High-voltage switchgear and controlgear - Part 106: Alternating current contactors, contactor-based controllers and motor-starters

IEC 62271-106:2021 applies to AC contactors and/or contactor-based controllers and motor-starters 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.
This second edition cancels and replaces the first edition published in 2011. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
document numbered to correspond to IEC 62271-1 2017.

General Information

Status
Published
Publication Date
25-Apr-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
26-Apr-2021
Ref Project

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IEC 62271-106
Edition 2.0 2021-04
INTERNATIONAL
STANDARD
High-voltage switchgear and controlgear –
Part 106: Alternating current contactors, contactor-based controllers and motor-
starters
IEC 62271-106:2021-04(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 62271-106
Edition 2.0 2021-04
INTERNATIONAL
STANDARD
High-voltage switchgear and controlgear –
Part 106: Alternating current contactors, contactor-based controllers and motor-
starters
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10 ISBN 978-2-8322-9635-6

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62271-106:2021  IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Normal and special service conditions ........................................................................... 23

5 Ratings .......................................................................................................................... 24

6 Design and construction ................................................................................................ 38

7 Type tests ..................................................................................................................... 42

8 Routine tests ................................................................................................................. 70

9 Guide to the selection of contactors and motor-starters for service (informative) ........... 72

10 Information to be given with enquiries, tenders and orders (informative) ........................ 76

11 Transport, storage, installation, operating instructions and maintenance........................ 78

12 Safety ............................................................................................................................ 78

13 Influence of the product on the environment .................................................................. 78

Annex A (normative) Identification of test objects ................................................................. 79

Annex B (informative) Determination of the equivalent RMS value of a short-time

current during a short-circuit of a given duration ................................................................... 80

Annex C (normative) Method for weatherproofing test for outdoor switchgear and

controlgear ........................................................................................................................... 81

Annex D (informative) References for auxiliary and control circuit components .................... 82

Annex E (normative) Tolerances on test quantities during tests ........................................... 83

Annex F (informative) Information and technical requirements to be given with

enquires, tenders and orders ................................................................................................ 88

Annex G (informative) List of symbols and abbreviations ..................................................... 89

Annex H (informative) Electromagnetic compatibility on site ................................................ 90

Annex I (informative) List of notes concerning certain countries ........................................... 91

Annex J (informative) Extension of validity type tests ........................................................... 92

Annex K (informative) Exposure to pollution ......................................................................... 93

Annex AA (normative) Records and reports of type tests for making, breaking and

short-time current performance ............................................................................................. 94

Annex BB (normative) Disconnectors and earthing switches used in controllers ................... 98

Bibliography ........................................................................................................................ 100

Figure 1 – Examples of speed/time curves ............................................................................ 32

Figure 2 – Representation by two parameters of a prospective TRV of a circuit .................... 60

Figure 3 – Representation of the specified TRV by a two-parameter reference line and

a delay line ........................................................................................................................... 60

Figure 4 – Determination of power-frequency recovery voltage ............................................. 61

Figure 5 – Test duties A and B – preferred earth point .......................................................... 63

Figure 6 – Test duties A and B – alternative earth point ........................................................ 64

Figure 7 – Test duty C – preferred earth point ....................................................................... 64

Figure 8 – Test duty C – alternative earth point ..................................................................... 65

Figure 9 – Characteristics for determining take-over current ................................................. 66

---------------------- Page: 4 ----------------------
IEC 62271-106:2021  IEC 2021 – 3 –

Figure BB.1 – Disconnector and earthing switch locations .................................................... 98

Table 1 – Ratings and characteristics ................................................................................... 25

Table 2 – Utilization categories ............................................................................................. 31

Table 3 – Characteristics dependent on starter type ............................................................. 37

Table 4 – Applicable type tests ............................................................................................. 44

Table 5 – Intermittent duty operating cycles .......................................................................... 48

Table 6 – Verification of rated making and breaking capacities – Conditions for making

and breaking corresponding to the several utilization categories at rated voltage U ............. 52

Table 7 – Relationship between current broken I and OFF time .......................................... 55

Table 8 – Overload current withstand requirements .............................................................. 56

Table 9 – Transient recovery voltage characteristics ............................................................. 63

Table 10 – Verification of the number of on-load operating cycles – Conditions for

making and breaking corresponding to the several utilization categories ............................... 68

Table E.101 – Tolerances on test quantities for type test ...................................................... 83

Table G.101 – Additional list of symbols and abbreviations ................................................... 89

---------------------- Page: 5 ----------------------
– 4 – IEC 62271-106:2021  IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 106: Alternating current contactors,
contactor-based controllers and motor-starters
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) 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 62271-106 has been prepared by subcommittee 17A: Switching

devices, of IEC technical committee 17: High-voltage switchgear and controlgear.

