); f) mise à jour des exigences de CEM conformément aux documents génériques; g) nouvelles exigences pour les interrupteurs magnétiques à lames souples à l'Annexe D; h) exigences relatives aux appareils de classe II pour circuits respectées par une double isolation ou une isolation renforcée à l'Annexe F; i) mise à jour des essais de traction à l'Annexe G; j) exigences relatives aux informations concernant les dispositifs de signalisation sonore à l'Annexe J; k) insertion d'une nouvelle Annexe O. La version française de cette norme n'a pas été soumise au vote.
Nizkonapetostne stikalne in krmilne naprave - 5-1. del: Krmilne naprave in stikalni elementi - Elektromehanske krmilne naprave (IEC 60947-5-1:2024)
Ta del standarda IEC 60947 se uporablja za krmilne naprave in stikalne elemente za krmiljenje, signalizacijo, spajanje itd. stikalnih in krmilnih naprav.
Uporablja se za krmilne naprave, katerih nazivna napetost ne presega 1000 V AC (pri največji frekvenci 1000 Hz) oziroma 600 V DsC.
Ta dokument se uporablja za posebne vrste krmilnih naprav, ki so okvirno navedene na spodnjem seznamu:
– ročno upravljana krmilna stikala; – elektromagnetna krmilna stikala, zakasnitvena ali trenutna; – releji kontaktorjev; – avtomatična krmilna stikala; – tlačna stikala; – temperaturno občutljiva stikala (termostati); – programatorji; – položajna stikala; – krmilna stikala, ki se upravljajo z delom stroja ali mehanizmom; – povezana oprema za tokokroge, na primer indikatorske luči itd.; – krmilne naprave s polprevodniškimi stikalnimi elementi; – krmilne naprave z vgrajenim enožičnim digitalnim komunikacijskim vmesnikom.
OPOMBA 1: Krmilne naprave in stikalni elementi se v tem dokumentu enakovredno imenujejo »oprema« oziroma »naprava«.
Ta dokument se uporablja tudi za posebne vrste stikalnih elementov krmilnih naprav, povezanih z drugimi napravami (njihove glavne tokokroge zajemajo drugi standardi), ki so navedene na spodnjem neizčrpnem seznamu:
– kontakti stikalne naprave (npr. kontaktor, odklopnik itd.), ki niso namenjeni izključno za uporabo s tuljavo te naprave; – kontakti za spajanje ogradnih vrat; – kontakti tokokrogov vrtljivih stikal; – kontakti tokokrogov preobremenitvenih relejev.
Ta dokument se ne uporablja za:
– releje, zajete v skupini standardov IEC 60255 ali IEC 61810; – samodejne električne krmilne naprave za gospodinjske in podobne namene; – uporabo krmilnih naprav in stikalnih elementov z uvedbo dodatnih ukrepov v eksplozivnih okoljih. To je podano v skupini standardov IEC 60079. Ta dokument ne obravnava posebnih zahtev glede barv ali vrednosti aktivacijske sile.
OPOMBA 2: Zahteve glede barv so podane v standardih IEC 60073 in CIE S004/E-2001.
Cilj tega dokumenta je navesti:
– definicije; – razvrstitev; – lastnosti; – informacije o izdelku; – običajne pogoje uporabe, montaže in transporta; – konstrukcijske in izvedbene zahteve, vključno z elektromagnetno združljivostjo (EMC) in vsemi povezanimi ukrepi za varnost izdelka; – preskuse za preverjanje zahtev in nazivnih lastnosti.
General Information
- Status
- Published
- Publication Date
- 24-Apr-2025
- Technical Committee
- CLC/TC 121A - Low-voltage switchgear and controlgear
- Drafting Committee
- IEC/SC 121A - Low-voltage switchgear and controlgear
- Current Stage
- 6060 - Document made available - Publishing
- Start Date
- 25-Apr-2025
- Completion Date
- 25-Apr-2025
Relations
- Effective Date
- 30-Nov-2021
- Effective Date
- 05-Nov-2019
Overview
EN IEC 60947-5-1:2025 (IEC 60947-5-1:2024) is the fifth edition of the international standard for electromechanical control circuit devices used with low-voltage switchgear and controlgear. It specifies safety, constructional, marking and test requirements for control circuit devices and switching elements intended for controlling, signalling, interlocking and similar functions. The standard applies to devices with rated voltages up to 1 000 V AC (≤1 000 Hz) or 600 V DC and replaces the 2016/2018 editions as a technical revision.
Key Topics and Technical Requirements
- Scope and exclusions - updated structure clarifying which control circuit devices are covered.
- Control circuit requirements - functional and safety requirements for circuits used in control, signalling and interlocking.
- Normal service conditions - revised environmental and mechanical conditions (e.g., shock and vibration) for reliability and lifetime assessment.
- Constructional safety and tests - enhanced tests and requirements addressing safety aspects such as artificial optical radiation, limited energy sources and stored charge energy circuits.
- EMC requirements - aligned with generic EMC documents and immunity/emission test standards (IEC/EN 61000 series).
- Marking and information - updated marking and environmental information requirements, referencing IEC TS 63058:2021.
