IEC 62626-1:2014

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

IEC 62626-1:2014 applies to enclosed switches-disconnectors with rated voltages up to 1 000 V a.c. for repair and maintenance work or cleaning work in load circuits. Devices within the scope of this standard are derived from switch-disconnectors according to IEC 60947-3. Enclosed switch-disconnectors in this standard are suitable for isolation according to 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, quick start and stop or jogging.

Appareillage à basse tension sous enveloppe - Partie 1: Interrupteur-sectionneur en coffret, en dehors du domaine d'application de la norme CEI 60947-3, destiné à garantir l'isolation pendant les phases de maintenance

L'IEC 62626-1:2014 s'applique aux interrupteurs-sectionneurs sous enveloppe, ayant une tension assignée allant jusqu'à 1 000 V en courant alternatif, pour les travaux de réparation et de maintenance, ou pour les opérations de nettoyage de circuits de charge. Les appareillages entrant dans le cadre de cette norme sont similaires aux interrupteurs-sectionneurs selon la CEI 60947-3. Les interrupteurs-sectionneurs sous enveloppe conformes à la présente norme conviennent à une isolation selon la série CEI 60947 et ne sont pas supposés être équipés de dispositif de contrôle à distance ou de mise sous tension automatique, pour éviter des démarrages inattendus ou accidentels. Ces appareillages ne sont pas destinés à être utilisés pour une mise sous tension fonctionnelle, un démarrage et un arrêt rapide ou un fonctionnement par à-coups.

General Information

• Status: Published
• Publication Date: 13-Feb-2014
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.120.40 - Switches
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Drafting Committee: MT 6 - TC 121/SC 121A/MT 6
• Current Stage: DELPUB - Deleted Publication
• Start Date: 07-Nov-2023
• Completion Date: 10-Jun-2022

Relations

• Revised: IEC 62626-1:2023 - 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
• Effective Date: 05-Sep-2023

Overview

IEC 62626-1:2014 is an international standard that defines the requirements for enclosed switch-disconnectors used in low-voltage switchgear and controlgear. These devices are designed specifically for isolation purposes during repair, maintenance, or cleaning work in electrical circuits with rated voltages up to 1,000 V AC. Unlike operational switches covered by IEC 60947-3, these enclosed switch-disconnectors are outside its scope and are not intended for remote control, automatic switching, or operational switching tasks such as quick start, stop, or jogging.

Developed by the International Electrotechnical Commission (IEC), IEC 62626-1 emphasizes safety by ensuring reliable isolation to protect personnel working on electrical equipment, especially in motor circuits. The standard outlines classification, construction, performance, and testing criteria for these devices, commonly referred to as “maintenance switches” or “safety switches” (though the term may vary across regions).

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Key Topics

• Scope and Application
  IEC 62626-1 applies exclusively to enclosed switch-disconnectors intended for isolation during non-operational work such as repair, maintenance, and cleaning in low-voltage load circuits up to 1,000 V AC. It excludes equipment designed for operational switching functions to prevent inadvertent or accidental startup.

• Classification & Characteristics
  The standard defines distinct classes of enclosed switch-disconnectors based on their construction and intended use. It specifies performance characteristics, including mechanical strength, degree of protection against ingress and mechanical impacts, locking mechanisms for safety, and operational reliability.

• Construction Requirements
  Devices must meet criteria for secure enclosure, environmental resistance, and mechanical durability. Features including front marking and additional labeling ensure clear identification and correct use during maintenance tasks.

• Performance & Testing
  IEC 62626-1 sets minimum test requirements covering switching capacity and operational endurance. Type tests verify compliance with constructional and performance standards to guarantee safe isolation under specified electrical and environmental conditions.

• Markings and Product Information
  Manufacturers are required to provide clear product information, including front marking with standardized symbols denoting conformity to IEC 62626-1, operational instructions, and safety warnings, facilitating proper use to minimize risks during maintenance.

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Applications

• Maintenance of Electrical Motors
  Enclosed switch-disconnectors under IEC 62626-1 provide safe isolation points for motors and related electrical equipment during maintenance, ensuring the circuits are de-energized to protect workers from electrical hazards.

• Repair and Cleaning Tasks
  These devices isolate electrical circuits reliably without enabling quick switching or operational control, making them ideal for scenarios where accidental startup must be prevented while maintenance or cleaning is carried out on electrical systems.

• Industrial and Commercial Facilities
  The standard’s scope covers use in various low-voltage installations including manufacturing plants, commercial buildings, and other environments where safe electrical isolation is paramount before performing maintenance on electrical switchgear and controlgear.

• Safety Enhancement
  By conforming to this standard, manufacturers and users ensure their enclosed switch-disconnectors provide consistent and internationally recognized safety features to reduce risk of electric shock, unexpected startup, and related accidents during service activities.

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Related Standards

• IEC 60947 Series
  This series of standards deals with low-voltage switchgear and controlgear, including general rules (IEC 60947-1) and specific rules for switches, disconnectors, and switch-disconnectors (IEC 60947-3). IEC 62626-1 derives its device parameters from these standards but focuses on devices outside IEC 60947-3’s operational scope.

• IEC 62262
  Specifies the degree of protection against external mechanical impacts (IK code) for electrical enclosures, relevant for durability and strength requirements of enclosed switch-disconnectors under IEC 62626-1.

