SIST EN IEC 60947-5-5:2026

• Abstract:

  This part of IEC 60947-5 provides detailed specifications relating to the electrical and mechanical construction of emergency stop devices with mechanical latching function and to their testing.; This document is applicable to electrical control circuit devices and switching elements which are used to initiate an emergency stop signal. Such devices can be provided with their own enclosure and will be installed according to the product documentation.; This document does not apply to:; – emergency stop devices for non-electrical control applications, for example hydraulic or pneumatic;; – emergency stop devices without mechanical latching function.; An emergency stop device conforming to this document can also be used as part of an emergency switching off means in compliance with IEC 60364-5-53.; NOTE See also IEC 60204-1:2016 and IEC 60204-1:2016/AMD1:2021, 9.2.3.4.; This document does not address specific requirements on acoustic noise as the noise emission of electrical emergency stop devices with mechanical latching function is not considered to be a relevant hazard.

• Status: Published
• Public Enquiry End Date: 12-May-2025
• Publication Date: 17-Aug-2026
• ICS: 29.120.99 - Other electrical accessories
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 23-Jul-2026
• Due Date: 27-Sep-2026
• Completion Date: 18-Aug-2026
• Directive: Harmonized Standard2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive:

  ---

  Harmonized Standard2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive:

  ---

  Not Harmonized2023/1230 - Regulation (EU) 2023/1230 of the European Parliament and of the Council of 14 June 2023 on machinery and repealing Directive 2006/42/EC of the European Parliament and of the Council and Council Directive 73/361/EEC (Text with EEA relevance)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/605 - COMMISSION IMPLEMENTING DECISION of 20.1.2025 on a standardisation request to the European Committee for Standardization and to the European Committee for Electrotechnical Standardization as regards machinery and related products in support of Regulation (EU) 2023/1230 of the European Parliament and of the Council
• Ref Project: EN IEC 60947-5-5:2026 - Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function

• Replaces: SIST EN 60947-5-5:1999/A11:2013 - Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function
• Effective Date: 01-Sep-2026
• Replaces: SIST EN 60947-5-5:1999/A1:2005 - Low-voltage switchgear and controlgear -- Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function
• Effective Date: 01-Sep-2026
• Replaces: SIST EN 60947-5-5:1999/A2:2017 - Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function EN (60947-5-5:1997/A2:2017)
• Effective Date: 01-Sep-2026
• Replaces: SIST EN 60947-5-5:1999 - Low-voltage switchgear and controlgear -- Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function
• Effective Date: 01-Jun-2026
• Refers: SIST EN 60068-2-6:2008 - Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal)
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 60068-2-1:2026 - Environmental testing - Part 2-1: Tests - Test A: Cold (IEC 60068-2-1:2025)
• Effective Date: 16-Jun-2026
• Refers: SIST EN 60417-2:2002 - Graphical symbols for use on equipment -- Part 2: Symbol originals
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 60068-2-11:2021 - Environmental testing - Part 2-11: Tests - Test Ka: Salt mist (IEC 60068-2-11:2021)
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 60068-2-30:2025 - Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle) (IEC 60068-2-30:2025)
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 60068-2-2:2026 - Environmental testing - Part 2-2: Tests - Test b: Dry heat (IEC 60068-2-2:2025)
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 60947-5-1:2025 - Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching elements - Electromechanical control circuit devices (IEC 60947-5-1:2024)
• Effective Date: 16-Jun-2026
• Refers: SIST EN 60068-2-75:2014 - Environmental testing - Part 2-75: Tests - Test Eh: Hammer tests
• Effective Date: 16-Jun-2026
• Refers: SIST EN IEC 60947-1:2021 - Low-voltage switchgear and controlgear - Part 1: General rules (IEC 60947-1:2020)
• Effective Date: 16-Jun-2026
• Refers: SIST EN 60068-2-27:2009 - Environmental testing -- Part 2-27: Tests - Test Ea and guidance: Shock
• Effective Date: 16-Jun-2026
• Referred By: SIST EN 17067:2019 - Forestry machinery - Safety requirements on radio remote controls
• Effective Date: 21-Jul-2026

Overview

SIST EN IEC 60947-5-5:2026 defines the requirements for low-voltage switchgear and controlgear, specifically focusing on control circuit devices and switching elements that serve as electrical emergency stop devices with a mechanical latching function. This international standard, part of the IEC 60947 series, ensures emergency stop devices are reliable and consistent, particularly in industrial automation, machinery safety, and plant control systems.