- New and revised Annexes - additions and updates including:
- Reed contact magnetic switches (Annex D)
- Class II circuit devices with double/reinforced insulation (Annex F)
- Pull-out tests (Annex G)
- Audible signalling device information (Annex J)
- New Annex O and other informative/normative annexes
- Normative references - integrates related IEC documents (e.g., IEC 60947-1, IEC 60947-4-1, IEC 60947-5-2) and EMC, environmental and safety test standards.
Practical Applications and Who Uses This Standard
SIST EN IEC 60947-5-1 is essential for:
- Manufacturers of low-voltage control devices (pilot switches, contactor relays, indicator lights, audible signalling devices, reed and proximity-related components)
- Product designers and R&D teams ensuring compliant electrical, mechanical and EMC design
- Test laboratories and conformity assessment bodies performing type tests and verification
- Electrical installers and panel builders specifying compliant components for control panels, motor control centres and industrial automation
- Regulatory and compliance engineers applying the Low Voltage Directive and product safety requirements in EU/EFTA markets
Related Standards
Relevant companion standards and series referenced include:
- IEC 60947-1 (General rules for low-voltage switchgear and controlgear)
- IEC 60947-4-1 (Contactors and motor-starters)
- IEC 60947-5-2 (Proximity switches)
- IEC 61000 series (EMC testing and immunity)
- IEC 62471 (Photobiological safety)
This standard provides a presumption of conformity with applicable safety objectives when properly applied - a key reference for compliant, safe and robust low-voltage control circuit device design and testing.
Frequently Asked Questions
EN IEC 60947-5-1:2025 is a standard published by CLC. Its full title is "Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching elements - Electromechanical control circuit devices". This standard covers: IEC 60947-5-1:2024 applies to control circuit devices and switching elements intended for controlling, signalling, interlocking, etc., of switchgear and controlgear. It applies to control circuit devices having a rated voltage not exceeding 1 000 V AC (at a frequency not exceeding 1 000 Hz) or 600 V DC. This fifth edition cancels and replaces the fourth edition published in 2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) update of the scope structure and exclusions; b) requirements for control circuits; c) update of the normal service conditions (e.g. shock and vibration); d) update of information and marking requirements including environmental information requirements referencing IEC TS 63058:2021; e) update of the constructional requirements and the corresponding tests considering safety aspects (e.g. artificial optical radiation, security aspects, limited energy source, stored charge energy circuit); f) update of the EMC requirements according to the generic documents; g) new requirements for reed contact magnetic switches in Annex D; h) requirements for class II circuit devices achieved by double or reinforced insulation in Annex F; i) update of pull-out tests in Annex G; j) information requirements for audible signalling device in Annex J; k) insertion of new Annex O.
IEC 60947-5-1:2024 applies to control circuit devices and switching elements intended for controlling, signalling, interlocking, etc., of switchgear and controlgear. It applies to control circuit devices having a rated voltage not exceeding 1 000 V AC (at a frequency not exceeding 1 000 Hz) or 600 V DC. This fifth edition cancels and replaces the fourth edition published in 2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) update of the scope structure and exclusions; b) requirements for control circuits; c) update of the normal service conditions (e.g. shock and vibration); d) update of information and marking requirements including environmental information requirements referencing IEC TS 63058:2021; e) update of the constructional requirements and the corresponding tests considering safety aspects (e.g. artificial optical radiation, security aspects, limited energy source, stored charge energy circuit); f) update of the EMC requirements according to the generic documents; g) new requirements for reed contact magnetic switches in Annex D; h) requirements for class II circuit devices achieved by double or reinforced insulation in Annex F; i) update of pull-out tests in Annex G; j) information requirements for audible signalling device in Annex J; k) insertion of new Annex O.
EN IEC 60947-5-1:2025 is classified under the following ICS (International Classification for Standards) categories: 29.120.40 - Switches; 29.130.20 - Low voltage switchgear and controlgear. The ICS classification helps identify the subject area and facilitates finding related standards.
