SKA - Switchgear and control gear

This part of IEC 62271 applies to AC contactors and/or contactor-based controllers and motorstarters designed for indoor installation and operation at frequencies up to and including 60 Hz on systems having voltages above 1 kV and up to and including 24 kV. This document also includes additional requirements for outdoor installations where the equipment is housed in an additional protective enclosure. It is applicable only to three-pole devices for use in three-phase systems, and single-pole devices for use in single-phase systems. Two-pole contactors and starters for use in single-phase systems are subject to agreement between manufacturer and user. Contactors and/or starters dealt with in this document typically do not have adequate short-circuit interruption capability. In this context, this document gives requirements for: - starters associated with separate short-circuit protective devices; - controllers - contactors combined with short-circuit protective devices (SCPD). Contactors intended for closing and opening electric circuits and, if combined with suitable relays, for protecting these circuits against operating overloads are covered in this document. This document is also applicable to the operating devices of contactors and to their auxiliary equipment. Motor-starters intended to start and accelerate motors to normal speed, to ensure continuous operation of motors, to switch off the supply from the motor and to provide means for the protection of motors and associated circuits against operating overloads are dealt with. Motor-starter types included are: - direct-on-line starters; - reversing starters; - two-direction starters; - reduced kVA (voltage) starters; - auto-transformer starters; - rheostatic starters; - reactor starters. This document does not apply to: - circuit-breaker-based motor-starters; - single-pole operation of multi-pole contactors or starters; - two-step auto-transformer starters designed for continuous operation in the starting position; - unbalanced rheostatic rotor starters, i.e. where the resistances do not have the same value in all phases; - equipment designed not only for starting, but also for adjustment of speed; - liquid starters and those of the "liquid-vapour" type; - semiconductor contactors and starters making use of semiconductor contactors in the main circuit; - rheostatic stator starters; - contactors or starters designed for special applications. This document does not deal with components contained in contactors and contactor-based motor-starters, for which individual specifications exist. NOTE 1 Thermal electrical relays are covered by IEC 60255-149. NOTE 2 High-voltage current-limiting fuses are covered by IEC 60282-1 and IEC 60644. NOTE 3 Metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV are covered by IEC 62271-200. NOTE 4 Disconnectors and earthing switches are covered by IEC 62271-102. NOTE 5 High-voltage switches above 1 kV and less than 52 kV are covered by IEC 62271-103. The object of this document is to state: a) the characteristics of contactors and starters and associated equipment; b) the conditions with which contactors or starters comply with reference to: 1) their operation and behaviour, 2) their dielectric properties, 3) the degrees of protection provided by their enclosures, where applicable, 4) their construction, 5) for controllers, interactions between the various components, for example SCPD co-ordination; c) the tests intended for confirming that these conditions have been met, and the methods to be adopted for these tests; d) the information to be given with the equipment or in the manufacturer's literature.

This part of IEC 61439 defines the specific requirements for the power switchgear and
controlgear assembly (abbreviated ‘PSC-assembly’ throughout this document see 3.1.101) as
follows:
• assemblies for which the rated voltage does not exceed 1 000 V AC or 1 500 V DC;
• assemblies designed for a nominal frequency of the incoming supply or supplies not
exceeding 1 000 Hz;
NOTE 1 Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007, 5.3.3.2.5
to take into account additional constraints to insulation coordination.
• assemblies intended for indoor and outdoor applications;
• stationary or movable assemblies with or without enclosures;
• assemblies intended for use in connection with the generation, transmission, distribution
and conversion of electrical energy, and for the control of equipment consuming electrical
energy and for associated data processing;
• assemblies designed for use under special service conditions, for example in ships and in
rail vehicles, provided that the other relevant specific requirements are complied with;
NOTE 2 Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.
This document also applies to assemblies for use in photovoltaic installations, designated as
photovoltaic assemblies (PVA). The particular characteristics, specific service conditions and
the requirements for PVA’s are included in Annexes DD, EE and FF.
This document provides supplementary requirements for PSC-assemblies intended for use as
part of the electrical equipment of machines and can be applied in addition to the
requirements given in IEC 60204-1.
This document applies to all assemblies whether they are designed, manufactured and
verified on a one-off basis or fully standardised and manufactured in quantity.
The manufacture and/or assembly can be carried out by an entity other than the original
manufacturer (see 3.10.1 of IEC 61439-1:2020).
This document does not apply to individual devices, for example, circuit-breakers, fuse
switches and self-contained components such as, motor starters, power electronic converter
systems and equipment (PECS), switch mode power supplies (SMPS), uninterruptable power
supplies (UPS), basic drive modules (BDM), complete drive modules (CDM), adjustable speed
power drives systems (PDS), stand-alone energy storage systems (battery and capacitor
systems), and other electronic equipment which comply with their relevant product standards.
This document describes their integration into a PSC-assembly or an empty enclosure used
as a part of a PSC-assembly.
For some applications, such as, explosive atmospheres, functional safety, there may be a
need to comply with the requirements of other standards or legislation in addition to those
specified in the IEC 61439 series.
This document does not apply to the specific types of assemblies covered by other parts of
IEC 61439. For assemblies not covered by other parts, this part applies.
Unless local legislation details additional requirements, equipment within the scope of this
document, which complies with this document, is deemed to meet essential safety
requirements. This includes fully verified specifier options, for example user choice of
protection against accidental contact with hazardous live parts of IPXXB or IP3XD. Where
special requirements are agreed between the user and manufacturer, that are not fully
specified within this document, for example, (i) part of the assembly is outside the scope of
this document, (ii) exceptional vibration is present at the place of installation, (iii) exceptional
voltage variations occur in service, or (iv) possible adverse effects from sonic or ultrasonic
sources, a risk assessment and/or additional or more severe verifications may be required to
demonstrate that the essential safety requirements have been fulfilled.