This second edition introduces significant updates, including enhanced document structure, improved test methods for latch mechanisms, and specialized provisions for illuminated push-button emergency stop devices. Its scope covers only electrical control devices with mechanical latching, not hydraulic/pneumatic devices or those without latching.

Key Topics

• Document Alignment: Clause numbers and terminology are now consistent with other standards in the IEC 60947 series, supporting easier integration and reference.
• Mechanical Latching Requirements: Specifications for mandatory mechanical latching of emergency stop devices, ensuring that once actuated, the device remains in an emergency stop state until manually reset.
• Testing and Performance: Improved testing methodologies to verify that latch mechanisms and actuation fulfill safety and performance requirements, contributing to enhanced functional safety.
• Illuminated Devices: Introduction of Annex B with unique requirements for illuminated emergency stop push-buttons, including visual differentiation between active and inactive states via color changes.
• Device Types: Covers both push-button and trip wire (rope pull) style emergency stop devices, detailing their specific construction, marking, and operational requirements.
• Reliability and Functional Safety: Guidance on gathering and evaluating reliability data, referencing methods such as durability tests to ensure effective functional safety in diverse applications.
• Marking and Color Codes: Standardizes the use of red for actuators, yellow for backgrounds or marker flags, and blue for resetting actuators for improved on-site safety and recognition.

Applications

IEC 60947-5-5:2026 is applicable wherever electrical emergency stop devices must be integrated into control circuits to minimize risk, stop machinery, or provide rapid intervention in hazardous situations. Practical uses include:

• Industrial Machinery: Installing compliant emergency stop devices on machines to enable operators to halt equipment immediately in emergencies.
• Manufacturing Lines: Securing consecutive production stages with trip wire switches and illuminated push-buttons that meet international safety standards.
• Process Automation: Ensuring compliance with functional safety regulations in automated plants by using reliable, standardized emergency stop solutions.
• Plant Upgrades and Retrofits: Facilitating modernization efforts by allowing straightforward integration with other IEC 60947 switchgear and controlgear.

These devices, when conforming to IEC 60947-5-5:2026, can also function as part of emergency switching-off systems in accordance with IEC 60364-5-53, further extending their utility in electrical safety systems.

Related Standards

For robust implementation and greater interoperability, reference the following standards alongside SIST EN IEC 60947-5-5:2026:

• IEC 60947-1: Low-voltage switchgear and controlgear - General rules
• IEC 60947-5-1: Electromechanical control circuit devices
• IEC 60364-5-53: Selection and erection of electrical equipment - Isolation, switching, control and monitoring
• IEC 60204-1: Safety of machinery - Electrical equipment of machines
• ISO 13850: Emergency stop function - Principles for design

These complementary standards help achieve optimal safety, consistency, and reliability when designing, installing, and maintaining emergency stop devices in industrial environments.

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Keywords: IEC 60947-5-5:2026, low-voltage switchgear, controlgear, emergency stop device, mechanical latching, illuminated push-button, functional safety, machinery safety, standards compliance, industrial automation, SIST standards.

SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN 60947-5-5:1999
SIST EN 60947-5-5:1999/A1:2005
SIST EN 60947-5-5:1999/A11:2013
SIST EN 60947-5-5:1999/A2:2017
Nizkonapetostne stikalne in krmilne naprave - 5-5. del: Krmilne naprave in stikalni
elementi - Električna (varnostna) naprava za zaustavitev v sili z mehansko zaporo
(IEC 60947-5-5:2026)
Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching
elements - Electrical emergency stop device with mechanical latching function (IEC
60947-5-5:2026)
Niederspannungsschaltgeräte - Teil 5-5: Steuergeräte und Schaltelemente - Elektrisches
NOT-AUS-Gerät mit mechanischer Verrastfunktion (IEC 60947-5-5:2026)
Appareillage à basse tension - Partie 5-5: Appareils et éléments de commutation pour
circuits de commande - Appareil d'arrêt d'urgence électrique à accrochage mécanique
(IEC 60947-5-5:2026)
Ta slovenski standard je istoveten z: EN IEC 60947-5-5:2026
ICS:
29.120.99 Druga električna dodatna Other electrical accessories
oprema
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 60947-5-5

NORME EUROPÉENNE
EUROPÄISCHE NORM July 2026
ICS 29.130.20; 29.120.99 Supersedes EN 60947-5-5:1997; EN 60947-5-
5:1997/A1:2005; EN 60947-5-5:1997/A11:2013; EN
60947-5-5:1997/A2:2017
English Version
Low-voltage switchgear and controlgear - Part 5-5: Control
circuit devices and switching elements - Electrical emergency
stop device with mechanical latching function
(IEC 60947-5-5:2026)
Appareillage à basse tension - Partie 5-5: Appareils et Niederspannungsschaltgeräte - Teil 5-5: Steuergeräte und
éléments de commutation pour circuits de commande - Schaltelemente - Elektrisches NOT-AUS-Gerät mit
Appareils d'arrêt d'urgence électriques à accrochage mechanischer Verrastfunktion
mécanique (IEC 60947-5-5:2026)
(IEC 60947-5-5:2026)
This European Standard was approved by CENELEC on 2024-10-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-5-5:2026 E

