IEC 62626-1:2023

IEC 62626-1 ®
Edition 2.0 2023-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear enclosed equipment –
Part 1: Enclosed switch-disconnectors outside the scope of IEC 60947-3
to provide isolation during repair and maintenance work
Additional requirements for enclosed switch-disconnectors in accordance with
IEC 60947-3 – Isolation of electrical equipment during repair and maintenance
work in specific applications
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IEC 62626-1 ®
Edition 2.0 2023-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear enclosed equipment –
Part 1: Enclosed switch-disconnectors outside the scope of IEC 60947-3
to provide isolation during repair and maintenance work
Additional requirements for enclosed switch-disconnectors in accordance with
IEC 60947-3 – Isolation of electrical equipment during repair and maintenance
work in specific applications
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.40, 29.130.20 ISBN 978-2-8322-7829-1
– 2 – IEC 62626-1:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 2
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 8
5 Characteristics . 8
6 Product information . 8
6.1 Nature of information . 8
6.2 Markings . 8
6.2.1 Front-marking . 8
6.2.2 Additional marking . 8
7 Normal service, mounting and transport conditions Void . 9
8 Constructional and performance requirements . 9
8.1 Constructional requirements . 9
8.1.1 General . 9
8.1.2 Locking . 9
8.1.3 Environmental influences . 9
8.1.4 Mechanical strength. 9
8.1.5 Degree of protection . 10
8.1.6 Operation/actuation . 10
8.2 Performance requirements . 10
8.2.1 General . 10
8.2.2 Switching capacity . 10
9 Tests . 10
9.1 General . 10
9.2 Type tests . 10
Bibliography . 12

Figure 1 – Symbol for marking in accordance with this document . 8

Table 1 – Requirements and tests for devices . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
ENCLOSED EQUIPMENT –
Part 1: Enclosed switch-disconnectors outside the scope of IEC 60947-3
to provide isolation during repair and maintenance work
Additional requirements for enclosed switch-disconnectors in accordance
with IEC 60947-3 – Isolation of electrical equipment during repair and
maintenance work in specific applications

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) 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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 62626-1:2014. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
– 4 – IEC 62626-1:2023 RLV © IEC 2023
IEC 62626-1 has been prepared by subcommittee SC121A: 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 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) update of this document based on IEC 60947-1:2020.
The text of this International Standard is based on the following documents:
Draft Report on voting
121A/569/FDIS 121A/581/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.
A list of all parts in the IEC 62626 series, published under the general title Low-voltage
switchgear and controlgear enclosed equipment, 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.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

INTRODUCTION
Enclosed switch-disconnectors covered by this part of IEC 62626 are intended for use in various
applications, to provide isolation of electrical equipment, especially motor circuits, during repair,
cleaning and maintenance works.
Such enclosed switch-disconnectors are sometimes known as “maintenance switches”, or
“safety switches”. The name “safety switch” is also used for safety related position switches,
inspection switches and switches for other applications, which are not covered by this
document.
This part of IEC 62626 specifies additional requirements for enclosed switch-disconnectors in
accordance with IEC 60947-3 to provide isolation of electrical equipment during repair and
maintenance work.
Enclosed switch-disconnectors in accordance with this document are mounted close to the
equipment which has to be being isolated and are usually operated by instructed persons.
NOTE 1 The term “safety switch” is not recognized in some countries as having the same meaning as given in this
document.
NOTE 2 Switch-disconnectors do not necessarily meet the requirements for prevention of unexpected start,
especially if there are energy sources other than electrical.