EN IEC 60947-5-1:2025 has the following relationships with other standards: It is inter standard links to EN 60947-5-1:2017/AC:2020-05, EN 60947-5-1:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN IEC 60947-5-1:2025 is associated with the following European legislation: EU Directives/Regulations: 2014/30/EU, 2014/35/EU; Standardization Mandates: M/511, M/552. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN IEC 60947-5-1:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2025
Nadomešča:
SIST EN 60947-5-1:2018
SIST EN 60947-5-1:2018/AC:2020
Nizkonapetostne stikalne in krmilne naprave - 5-1. del: Krmilne naprave in stikalni
elementi - Elektromehanske krmilne naprave (IEC 60947-5-1:2024)
Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching
elements - Electromechanical control circuit devices (IEC 60947-5-1:2024)
Niederspannungsschaltgeräte - Teil 5-1: Steuergeräte und Schaltelemente -
Elektromechanische Steuergeräte (IEC 60947-5-1:2024)
Appareillage à basse tension - Partie 5-1: Appareils et éléments de commutation pour
circuits de commande - Appareils électromécaniques pour circuits de commande (IEC
60947-5-1:2024)
Ta slovenski standard je istoveten z: EN IEC 60947-5-1:2025
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60947-5-1
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2025
ICS 29.120.40; 29.130.20 Supersedes EN 60947-5-1:2017; EN 60947-5-
1:2017/AC:2020-05
English Version
Low-voltage switchgear and controlgear - Part 5-1: Control
circuit devices and switching elements - Electromechanical
control circuit devices
(IEC 60947-5-1:2024)
Appareillage à basse tension - Partie 5-1: Appareils et Niederspannungsschaltgeräte - Teil 5-1: Steuergeräte und
éléments de commutation pour circuits de commande - Schaltelemente - Elektromechanische Steuergeräte
Appareils électromécaniques pour circuits de commande (IEC 60947-5-1:2024)
(IEC 60947-5-1:2024)
This European Standard was approved by CENELEC on 2025-02-26. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-5-1:2025 E
European foreword
The text of document 121A/585/FDIS, future edition 5 of IEC 60947-5-1, 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) 2026-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-04-30
document have to be withdrawn
This document supersedes EN 60947-5-1:2017 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
For the relationship with EU Legislation, see informative Annex ZZ, which is 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 60947-5-1:2024 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 60068-2-75:2014 NOTE Approved as EN 60068-2-75:2014 (not modified)
IEC 60073:2002 NOTE Approved as EN 60073:2002 (not modified)
IEC 60079 (series) NOTE Approved as EN IEC 60079-7 (series)
IEC 60255 (series) NOTE Approved as EN 60255 (series)
IEC 60947-5-3:2013 NOTE Approved as EN 60947-5-3:2013 (not modified)
IEC 60947-5-4:2002 NOTE Approved as EN 60947-5-4:2003 (not modified)
IEC 61000 (series) NOTE Approved as EN IEC 61000 (series)
IEC 61810 (series) NOTE Approved as EN 61810 (series)
IEC 61672-1:2013 NOTE Approved as EN 61672-1:2013 (not modified)
IEC 62246-1:2015 NOTE Approved as EN 62246-1:2015 (not modified)
IEC 62246-1-1:2018 NOTE Approved as EN IEC 62246-1-1:2018 (not modified)
IEC 62246-4:2023 NOTE Approved as EN IEC 62246-4:2023 (not modified)
IEC 62443 (series) NOTE Approved as EN IEC 62443 (series)
IEC/TR 63201:2019 NOTE Approved as CLC IEC/TR 63201:2020 (not modified)
ISO 7731:2003 NOTE Approved as EN ISO 7731:2008 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-6 2007 Environmental testing - Part 2-6: Tests - Test EN 60068-2-6 2008
Fc: Vibration (sinusoidal)
IEC 60068-2-14 2023 Environmental testing - Part 2-14: Tests - EN IEC 60068-2-14 2023
Test N: Change of temperature
IEC 60068-2-27 2008 Environmental testing - Part 2-27: Tests - EN 60068-2-27 2009
Test Ea and guidance: Shock
IEC 60068-2-30 2005 Environmental testing - Part 2-30: Tests - EN 60068-2-30 2005
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60068-2-78 2012 Environmental testing – Part 2-78: Tests – EN 60068-2-78 2013
Test Cab: Damp heat, steady state
IEC 60695-2-10 2021 Fire hazard testing - Part 2-10: Glowing/hot- EN IEC 60695-2-10 2021
wire based test methods - Glow-wire
apparatus and common test procedure
+ AC 2024
IEC 60695-2-11 2021 Fire hazard testing - Part 2-11: Glowing/hot- EN IEC 60695-2-11 2021
wire based test methods - Glow-wire
flammability test method for end-products
(GWEPT)
IEC 60695-2-12 2021 Fire hazard testing – Part 2-12: Glowing/hot- EN IEC 60695-2-12 2021
wire based test methods – Glow-wire
flammability index (GWFI) test method for
materials
IEC 60730-1 2022 Automatic electrical controls - Part 1: General EN 60730-1 2016
requirements
+ A1 2019
+ A2 2022
Publication Year Title EN/HD Year
IEC 60947-1 2020 Low-voltage switchgear and controlgear - EN IEC 60947-1 2021
Part 1: General rules
+ AC 2023
+ AC 2024
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
+ AC 2021
IEC 60947-5-2 2019 Low-voltage switchgear and controlgear - EN IEC 60947-5-2 2020
Part 5-2: Control circuit devices and switching
elements - Proximity switches