This part of IEC 61439 lays down the general definitions and service conditions, construction
requirements, technical characteristics and verification requirements for low-voltage
switchgear and controlgear assemblies.
NOTE Throughout this document, the term assembly(s) (see 3.1.1) is used for a low-voltage switchgear and
controlgear assembly(s).
For the purpose of determining assembly conformity, the requirements of the relevant part of
the IEC 61439 series, Part 2 onwards, apply together with the cited requirements of this
document. For assemblies not covered by Part 3 onward, Part 2 applies.
This document applies to assemblies only when required by the relevant assembly standard
as follows:
– assemblies for which the rated voltage does not exceed 1 000 V AC or
1 500 V DC;
– assemblies designed for a nominal frequency of the incoming supply or supplies not
exceeding 1 000 Hz;
– assemblies intended for indoor and outdoor applications;
– stationary or movable assemblies with or without an enclosure;
– assemblies intended for use in connection with the generation, transmission, distribution
and conversion of electric energy, and for the control of electrical energy consuming
equipment.
This document does not apply to individual devices and self-contained components such as
motor starters, fuse switches, power electronic converter systems and equipment (PECS),
switch mode power supplies (SMPS), uninterruptable power supplies (UPS), basic drive
modules (BDM), complete drive modules (CDM), adjustable speed power drives systems
(PDS), and other electronic equipment which comply with their relevant product standards.
This document describes the integration of devices and self-contained components into an
assembly or into an empty enclosure forming an assembly.
For some applications involving, for example, explosive atmospheres, functional safety, there
can be a need to comply with the requirements of other standards or legislation in addition to
those specified in the IEC 61439 series.

2021-04-30 - IEC Corrected version

This part of IEC 60947 series specifies requirements for three-position enabling switches.
These switches are used as components of enabling devices to provide signals that,
a) when activated, allow machine operation to be initiated by a separate start control, and
b) when de-activated,
– initiate a stop function, and
– prevent initiation of machine operation.
NOTE 1 The enabling control function is described in 9.2.3.9 of IEC 60204-1:2016 but the application of threeposition
enabling switches is not limited to a component of the enabling device described in IEC 60204-1.
NOTE 2 This document does not deal with enabling devices.
These switches are intended to be connected to circuits which rated voltage does not exceed
250 V AC 50 Hz/60 Hz or 300 V DC.
EXAMPLE Devices incorporating three-position enabling switches are:
– push-button enabling devices;
– grip actuated enabling devices;
– foot actuated enabling devices.
See Annex A for more typical examples.
This document does not apply to:
– three-position enabling switches for non-electrical control circuits, for example hydraulic,
pneumatic;
– enabling switches without three-position mechanism;
– emergency stop devices (see IEC 60947-5-5).

This document applies, when required by the relevant product standard, to low-voltage
switchgear and controlgear hereinafter referred to as "equipment" or “device” and intended to
be connected to circuits, the rated voltage of which does not exceed 1 000 V AC or
1 500 V DC.
This document states the general rules and common safety requirements for low-voltage
switchgear and controlgear, including:
− definitions;
− characteristics;
− information supplied with the equipment;
− normal service, mounting and transport conditions, decommissioning and dismantling;
− constructional and performance requirements;
− verification of characteristics and performance;
− energy efficiency aspects (see Annex V);
− environmental aspects.
This document does not apply to:
− low-voltage switchgear and controlgear assemblies which are dealt with in IEC 61439
series, as applicable;
− terminals for connection of aluminium conductors;
NOTE Terminals for aluminium conductors are under consideration for the next revision.
− use within explosive atmospheres (see IEC 60079 series);
− software and firmware requirements for functional safety application (see IEC 61508-3);
− cyber security aspects (see IEC 62443 series).

