kSIST FprEN IEC 60947-5-5:2025

SLOVENSKI STANDARD
oSIST prEN IEC 60947-5-5:2025
01-maj-2025
Nizkonapetostne stikalne in krmilne naprave - 5-5. del: Krmilne naprave in stikalni
elementi - Električna (varnostna) naprava za zaustavitev v sili z mehansko zaporo
Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching
elements - Electrical emergency stop device with mechanical latching function
Niederspannungsschaltgeräte - Teil 5-5: Steuergeräte und Schaltelemente - Elektrisches
NOT-AUS-Gerät mit mechanischer Verrastfunktion
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
Ta slovenski standard je istoveten z: prEN IEC 60947-5-5:2025
ICS:
29.120.99 Druga električna dodatna Other electrical accessories
oprema
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
oSIST prEN IEC 60947-5-5:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 60947-5-5:2025
oSIST prEN IEC 60947-5-5:2025
121A/644A*/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60947-5-5 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-03-07 (2025-02-28) 2025-05-02 (2025-04-25)
SUPERSEDES DOCUMENTS:
121A/612/CDV, 121A/636A/RVC, 121A/644/CDV
IEC SC 121A : LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
SECRETARIAT: SECRETARY:
France Mr Michaël LAHEURTE
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 44
ASPECTS CONCERNED:
Electromagnetic Compatibility, Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of CENELEC,
is drawn to the fact that this Committee Draft for Vote (CDV) is
submitted for parallel voting.
The CENELEC members are invited to vote through the CENELEC
online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which t hey are aware
and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses to be
included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC c lauses. (SEE
AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Low-voltage switchgear and controlgear – Part 5-5: Control circuit devices and switching elements – Electrical
emergency stop device with mechanical latching function
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
*Note to this replacement document:
Any reference to the terms “footswitch” and “footswitches”, including full paragraphs referring to, have been
removed. This is the only change from the previous 121A/644/CDV.
nd
SC121A officers are supporting IEC 60947-5-5 ED2 2 CDV.
Experts are kindly requested to refer to line numbers when commenting.
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

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CONTENTS
FOREWORD . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification . 10
4.1 Contact elements . 10
4.2 Means of actuation. 10
4.3 Additional functions . 10
4.4 Emergency stop device mounting . 10
5 Characteristics . 10
5.1 Summary of characteristics . 10
5.2 Type of emergency stop device . 10
5.3 Rated and limiting values for switching elements . 10
5.4 Utilization categories. 10
6 Product information . 10
6.1 Nature of information . 10
6.2 Marking . 11
6.2.1 General . 11
6.2.2 Push-button type emergency stop devices . 11
6.2.3 Trip wire switches . 11
6.3 Instructions for installation, operation and maintenance, decommissioning
and dismantling. 11
6.4 Environmental information . 11
6.5 Reliability data . 12
7 Normal service, mounting and transport conditions . 12
8 Constructional and performance requirements . 12
8.1 Constructional requirements . 12
8.1.1 General . 12
8.1.2 Additional requirements for push-button type emergency stop devices. 12
8.1.3 Additional requirements for trip wire switches . 12
8.2 Performance requirements . 13
8.2.1 General . 13
8.2.2 Contact elements for direct opening action . 13
8.2.3 Operation . 13
8.2.4 Opening and latching . 13
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) . 14
8.4 Special requirements . 14
8.4.1 Requirements for functional safety applications . 14
8.4.2 Requirements for emergency stop devices embedding additional
functions . 14
9 Tests . 14

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9.1 Kinds of tests . 14
9.1.1 General . 14
9.1.2 Type tests . 14
9.1.3 Routine tests . 15
9.1.4 Sampling tests . 15
9.1.5 Special tests . 15
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 . 16
9.3.4 Robustness of a push-button actuator . 16
9.3.5 Robustness of a trip wire actuator . 17
9.3.6 Mechanical Durability test . 17
9.3.7 Conditioning procedures . 17
9.3.8 Shock test . 18
9.3.9 Vibration tests . 18
9.3.10 Opening, latching, actuation, resetting and impact tests . 19
9.4 Tests for EMC . 21
Annex A (normative) Procedure to determine reliability data for electrical emergency
stop devices used in functional safety applications . 22
A.1 General . 22
A.1.1 Object . 22
A.1.2 General requirements . 22
A.2 Terms, definitions and symbols . 22
A.3 Method based on durability test results . 22
A.3.1 General method . 22
A.3.2 Test requirements . 22
A.3.3 Number of samples . 23
A.3.4 Characterization of a failure mode . 23
A.3.5 Weibull Modelling . 23
A.3.6 Useful life and upper limit of failure rate . 23
A.3.7 Reliability data . 23
A.4 Data information . 23
A.5 Examples . 23
Annex B (normative) Special requirements for illuminated push-button type
emergency stop devices . 24
B.1 General . 24
B.2 Special requirements for an emergency stop device using illumination
function to signal whether the device is active or not . 24
Bibliography . 25