European foreword
The text of document 121A/699/FDIS, future edition 2 of IEC 60947-5-5, 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) 2027-07-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-07-31
document have to be withdrawn
This document supersedes EN 60947-5-5:1997 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 is read in conjunction with EN IEC 60947-1:2021 and EN IEC 60947-5-1:2025.
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 60947-5-5:2026 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 60073:2002 NOTE Approved as EN 60073:2002 (not modified)
IEC 60204-1:2016 NOTE Approved as EN 60204-1:2018
IEC 60204-1:2016/AMD1:2021 NOTE Approved as EN 60204-1:2018/A1:2025 (not modified)
IEC 62061:2021 NOTE Approved as EN IEC 62061:2021 (not modified)
IEC 62061:2021/AMD1:2024 NOTE Approved as EN IEC 62061:2021/A1:2024 (not modified)
IEC 62683-1 NOTE Approved as EN IEC 62683-1
ISO 12100:2010 NOTE Approved as EN ISO 12100:2010 (not modified)
ISO 13849-1:2023 NOTE Approved as EN ISO 13849-1:2023 (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 60068-2-1 2007 Environmental testing – Part 2-1: Tests EN IEC 60068-2-1 2025
– Test A: Cold
IEC 60068-2-2 2007 Environmental testing – Part 2-2: EN IEC 60068-2-2 2025
Tests – 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 60068-2-11 2021 Environmental testing – Part 2-11: EN IEC 60068-2-11 2021
Tests – Test Ka: Salt mist
IEC 60068-2-27 2008 Environmental testing – Part 2-27: EN 60068-2-27 2009
Tests – Test Ea and guidance: Shock
IEC 60068-2-30 2005 Environmental testing – Part 2-30: EN IEC 60068-2-30 2025
Tests – Test Db: Damp heat, cyclic (12
h + 12 h cycle)
IEC 60068-2-75 2014 Environmental testing – Part 2-75: EN 60068-2-75 2014
Tests – Test Eh: Hammer tests
+ A1 2025
IEC 60947-1 2020 Low-voltage switchgear and controlgear EN IEC 60947-1 2021
– Part 1: General rules
+ AC 2023-
+ AC 2024-
IEC 60947-5-1 2024 Low-voltage switchgear and controlgear EN IEC 60947-5-1 2025
– Part 5-1: Control circuit devices and
switching elements – Electromechanical
control circuit devices
Annex ZZA
(informative)
Relationship between this European Standard and the essential
requirements of Regulation (EU) 2023/1230 aimed to be covered
This European Standard has been prepared under a Commission’s standardization request
C(2025)129 final Commission Implementing Decision of 20 January 2025 to the European Committee
for Standardization and to the European Committee for Electrotechnical Standardization as regards
machinery in support of Regulation (EU) 2023/1230 of the European Parliament and of the Council
(M/605) to provide one voluntary means of conforming to essential requirements of Regulation (EU)
2023/1230 of the European Parliament and of the Council of 14 June 2023 on machinery (OJ L 165,
29.6.2023).
Once this standard is cited in the Official Journal of the European Union under that Regulation,
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 essential requirements
of that Regulation, and associated EFTA regulations.
Table ZZA.1 — Correspondence between this European Standard and Annex III of Regulation
(EU) 2023/1230
The relevant Essential Clause(s)/sub-clause(s) of Remarks/Notes
Requirements of Regulation this EN
(EU) 2023/1230
1.2.1 6.1, 6.3, 6.5, 7, 8.2, 8.3, B.2
1.2.2 (a, c, f, g) 6.2, Clause 7, 8.1, 8.2, 8.4,
Annex B
1.2.2 (b, d, e) - not covered
1.2.4.3 6.2, 8.1, 8.2, 8.4, Annex A,
Annex B
1.5.1 6.1, 6.2, 6.3, 6.5, Clause 7, 8.1,
8.2, 8.4, Annex A, Annex B
1.7.4.2 (e, g, i, r) 6.1, 6.3, Annex B
1.7.4.2 (a, b, c, d, f, h, j, k, l, m, - not covered
n, o, p, q, s, t, u, v, w, x)
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 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 ZZB.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 ZZB.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 / Notes
Directive 2014/35/EU
(1)(a) 6.1, 6.2, 6.3, 8.1, 8.4, Annex A, Annex B

(1)(b) 6.1, 6.3, 6.5, Clause 7, 8.1, 8.2, 8.4

(1)(c) 6.1, 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, 6.3, 6.5, 8.1, 8.2, 8.4

(2)(b) 8.1, 8.2, 8.4
(2)(c) 6.1, 6.3, 6.5, 8.1, 8.2, 8.4, Annex A,
Annex B
(2)(d) 6.1, 6.3, 6.5, 7, 8.1, 8.2, 8.4
(3)(a) 6.1, 6.3, 6.5, 7, 8.1, 8.2, 8.4
(3)(b) 6.1, 6.3, 6.5, 7, 8.1, 8.2, 8.4, Annex A,
Annex B
(3)(c) 6.1, 6.3, 6.5, 8.1, 8.2, 8.4, Annex A,
Annex B
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 60947-5-5 ®
Edition 2.0 2026-02
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear -
Part 5-5: Control circuit devices and switching elements - Electrical emergency
stop device with mechanical latching function
ICS 29.130.20; 29.120.99 ISBN 978-2-8327-0874-3