This part of IEC 60947 applies to switches, disconnectors, switch-disconnectors and fusecombination
units and their dedicated accessories to be used in distribution circuits and motor
circuits of which the rated voltage does not exceed 1 000 V AC or 1 500 V DC.
NOTE 1 Accessories are interconnecting units, extended terminals, internal coils, auxiliary contacts, motor
operator, etc. offered as options with the basic unit.
This document does not apply to equipment coming within the scope of IEC 60947-2, IEC 60947-4-
1 and IEC 60947-5-1.
Particular requirements for switches, disconnectors, switch-disconnectors and fusecombination
units for use in photovoltaic (PV) DC applications are given in Annex D.
Specific requirements for LV switchgear intended for the connections of aluminium conductors
are given in Annex E.
Guidance on measurement of power loss is provided in Annex F.
This document does not include the additional requirements necessary for electrical
apparatus for explosive gas atmospheres.
NOTE 2 Depending on its design, a switch (or disconnector) can be referred to as "a rotary switch
(disconnector)", "cam-operated switch (disconnector)", "knife-switch (disconnector)", etc.
NOTE 3 In this document, the word "switch" also applies to the apparatus referred to in French as
"commutateurs", intended to modify the connections between several circuits and inter alia to substitute a part of a
circuit for another.
NOTE 4 In general, throughout this document, switches, disconnectors, switch-disconnectors and fusecombination
units will be referred to as "equipment".
The object of this document is to state:
a) the characteristics of the equipment;
b) the conditions that apply to the equipment with reference to:
1) operation and behaviour in normal service;
2) operation and behaviour in case of specified abnormal conditions, e.g. short-circuit;
3) dielectric properties;
c) the tests for confirming that these conditions have been met and the methods that are
adopted for these tests;
d) the information relevant to the marking of the equipment or made available by the
manufacturer, e.g. in the catalogue.
Specific items requiring agreement between the user and the manufacturer are identified in
Annex B.

IEC 61439-7:2018 defines the specific requirements of assemblies as follows:
- assemblies for which the rated voltage does not exceed 1 000 V in the case of AC or 1 500 V in the case of DC;
– assemblies intended for use in connection with the generation, transmission, distribution and conversion of electric energy, and for the control of electric energy consuming equipment;
– assemblies operated by ordinary persons (e.g. plug and unplug of electrical equipment);
– assemblies intended to be installed and used in market squares, marinas, campsites and other similar outdoor public sites;
– assemblies intended for charging stations for electric vehicles (AEVCS) for Mode 3 and Mode 4. They are designed to integrate the functionality and additional requirements for electric vehicle conductive charging systems according to IEC 61851-1:2017.
This first edition cancels and replaces the relevant technical specification published in 2014. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous technical specification:
    a new classification of the stationary ASSEMBLIES in accordance with their mechanical resistance (5.702);
    a new Table 702 with the list of tests and relevant severities to which the ASSEMBLIES have to be subjected according to the classification mentioned at point a);
    a new Annex (CC) with a new endurance test for the individual switching devices intended to be used in AEVSC, if they have not already been tested against this requirement;
    a general editorial review and a technical revision.
The contents of the corrigendum of August 2019 have been included in this copy.

This part of IEC 62271 is applicable to three-pole alternating current switches for rated
voltages higher than 52 kV, having making and breaking current ratings, for indoor and
outdoor installations, and for rated frequencies up to and including 60 Hz.
This document is also applicable to the operating devices of these switches and to their
auxiliary equipment.
NOTE 1 Switches for gas insulated switchgear are covered by this document.
NOTE 2 Switches having a disconnecting function and called switch-disconnectors are also covered by
IEC 62271-102.
NOTE 3 Earthing switches are not covered by this document. Earthing switches forming an integral part of a
switch are covered by IEC 62271-102.
The main object of this document is to establish requirements for switches used in
transmission and distribution systems. General purpose switches for this application are
designed to comply with the following service applications:
– carrying rated continuous current;
– carrying short-circuit currents for a specified time;
– switching of mainly active loads;
– switching of no-load transformers;
– switching of the charging current of unloaded cables, overhead lines or busbars;
– switching of closed-loop circuits;
– making short-circuit currents.
A further object of this document is to establish requirements for limited purpose and special
purpose switches used in transmission and distribution systems.
Limited purpose switches comply with one or more of the service applications indicated above.
Special purpose switches may comply with one or more of the service applications indicated
above and, in addition, are suitable for one or more of the following applications:
– switching single capacitor banks;
– switching back-to-back capacitor banks;
– switching shunt reactors including secondary or tertiary reactors switched from the primary
side of the transformer;
– applications requiring an increased number of operating cycles;
– switching under earth fault conditions in non-effectively earthed neutral systems.

This part of EN 62271 applies to high-voltage alternating current disconnecting circuit-breakers for operation at frequencies of 50 Hz and 60 Hz on systems having voltages of 72,5 kV and above. This standard identifies which requirements of EN 60694, EN 62271-100 and EN 62271-102 standards are applicable. It also gives the additional requirements specific to these devices. This standard covers a circuit-breaker which, when in the open position, satisfies the requirements of both a circuit-breaker and a disconnector.

The purpose of this document is to define homogeneous categories for the electromagnetic environments in order to harmonize as far as practicable all general rules and product standard requirements of electromagnetic compatibility (EMC), applicable to low-voltage switchgear, controlgear and their assemblies with built-in electronic circuits.

This document provides information, and recommended minimum requirements related to embedded software supporting the main functions of switchgear and controlgear during the whole lifecycle of the equipment. It includes also the parameterization aspects and basics about secure coding standards.