IEC 60947-5-5 1997 Low-voltage switchgear and controlgear -- EN 60947-5-5 1997
Part 5-5: Control circuit devices and switching
elements - Electrical emergency stop device
with mechanical latching function
+ A1 2005 + A1 2005
- - + A11 2013
+ A2 2016 + A2 2017
IEC 60999-1 1999 Connecting devices - Electrical copper EN 60999-1 2000
conductors - Safety requirements for screw-
type and screwless-type clamping units --
Part 1: General requirements and particular
requirements for clamping units for
conductors from 0,2 mm² up to 35 mm²
(included)
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) -- Part EN 61000-4-2 2009
4-2: Testing and measurement techniques -
Electrostatic discharge immunity test
IEC 61000-4-3 2020 Electromagnetic compatibility (EMC) -- Part EN IEC 61000-4-3 2020
4-3: Testing and measurement techniques -
Radiated, radio-frequency, electromagnetic
field immunity test
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) -- Part EN 61000-4-4 2012
4-4: Testing and measurement techniques -
Electrical fast transient/burst immunity test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - Part 4- EN 61000-4-5 2014
5: Testing and measurement techniques -
Surge immunity test
+ A1 2017 + A1 2017
IEC 61000-4-6 2023 Electromagnetic compatibility (EMC) -- Part EN IEC 61000-4-6 2023
4-6: Testing and measurement techniques -
Immunity to conducted disturbances, induced
by radio-frequency fields
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) -- Part EN 61000-4-8 2010
4-8: Testing and measurement techniques -
Power frequency magnetic field immunity test
Publication Year Title EN/HD Year
IEC 61000-4-11 2020 Electromagnetic compatibility (EMC) -- Part EN IEC 61000-4-11 2020
4-11: Testing and measurement techniques -
Voltage dips, short interruptions and voltage
variations immunity tests
+ AC 2020
+ AC 2022
IEC 61131-9 2022 Programmable controllers - Part 9: Single- EN IEC 61131-9 2022
drop digital communication interface for small
sensors and actuators (SDCI)
IEC 61140 2016 Protection against electric shock - Common EN 61140 2016
aspects for installation and equipment
IEC 62262 2002 Degrees of protection provided by enclosures EN 62262 2002
for electrical equipment against external
mechanical impacts (IK code)
+ A1 2021
IEC 62471 2006 Photobiological safety of lamps and lamp EN 62471 2008
systems
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment - EN 55011 2016
Radio-frequency disturbance characteristics -
Limits and methods of measurement
+ A1 2016 + A1 2017
- - + A11 2020
+ A2 2019 + A2 2021
CISPR 32 2015 Electromagnetic compatibility of multimedia EN 55032 2015
equipment - Emission requirements
+ AC 2016
+ A1 2019 + A1 2020
- - + A11 2020
ISO 2859-1 1999 Sampling procedures for inspection by - -
attributes – Part 1: Sampling schemes
indexed by acceptance quality limit AQL) for
lot-by-lot inspection
ISO 14159 2002 Safety of machinery – Hygiene requirements EN ISO 14159 2008
for the design of machinery
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]
Clause(s) / sub-clause(s)
Safety objectives of
Remarks / Notes
Directive 2014/35/EU
of this EN
(1)(a) 6.1 d) to w), 6.2, 6.3,
8.1, Annex D, Annex F, Annex H,
Annex J, Annex K, Annex L, Annex M,
Annex N
(1)(b) 6.1 d) to w), 6.3, 6.5, Clause 7, 8.1, 8.2,
9.1, 9.2, 9.3, Annex C, Annex D,
Annex F, Annex J
(1)(c) 6.1 d) to w), 6.2, 6.3, 6.5
See also references given in (2)(a) to
(2)(d) and (3)(a) to (3)(c) in this Table.
(2)(a) 6.1 d) to v), 6.3, 6.5, 8.1, 8.2, 9.2, 9.3,
Annex D, Annex F
(2)(b) 8.1, 8.2, 9.2, 9.3, Annex G, Annex H,
Annex J
(2)(c) 6.1 w), 6.3, 6.5, 8.1, 8.2, 9.1, 9.2, 9.3,
Annex C, Annex D, Annex J, Annex N
(2)(d) 6.1 i), j), 6.3, 6.5, Clause 7, 8.1, 8.2, 8.4,
9.2, 9.3, Annex D, Annex F, Annex J
(3)(a) 6.1 g), m), 6.3, 6.5, Clause 7, 8.1, 8.2,
8.4, 9.1, 9.2, 9.3, Annex C, Annex D,
Annex F, Annex G, Annex J
(3)(b) 6.1 m), n), 6.3, 6.5, Clause 7, 8.1, 8.2,
8.3, 9.3, 9.4, Annex D, Annex F,
Annex N, Annex K
Clause(s) / sub-clause(s)
Safety objectives of
Remarks / Notes
Directive 2014/35/EU
of this EN
(3)(c) 6.1 e), o), p), 6.3, 6.5, 8.1, 8.2, 9.2, 9.3,
Annex D, Annex H, Annex J, Annex K,
Annex N
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 60947-5-1 ®
Edition 5.0 2024-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low- voltage switchgear and controlgear –
Part 5-1: Control circuit devices and switching elements – Electromechanical
control circuit devices
Appareillage à basse tension –
Partie 5-1: Appareils et éléments de commutation pour circuits de commande –
Appareils électromécaniques pour circuits de commande
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.40, 29.130.20 ISBN 978-2-8322-8326-4
– 2 – IEC 60947-5-1:2024 © IEC 2024
CONTENTS
FOREWORD . 9
1 Scope . 11
2 Normative references . 12
3 Terms, definitions, symbols and abbreviated terms . 14
3.1 Terms and definitions . 14
3.1.1 General . 14
3.1.2 Basic terms and definitions . 14
3.1.3 Terms and definitions concerning automatic control switches . 16
3.1.4 Terms and definitions concerning manually operated control switches . 16
3.1.5 Terms and definitions concerning parts of control switches . 18
3.1.6 Terms and definitions concerning operation of contactor relays . 21