Figure 1 – Symbol (5638) for emergency stop . 11
Figure 2 – Hammer for tests . 20

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

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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
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
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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
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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 document with the clause numbers and names to be in line with other documents
of the IEC 60947 series;
b) review of the test method to reasonably determine that the latch mechanism meets the
requirements of the standard;
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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 color 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/XX/FDIS 121A/XX/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.
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Introduction
The present 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.
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1 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
3 Part 5-5: Control circuit devices and switching elements –
4 Electrical emergency stop device with mechanical latching function
8 1 Scope
9 This part of IEC 60947-5 provides detailed specifications relating to the electrical and
10 mechanical construction of emergency stop devices with mechanical latching function and to
11 their testing.
12 This document is applicable to electrical control circuit devices and switching elements which
13 are used to initiate an emergency stop signal. Such devices can be provided with their own
14 enclosure and will be installed according to the product documentation.
15 This document does not apply to:
16 – emergency stop devices for non-electrical control applications, for example hydraulic or
17 pneumatic;
18 – emergency stop devices without mechanical latching function.
19 An emergency stop device conforming to this document can also be used as part of an
20 emergency switching off means in compliance with IEC 60364-5-53.
21 NOTE See also IEC 60204-1:2016 and IEC 60204-1:2016/AMD1:2021, 9.2.3.4.
22 This document does not deal with any specific requirements on acoustic noise as the noise
23 emission of electrical emergency stop devices with mechanical latching function is not
24 considered to be a relevant hazard.
25 2 Normative references
26 The following documents are referred to in the text in such a way that some or all of their content
27 constitutes requirements of this document. For dated references, only the edition cited applies.
28 For undated references, the latest edition of the referenced document (including any
29 amendments) applies.
30 IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
31 IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
32 IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
33 IEC 60068-2-11, Environmental testing – Part 2: Tests – Test Ka: Salt mist
34 IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
35 IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
36 (12 h + 12 h cycle)
37 IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests

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38 IEC 60417-DB , Graphical symbols for use on equipment, available at http://www.graphical-
39 symbols.info/equipment
40 IEC 60947-1:2020, Low-voltage switchgear and controlgear – Part 1: General rules
41 IEC 60947-5-1:2024, Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices
42 and switching elements – Electromechanical control circuit devices
43 ISO 13850:2015, Safety of machinery – Emergency stop function – Principles for design
44 3 Terms and definitions
45 For the purposes of this document, the terms and definitions given in IEC 60947-1 and in
46 IEC 60947-5-1 and the following apply.
47 ISO and IEC maintain terminology databases for use in standardization at the following
48 addresses:
49 • IEC Electropedia: available at https://www.electropedia.org/
50 • ISO Online browsing platform: available at https://www.iso.org/obp
51 3.1
52 emergency stop function
53 function which is intended to:
54 – avert or to reduce hazards to persons, damage to machinery or to work in progress; and
55 – be initiated by a single human action.
56 [SOURCE: ISO 12100:2010, 3.40, modified – the first preferred term "emergency stop" has
57 been removed.]
58 3.2
59 emergency stop device
60 manually operated control circuit device used to initiate an emergency stop function
61 Note 1 to entry: An emergency stop device can also provide auxiliary functions, for example for redundancy or for
62 signaling through additional contact element(s), or both. Such additional contact(s) can be normally open or normally
63 closed, or both.
64 3.3
65 emergency stop signal
66 signal, which is generated by an emergency stop device contact, used to initiate an emergency
67 stop function
68 3.4
69 actuating system
70 mechanical parts which transmit the actuating force to the
71 contact elements
72 [IEC 60050-441:1984, 441-15-21, modified – restricted to electromechanical emergency stop
73 devices; the note is not relevant anymore.]
___________
“DB” refers to the IEC on-line database, available at: http://www.graphical-symbols.info/equipment.