TAN - // IEC Corrigendum

TAN - // IEC Corrigendum

EN-IEC 60947-5-2 applies to inductive and capacitive proximity switches that sense the presence of metallic and/or non-metallic objects, ultrasonic proximity switches that sense the presence of sound reflecting objects, photoelectric proximity switches that sense the presence of objects and non-mechanical magnetic proximity switches that sense the presence of objects with a magnetic field. Products covered by the scope of this document are not subjected to defined behaviours under fault conditions. Proximity switches with defined behaviour are covered by IEC 60947-5-3 and have to fulfil additional requirements. These proximity switches are self-contained, have semiconductor switching element(s) and are intended to be connected to circuits, the rated voltage of which does not exceed 250 V 50 Hz/60 Hz AC RMS or 300 V DC. Examples of typical applications for in-scope products: - factory automation and machinery industry; - logistic and packaging industry; - conveyor belts, lifts; - process industry; - power plants. Special applications (e.g. corrosive atmosphere) can cause additional requirements. This document is not intended to cover proximity switches with analogue outputs. The object of this document is to state for proximity switches: - definitions; - classification; - characteristics; - product information; - normal service, mounting and transport conditions; - constructional and performance requirements; - tests to verify rated characteristics. Products covered by the scope of this document are expected to be selected, installed, and maintained by skilled personnel only.

2020-11-24: EC formal rejection for citation under EMCD
2019-11-13: D164/C065: BT approved the Annex ZA and Annexes ZZ for LVD and EMC and asked CCMC to make the standard available without further delay with the inclusion of the approves Annexes.

IEC 62026-3:2014 specifies an interface system between single or multiple controllers, and control circuit devices or switching elements. The interface system uses two conductor pairs within one cable - one of these pairs provides a differential communication medium and the other pair provides power to the devices. This part establishes requirements for the interoperability of components with such interfaces. This third edition of IEC 62026-3 cancels and replaces the second edition published in 2008. This third edition constitutes a technical revision. The main changes with respect to the previous edition are the followings:
- specification of group 4 messages (5.1.2);
- clarifications on messaging protocol (5.2);
- addition of I/O multicast poll messages (5.5.2 and 5.5.8);
- clarifications on slave behaviour (5.5.4 and 5.5.9);
- clarifications on physical layer (transceiver) in 5.7;
- miscellaneous corrections/clarifications on cable (8.2);
- clarifications on EMC testing (9.2.10) and logical testing (9.3).

2018-06-07: assessment requested on CD - HAS consultant comments to be addressed before CDV

This document specifies requirements for internal arc classification of metal-enclosed pole-mounted switchgear installations used for alternating current with rated voltages above 1 kV and up to and including 52 kV with service frequencies up to and including 60 Hz. This document is applicable to three-phase, two-phase and single phase equipment. Enclosures may include fixed and removable components and may be filled with fluid (liquid or gas) to provide insulation. NOTE For the use of this document high-voltage (IEC 60050-601:1985, 601-01-27) is the rated voltage above 1 000 V. However, medium voltage (IEC 60050-601:1985, 601-01-28) is commonly used for distribution systems with voltages above 1 kV and generally applied up to and including 52 kV; refer to [1] of the Bibliography. This document does not preclude that other equipment may be included in the same enclosure. In such a case, any possible influence of that equipment on the switchgear and controlgear is to be taken into account.

2019-04-16: Formal Vote assessment documents (ZA, RA) sent to Production on 2019-04-16 by the TC and revised Annex ZZ sent to Production on 2019-04-18. Consider the possibility to go to BT to validate the Annex ZZ, since not included in the Formal Vote documentation. Furthermore, Consultant suggests modifications to the foreword. Check with PM before publication.
2019-03-20: Annex ZZ not included in the FV documents. Check with PM before requesting Formal Vote assessment.
2018-12-07: positive LVD assessment at ENQ. The updated Annex ZZ which received a positive assessment has not been included in the public Enquiry. It will have to be included for FV.

This part of IEC 62026 applies to interfaces between low-voltage switchgear, controlgear, and
controllers (e.g. programmable controllers, personal computers, etc.).
This document does not apply to higher level industrial communication networks that have
become known as fieldbuses and are considered by IEC subcommittee 65C.
The purpose of this document is to harmonize and define rules, components and requirements
of a general nature applicable to industrial CDIs. Those features of the various CDI standards
which can be considered as general have therefore been brought together in this document.
For each CDI, two main documents are necessary to determine all requirements and tests:
a) this document, referred to as “IEC 62026-1” in the relevant CDI parts covering the various
types of CDIs;
b) the specific CDI part of the IEC 62026 series.
A specific CDI part may omit a general requirement if it is not applicable, or it may add to it if
it is inadequate in the particular case.
NOTE Product-specific requirements for products incorporating a CDI are given in the relevant product standards.
These requirements apply in addition to those given in this document.

This Part of IEC 62271, which is a Technical Report, refers to prefabricated metal-enclosed and solid-insulation enclosed (both hereinafter called enclosed) switchgear and controlgear assemblies for alternating current of rated voltages above 1 kV and up to and including 52 kV as specified in IEC 62271-200 and IEC 62271-201, and to other equipment included in the same enclosure with any possible mutual influence.
This Technical Report may be used for the extension of the validity of type tests performed on one test object with a defined set of ratings to another switchgear assembly of the same family with a different set of ratings or different arrangements of components. It supports the selection of representative test objects composed of functional units of a family of switchgear and controlgear aimed at the optimization of type tests in order to perform a consistent conformity assessment.
This Technical Report utilises a combination of sound technical and physical principles, manufacturer and user experience and calculations to establish guidance for the extension of validity of type tests, covering various design and rating aspects.