IEC 60947-5-5:2026-02(en)
IEC 60947-5-5:2026 © IEC 2026
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 9
4.1 Contact elements . 9
4.2 Means of actuation . 9
4.3 Additional functions . 9
4.4 Emergency stop device mounting . 9
5 Characteristics . 9
5.1 Summary of characteristics . 9
5.2 Type of emergency stop device . 9
5.3 Rated and limiting values for switching elements . 9
5.4 Utilization categories for switching elements . 9
6 Product information . 10
6.1 Nature of information . 10
6.2 Marking . 10
6.2.1 General. 10
6.2.2 Push-button type emergency stop devices . 10
6.2.3 Trip wire switches . 10
6.3 Instructions for installation, operation and maintenance, decommissioning
and dismantling . 11
6.4 Environmental information . 11
6.5 Reliability data . 11
7 Normal service, mounting and transport conditions. 11
8 Constructional and performance requirements . 11
8.1 Constructional requirements . 11
8.1.1 General. 11
8.1.2 Additional requirements for push-button type emergency stop devices. 11
8.1.3 Additional requirements for trip wire switches . 12
8.2 Performance requirements . 12
8.2.1 General. 12
8.2.2 Direct opening action. 12
8.2.3 Operation . 12
8.2.4 Opening and latching . 12
8.2.5 Additional requirements for push-button type emergency stop device . 13
8.2.6 Additional requirements for trip wire switches . 13
8.3 Electromagnetic compatibility (EMC). 13
8.4 Special requirements . 13
8.4.1 Requirements for functional safety applications . 13
8.4.2 Requirements for emergency stop devices embedding additional
functions . 13
9 Tests . 14
9.1 Kinds of tests . 14
9.1.1 General. 14
9.1.2 Type tests . 14
IEC 60947-5-5:2026 © IEC 2026
9.1.3 Routine tests . 14
9.1.4 Sampling tests . 14
9.1.5 Special tests. 14
9.2 Compliance with constructional requirements . 15
9.3 Performance . 15
9.3.1 General. 15
9.3.2 Test sequences . 15
9.3.3 General test condition . 15
9.3.4 Robustness of a push-button actuator . 16
9.3.5 Robustness of a trip wire actuator . 16
9.3.6 Mechanical durability test . 17
9.3.7 Conditioning procedures . 17
9.3.8 Shock test . 17
9.3.9 Vibration tests . 18
9.3.10 Opening, latching, actuation, resetting and impact tests . 18
9.4 Tests for EMC . 20
Annex A (normative) Procedure to determine reliability data for electrical emergency
stop devices used in functional safety applications. 21
A.1 General . 21
A.1.1 Object . 21
A.1.2 General requirements . 21
A.2 Terms, definitions and symbols . 21
A.3 Method based on durability test results . 21
A.3.1 General method . 21
A.3.2 Test requirements . 21
A.3.3 Number of samples . 22
A.3.4 Characterization of a failure mode . 22
A.3.5 Weibull modelling . 22
A.3.6 Useful life and upper limit of failure rate . 22
A.3.7 Reliability data . 22
A.4 Data information . 22
A.5 Examples . 22
Annex B (normative) Additional requirements for illuminated push-button type
emergency stop devices . 23
B.1 General . 23
B.2 Special requirements for an emergency stop device using illumination
function to signal whether the device is active or not . 23
Bibliography . 24

Figure 1 – Symbol (IEC 60417-5638:2002-10) for emergency stop. 10
Figure 2 – Hammer for tests . 19

Table 1 – Robustness of a push-button actuator . 16
Table 2 – Relationship between the mounting hole and the hammer height. 20

IEC 60947-5-5:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Low-voltage switchgear and controlgear -
Part 5-5: Control circuit devices and switching elements -
Electrical emergency stop device with mechanical latching function