This second edition cancels and replaces the first edition published in 2011. It constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
• document numbered to correspond to IEC 62271-1 2017.
---------------------- Page: 6 ----------------------
IEC 62271-106:2021  IEC 2021 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
17A/1296/FDIS 17A/1301/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This standard is to be read in conjunction with IEC 62271-1:2017. In order to simplify the

indication of corresponding requirements, the same numbering of clauses and subclauses is

used as in IEC 62271-1. Modifications to these clauses and subclauses are given under the

same numbering, whilst additional subclauses are numbered from 101.

A list of all parts of the IEC 62271 series under the general title, High-voltage switchgear and

controlgear, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 62271-106:2021  IEC 2021
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 106: Alternating current contactors,
contactor-based controllers and motor-starters
1 Scope

This part of IEC 62271 applies to AC contactors and/or contactor-based controllers and motor-

starters 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;
---------------------- Page: 8 ----------------------
IEC 62271-106:2021  IEC 2021 – 7 –
– 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.

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 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test

requirements
IEC 60068-2-1:2007, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat

IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic

(12 h + 12 h cycle)

IEC 60076-2, Power transformers – Part 2: Temperature rise for liquid-immersed transformers

IEC 60076-11:2018, Power transformers – Part 11: Dry-type transformers
---------------------- Page: 9 ----------------------
– 8 – IEC 62271-106:2021  IEC 2021

IEC 60255-21-1:1988, Electrical relays – Part 21: Vibration, shock, bump and seismic tests on

measuring relays and protection equipment – Section One: Vibration tests (sinusoidal)

IEC 60282-1, High-voltage fuses – Part 1: Current-limiting fuses

IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-

symbols.info/equipment)

IEC 60644, Specification for high-voltage fuse-links for motor circuit applications

IEC 60947-5-1, Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and

switching elements – Electromechanical control circuit devices

IEC 61000-4-18:2019, Electromagnetic compatibility (EMC) – Part 4-18: Testing and

measurement techniques – Damped oscillatory wave immunity test

IEC 61230, Live working – Portable equipment for earthing or earthing and short-circuiting

IEC 61812-1, Time relays for industrial use and residential use – Part 1: Requirements and

tests

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear

IEC 62271-100:2021, High-voltage switchgear and controlgear – Part 100: Alternating current

circuit-breakers

IEC 62271-102:2018, High-voltage switchgear and controlgear – Part 102: Alternating current

disconnectors and earthing switches

IEC 62271-110:2017, High-voltage switchgear and controlgear – Part 110: Inductive load

switching

IEC 62271-200:2021, High-voltage switchgear and controlgear – Part 200: AC metal-enclosed

switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

3 Terms and definitions

For the purposes of this document, the terms and definitions given in Clause 3 of

IEC 62271-1:2017, as well as the following, apply.
3.1 General terms and definitions
Subclause 3.1 of IEC 62271-1: 2017 applies with the following additions:
3.1.101
controlgear

general term covering switching devices and their combination with associated control,

measuring, protective and regulating equipment, also assemblies of such devices and

equipment with associated interconnections, accessories, enclosures and supporting

structures, intended in principle for the control of electric energy consuming equipment

[SOURCE: IEC 60050-441:2000, 441-11-03]
---------------------- Page: 10 ----------------------
IEC 62271-106:2021  IEC 2021 – 9 –
3.1.102
overcurrent
current exceeding the rated current
[SOURCE: IEC 60050-441:2000, 441-11-06]
3.1.103
short-circuit current

over-current resulting from a short circuit due to a fault or an incorrect connection in an electric

circuit
[SOURCE: IEC 60050-441:2000, 441-11-07]
3.1.104
overload

operating conditions in an electrically undamaged circuit, which cause an over-current

[SOURCE: IEC 60050-441:2000, 441-11-08]
3.1.105
conductive part

part which is capable of conducting current although it may not necessarily be used for carrying

service current
[SOURCE: IEC 60050-441:2000, 441-11-09]
3.1.106
ambient air temperature

temperature, determined under prescribed conditions, of the air surrounding the complete

switching device or fuse

Note 1 to entry: For switching devices or fuses installed inside an enclosure, it is the temperature of the air outside

the enclosure.
[SOURCE: IEC 60050-441:2000, 441-11-13]
3.2 Assemblies of switchgear and controlgear
Subclause 3.2 of IEC 62271-1: 2017 applies.
3.3 Parts of assemblies
Subclause 3.3 of IEC 62271-1: 2017 applies.
3.4 Switching devices
Subclause 3.4 of IEC 62271-1: 2017 applies with the following modifications.
3.4.101
switching device
device designed to make or break the current in one or more electric circuits
[SOURCE: IEC 60050-441:2000, 441-14-01]
---------------------- Page: 11 ----------------------
– 10 – IEC 62271-106:2021  IEC 2021
3.4.102
mechanical switching device

switching device (such as a contactor or a disconnector) designed to close and open one or

more electric circuits by means of separable contacts
[SOURCE: IEC 60050-441:2000, 441-14-02, modified: Note 1 to entry deleted.]
3.4.103
disconnector

mechanical switching device which provides, in the open position, an isolating distance in

accordance with specified requirements

Note 1 to entry: A disconnector is capable of opening and closing a circuit either when 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.

