IEC 60947-5-5:1997/AMD2:2016

Amendment 2 - Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function

Amendement 2 - 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

General Information

• Status: Published
• Publication Date: 28-Feb-2016
• ICS: 29.120.99 - Other electrical accessories
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Drafting Committee: WG 3 - TC 121/SC 121A/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 29-Feb-2016
• Completion Date: 15-Mar-2016

Relations

• Amends: IEC 60947-5-5:1997 - Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60947-5-5 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 2
AM ENDEMENT 2
Low-voltage switchgear and controlgear –
Part 5-5: Control circuit devices and switching elements – Electrical emergency
stop device with mechanical latching function

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 60947-5-5:1997-11/AMD2:2016-02(en-fr)

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IEC 60947-5-5 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 2
AM ENDEMENT 2
Low-voltage switchgear and controlgear –

Part 5-5: Control circuit devices and switching elements – Electrical emergency

stop device with mechanical latching function

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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.99, 29.130.20 ISBN 978-2-8322-3183-8

– 2 – IEC 60947-5-5:1997/AMD2:2016
© IEC 2016
FOREWORD
This amendment has been prepared by subcommittee SC 121A: Low-voltage switchgear and
controlgear, of IEC technical committee 121: Switchgear and controlgear and their
assemblies for low voltage.
The text of this amendment is based on the following documents:
FDIS Report of voting
121A/60/FDIS 121A/72/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
1 Scope
th
Delete, in the existing 4 paragraph “(see annex A)”.
th
Add, after the existing 4 paragraph, the following new paragraph and note:
This standard does not deal with any specific requirements on noise as the noise emission of
electrical emergency stop devices with mechanical latching function is not considered to be a
relevant hazard.
NOTE See also 9.2.5.4 of IEC 60204-1:2005.
2 Normative references
Delete, from the existing list, the references to IEC 60073:1996, modified by Amendment 1,
to ISO 3864 and IEC 60204-1.
Replace the existing reference to IEC 60068-2-1, modified by Amendment 1, by the following
new reference:
IEC 60068-2-1:2007, Environmental testing − Part 2-1: Tests − Test A: Cold
Replace the existing references to IEC 60068-2-2 modified by Amendment 1, IEC 60068-2-6,
IEC 60068-2-27, IEC 60068-2-30, IEC 60947-1 modified by Amendment 1, IEC 60947-5-1,
IEC 61310-1, and ISO 13850 by the following new references:
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat

© IEC 2016
IEC 60068-2-6:2007, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-27:2008, Environmental testing – Part 2-27: Tests – Test Ea and guidance:
Shock
IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-1:2007/AMD1:2010
IEC 60947-1:2007/AMD2:2014
IEC 60947-5-1:2016, Low-voltage switchgear and controlgear – Part 5-1: Control circuit
devices and switching elements – Electromechanical control circuit devices
IEC 61310-1:2007, Safety of machinery – Indication, marking and actuation – Part 1:
Requirements for visual, acoustic and tactile signals
ISO 13850:2015, Safety of machinery – Emergency stop function – Principles for design
Add the following new reference to the existing list:
IEC 60417-DB:2002 , Graphical symbols for use on equipment
3 Definitions
Replace the existing item under “D” modified by Amendment 1 by the following new item:
D
Direct opening action (of a contact element) . 3.9
Add the following new item under new ”P”:
P
Positive opening action (of a contact element) . 3.9
3.1
emergency stop (function or signal)
Replace the existing source by the following new source:
[ISO 13850:2015, definition 3.1, modified – extended to “emergency stop signal”, no use of E-
stop]
3.2
emergency stop device
Replace the existing definition and source by the following new definition, without modifying
the existing note:
manually operated control circuit device used to initiate an emergency stop function
_____________
“DB” refers to the IEC on-line database, available at: http://www.graphical-symbols.info/equipment.