This part of IEC 62271 applies to three-pole-operated fused circuit-switchers designed with
rated voltages above 1 kV up to and including 52 kV for use on three-phase alternating
current systems of either 50 Hz or 60 Hz.
They can be designed either as stand-alone devices, or be embedded in a switchgear and
controlgear assembly.
They are intended to be used for circuits or applications requiring only a normal mechanical
and electrical endurance capability. Such applications cover protection of HV/LV transformers
for instance, but exclude distribution lines or cables, as well as motor circuits and capacitor
bank circuits.
Short-circuit conditions with low currents, up to the fused circuit-switcher rated take-over
current, are dealt with by supplementary devices (strikers, relays, etc.), properly arranged,
tripping the circuit-switcher. Current-limiting fuses are incorporated in order to ensure that the
short-circuit breaking capacity of the device is above that of the circuit-switcher alone.
NOTE 1 In this document, the term "fuse" is used to designate either the fuse or the fuse-link where the general
meaning of the text does not result in ambiguity.
NOTE 2 Other circuit-switchers exist; see reference [4].
Devices that require a dependent manual operation are not covered by this document.

This publication applies to certain position switches with automatic return actuator for industrial use, giving the standardized dimensions of which and the characteristics necessary for their application.

This publication applies to certain position switches with automatic return actuator for industrial use, giving the standardized dimensions of which and the characteristics necessary for their application.

This part of IEC 60794 presents the detailed requirements specific to this type of cable to
ensure compatibility with the series of International Standards ISO/IEC 11801, Information
technology – Generic cabling for customer premises (Parts 1 to 6).
The requirements of family specification IEC 60794-2-20 are applicable to cables covered by
this document.
Particular requirements detailed in Clause 4 define either a specific option in relation to the
requirements of IEC 60794-2-20 or additional requirements.

This part of IEC 60947 covers low-voltage arc quenching devices, hereinafter referred to as
AQDs, which are intended to eliminate arc-faults in low-voltage assemblies (typically lowvoltage
switchgear and controlgear assemblies in accordance with the IEC 61439 series), by
creating a lower impedance current path, to cause the arcing current to transfer to the new
current path. This new current path is maintained until a short-circuit protection device (SCPD)
interrupts the short-circuit current.
AQDs are installed in low-voltage assemblies, connected to the main circuit, preferably as
close as possible to all primary power sources.
Their rated voltage does not exceed 1 000 V AC or 1 500 V DC.
This document does not cover:
• sensors intended to detect arc-faults;
• devices intended to trigger the functioning of the arc quenching device;
• devices intended to interrupt arc-fault current;
• special requirements for AQDs for use in explosive atmospheres (e.g. ATEX).

IEC 61439-3:2012 defines the specific requirements for distribution boards intended to be operated by ordinary persons (DBO). DBOs have the following criteria:  - intended to be operated by ordinary persons (e.g. switching operations and replacing fuse-links), e.g. in domestic (household) applications;  - outgoing circuits contain protective devices, intended to be operated by ordinary persons, complying e.g. with IEC 60898-1, IEC 61008, IEC 61009, IEC 62423 and IEC 60269-3;   - rated voltage to earth does not exceed 300 V a.c.;  - rated current (I_nc) of the outgoing circuits does not exceed 125 A and the rated current (I_nA) of the DBO does not exceed 250 A;  - intended for the distribution of electrical energy;  - enclosed, stationary;  - for indoor or outdoor use.   This first edition cancels and replaces the first edition of IEC 60439-3 (1990), Amendment 1 (1993) and Amendment 2 (2001). It constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 60439-3 (including the amendments):  - alignment with IEC 61439-1:2011.   This publication is to be read in conjunction with IEC 61439-1:2011.

This part of IEC 62271 covers the connection assembly of fluid-filled and extruded cables to
gas-insulated metal enclosed switchgear (GIS), in single- or three-phase arrangements where
the cable terminations are fluid-filled or dry-type and there is a separating insulating barrier
between the cable insulation and the gas insulation of the switchgear.
The purpose of this document is to establish electrical and mechanical interchangeability
between cable terminations and the gas-insulated metal-enclosed switchgear and to
determine the limits of supply. It complements and amends, if applicable, the relevant IEC
standards. For the purpose of this document the term "switchgear" is used for "gas-insulated
metal enclosed switchgear".
It does not cover directly immersed cable terminations, as described in CIGRE
brochure 89 [4] 1.

This part of IEC 60947 is applicable to the following equipment:
– electromechanical contactors and starters including motor protective switching device
(MPSD);
– actuators of contactor relays;
– contacts dedicated exclusively to the coil circuit of this contactor or this contactor relay;
– dedicated accessories (e.g. dedicated wiring, dedicated latch accessory);
intended to be connected to distribution circuits, motors circuits and other load circuits, the
rated voltage of which does not exceed 1 000 V AC or 1 500 V DC.
This document covers also the assessment procedure for electromechanical overload
protection used in safety applications such as protecting a motor located in explosive
atmosphere from the outside atmosphere: See Annex L.
This document does not apply to:
– starters for DC motors 1;
NOTE 1 The requirements for DC motor starters are under consideration for the next maintenance cycle.
– auxiliary contacts of contactors and contacts of contactor relays. These are covered by
IEC 60947-5-1;
– starter used downstream to frequency drive1;
NOTE 2 Additional requirements for starter used downstream to frequency drive are under consideration for
the next maintenance cycle.
– short-circuit protective device integrated within starters other than MPSDs. This is covered
by IEC 60947-2 and IEC 60947-3;
– the use of the product with additional measure within explosive atmospheres. These are
given in IEC 60079 series;
– embedded software design rules1;
– cyber security aspects. These are covered by IEC 62443 series.
The objective of this document is to state:
a) the characteristics of the equipment;
b) the conditions applicable to the equipment with reference to:
1) its operation and behaviour,
2) its dielectric properties,
3) its degree of protection,
4) its construction including safety measures against electric shock, fire hazard and
mechanical hazard;
c) the tests intended for confirming that these conditions have been met, and the methods to
be adopted for these tests;
d) the information to be given with the equipment or in the manufacturer's literature.