3.1.7 Terms and definitions concerning operation of pilot switches . 21
3.1.8 Terms and definitions concerning operation of rotary switches. 22
3.1.9 Terms and definitions concerning operation of mechanically operated
control switches . 22
3.1.10 Terms and definitions concerning reed contact magnetic switches . 25
3.1.11 Terms and definitions concerning Class II control circuit devices . 26
3.1.12 Terms and definitions concerning control circuit devices with integrally
connected cables . 26
3.1.13 Terms and definitions concerning semiconductor switching elements . 27
3.1.14 Terms and definitions concerning indicator lights, indicating towers and
audible signalling devices . 27
3.1.15 Terms and definitions concerning control switches with direct opening
action . 28
3.1.16 Terms and definitions concerning digital communication interface . 28
3.1.17 Alphabetical index of definitions. 29
3.2 Symbols and abbreviated terms . 33
4 Classification . 33
4.1 Contact elements . 33
4.2 Control switches . 35
4.3 Control circuit devices . 35
4.4 Time delay switching elements. 35
4.5 Control switch mounting . 35
5 Characteristics . 35
5.1 Summary of characteristics . 35
5.1.1 General . 35
5.1.2 Operation of a control switch . 35
5.2 Type of control circuit device or switching element . 36
5.2.1 Kind of control circuit device . 36
5.2.2 Kind of switching elements . 36
5.2.3 Number of poles . 36
5.2.4 Kind of current . 36
5.2.5 Interrupting medium . 36
5.2.6 Operating conditions . 37
5.3 Rated and limiting values for switching elements . 37
5.3.1 General . 37
5.3.2 Rated voltages (of a switching element). 37
IEC 60947-5-1:2024 © IEC 2024 – 3 –
5.3.3 Currents . 37
5.3.4 Rated frequency . 38
5.3.5 Vacant . 38
5.3.6 Characteristics under normal and abnormal load conditions . 38
5.3.7 Short-circuit characteristics – Rated conditional short-circuit current . 40
5.4 Utilization categories for switching elements . 40
5.5 Control circuits . 40
5.6 Vacant . 41
5.7 Vacant . 41
5.8 Vacant . 41
5.9 Vacant . 41
5.10 Electrically separated contact elements . 41
5.11 Actuating quantities for pilot switches . 41
5.12 Pilot switches having two or more contact elements . 41
6 Product information . 41
6.1 Nature of information . 41
6.2 Marking . 43
6.2.1 General . 43
6.2.2 Terminal identification and marking . 43
6.2.3 Functional markings. 43
6.2.4 Emergency stop . 43
6.2.5 Operating diagram . 43
6.2.6 Time delay markings . 44
6.3 Instructions for installation, operation and maintenance, decommissioning
and dismantling. 45
6.4 Environmental information . 45
6.4.1 Environmentally conscious design process (ECD process) . 45
6.4.2 Procedure to establish material declaration . 45
6.5 Additional information . 45
7 Normal service, mounting and transport conditions . 46
7.1 Normal service conditions . 46
7.1.1 Ambient air temperature . 46
7.1.2 Altitude . 46
7.1.3 Atmospheric conditions . 46
7.1.4 Shock and vibration . 46
7.2 Conditions during transport and storage . 46
7.3 Mounting . 46
7.3.1 General . 46
7.3.2 Mounting of single hole mounted devices . 46
8 Constructional and performance requirements . 48
8.1 Constructional requirements . 48
8.1.1 General . 48
8.1.2 Materials . 48
8.1.3 Current-carrying parts and their connections . 49
8.1.4 Clearances and creepage distances . 49
8.1.5 Actuator . 49
8.1.6 Indication of the contact position . 50
8.1.7 Conditions for control switches suitable for isolation . 50
8.1.8 Terminals . 50
– 4 – IEC 60947-5-1:2024 © IEC 2024
8.1.9 Vacant . 50
8.1.10 Provisions for protective earthing . 50
8.1.11 Enclosures for equipment . 50
8.1.12 Degrees of protection of enclosed equipment . 50
8.1.13 Conduit pull-out, torque and bending with metallic conduits . 50
8.1.14 Requirements for control circuit devices with artificial optical radiation . 50
8.1.15 Biological and chemical effects . 51
8.1.16 Hygienic design . 51
8.1.17 Security aspects . 51
8.1.18 Limited energy source . 51
8.1.19 Fault and abnormal conditions . 53
8.1.20 Stored charge energy circuit . 54
8.1.21 Embedded software . 54
8.2 Performance requirements . 54
8.2.1 Operating conditions . 54
8.2.2 Temperature-rise . 54
8.2.3 Dielectric properties . 54
8.2.4 Ability to make and break under normal and abnormal load conditions. 54
8.2.5 Conditional short-circuit current . 55
8.2.6 Vacant . 55
8.2.7 Additional requirements for control switches suitable for isolation . 55
8.3 Electromagnetic compatibility (EMC) . 55
8.3.1 General . 55
8.3.2 Immunity . 56
8.3.3 Emission . 56
8.4 Special requirements . 56
8.4.1 Additional requirements for reed contact magnetic switches . 56
8.4.2 Class II control circuit devices . 57
8.4.3 Additional requirements for control circuit devices with integrally
connected cables . 57
8.4.4 Additional requirements for semiconductor switching elements for
control circuit devices . 57
8.4.5 Special requirements for indicator lights, indicating towers and their
optional audible functions . 57
8.4.6 Special requirements for control switches with direct opening action . 57
8.4.7 Special requirements for mechanically linked contact elements . 57