– 6 – IEC 62626-1:2023 RLV © IEC 2023
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
ENCLOSED EQUIPMENT –
Part 1: Enclosed switch-disconnectors outside the scope of IEC 60947-3
to provide isolation during repair and maintenance work
Additional requirements for enclosed switch-disconnectors in accordance
with IEC 60947-3 – Isolation of electrical equipment during repair and
maintenance work in specific applications

1 Scope
This part of IEC 62626 applies to enclosed switches-disconnectors with rated voltages up to
1 000 V AC for repair and maintenance work or cleaning work in load circuits. Devices within
the scope of this document are derived from switch-disconnectors in accordance with
IEC 60947-3 with specific additional requirements. Enclosed switch-disconnectors in this
document are suitable for isolation in accordance with the IEC 60947 series and are not
supposed to be equipped with means for remote control or automatic switching to avoid
unexpected or accidental start. These devices are not intended to be used for operational
switching, for example quick start and stop or, jogging.
NOTE 1 However, this kind of devices can provide the possibility to switch off electrical equipment (even in a critical
situation or not).
Devices within the scope of this document provide isolation of electrical equipment, especially
in motor circuits, during repair and maintenance or cleaning works.
Enclosed switch-disconnectors for various applications to provide isolation of electrical
equipment during repair and maintenance work, named “maintenance switches”, are designated
hereafter as devices with:
a) different classes;
b) characteristics of each class;
c) minimum test requirements;
d) information to be marked on the equipment or made available by the manufacturer, for
example in the catalogue.
NOTE 2 This document does not specify additional requirements that are necessary for the application of these
switches, for example, in explosive atmospheres (e.g. ATEX in Europe).
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 60050 (all parts), International electrotechnical vocabulary. Available from:

IEC 60050-441, International Electrotechnical Vocabulary (IEV) – Part 441: Switchgear,
controlgear and fuses (available at www.electropedia.org)
IEC 60947-1:20072020, Low-voltage switchgear and controlgear – Part 1: General rules
Amendment 1:2010
IEC 60947-3:20082020, Low-voltage switchgear and controlgear – Part 3: Switches,
disconnectors, switch-disconnectors and fuse-combination units
Amendment 1:2012
IEC 62262:2002, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62262:2002/AMD1:2021
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-441,
IEC 60947-1, IEC 60947-3 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
(mechanical) switch
mechanical switching device capable of making, carrying and breaking currents under normal
circuit conditions which may include specified operating overload conditions and also carrying
for a specified time currents under specified abnormal circuit conditions such as those of short-
circuit
Note 1 to entry: A switch may be capable of making, but not breaking, short-circuit currents.
[SOURCE: IEC 60050-441:1984, 441-14-10]
3.2
disconnector
mechanical switching device which, in the open position, complies with the requirements
specified for the isolating function
Note 1 to entry: A disconnector is capable of opening and closing a circuit when either a negligible current is broken
or made, or when no significant change in the voltage across the terminals of each of the poles of the disconnector
occurs. It is also capable of carrying currents under normal circuit conditions and carrying for a specified time currents
under abnormal conditions such as those of short-circuit.
[SOURCE: IEC 60050-441:1984, 441-14-05, modified – reference has been made to the
isolating function instead of the isolating distance.]
3.3
switch-disconnector
switch which, in the open position, satisfies the isolating requirements specified for a
disconnector
[SOURCE: IEC 60050-441:1984, 441-14-12]
3.4
enclosed switch
switch with a dedicated enclosure, providing a specified degree of protection against certain
external influences
– 8 – IEC 62626-1:2023 RLV © IEC 2023
4 Classification
Devices in accordance with this document are classified into two classes, class 0 and class 1.
Class 0 is the minimum requirement level, as class 1 is this required by harsh and rough/heavy
duty conditions, for example for chemical industries. Class 0 is the minimum requirement;
class 1 is the class required when specified by the user, for example the chemical industry, for
their more demanding environment.
Both are specified in Table 1.
5 Characteristics
IEC 60947-3:20082020, Clause 5, applies.
6 Product information
6.1 Nature of information
IEC 60947-1:20072020, 6.1, applies with the following additional dashed item under the list of
characteristics:
– corresponding class of this document.
6.2 Markings
6.2.1 Front-marking
Each device shall be marked in a durable and legible manner with the following data.
The markings for a), b) and c) below shall be on the equipment itself or on a nameplate or
nameplates attached to the device and shall be located at a place such that they are legible
from the front after mounting the equipment in accordance with the manufacturer's instructions.
a) Indication of the open and closed position. The open and closed position shall be indicated
by the graphical symbols (IEC 60417-5008:2002-10) and (IEC 60417-5007:2002-10),
respectively, see IEC 60947-1:20072020, 8.1.6.1.
b) Symbol for marking in accordance with this document, see Figure 1.