This part of IEC 60947-7 specifies requirements for PCB terminal blocks primarily intended for
industrial or similar use.
Mounting and fixing on the printed circuit board is made by soldering, press-in or equivalent
methods to provide electrical and mechanical connection between copper conductors and the
printed circuit board.
This document applies to PCB terminal blocks intended to connect copper conductors, with or
without special preparation, having a cross-section between 0,08 mm2 and 300 mm2
(AWG 28-600 kcmil), intended to be used in circuits of a rated voltage not exceeding
1 000 V AC up to 1 000 Hz or 1 500 V DC.
NOTE 1 Large-cross-section terminal blocks are dedicated to the specific design of high-current PCBs. The range
up to 300 mm2 is kept to cover any possible application. Examples of high current PCBs and PCB terminal blocks
are shown in Annex C.
NOTE 2 AWG is the abbreviation of “American Wire Gage” (Gage (US) = Gauge (UK)).
1 kcmil = 1 000 cmil;
1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil;
1 mil = 1/1 000 inch.
This document can be used as a guide for special types of PCB terminal blocks with
components, such as disconnect units, integrated cartridge fuse-links and the like or with
other dimensions of conductors.
If applicable, in this document the term “clamping unit” is used instead of “terminal”. This is
taken into account in the case of references to IEC 60947-1.

This European Standard applies to welded wrought steel enclosures pressurised with dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases, used in indoor and outdoor installations of high-voltage switchgear and controlgear with rated voltages above 1kV, where the gas is used principally for its dielectric and/or arc-quenching properties with rated voltages.
-   above 1 kV and up to and including 52 kV and with gas-filled compartments with design pressure higher than 300 kPa relative pressure (gauge);
-   and with rated voltage above 52 kV.
The enclosures comprise parts of electrical equipment not necessarily limited to the following examples:
-   circuit-breakers;
-   switch-disconnectors;
-   disconnectors;
-   earthing switches;
-   current transformers;
-   voltage transformers;
-   surge arrestors;
-   busbars and connections;
-   etc.
The scope also covers enclosures of pressurized components such as the centre chamber of live tank switchgear, gas-insulated current transformers, etc.

This European Standard applies to welded wrought aluminium and aluminium alloy enclosures pressurized with dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases, used in indoor and outdoor installations of high-voltage switchgear and controlgear with rated voltages above 1kV, where the gas is used principally for its dielectric and/or arc-quenching properties with rated voltages.
-   above 1 kV and up to and including 52 kV and with gas-filled compartments with design pressure higher than 300 kPa relative pressure (gauge);
-   and with rated voltage above 52 kV.
The enclosures comprise parts of electrical equipment not necessarily limited to the following examples:   
-   circuit-breakers;
-   switch-disconnectors;
-   disconnectors;
-   earthing switches;
-   current transformers;
-   voltage transformers;
-   surge arrestors;
-   busbars and connections;
-   etc.
The scope also covers enclosures of pressurized components such as the centre chamber of live tank switchgear, gas-insulated current transformers, etc.

This European Standard applies to welded composite enclosures of cast and wrought aluminium alloy pressurized with dry air, inert gases (e.g. sulphur hexafluoride or nitrogen or a mixture of such gases), used in indoor and outdoor installations of high-voltage switchgear and controlgear with rated voltages above 1kV, where the gas is used principally for its dielectric and/or arc-quenching properties with rated voltages
-   above 1 kV and up to and including 52 kV and with gas-filled compartments with design pressure higher than 300 kPa relative pressure (gauge);
-   and with rated voltage above 52 kV.
The enclosures comprise parts of electrical equipment not necessarily limited to the following examples:
-   circuit-breakers;
-   switch-disconnectors;
-   disconnectors;
-   earthing switches;
-   current transformers;
-   voltage transformers;
-   surge arrestors;
-   busbars and connections;
-   etc.
The scope also covers enclosures of pressurized components such as the centre chamber of live tank switchgear, gas-insulated current transformers, etc.

This part of IEC 62271 applies to alternating current disconnectors and earthing switches,
designed for indoor and outdoor installations for nominal voltages above 1 000 V and for
service frequencies up to and including 60 Hz.
It also applies to the operating devices of these disconnectors and earthing switches and their
auxiliary equipment.
Additional requirements for disconnectors and earthing switches in enclosed switchgear and
controlgear are given in IEC 62271-200, IEC 62271-201 and IEC 62271-203.
NOTE Disconnectors in which the fuse forms an integral part are not covered by this standard.
This document is also applicable to switching devices having disconnecting and/or earthing
functionalities apart from other functions, such as high-speed earthing switch, circuit-breaker
and switch-disconnector.