FOREWORD
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60947-5-5 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. It is an International Standard.
This second edition cancels and replaces the first edition published in 1997. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) re-shaping the document with the clause numbers and names to be in line with other
documents of the 60947 series;
b) review of the test method to reasonably determine that the latch mechanism meets the
requirements of the document;
IEC 60947-5-5:2026 © IEC 2026
c) new Annex B for special requirements for illuminated push-button type emergency stop
devices, including the reference to a function to distinguish between "active and inactive"
by changing the colour of the push-button depending on the illumination.
The text of this International Standard is based on the following documents:
Draft Report on voting
121A/699/FDIS 121A/703/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This International Standard is to be used in conjunction with IEC 60947-1:2020 and with
IEC 60947-5-1:2024.
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.
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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 60947-5-5:2026 © IEC 2026
INTRODUCTION
This document deals specifically with electrical emergency stop devices with mechanical
latching function and gives additional electrical and mechanical requirements to those given in
the following International Standards:
– ISO 13850, giving requirements for the emergency stop function of a machine, whatever be
the energy used;
– IEC 60204-1, giving additional requirements for an emergency stop function realized by the
electrical equipment of a machine;
– IEC 60947-5-1, specifying electrical characteristics of electromechanical control circuit
devices.
IEC 60947-5-5:2026 © IEC 2026
1 Scope
This part of IEC 60947-5 provides detailed specifications relating to the electrical and
mechanical construction of emergency stop devices with mechanical latching function and to
their testing.
This document is applicable to electrical control circuit devices and switching elements which
are used to initiate an emergency stop signal. Such devices can be provided with their own
enclosure and will be installed according to the product documentation.
This document does not apply to:
– emergency stop devices for non-electrical control applications, for example hydraulic or
pneumatic;
– emergency stop devices without mechanical latching function.
An emergency stop device conforming to this document can also be used as part of an
emergency switching off means in compliance with IEC 60364-5-53.
NOTE See also IEC 60204-1:2016 and IEC 60204-1:2016/AMD1:2021, 9.2.3.4.
This document does not address specific requirements on acoustic noise as the noise emission
of electrical emergency stop devices with mechanical latching function is not considered to be
a relevant hazard.
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, Environmental testing - Part 2-1: Tests - Test A: Cold
IEC 60068-2-2, Environmental testing - Part 2-2: Tests - Test B: Dry heat
IEC 60068-2-6, Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal)
IEC 60068-2-11, Environmental testing - Part 2-11: Tests - Test Ka: Salt mist
IEC 60068-2-27, Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock
IEC 60068-2-30, Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
IEC 60068-2-75, Environmental testing - Part 2-75: Tests - Test Eh: Hammer tests
IEC 60417, Graphical symbols for use on equipment, available at https://www.graphical-
symbols.info/equipment
IEC 60947-1:2020, Low-voltage switchgear and controlgear - Part 1: General rules
IEC 60947-5-1:2024, Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices
and switching elements - Electromechanical control circuit devices
IEC 60947-5-5:2026 © IEC 2026
ISO 13850:2015, Safety of machinery - Emergency stop function - Principles for design
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60947-1,
IEC 60947-5-1 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
emergency stop function
function which is intended to:
– avert or to reduce hazards to persons, damage to machinery or to work in progress;
– be initiated by a single human action.
[SOURCE: ISO 12100:2010, 3.40, modified – the first preferred term "emergency stop" has
been removed.]
3.2
emergency stop device
manually operated control circuit device used to initiate an emergency stop function
Note 1 to entry: An emergency stop device can also provide auxiliary functions, for example for redundancy or for
signalling through additional contact element(s), or both. Such additional contact(s) can be normally open or normally
closed, or both.
3.3
emergency stop signal
signal, which is generated by an emergency stop device contact, used to initiate an emergency