8.4.8 Additional requirements for control circuit devices incorporating a built-
in communication interface (SDCI) . 57
9 Tests . 57
9.1 Kinds of test . 57
9.1.1 General . 57
9.1.2 Type tests . 57
9.1.3 Routine tests . 58
9.1.4 Sampling tests . 58
9.1.5 Special tests . 58
9.2 Compliance with constructional requirements . 59
9.2.1 General . 59
9.2.2 Test of materials to abnormal heat and fire . 59
9.2.3 Equipment . 59
9.2.4 Degrees of protection . 59
IEC 60947-5-1:2024 © IEC 2024 – 5 –
9.2.5 Mechanical and electrical properties of terminals . 60
9.2.6 Verification of actuating force (or torque) . 62
9.2.7 Verification of limitation of rotation (of a rotary switch) . 62
9.2.8 Conduit pull-out test, torque test and bending test with metallic conduits . 62
9.2.9 Test of earth continuity for protective earth . 62
9.2.10 Limited energy source test . 62
9.2.11 Breakdown of components . 63
9.2.12 Artificial optical radiation test . 63
9.2.13 Stored charge energy test . 64
9.3 Performance . 64
9.3.1 Test sequences . 64
9.3.2 General test conditions . 65
9.3.3 Performance under no-load, normal load and abnormal load conditions . 66
9.3.4 Performance under conditional short-circuit current . 70
9.4 Tests for EMC . 72
9.4.1 General . 72
9.4.2 Immunity . 72
9.4.3 Emission . 74
9.4.4 Test results and test report . 75
Annex A (normative) Electrical ratings based on utilization categories (see 4.1) . 76
Annex B (informative) Example of inductive test loads for DC contacts . 78
B.1 General . 78
B.2 Construction . 78
Annex C (normative) Special tests – Durability tests . 80
C.1 General . 80
C.1.1 Durability declaration . 80
C.1.2 Test procedures . 80
C.1.3 Failure criteria . 80
C.2 Mechanical durability . 81
C.2.1 General . 81
C.2.2 Test procedures . 81
C.3 Electrical durability . 81
C.3.1 General . 81
C.3.2 Test procedures . 81
Annex D (normative) Additional requirements for reed contact magnetic switches . 84
Annex E (informative) Items subject to agreement between manufacturer and user . 87
Annex F (normative) Class II control circuit devices – Requirements and tests . 88
Annex G (normative) Additional requirements for control circuit devices with integrally
connected cables . 93
Annex H (normative) Additional requirements for semiconductor switching elements
for control circuit devices . 97
Annex I (informative) . 103
Annex J (normative) Special requirements for indicator lights, indicating towers and
audible signalling devices . 104
Annex K (normative) Special requirements for control switches with direct opening
action. 110
Annex L (normative) Special requirements for mechanically linked contact elements . 115
– 6 – IEC 60947-5-1:2024 © IEC 2024
Annex M (normative) Terminal marking, distinctive number and distinctive letter for
control circuit devices . 118
M.1 General . 118
M.2 Terminal marking rule . 118
M.2.1 General . 118
M.2.2 Function digit . 118
M.2.3 Sequence digit . 118
M.2.4 Numbering method . 119
M.3 Distinctive number and distinctive letter . 119
M.3.1 General . 119
M.3.2 Distinctive number . 119
M.3.3 Distinctive letter . 119
M.4 Terminal numbering sequence . 120
M.5 Contactor relays designated by the distinctive letter E . 120
M.6 Contactor relays designated by distinctive letters X, Y or Z . 122
M.6.1 Contactor relays designated by the distinctive letter Z . 122
M.6.2 Contactor relays designated by the distinctive letter X . 122
M.6.3 Contactor relays designated by the distinctive letter Y . 122
Annex N (normative) Procedure to determine reliability data for electromechanical
devices in control circuits used in functional safety applications . 123
N.1 General . 123
N.1.1 Overview . 123
N.1.2 Object . 123
N.1.3 General requirements . 123
N.2 Terms, definitions and symbols . 123
N.3 Method based on durability test results . 123
N.3.1 General method . 123
N.3.2 Test requirements . 123
N.3.3 Number of samples . 124
N.3.4 Characterization of a failure mode . 124
N.3.5 Weibull modelling . 124
N.3.6 Useful life and upper limit of failure rate . 124
N.3.7 Reliability data . 124
N.4 Data information . 124
N.5 Example. 124
Annex O (normative) Additional requirements for control circuit devices incorporating
a built-in communication interface complying with IEC 61131-9 . 125
Bibliography . 127
Figure 1 – Operation of push-buttons . 23
Figure 2 – Difference e between the over-travel of the actuator and that of the contact
element. 23
Figure 3 – Examples of contact elements (schematic sketches) . 34
Figure 4 – Examples of the recommended method for drawing an operating diagram of
a rotary switch . 44
Figure 5 – Mounting hole diameter and dimensions of the key recess (if any) . 47
Figure 6 – Voltage drop measurement at contact point of the clamping unit or terminal . 61
Figure 7 – Test circuits for multi-pole control switches – Contacts of same polarity, not
electrically separated . 68
IEC 60947-5-1:2024 © IEC 2024 – 7 –
Figure 8 – Test circuits for multi-pole control switches – Electrically separated . 68
Figure 9 – Load L details for test conditions requiring different values of make and
d
break current and/or power factor (time constant) . 69
Figure 10 – Current/time limits for DC test loads . 69