Note 2 to entry: A withdrawable contactor assembly may be used as a disconnector.

Note 3 to entry: In North America, this device is also called an isolating means or an isolating switch.

[SOURCE: IEC 60050-441:2000, 441-14-05, modified: Note 2 and 3 added.]
3.4.104
earthing switch

mechanical switching device for earthing parts of a circuit, capable of withstanding for a

specified time currents under abnormal conditions such as those of short circuit, but not

required to carry current under normal conditions of the circuit
Note 1 to entry: An earthing switch may have a short-circuit making capacity.
[SOURCE: IEC 60050-441:2000, 441-14-11]
3.4.105
contactor

mechanical switching device having only one position of rest, operated otherwise than by hand,

capable of making, carrying and breaking currents under normal circuit conditions including

operating overload conditions

Note 1 to entry: Contactors may be designated according to the method by which the force for closing the main

contacts is provided.
[SOURCE: IEC 60050-441:2000, 441-14-33]
3.4.106
electromagnetic contactor

contactor in which the force for closing or opening the main contacts is provided by an

electromagnet
3.4.107
vacuum contactor

contactor in which the main contacts open and close within a highly evacuated envelope

3.4.108
SF contactor

contactor in which the main contacts open and close within an SF gas-filled compartment

---------------------- Page: 12 ----------------------
IEC 62271-106:2021  IEC 2021 – 11 –
3.4.109
latched contactor

contactor, the moving elements of which are prevented by means of a latching arrangement

from returning to the position of rest when the operating means are de-energized

Note 1 to entry: The latching, and the release of the latching, may be mechanical, electromagnetic, pneumatic, etc.

[SOURCE: IEC 60050-441:2000, 441-14-34, modified: Note 2 to entry deleted.]
3.4.110
starter

combination of all the switching means necessary to start and stop a motor in combination with

suitable overload protection
[SOURCE: IEC 60050-441:2000, 441-14-38, modified: Note 1 to entry deleted.]
3.4.110.1
direct-on-line starter
starter which connects the line voltage across the motor terminals in one step
[SOURCE: IEC 60050-441:2000, 441-14-40]
3.4.110.2
reversing starter

starter intended to cause the motor to reverse the direction of rotation by reversing the motor

primary connections even when the motor is running
3.4.110.3
two-direction starter

starter intended to cause the motor to reverse the direction of rotation by reversing the motor

primary connections only when the motor is not running
3.4.110.4
reduced kVA starter
starter which reduces the starting kVA of the motor

Note 1 to entry: Reduced kVA starters may include auto-transformer, reactor, rheostatic starters.

3.4.110.5
auto-transformer starter
starter which uses one or more reduced voltages derived from an auto-transformer
3.4.110.6
rheostatic starter

starter utilizing one or several resistors for obtaining, during starting, stated motor torque

characteristics and for limiting the current

Note 1 to entry: A rheostatic starter generally consists of three basic parts, which may be supplied either as a

composite unit or as separate units to be connected at the place of utilization:

– the mechanical switching devices for supplying the stator (generally associated with an overload protective

device);
– the resistor(s) inserted in the rotor circuit;
– the mechanical switching devices for cutting out the resistor(s) successively.
[SOURCE: IEC 60050-441:2000, 441-14-42, modified: Note 1 to entry added.]
---------------------- Page: 13 ----------------------
– 12 – IEC 62271-106:2021  IEC 2021
3.4.110.7
rheostatic rotor starter

rheostatic starter for an asynchronous wound-rotor motor which, during the starting period, cuts

out successively one or several resistors previously provided in the rotor circuit

[SOURCE: IEC 60050-441:2000, 441-14-43]
3.4.110.8
reactor starter
primary reactor starter

starter that includes a reactor connected in series with the stator winding of an alternating

current motor to furnish reduced voltage for starting
3.4.110.9
electromagnetic starter

starter in which the force for closing the main contacts is provided by an electromagnet

3.4.110.10
n-step starter

starter in which there are (n – 1) intermediate accelerating positions between the off and full on

positions

Note 1 to entry: A starter in which there is no intermediate accelerating position between the OFF and ON positions

is a single step or direct-on-line starter (see 3.4.110.1).

Note 2 to entry: A starter in which there is only one intermediate accelerating position between the OFF and ON

positions is known as a two-step starter.
Note 3 to e
...

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