Figure 1 – Symbol for marking in accordance with this document
c) A corrosion-resistant label or plate marked with the text “maintenance switch” or translated
in national language. The label or plate shall be colored according to national practice.

The height of the text shall be at least 5 mm. The text “maintenance switch” shall be marked
in a durable and legible manner and the color of the text shall be different from the color of
the label or plate.
NOTE The translations of the terms “maintenance switch” on the label into different languages can be for
example “interrupteur de maintenance”, “Sicherheitschalter”, or equivalent translations in other languages.
A corrosion-resistant label or plate marked with the text in a minimum of 5 mm high
characters, “maintenance switch”. National regulations can apply.
6.2.2 Additional marking
The following information shall be marked on the equipment, but it is not necessary that it be
visible from the front when the device is mounted:
a) manufacturer's name or trademark;
b) type designation or serial number;
c) rated operational current (or rated power) at the rated operational voltage;
d) value (or range) of the rated frequency
e) number of this standard (IEC 62626-1) including class (see Clause 4), if the manufacturer
claims compliance with this document;
f) class 0 or class 1 as applicable to the device.
7 Normal service, mounting and transport conditions
Clause 6 of IEC 60947-3:2008 applies, as applicable.
Void
8 Constructional and performance requirements
8.1 Constructional requirements
8.1.1 General
To fulfill the safety disconnection requirements, it is necessary to have both a switch for start
and stop and a separate maintenance switch. A maintenance switch shall not be equipped with
means for remote control or automatic switching.
IEC 60947-3:20082020, 8.1, applies.
8.1.2 Locking
The locking means shall be designed in such a way that the device can be padlocked in the
OFF position. The requirements for padlocking and opening of the enclosure are given in
Table 1.
8.1.3 Environmental influences
The corrosion resistance of the device shall be tested. Requirements for corrosion resistance
are given in Table 1.
8.1.4 Mechanical strength
The mechanical strength of the device shall be tested. Requirements for mechanical strength
are given in Table 1.
– 10 – IEC 62626-1:2023 RLV © IEC 2023
8.1.5 Degree of protection
The device shall have a minimum degree of protection in accordance with Table 1.
8.1.6 Operation/actuation
Actuators mounted on removable covers or on panel or cabinet doors shall be so designed that,
when the covers are replaced or the doors closed, the actuator will engage correctly with the
associated mechanism.
8.2 Performance requirements
8.2.1 General
IEC 60947-3:20082020, 8.2, applies.
8.2.2 Switching capacity
The device shall have a utilization category in accordance with Table 1.
The device shall be designed for uninterrupted duty (see 4.3.4.2 of IEC 60947-1:2007).
9 Tests
9.1 General
IEC 60947-3:20082020, Clause 9, applies.
9.2 Type tests
The type tests listed in Table 1 shall be carried out in addition to the tests in accordance with
IEC 60947-3:2008, Amendment 1:2012.
For each test a new sample may be used.