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Die Norm EN IEC 60947-5-1:2025 befasst sich ausführlich mit Schaltgeräten und Steuerungen für Niederspannungs-Schaltanlagen und ist ein wichtiger Bestandteil für die Sicherheit und Effizienz elektrischer Installationen. Der Anwendungsbereich dieser Norm ist klar definiert und umfasst Steuergeräte und Schaltelemente, die für das Steuern, Signalisieren und Verriegeln von Schaltanlagen und Steuerungen vorgesehen sind, mit einer Nennspannung von bis zu 1 000 V AC oder 600 V DC. Eine der größten Stärken dieser Norm liegt in der umfassenden Aktualisierung im Vergleich zur vorherigen Auflage von 2016. Die technischen Änderungen betreffen wesentliche Aspekte der Norm, einschließlich einer klaren Struktur für den Anwendungsbereich und spezifischen Ausschlüssen, die die Benutzerfreundlichkeit und die Sicherheit erhöhen. Die Anforderungen für Steuerkreise wurden definiert und präzisiert, um zeitgemäße Standards in der Technologie zu gewährleisten. Darüber hinaus wurden die normalen Betriebsbedingungen überarbeitet, was insbesondere für die Bereiche Schock und Vibration wichtig ist, da dies sicherstellt, dass die Geräte unter realistischen Bedingungen getestet werden. Besonders hervorzuheben sind die aktualisierten Informationen und Kennzeichnungsanforderungen, die Referenzen auf Umweltinformationen gemäß IEC TS 63058:2021 beinhalten. Dies unterstreicht das Engagement der Norm, den ökologischen Fußabdruck zu berücksichtigen. Die sicherheitstechnischen Anforderungen sind ebenfalls umfassend verbessert worden, einschließlich spezifischer Tests für künstliche optische Strahlung und Sicherheitsaspekte, die den Schutz von Benutzern und Anlagen gewährleisten sollen. Die überarbeiteten EMC-Anforderungen gemäß den allgemeinen Dokumenten sowie die neuen Anforderungen für Reed-Kontakt-Magnet-Schalter im Anhang D bieten zusätzliche Sicherheit und Flexibilität für Anwender. Die Norm bietet auch Anforderungen für Geräte der Klasse II, die durch doppelte oder verstärkte Isolation in Anhang F realisiert werden, sowie aktualisierte Anforderungen an Ausziehtests in Anhang G. Besonders nützlich sind die Informationen über akustische Signalisierungsgeräte im Anhang J, die sicherstellen, dass akustische Warnungen korrekt und zuverlässig sind. Insgesamt ist die EN IEC 60947-5-1:2025 von zentraler Bedeutung für die Entwicklung und Anwendung von Niederspannungsschaltgeräten. Die Norm stellt sicher, dass Geräte nicht nur den aktuellen Sicherheitsstandards entsprechen, sondern auch zukunftssicher sind, was sie für Hersteller und Anwender gleichermaßen relevant macht.
The EN IEC 60947-5-1:2025 standard is a critical document for those involved in the realm of low-voltage switchgear and controlgear, particularly focusing on control circuit devices and electromechanical switching elements. Its comprehensive scope is centered around devices that manage functionalities such as controlling, signaling, and interlocking within switchgear systems. One of the standard's notable strengths is its technical revision that significantly enhances the previous edition published in 2016. The update provides clarity and specificity regarding the scope structure, addressing exclusions and expanding requirements for control circuits. Furthermore, the revisions to normal service conditions, particularly in terms of shock and vibration, showcase a commitment to ensuring safety and reliability in operational environments. The standard also emphasizes comprehensive information and marking requirements, which now include environmental considerations, thereby aligning with IEC TS 63058:2021. This is essential as sustainability becomes an increasingly important factor in product design and manufacturing processes. The updates on constructional requirements and corresponding tests are equally commendable, especially concerning safety aspects, including precautions for artificial optical radiation and limited energy sources. Moreover, EN IEC 60947-5-1:2025 introduces critical electromagnetic compatibility (EMC) requirements, ensuring that devices adhere to generic document standards, thus safeguarding against interference. The inclusion of specific requirements for reed contact magnetic switches and class II circuit devices emphasizes the attention to detail that bolsters the document's relevance and utility in practical applications. The standard’s structure is further enhanced by the addition of new annexes, which provide detailed requirements for aspects such as audible signaling devices and pull-out tests. These inclusions ensure that manufacturers and users of control circuit devices are well equipped with the necessary guidelines to ensure compliance and uphold high performance and safety standards. Overall, the EN IEC 60947-5-1:2025 standard stands as a vital framework that addresses contemporary needs in the field of low-voltage switchgear and controlgear, ensuring that control circuit devices are not only safe but also efficient and environmentally responsible. This document is indispensable for industry stakeholders aiming to maintain compliance with modern technological and regulatory demands.