• IEC 60050
  The International Electrotechnical Vocabulary provides standardized definitions and terminology used throughout IEC 62626-1 to ensure precise and consistent communication in electrotechnical documentation.

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Keywords: IEC 62626-1, enclosed switch-disconnectors, low-voltage switchgear, electrical isolation, maintenance switches, safety switches, repair work isolation, IEC 60947 series, electrical equipment safety, low-voltage controlgear standards, enclosed switchgear, electrical maintenance safety.

Standards Content (Sample)

IEC 62626-1 ®
Edition 1.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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

Appareillage à basse tension sous enveloppe –
Partie 1: Interrupteur-sectionneur en coffret, en dehors du domaine d'application
de la norme CEI 60947-3, destiné à garantir l'isolation pendant
les phases de maintenance
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IEC 62626-1 ®
Edition 1.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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

Appareillage à basse tension sous enveloppe –

Partie 1: Interrupteur-sectionneur en coffret, en dehors du domaine

d'application de la norme CEI 60947-3, destiné à garantir l'isolation pendant

les phases de maintenance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX L
ICS 29.120.40, 29.130.20 ISBN 978-2-8322-1407-7

– 2 – 62626-1 © IEC:2014
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 7
5 Characteristics . 7
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 . 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 . 10
9.1 General . 10
9.2 Type tests . 10
Bibliography . 11

Figure 1 – Symbol for marking according to this standard . 8

Table 1 – Requirements and tests for devices . 10

62626-1 © IEC:2014 – 3 –
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

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62626-1 has been prepared by subcommittee SC17B: Low-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
The text of this standard is based on the following documents:
FDIS Report on voting
17B/1839A/FDIS 121A/3/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 62626-1 © IEC:2014
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 publication will remain unchanged until
the stability date indicated on the IEC web site 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.
62626-1 © IEC:2014 – 5 –
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
standard.
This part of IEC 62626 specifies additional requirements for enclosed switch-disconnectors
according to IEC 60947-3 to provide isolation of electrical equipment during repair and
maintenance work.
Enclosed switch-disconnectors according to this standard are mounted close to the equipment
which has to be isolated and are usually operated by instructed persons.
NOTE 1 The term “safety switch” is not recognized in some countries as the same meaning given in this standard.
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 – 62626-1 © IEC:2014
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

1 Scope
This part of IEC 62626 applies to enclosed switches-disconnectors with rated voltages up to
1 000 V a.c. for repair and maintenance work or cleaning work in load circuits. Devices within
the scope of this standard are derived from switch-disconnectors according to IEC 60947-3.
Enclosed switch-disconnectors in this standard are suitable for isolation according to
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, quick start and stop or jogging.
NOTE 1 However, these 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 standard 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 standard 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, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
Amendment 1:2010
IEC 60947-3:2008, Low-voltage switchgear and controlgear – Part 3: Switches, disconnector,
switch-disconnector 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)

62626-1 © IEC:2014 – 7 –
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, as well as the following apply.
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 according to this standard 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.
Both are specified in Table 1.
5 Characteristics
Clause 4 of IEC 60947-3:2008, Amendment 1:2012 applies.

– 8 – 62626-1 © IEC:2014
6 Product information
6.1 Nature of information
Subclause 5.1 of IEC 60947-1:2007, Amendment 1:2010 applies with the following additional
dashed item under list of “Characteristics”:
– corresponding class of this standard.
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 name-plate or
name-plates 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
respectively indicated by the graphical symbols (IEC 60417-5008 (2002-10)) and
(IEC 60417-5007 (2002-10)), see 7.1.6.1 of IEC 60947-1:2007.
b) Symbol for marking according to this standard, see Figure 1.
IEC  0547/14
Figure 1 – Symbol for marking according to this standard
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.
6.2.2 Additional marking
The following information shall be marked on the equipment, but does not need to be visible
from the front when the device is mounted:
a) manufacturer's name or trade mark;
b) type designation or serial number;

62626-1 © IEC:2014 – 9 –
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 standard.
7 Normal service, mounting and transport conditions
Clause 6 of IEC 60947-3:2008 applies, as applicable.
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.
Subclause 7.1 of IEC 60947-3:2008, Amendment 1:2012 applies, as applicable.
8.1.2 Locking
The locking means shall be designed in such a way that the device can be padlocked in 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.
8.1.5 Degree of protection
The device shall have a minimum degree of protection according to 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
Subclause 7.2 of IEC 60947-3:2008, Amendment 1:2012 applies, as applicable.
8.2.2 Switching capacity
The device shall have a utilization category according to Table 1.
The device shall be designed for uninterrupted duty (see 4.3.4.2 of IEC 60947-1:2007).

– 10 – 62626-1 © IEC:2014
9 Tests
9.1 General
Clause 8 of IEC 60947-3:2008, Amendment 1:2012 applies, as applicable.
9.2 Type tests
The type tests listed in Table 1 shall be carried out in addition to the tests according to
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
Mechanical strength of the device IK06 IK09 IEC 62262:2002, 4.1,
b
4.2, 4.3
Degree of protection of the device IP54 IP65 IEC 60947-1:2007,
Annex C
Opening of the enclosure is possible only with tools Yes Yes Visual inspection
e f
Opening of the enclosure in OFF-position when padlocked – No V
...