stop function
3.4
actuating system
mechanical parts which transmit the actuating force to the
contact elements
[SOURCE: IEC 60050-441:1984, 441-15-21, modified – restricted to electromechanical
emergency stop devices; the note is not relevant anymore.]
3.5
actuator
part of the actuating system which is operated by a part of the
human body
Note 1 to entry: Examples of an actuator include: a push-button, a wire, or a rope.
[SOURCE: IEC 60050-441:1984, 441-15-22, modified – actuation is intended to be achieved by
human only, the domain has been added and the note has been revised.]
IEC 60947-5-5:2026 © IEC 2026
3.6
rest position
position of an emergency stop device, or of a part of it, which has not been actuated
Note 1 to entry: In rest position, the normally closed contacts are closed and the machine (or equipment) can work.
3.7
actuated position
position of an emergency stop device, or of a part of it, after it has been operated
Note 1 to entry: In the actuated position of the emergency stop device, the normally closed contacts remain open.
3.8
latching
function or means which engage and maintain the actuating
system in the actuated position until reset by a separate manual action
3.9
resetting
disengaging
manual action to return the actuating system of the emergency
stop device from the actuated position to the rest position
Note 1 to entry: Examples of resetting include the rotation of a key or the actuator, pulling the actuator or pushing
or rotating a dedicated reset button.
3.10
direct opening action
DEPRECATED: positive opening action
achievement of contact separation as a direct result of a specified
movement of the switch actuator through non-resilient members (e.g. non dependent upon
springs)
[SOURCE: IEC 60947-5-1:2024, 3.1.15.2, modified – addition of a deprecated term.]
3.11
push-button type emergency stop device
emergency stop device with a button type as actuator
3.12
trigger mechanism
positive latching
safety lock mechanism
mechanical means ensuring that when operated, latching occurs at the point where the
emergency stop signal is generated
3.13
trip wire switch
rope pull switch
emergency stop device in which the actuator is a rope, a wire or similar means
IEC 60947-5-5:2026 © IEC 2026
4 Classification
4.1 Contact elements
Subclause 4.1 of IEC 60947-5-1:2024 applies.
4.2 Means of actuation
Emergency stop devices can be classified according to the means of actuation, for example
push-button, trip wire switch.
4.3 Additional functions
Emergency stop devices can be classified according to the additional function(s) of the device
(e.g. illumination, trigger mechanism, resetting means or locking mechanism to maintain the
emergency stop signal).
4.4 Emergency stop device mounting
Emergency stop devices can be classified according to the mounting of the device, for example
hole size D16, D22, D30 for a push-button type.
5 Characteristics
5.1 Summary of characteristics
Subclause 5.1 of IEC 60947-5-1:2024 applies.
NOTE For information exchange in electronic format, see ACC515 and ACC522 classes of IEC 62683-1 Common
Data Dictionary for trip wire switch, and emergency stop push-button respectively.
5.2 Type of emergency stop device
The kind of emergency stop device shall be stated:
– push-button;
– trip wire switch.
5.3 Rated and limiting values for switching elements
Subclause 5.3 of IEC 60947-5-1:2024 applies.
5.4 Utilization categories for switching elements
For emergency stop contact elements with direct opening action, the utilization categories shall
be one or more categories specified in IEC 60947-5-1:2024, K.5.4.
For additional contact elements for auxiliary functions, the utilization categories shall be one or
more categories selected from IEC 60947-5-1:2024, Table 1.
IEC 60947-5-5:2026 © IEC 2026
6 Product information
6.1 Nature of information
Subclause 6.1 and Clause K.6 of IEC 60947-5-1:2024 apply with the following addition.
For push-button switches, information provided in the product documentation shall include:
– resetting/unlatching method;
– trigger mechanism, if applicable;
– illumination function, if applicable.
For trip wire switches, information provided in the product documentation shall include:
– resetting/unlatching method;
– the maximum length of wire or rope;
– information to establish correct tension of wire or rope;
– the distances between supports;
– recommendation to use only straight runs of wire or rope;
– if applicable, guidance on maintenance for pulleys and eyelets, and the measures necessary
to ensure that the wire or rope remains in proper position.
6.2 Marking
6.2.1 General
Subclause 6.2 of IEC 60947-5-1:2024, with the exception of 6.2.4, applies with the following
additions.
6.2.2 Push-button type emergency stop devices
Where a symbol is necessary for clarification, the symbol IEC 60417-5638:2002-10 shall be