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74 3.5
75 actuator
76 part of the actuating system which is operated by a part of the
77 human body
78 Note 1 to entry: Examples of an actuator include: a push-button, a wire or a rope.
79 [IEC 60050-441:1984, 441-15-22, modified – actuation is intended to be achieved by human
80 only and the domain has been added and the note has been revised.]
81 3.6
82 rest position
83 position of an emergency stop device, or of a part of it, which has not been actuated
84 Note 1 to entry: In rest position, the normally closed contacts are closed and the machine (or equipment) can work.
85 3.7
86 actuated position
87 position of an emergency stop device, or of a part of it, after it has been operated
88 Note 1 to entry: In the actuated position of the emergency stop device, the normally closed contacts remain open.
89 3.8
90 latching
91 function or means which engage and maintain the actuating
92 system in the actuated position until reset by a separate manual action
93 3.9
94 resetting
95 disengaging
96 manual action to return the actuating system of the emergency
97 stop device from the actuated position to the rest position
98 Note 1 to entry: Examples of resetting include the rotation of a key or the actuator, pulling the actuator or pushing
99 or rotating a dedicated reset button.
100 3.10
101 direct opening action
102 DEPRECATED: positive opening action
103 achievement of contact separation as a direct result of a specified
104 movement of the switch actuator through non-resilient members (e.g. non-dependent upon
105 springs)
106 [IEC 60947-5-1:2024, 3.1.15.2, modified – addition of a deprecated term.]
107 3.11
108 push-button type emergency stop device
109 emergency stop device with a button type as actuator
110 3.12
111 trigger mechanism
112 positive latching
113 safety lock mechanism
114 mechanical means ensuring that, when operated, latching occurs at the point where the
115 emergency stop signal is generated
116 3.13
117 trip wire switch
118 rope pull switch
119 emergency stop device in which the actuator is a rope, a wire or similar means

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120 4 Classification
121 4.1 Contact elements
122 Subclause 4.1 of IEC 60947-5-1:2024 applies.
123 4.2 Means of actuation
124 Emergency stop devices can be classified according to the means of actuation, for example
125 push-button, trip wire switch.
126 4.3 Additional functions
127 Emergency stop devices can be classified according to the additional function(s) of the device
128 (e.g. illumination, trigger mechanism, resetting means or locking mechanism to maintain the
129 emergency stop signal).
130 4.4 Emergency stop device mounting
131 Emergency stop devices can be classified according to the mounting of the device, for example
132 hole size D16, D22, D30 for a push-button type.
133 5 Characteristics
134 5.1 Summary of characteristics
135 Subclause 5.1 of IEC 60947-5-1:2024 applies.
136 NOTE For information exchange in electronic format, see ACC515 and ACC522 classes of IEC 62683-1 Common
137 Data Dictionary for trip wire switch and emergency stop push-button respectively.
138 5.2 Type of emergency stop device
139 The kind of emergency stop device shall be stated:
140 – push-button;
141 – trip wire switch.
142 5.3 Rated and limiting values for switching elements
143 Subclause 5.3 of IEC 60947-5-1:2024 applies.
144 5.4 Utilization categories for switching elements
145 For emergency stop contact elements with direct opening action, the utilization categories shall
146 be one or more categories specified in IEC 60947-5-1:2024, K.5.4.
147 For additional contact elements for auxiliary functions, the utilization categories shall be one or
148 more categories selected from IEC 60947-5-1:2024, Table 1.
149 6 Product information
150 6.1 Nature of information
151 Subclause 6.1 of IEC 60947-5-1:2024 applies with the following addition.
152 For push-button switches, information provided in the product documentation shall include:

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153 – trigger mechanism, if applicable;
154 – illumination function, if applicable.
155 For trip wire switches, information provided in the product documentation shall include:
156 • the maximum length of wire or rope;
157 • the correct tension of wire or rope;
158 • the distances between supports;
159 • recommendation to use only straight runs of wire or rope;
160 • if applicable, guidance on maintenance for pulleys and eyelets, and the measures necessary
161 to ensure that the wire or rope remains in proper position.
162 6.2 Marking
163 6.2.1 General
164 Subclause 6.2 of IEC 60947-5-1:2024 applies with the following additions.
165 6.2.2 Push-button type emergency stop devices
166 Where a symbol is necessary for clarification, the symbol IEC 60417-5638: (2002-10) shall be
167 used (see Figure 1).
169 Figure 1 – Symbol (5638) for emergency stop
170 The direction of unlatching shall be identified when resetting is achieved by rotation of the
171 button. The identification of the direction of unlatching shall have the same or nearly the same
172 colour as the actuator in order to avoid misinterpret
...