IEC corrected version

The contents of the corrigendum of January 2018 have been included in this copy.

IEC corrigendum

This part of IEC 62271 is applicable to AC switching devices designed for indoor or outdoor
installation, for operation at frequencies of 50 Hz and 60 Hz on systems having voltages
above 1 000 V and applied for inductive current switching. It is applicable to switching devices
(including circuit-breakers in accordance with IEC 62271-100) that are used to switch
high-voltage motor currents and shunt reactor currents and also to high-voltage contactors
used to switch high-voltage motor currents as covered by IEC 62271-106.
Switching unloaded transformers, i.e. breaking transformer magnetizing current, is not
considered in this document. The reasons for this are as follows:
a) Owing to the non-linearity of the transformer core, it is not possible to correctly model the
switching of transformer magnetizing current using linear components in a test laboratory.
Tests conducted using an available transformer, such as a test transformer, will only be
valid for the transformer tested and cannot be representative for other transformers.
b) As detailed in IEC TR 62271-306, the characteristics of this duty are usually less severe
than any other inductive current switching duty. Such a duty may produce severe
overvoltages within the transformer winding(s) depending on the re-ignition behaviour of
the switching device and transformer winding resonance frequencies.
NOTE 1 The switching of tertiary reactors from the high-voltage side of the transformer is not covered by this
document.
NOTE 2 The switching of shunt reactors earthed through neutral reactors is not covered by this document.
However, the application of test results according to this document, on the switching of neutral reactor earthed
reactors (4-leg reactor scheme), is discussed in IEC TR 62271-306.

This part of IEC 60947 applies to control circuit devices and switching elements intended for
controlling, signalling, interlocking, etc., of switchgear and controlgear.
It applies to control circuit devices having a rated voltage not exceeding 1 000 V a.c. (at a
frequency not exceeding 1 000 Hz) or 600 V d.c.
However, for operational voltages below 100 V a.c. or d.c., see 4.3.2.2.
This standard applies to specific types of control circuit devices such as:
• manual control switches, for example push-buttons, rotary switches, foot switches, etc.;
• electromagnetically operated control switches, either time-delayed or instantaneous, for
example contactor relays;
• pilot switches, for example pressure switches, temperature sensitive switches
(thermostats), programmers, etc.;
• position switches, for example control switches operated by part of a machine or
mechanism;
• associated control circuit equipment, for example indicator lights, etc.
NOTE 1 A control circuit device includes (a) control switch(es) and associated devices such as (an) indicator
light(s).
NOTE 2 A control switch includes (a) switching element(s) and an actuating system.
NOTE 3 A switching element can be a contact element or a semiconductor element.
It also applies to specific types of switching elements associated with other devices (whose
main circuits are covered by other standards) such as:
• auxiliary contacts of a switching device (e.g. contactor, circuit breaker. etc.) which are not
dedicated exclusively for use with the coil of that device;
• interlocking contacts of enclosure doors;
• control circuit contacts of rotary switches;
• control circuit contacts of overload relays.
Contactor relays also comply with the requirements and tests of IEC 60947-4-1 except for the
utilization category which comply with this standard.
This standard does not include the relays covered in IEC 60255 or in the IEC 61810 series,
nor automatic electrical control devices for household and similar purposes.
The colour requirements of indicator lights, push-buttons, etc., are found in IEC 60073 and
also in CIE S 0004/E-2001 from the Commission of Illumination (CIE).

This document specifies dimensional and functional requirements for the compatible mounting
of switchgear, controlgear and accessories on some types of rails.
The object of this document is to specify those dimensions that are critical for the correct
design of mounting rails and equipment.
The following sections are covered by this document:
– "top hat" section;
– "C" section;
– "G" section.
NOTE 1 Mounting compatibility does not imply functional interchangeability.
Annexes deal with specific steel mounting rails satisfying the requirements of this document,
and give additional dimensional data and loading requirements applicable to such rails.
NOTE 2 The detailed design and material of specific steel rails is given in the annexes.
NOTE 3 Other shapes of rails complying with this document not listed in Annex A can be used.
Mounting rails used as a protective conductor using a conducting connection to a protective
conductor terminal block are specified in IEC 60947-7-2. In other applications where the
mounting rail is used as earthing conductor, the relevant product standard applies.
This document has the status of a horizontal standard in accordance with
IEC Guide 108:2006.
This horizontal standard is primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
horizontal standards in the preparation of its publications. The contents of this horizontal
standard will not apply unless specifically referred to or included in the relevant publications.
2 Normative

This part of IEC 62271 applies to AC switchgear and controlgear designed for indoor and/or
outdoor installation and for operation at service frequencies up to and including 60 Hz and
having rated voltages above 1 000 V.
This document applies to all high-voltage switchgear and controlgear except as otherwise
specified in the relevant IEC standards for the particular type of switchgear and controlgear.
NOTE For the use of this document, high-voltage is defined as the rated voltage above 1 000 V. However, the
term medium voltage is commonly used for distribution systems with voltages above 1 kV and generally applied up
to and including 52 kV.

intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or
1 500 V d.c.; it also contains additional requirements for integrally fused circuit-breakers.
Circuit-breakers rated above 1 000 V a.c. but not exceeding 1 500 V a.c. may also be tested to
this standard.
It applies whatever the rated currents, the method of construction or the proposed applications
of the circuit-breakers may be.
The requirements for circuit-breakers which are also intended to provide earth leakage
protection are contained in Annex B.
The additional requirements for circuit-breakers with electronic over-current protection are
contained in Annex F.
The additional requirements for circuit-breakers for IT systems are contained in Annex H.
The requirements and test methods for electromagnetic compatibility of circuit-breakers are
contained in Annex J.
The requirements for circuit-breakers not fulfilling the requirements for over-current protection
are contained in Annex L.
The requirements for modular residual current devices (without integral current breaking
device) are contained in Annex M.
The requirements and test methods for electromagnetic compatibility of circuit-breaker
auxiliaries are contained in Annex N.
The requirements and test methods for d.c. circuit-breakers for use in photovoltaic (PV)
applications are contained in Annex P.
The requirements and test methods for circuit-breakers incorporating residual current
protection with automatic reclosing functions are contained in Annex R.
Supplementary requirements for circuit-breakers used as direct-on-line starters are given in
IEC 60947-4-1, applicable to low-voltage contactors and starters.
The requirements for circuit-breakers for the protection of wiring installations in buildings and
similar applications, and designed for use by uninstructed persons, are contained in
IEC 60898.
The requirements for circuit-breakers for equipment (for example electrical appliances) are
contained in IEC 60934.
For certain specific applications (for example traction, rolling mills, marine service) particular or
additional requirements may be necessary.
NOTE Circuit-breakers which are dealt with in this standard can be provided with devices for automatic opening
under predetermined conditions other than those of over-current and undervoltage as, for example, reversal of
power or current. This standard does not deal with the verification of operation under such pre-determined
conditions.
The object of this standard is to state:
a) the characteristics of circuit-breakers;
b) the conditions with which circuit-breakers shall comply with reference to:
1) operation and behaviour in normal service;
2) operation and behaviour in case of overload and operation and behaviour in case of
short-circuit, including co-ordination in service (selectivity and back-up protection);
3) dielectric properties;
c) tests intended for confirming that these conditions have been met and the methods to be
adopted for these tests;
d) information to be marked on or given with the apparatus.

This document establishes the reference dictionary of the general description of low-voltage
switchgear and controlgear classes based on defined properties.
This dictionary is used to facilitate the exchange in electronic format of data describing lowvoltage
switchgear and controlgear.
This document provides clear and unambiguous definitions of a limited number of properties
and classes which are mainly used for presentation, selection and identification of products
particularly in electronic catalogues.
Each property has an unambiguously defined meaning and naming, and, where relevant, a
defined value list, a defined format and a defined unit.
The intention is not to cover manufacturer-specific features.

The contents of the corrigendum 1 of January 2018 have been included in this copy.

2017-05-02: D156/C084 - Ratified standards not being made available.
DOP = DAV + 6 months
DOW = DAV + 36 months
Annex ZZ for MD 2006/42/EC available in EN 60947-5-5:1997/A11.

This part of IEC 62271 specifies the service conditions, rated characteristics, general
structural requirements and test methods of the assemblies of the main electrical functional
units of a high-voltage/low-voltage distribution substation, duly interconnected, for alternating
current of rated operating voltages above 1 kV and up to and including 52 kV on the highvoltage
side, service frequency 50 Hz or 60 Hz. This assembly is to be cable-connected to the
network, and intended for installation within an indoor or outdoor closed electrical operating
area.
A Compact Equipment Assembly for Distribution Substation (CEADS) as defined in this
document is designed and tested to be a single product with a single serial number and one
set of documentation.
The functions of a CEADS are:
• switching and control for the operation of the high-voltage circuit(s);
• protection of the high-voltage/low-voltage transformer functional unit;
• high-voltage/low-voltage transformation;
• switching and control for the operation and protection of the low-voltage feeders.
However relevant provisions of this document are also applicable to designs where not all of
these functions exist (e.g. equipment comprising only high-voltage/low-voltage transformation
and switching and control for the operation and protection of the low-voltage feeder functions
or equipment without switching and control for the operation of the high-voltage circuit(s)).
NOTE For the purpose of this document a self-protected transformer is considered not as a CEADS, but as a
functional unit, designed and type tested to its own product standard IEC 60076-13:2006.

This standard applies to cast aluminium alloy enclosures pressurized with dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases, used in indoor or outdoor installations of high-voltage switchgear and controlgear above 1 kV, where the gas is used principally for its dielectric and/or arc-quenching properties with rated voltages
-   above 1 kV and up to and including 52 kV and with gas-filled compartments with design pressure higher than 300 kPa relative pressure (gauge);
-   and with rated voltage above 52 kV.
The enclosures comprise parts of electrical equipment not necessarily limited to the following examples:
-   Circuit-breakers;
-   Switch-disconnectors;
-   Disconnectors;
-   Earthing switches;
-   Current transformers;
-   Voltage transformers;
-   Surge arrestors;
-   Busbars and connections;
-   etc.
The scope also covers enclosures of pressurized components such as the centre chamber of live tank switchgear, gas-insulated current transformers, etc.