Table 1 – Requirements and tests for devices
Item Requirements Tests
Class 0 Class 1
a
IK06 IK09 IEC 62262:2002 and
Mechanical strength of the device
IEC 62262:2002/AMD1:
b
2021, 4.1, 4.2, 4.3
Degree of protection of the device IP54 IP65 IEC 60947-
1:20072020, Annex C
Opening of the enclosure is possible only with tools Yes Yes Visual inspection
e f
Opening of the enclosure (with tools) in OFF position Visual inspection
– No
when padlocked
Damp heat, salt mist and vibrations Category A Categories IEC 60947-
d
C and D
1:20072020, Annex Q
Utilization category AC-23B AC-3 IEC 60947-3
c
Padlocking capability, minimum value 3 IEC 60947-
1:20072020, 8.1.7.3
a
For this test the device is in the OFF position and locked with only one padlock.
b
Device condition during and after the test:
− the device is in the OFF position and locked;
− closing of contacts is considered as a failure;
− padlocking capability shall remain;
− after the test the degree of protection shall not be less than IP54.
c
Use of accessories is allowed to gain minimum value.
d
For these special tests, IEC 60947-1:20072020, Annex Q, applies with the following additions:
– where IEC 60947-1:20072020, Table Q.1, calls for verification of operational capability, this shall be made
by carrying out five ON and OFF operations;
– the vibration tests shall be done on the devices with the contacts in the open and closed position. During the
test unintended opening or closing of the contacts is not allowed. To check the contacts, tests may be done
under any current /or voltage value;
– for low temperature tests, devices shall not be energized during conditioning and testing, except for
functional tests.
By agreement of the manufacturer, the duration of the recovery periods may be reduced.
e
No requirement specified.
f
Device damaged after opening.
– 12 – IEC 62626-1:2023 RLV © IEC 2023
Bibliography
IEC 60204-1, Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 60364-5-51, Electrical installations of buildings – Part 5-51: Selection and erection of
electrical equipment – Common rules
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60947 (all parts), Low-voltage switchgear and controlgear
IEC 60947-5-1, Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and
switching elements – Electromechanical control circuit devices
ISO 13850, Safety of machinery – Emergency stop function – Principles for design

___________
IEC 62626-1 ®
Edition 2.0 2023-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear enclosed equipment –
Part 1: Additional requirements for enclosed switch-disconnectors in
accordance with IEC 60947-3 – Isolation of electrical equipment during repair
and maintenance work in specific applications

Appareillage à basse tension sous enveloppe –
Partie 1: Exigences supplémentaires relatives aux interrupteurs‑sectionneurs
sous enveloppe conformes à l’IEC 60947-3 – Isolation du matériel électrique lors
des travaux de réparation et de maintenance dans des applications spécifiques
– 2 – IEC 62626-1:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 7
5 Characteristics . 8
6 Product information . 8
6.1 Nature of information . 8
6.2 Markings . 8
6.2.1 Front-marking . 8
6.2.2 Additional marking . 8
7 Void . 9
8 Constructional and performance requirements . 9
8.1 Constructional requirements . 9
8.1.1 General . 9
8.1.2 Locking . 9
8.1.3 Environmental influences . 9
8.1.4 Mechanical strength. 9
8.1.5 Degree of protection . 9
8.1.6 Operation/actuation . 9
8.2 Performance requirements . 9
8.2.1 General . 9
8.2.2 Switching capacity . 9
9 Tests . 9
9.1 General . 9
9.2 Type tests . 10
Bibliography . 11

Figure 1 – Symbol for marking in accordance with this document . 8

Table 1 – Requirements and tests for devices . 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
ENCLOSED EQUIPMENT –
Part 1: Additional requirements for enclosed switch-disconnectors in
accordance with IEC 60947-3 – Isolation of electrical equipment during
repair and maintenance work in specific applications

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) 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 62626-1 has been prepared by subcommittee SC121A: 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 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) update of this document based on IEC 60947-1:2020.

– 4 – IEC 62626-1:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
121A/569/FDIS 121A/581/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.
A list of all parts in the IEC 62626 series, published under the general title Low-voltage
switchgear and controlgear enclosed equipment, 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.
INTRODUCTION
Enclosed switch-disconnectors covered by this part of IEC 62626 are intended for use in various
applications, to provide isolation of electrical equipment, especially motor circuits, during repair,
cleaning and maintenance works.
Such enclosed switch-disconnectors are sometimes known as “maintenance switches”, or
“safety switches”. The name “safety switch” is also used for safety related position switches,
inspection switches and switches for other applications, which are not covered by this
document.
This part of IEC 62626 specifies additional requirements for enclosed switch-disconnectors in
accordance with IEC 60947-3 to provide isolation of electrical equipment during repair and
maintenance work.
Enclosed switch-disconnectors in accordance with this document are mounted close to the
equipment being isolated.
NOTE 1 The term “safety switch” is not recognized in some countries as having the same meaning as given in this
document.
NOTE 2 Switch-disconnectors do not necessarily meet the requirements for prevention of unexpected start,
especially if there are energy sources other than electrical.