– 4 – IEC 60947-5-5:1997/AMD2:2016
© IEC 2016
3.3
actuating system (of an emergency stop device)
Replace the existing definition and source by the following new definition and source:
mechanical parts which transmit the actuating force to the contact elements
[IEC 60050-441:1984, 441-15-21, modified – restricted to electromechanical emergency stop
devices; the note is not relevant anymore]
3.4
actuator (of an emergency stop device)
Replace the existing definition and source by the following new definition and source, without
modifying the existing note:
part of the actuating system which is actuated by a part of the human body
[IEC 60050-441:1984, 441-15-22, modified – actuation is intented to be achieved by human
only]
3.5
rest position
Replace the existing definition by the following new definition:
position of an emergency stop device, or of a part of it, which has not been actuated
3.6
actuated position
Replace the existing definition by the following new definition:
position of an emergency stop device, or of a part of it, after it has been actuated
3.8
resetting (of an emergency stop device)
Replace the existing note, modified by Amendment 1, by the following new note:
NOTE Examples of resetting include the rotation of a key, or of the actuator, pulling the actuator or pushing or
rotating a special reset button.
3.9
direct opening action (positive opening action) (of a contact element)
Replace the existing term, definition and source by the following new terms, definition and
source:
3.9
direct opening action (of a contact element)
DEPRECATED: positive opening action (of a contact element)
achievement of contact separation as the direct result of a specified movement of the switch
actuator through non-resilient members (for example not dependent upon springs)
[IEC 60947-5-1:2016, K.2.2, modified – addition of a deprecated term]
4.1 General
Replace the existing third dashed item in NOTE 1 by the following new dashed item:
– by a graphical symbol (see 4.2.2 or Table A.1 of IEC 61310-1:2007).

© IEC 2016
Delete the existing NOTE 2.
4.2.1
Replace the existing text by the following two new paragraphs and new figure:
Buttons used as emergency stop device actuators shall be coloured red. When a background
exists behind the actuator, it shall be coloured yellow.
Where a symbol is needed for clarification, the symbol IEC 60417-5638 (DB:2002-10) shall
be used (see Figure 2).
Figure 2 – Symbol (5638) for emergency stop
4.2.2
Replace the existing text and note as follows:
The direction of unlatching shall be identified when resetting is achieved by rotation of the
button. This identification shall have the same or nearly the same colour as the actuator in
order to avoid misinterpretation.
NOTE See also IEC 60073 and ISO 3864 series.
4.4 Additional requirements for colour coding
Replace the existing second paragraph, including the two dashed items, by the following:
Where 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.
5.1
Replace the existing paragraph of this subclause by the following new paragraph and note:
Depending on the associated devices, the utilization categories shall be one or more
categories selected from Table 1 of IEC 60947-5-1:2016.
NOTE For guidance refer to Annex K of IEC 60947-5-1:2016.
5.2
Replace the existing text of this subclause by the following new text:
All normally closed contact elements of an emergency stop device shall have a direct opening
action, in accordance with Annex K of IEC 60947-5-1:2016.
The tests shall be conducted according to Annex K of IEC 60947-5-1:2016.

– 6 – IEC 60947-5-5:1997/AMD2:2016
© IEC 2016
5.3
This correction does not apply to the English text.
5.4
Replace the existing note of this subclause, added by Amendment 1, by the following new
note:
NOTE Subclause 7.2.7 of IEC 60947-5-1:2016 only applies to control switches suitable for isolation.
Add, after the existing 5.4, the following new subclause 5.5:
5.5 Electrical requirements for functional safety applications: in cases where it is necessary
to obtain data, tests shall be made according to A.3.2.3 of this standard.
6.2.1
Replace the existing first paragraph of this subclause by the following new text, and delete
the existing footnote“*”:
When the emergency stop signal (including the necessary clearance distance) has been
generated during actuation of the emergency stop device, the emergency stop function 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-in without generating the emergency stop signal.
6.3.1
Replace the existing first paragraph of this subclause by the following new text:
The resetting of the latching means shall be by turning a key, by rotation in the designated
direction, or by a pulling motion.
6.3.2
Replace the existing text, modified by Amendment 1, by the following new text:
The emergency stop device shall be so designed that:
– the emergency stop actuator can be operated in a direction perpendicular to its mounting
surface;
– removal of the actuator is from the inside of the enclosure, or from the outside of the
enclosure by use of a tool intended for that purpose;
– it can be actuated by a one-handed continuous motion.
This shall be verified by inspection (see 7.2.1).
6.4.1
Replace the existing second dashed item by the following new dashed item:
– the installation of the emergency stop device can fulfil the requirements of 4.4.1 and 4.4.2
of ISO 13850:2015.
6.4.2
Replace the existing first paragraph of this subclause, modified by Amendment 1, including
the five dashed items, by the following:

© IEC 2016
When the actuator is installed according to the manufacturer’s instructions:
– the perpendicular pulling force, applied at the mid-length of the wire or rope, necessary
for generating the emergency stop signal (opening of the contacts), shall be less than
200 N;
– the perpendicular deflection of the wire or rope (at mid-length), necessary for generating
the emergency stop signal, shall be less than 400 mm;
– the breaking or disengagement of the wire or rope shall generate the emergency stop
signal;
– the wire or rope shall resist a tension force 10 times higher than the perpendicular pulling
force necessary for generating the emergency stop signal.
Delete the first sentence introduced by Amendment 1 following the dashed items.
Insert, after the existing 6.5, the following new Subclause 6.6:
6.6 Mechanical requirements for functional safety applications
In cases where it is necessary to obtain data needed for functional safety applications, tests
shall be made according to A.3.2.2 of this standard.
Table 1 – Robustness of a button-type actuator
Replace the existing table, introduced by Amendment 1, by the following new table:
Table 1 – Robustness of a button-type actuator
Mounting hole diameter Force Torque
mm N N m
+0,2
80 1,6
D16: 16,2
+0,4
D22: 22,3 110 2,2
+0,5
D30: 30,5 150 3,0
Add, after the new Table 1, the following new text:
For mounting holes having dimension other than in Table 1:
– force (in newton) shall be five times the largest dimension of the mounting hole (i.e., for a
square or rectangular hole, the diagonal measurement) in mm;
– torque (in newton meter) shall be equal to 0,1 time the largest dimension of the mounting
hole (i.e., for a square or rectangular hole, the diagonal measurement) in mm.
For an emergency stop button not mounted in a single hole:
– if the actuator diameter (or largest dimension) is less than 30 mm, use the values for
D22 mm;
– if the actuator diameter (or largest dimension) is equal to or greater than 30 mm, use the
values for D30 mm.
7.3.3 Durability test
Add the following sentence at the end of the second paragraph:

– 8 – IEC 60947-5-5:1997/AMD2:2016
© IEC 2016
For pushbuttons, the requirements of IEC 60947-5-1:2016, 8.3.2.1 a) applies.
Add the following sentence at the end of the third paragraph:
For the actuating forces, verification at the beginning and at the end is required.
7.4 Conditioning procedures
Add, at the end of the first paragraph, the following two new paragraphs:
Devices intended for mounting on enclosures shall be mounted for the purposes of this
conditioning in such a manner as to permit the entire emergency stop device to be exposed
to the conditioning media except for the exposure to salt mist in accordance with IEC 60068-
2-11. Devices subjected to salt mist may be either provided with their own enclosure, or
installed in an enclosure according to the manufacturer's instructions. The device is exposed
to the salt mist only outside the enclosure.
The device shall be rinsed clean before further tests are performed.
Replace the existing first bulleted item by the following new bulleted item:
• 96 h at +70 °C in dry atmosphere (see test Bb of IEC 60068-2-2 and IEC 60721-3-3
class 3K7)
Replace the existing third bulleted item by the following new bulleted item:
• 96 h at -40 °C (see IEC 60068-2-1: test Ab and IEC 60721-3-3 class 3K7)
7.7.2 Opening test
Replace, in the existing second paragraph of this subclause " K.8.3.4.4.1 of IEC 60947-5-1" by "
K.8.3.4.4.1 of IEC 60947-5-1:2016".
7.7.3 Latching test
Replace the existing title of this subclause by the following new title:
7.7.3 Latching test for button-type emergency stop device
Replace the existing first paragraph introduced in Amendment 1 by the following new
paragraph:
To simulate the typical human actuation of a button-type switch, the emergency stop device
and its actuator shall be mounted and tested by a pendulum-type hammer as shown in
Figure 1. The support of the device under test shall not move more than 0,1 mm when the
shock is applied (see IEC 60068-2-75).
Figure 1 – Hammer for tests
Replace the existing figure, modified by Amendment 1, by the following new figure:

© IEC 2016
Aluminium tube, diameter 20 mm,
thickness 1 mm
+3%
Length L: 1500
L
Rubber 45 shore A
Diameter:  20 mm
V = 0
Thickness: 18,5 mm
Device under test
V
max
h
m = 1,6 kg ± 2%
IEC
NOTE The 1,6 kg mass does not include the mass of the aluminium tube.
Figure 1 – Hammer for tests
Table 2 – Relationship between the emergency stop mounting hole and the hammer
height
Replace the existing table, introduced by Amendment 1, by the following new table:
Table 2 – Relationship between the emergency stop mounting hole
and the hammer height
Largest dimension Hammer height (h)
of mounting hole
mm mm
60 if the actuator diameter is < 30 mm
+0,2
D16: 16,2
75 if the actuator diameter is ≥ 30 mm
+0,4
D22: 22,3 75
+0,5
D30: 75
30,5
Add, after the new Table 2, the following three new paragraphs:
For mounting holes having dimension other than in Table 2 the hammer height shall be
75 mm.
For non-circular mounting holes, the largest dimension of the mounting hole (i.e. for a
rectangular hole, the diagonal) shall be used to determine the hammer height.
For an emergency stop button not mounted in a single hole:
– if the actuator diameter (or largest dimension) is less than 30 mm, use the values for
D22 mm;
– 10 – IEC 60947-5-5:1997/AMD2:2016
© IEC 2016
– if the actuator diameter (or largest dimension) is equal to or greater than 30 mm, use the
values for D30 mm.
Delete the last sentence of 7.7.3, modified by Amendment 1: "Other types are under
consideration".
7.7.4 Resetting test
Delete the existing item c).
7.7.5 Impact test for button-type actuators
Replace the first paragraph, introduced by Amendment 1, by the following new paragraph:
In order to verify 6.1.2 and 6.1.3 where applicable, the three sample emergency stop devices
are tested by striking each actuator three times with the hammer shown in Figure 1, where
h = 310 mm ± 2 mm.
Replace the last paragraph, introduced by Amendment, 1 by the following new paragraph:
After the third strike, the opening contact element shall meet the requirements of K.8.3.4.4.1
of IEC 60947-5-1:2016.
7.8.1 Disengagement of wire or rope
Replace the existing first paragraph by the following new paragraph:
In order to verify 6.4.2 where applicable, one emergency stop device is installed with the wire
or rope in accordance with the manufacturer's instructions.

© IEC 2016
Replace the existing Annex A, modified by Amendment 1, by the following new annex:
Annex A
(normative)
Procedure to determine reliability data for electrical emergency
stop devices used in functional safety applications
A.1 General
A.1.1 Overview
Provision of these data is optional, at the discretion of the manufacturer.
A.1.2 Scope and object
K.1.2 of IEC 60947-1:2007/AMD2:2014 applies with the following addition:
This annex addresses only the intended use of electromechanical contacts in control circuit
devices.
EXAMPLE The intended use for normally closed contacts is to open the circuit.
A.1.3 General requirements
K.1.3 of IEC 60947-1:2007/AMD2:2014 applies.
A.2 Terms, definitions and symbols
K.2 of IEC 60947-1:2007/AMD2:2014 applies.
A.3 Method based on durability test results
A.3.1 General method
In order to address random hardware failure the method is based on results given by
continuous monitoring of the electrical contacts under the appropriate durability test.
A.3.2 Test requirements
A.3.2.1 General
The test environment shall be in accordance with Clause 6 of IEC 60947-5-1:2016.
Every test shall be performed under the general conditions stated in 8.3.2.1 of IEC 60947-5-
1:2016, and at a rate equal (or, at the discretion of the manufacturer, higher) than that
declared by the manufacturer. The moving parts of the device shall reach their maximum
operating positions in both directions, as recommended by the manufacturer.
A.3.2.2 Mechanical durability
The mechanical durability of a control circuit device is defined as the number of no-load
operating cycles.
For the no-make current or no-break current utilization the mechanical durability is applicable.
...