used (see Figure 1).
Figure 1 – Symbol (IEC 60417-5638:2002-10) for emergency stop
The direction of unlatching shall be identified when resetting is achieved by rotation of the
button. The identification of the direction of unlatching shall have the same or nearly the same
colour as the actuator in order to avoid misinterpretation.
NOTE 1 Compliance with this requirement fulfils ISO 13850:2015, 4.3.7.
NOTE 2 See also IEC 60073 and ISO 3864 series for general information concerning identification and safety
colours.
6.2.3 Trip wire switches
Marker flags may be attached to trip wires or ropes for improved visibility. See 8.1.3. Where a
symbol is necessary for clarification on the marker flag, the symbol IEC 60417-5638:2002-10
shall be used (see Figure 1).
IEC 60947-5-5:2026 © IEC 2026
6.3 Instructions for installation, operation and maintenance, decommissioning and
dismantling
Subclause 6.3 of IEC 60947-5-1:2024 applies.
6.4 Environmental information
Subclause 6.4 of IEC 60947-5-1:2024 applies.
6.5 Reliability data
According to IEC 62061:2021 and IEC 62061:2021/AMD1:2024, Annex C and
ISO 13849-1:2023, Annex O, the main functional safety parameter characterizing an emergency
stop device is B .
10D
B for an emergency stop device is the number of cycles by which 10 % of the device
10D
population will have failed dangerously, which means the normally closed contact failed to open.
for an emergency stop device shall be established in accordance with Annex A.
B
10D
For information exchange in electronic format, the ACC007 class and ACE056 property (defined
in the IEC 62683 domain of IEC CDD) should be used.
7 Normal service, mounting and transport conditions
Clause 7 of IEC 60947-5-1:2024 applies with the following addition.
Additional tests for shock and vibration are defined in 9.3.8 and 9.3.9.
8 Constructional and performance requirements
8.1 Constructional requirements
8.1.1 General
Subclause 8.1 of IEC 60947-5-1:2024 applies with the following additions.
Means shall be provided to enable the emergency stop device to be securely installed in its
intended mounting position.
Verification of the applicable constructional requirements in 8.1.2 or 8.1.3 shall be conducted
in accordance with 9.2.
8.1.2 Additional requirements for push-button type emergency stop devices
Push-buttons used as emergency stop device actuators shall be coloured red. When a
background exists behind the actuator, it shall be coloured yellow.
Additional requirements for illuminated push-button type emergency stop devices are defined
in Annex B.
IEC 60947-5-5:2026 © IEC 2026
8.1.3 Additional requirements for trip wire switches
Ropes or wires used for trip wire switches shall be coloured red. If marker flags are used to
improve the visibility of wires or ropes, they shall be coloured yellow or "red and yellow"
(alternating stripes or colours).
The integral resetting actuator shall be coloured blue.
When coloured indicators are provided to assist setting of a trip wire switch, green shall indicate
the correct setting of the rest position and yellow shall indicate the correct setting of the
actuated position.
8.2 Performance requirements
8.2.1 General
Subclause 8.2 of IEC 60947-5-1:2024 applies with the following additions.
8.2.2 Direct opening action
Emergency stop devices including all normally closed contact elements generating the
emergency stop signal shall have a direct opening action in accordance with
IEC 60947-5-1:2024, Annex K.
8.2.3 Operation
It shall be possible to operate and reset the emergency stop device under all normal service
conditions.
For the normally closed contacts generating the emergency stop signal, vibrations or shocks,
or both, shall not cause the opening of the contacts in the closed position or the closing of the
contacts in the open position, nor actuation or release of the latching mechanism.
The tests shall be conducted in accordance with 9.3.
8.2.4 Opening and latching
When the emergency stop signal has been generated during actuation of the emergency stop
device, the emergency stop signal shall be maintained by latching of the actuating system. The
emergency stop signal shall be maintained until the emergency stop device is reset
(disengaged). It shall not be possible for the emergency stop device to latch without generating
the emergency stop signal.
The latching shall operate correctly when the emergency stop device is tested following the
conditioning procedures specified in 9.3.7.
The opening test shall be conducted in accordance with 9.3.10.2.1. Additionally, the latching
test can be conducted in accordance with 9.3.10.2.2 in case the trigger mechanism is stated in
the product documentation.
IEC 60947-5-5:2026 © IEC 2026
8.2.5 Additional requirements for push-button type emergency stop device
A push-bu
...