– 6 – IEC 62626-1:2023 © IEC 2023
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
ENCLOSED EQUIPMENT –
Part 1: Additional requirements for enclosed switch-disconnectors in
accordance with IEC 60947-3 – Isolation of electrical equipment during
repair and maintenance work in specific applications

1 Scope
This part of IEC 62626 applies to enclosed switches-disconnectors with rated voltages up to
1 000 V AC for repair and maintenance work or cleaning work in load circuits. Devices within
the scope of this document are switch-disconnectors in accordance with IEC 60947-3 with
specific additional requirements. Enclosed switch-disconnectors in this document are suitable
for isolation in accordance with the IEC 60947 series and are not equipped with means for
remote control or automatic switching to avoid unexpected or accidental start. These devices
are not used for operational switching, for example quick start and stop, jogging.
NOTE 1 However, this kind of devices can provide the possibility to switch off electrical equipment (even in a critical
situation or not).
Devices within the scope of this document provide isolation of electrical equipment, especially
in motor circuits, during repair and maintenance or cleaning works.
Enclosed switch-disconnectors for various applications to provide isolation of electrical
equipment during repair and maintenance work, named “maintenance switches”, are designated
hereafter as devices with:
a) different classes;
b) characteristics of each class;
c) minimum test requirements;
d) information to be marked on the equipment or made available by the manufacturer, for
example in the catalogue.
NOTE 2 This document does not specify additional requirements that are necessary for the application of these
switches, for example, in explosive atmospheres (e.g. ATEX in Europe).
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 60050-441, International Electrotechnical Vocabulary (IEV) – Part 441: Switchgear,
controlgear and fuses (available at www.electropedia.org)
IEC 60947-1:2020, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-3:2020, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 62262:2002, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62262:2002/AMD1:2021
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-441,
IEC 60947-1, IEC 60947-3 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
(mechanical) switch
mechanical switching device capable of making, carrying and breaking currents under normal
circuit conditions which may include specified operating overload conditions and also carrying
for a specified time currents under specified abnormal circuit conditions such as those of short-
circuit
Note 1 to entry: A switch may be capable of making, but not breaking, short-circuit currents.
[SOURCE: IEC 60050-441:1984, 441-14-10]
3.2
disconnector
mechanical switching device which, in the open position, complies with the requirements
specified for the isolating function
Note 1 to entry: A disconnector is capable of opening and closing a circuit when either a negligible current is broken
or made, or when no significant change in the voltage across the terminals of each of the poles of the disconnector
occurs. It is also capable of carrying currents under normal circuit conditions and carrying for a specified time currents
under abnormal conditions such as those of short-circuit.
[SOURCE: IEC 60050-441:1984, 441-14-05, modified – reference has been made to the
isolating function instead of the isolating distance.]
3.3
switch-disconnector
switch which, in the open position, satisfies the isolating requirements specified for a
disconnector
[SOURCE: IEC 60050-441:1984, 441-14-12]
3.4
enclosed switch
switch with a dedicated enclosure, providing a specified degree of protection against certain
external influences
4 Classification
Devices in accordance with this document are classified into two classes, class 0 and class 1.
Class 0 is the minimum requirement; class 1 is the class required when specified by the user,
for example the chemical industry, for their more demanding environment.
Both are specified in Table 1.

– 8 – IEC 62626-1:2023 © IEC 2023
5 Characteristics
IEC 60947-3:2020, Clause 5, applies
...