Le document de normalisation SIST EN IEC 60947-5-1:2025 se positionne comme une référence incontournable pour les dispositifs de circuits de commande et les éléments de commutation dans le domaine des équipements de basse tension. En tant que norme de la cinquième édition, elle remplace la quatrième édition publiée en 2016, apportant ainsi des révisions techniques significatives qui renforcent sa pertinence dans le secteur. L'EN IEC 60947-5-1:2025 couvre des dispositifs de circuits de commande destinés à des usages variés, tels que le contrôle, la signalisation et le verrouillage des appareillages et commandes. La portée de la norme est clairement définie, s'appliquant aux dispositifs ayant une tension nominale ne dépassant pas 1 000 V AC ou 600 V DC, ce qui en fait un guide indispensable pour les fabricants et les utilisateurs d'équipements de basse tension. Parmi les points forts de cette norme, on note l'actualisation de la structure de la portée et des exclusions, répondant ainsi aux besoins évolutifs du marché. Les exigences mises à jour en matière de circuits de contrôle assurent une meilleure conformité aux conditions de service normales, telles que les chocs et les vibrations, augmentant ainsi la fiabilité des installations. De plus, la norme met l'accent sur les exigences en matière de sécurité, incluant des aspects tels que la radiation optique artificielle, la sécurité des sources d'énergie limitées et les circuits à charge stockée, ce qui contribue à offrir une protection accrue contre les risques électriques. L'intégration des nouvelles exigences pour les interrupteurs à contact reed dans l'Annexe D reflète également une attention particulière portée aux technologies émergentes dans le domaine. L'EN IEC 60947-5-1:2025 établit également des lignes directrices concernant les dispositifs de signalisation sonore, les essais de déconnexion et les exigences relatives aux dispositifs de classe II, atteints par une isolation double ou renforcée dans l'Annexe F. Ces ajouts renforcent encore la polyvalence et l'applicabilité de la norme. Enfin, en incorporant des mises à jour sur les exigences en matière d'EMC et les informations environnementales selon l'IEC TS 63058:2021, cette norme reste en phase avec les préoccupations contemporaines sur la compatibilité électromagnétique et la durabilité, solidifiant ainsi son rôle central dans le cadre des équipements de basse tension. Ainsi, l'EN IEC 60947-5-1:2025 se distingue comme un document normatif de premier plan, alliant rigueur technique et actualisation pertinente pour répondre aux enjeux de sécurité et de performance des circuits de commande électromécaniques.
SIST EN IEC 60947-5-1:2025 표준은 저전압 스위치기어 및 제어기어의 제어 회로 장치 및 스위칭 요소에 관한 중요한 기준을 제공합니다. 이 표준의 범위는 제어 회로 장치와 스위칭 요소가 스위치기어 및 제어기어의 제어, 신호, 및 상호 잠금을 포함하는 활동에 사용된다는 점에서 매우 포괄적입니다. 최대 1,000V AC 또는 600V DC의 정격 전압을 가진 장치에 적용되며, 이는 전기 안전과 일관성을 보장합니다. 이번 제정의 강점 중 하나는 기존의 2016년도 판을 대체하며 시행한 기술 수정입니다. 이러한 수정은 제어 회로에 대한 요구 사항, 정상 서비스 조건, 안전성을 고려한 구조적 요구 사항 및 EMC 요구 사항의 업데이트를 포함하고 있습니다. 특히, 환경 정보 요구사항을 포함하는 마킹 요구사항의 업데이트는 지속 가능한 개발과 관련된 중요성을 강조합니다. 또한, 새로운 부록 D의 리드 접촉 자석 스위치에 대한 요구 사항 및 부록 F의 이중 또는 강화 절연을 통한 클래스 II 회로 장치 요구 사항은 기술적 진보를 보여줍니다. 부록 G의 당기 시험 업데이트는 장치의 신뢰성을 더욱 향상시키며, 부록 J의 가청 신호 장치에 대한 정보 요구 사항은 사용자 안전을 고려한 편의성을 증가시킵니다. EN IEC 60947-5-1:2025 표준은 저전압 스위치기어 및 제어기어 분야에서 높은 수준의 안전과 신뢰성을 유지하는 동시에, 최신 기술 요구사항을 충족할 수 있도록 설계되었습니다. 이는 관련 산업에 필수적인 지침이 될 것입니다.
SIST EN IEC 60947-5-1:2025は、低圧配電盤および制御機器に関する重要なスタンダードであり、制御回路デバイス及びスイッチング要素に焦点を当てています。この規格は、スイッチギアや制御機器の制御、信号、インターロッキングなどを目的とした機器に適用され、定格電圧が1,000 V AC（周波数1,000 Hz以下）または600 V DCを超えない制御回路デバイスに関して定められています。 本規格の強みは、技術的な改訂が加えられている点であり、その中にはスコープの構造や除外事項の更新、制御回路に関する要件の詳細化、通常の使用条件（衝撃や振動を含む）の更新が含まれています。さらに、環境情報に関する要件がIEC TS 63058:2021を参照して更新され、安全性に配慮した建設要件及び対応する試験方法も見直されています。 特に、EMC要件の更新も行われており、一般文書に基づいた適合性を確保しています。また、付録Dにおいてリード接点の磁気スイッチに関する新しい要件が記載され、付録FではクラスIIの回路デバイスが二重または強化絶縁によって達成される要件が設けられています。さらに、付録Gで引き抜き試験が更新され、付録Jでは可聴信号装置に関する情報要件が追加されたことで、より実用性の高い基準となっています。 新たに追加された付録Oも、さらなる技術向上を目指すうえでの重要な要素となっており、全体として本規格は機器の信頼性と安全性を高めるために必要な改訂が施されています。このスタンダードは、低圧配電盤および制御機器の分野において、現在の技術ニーズを満たすための重要な枠組みを提供しています。
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