IEC 60947-6-2:2020

IEC 60947-6-2 ®
Edition 3.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 6-2: Multiple function equipment – Control and protective switching devices
(or equipment) (CPS)
Appareillage à basse tension –
Partie 6-2: Matériels à fonctions multiples – Appareils (ou matériel) de connexion
de commande de protection (ACP)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées
antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60947-6-2 ®
Edition 3.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –

Part 6-2: Multiple function equipment – Control and protective switching devices

(or equipment) (CPS)
Appareillage à basse tension –

Partie 6-2: Matériels à fonctions multiples – Appareils (ou matériel) de connexion

de commande de protection (ACP)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.40; 29.130.20 ISBN 978-2-8322-9161-0

– 2 – IEC 60947-6-2:2020  IEC 2020
CONTENTS
FOREWORD . 7
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
3.1 General . 11
3.2 Terms and definitions related to the equipment . 12
3.3 Terms and definitions concerning characteristic quantities . 13
3.4 Terms and definitions concerning safety aspects . 14
4 Classification . 15
5 Characteristics . 15
5.1 Summary of characteristics . 15
5.2 Type of equipment . 15
5.2.1 Number of poles . 15
5.2.2 Kind of current (alternating current or direct current) . 15
5.2.3 Method of operation . 15
5.2.4 Method of control . 16
5.2.5 Method of resetting after overload . 16
5.2.6 Method of rearming after short-circuit . 16
5.3 Rated and limiting values of the main circuit . 16
5.3.1 Rated voltages . 16
5.3.2 Currents and powers . 16
5.3.3 Rated frequency . 16
5.3.4 Rated duties . 16
5.3.5 Normal load and overload characteristics – Rated making and breaking
capacities . 17
5.3.6 Short circuit characteristics – Rated service short-circuit breaking
capacity (I ) . 17
cs
5.3.7 Pole impedance of a CPS (Z) . 17
5.4 Utilization categories. 17
5.4.1 General . 17
5.4.2 Assignment of utilization categories based on the results of tests . 18
5.4.3 Application of utilization categories for motor control duty . 19
5.5 Control circuits . 19
5.6 Auxiliary circuits . 20
5.7 Relays or releases . 20
5.7.1 Summary of characteristics . 20
5.7.2 Types of relays or releases . 20
5.7.3 Characteristic values . 21
5.7.4 Designation and current setting of overload relays or releases . 21
5.7.5 Time-current characteristics of over current relays or releases . 21
5.7.6 Influence of ambient air temperature. 22
6 Product information . 22
6.1 Nature of information . 22
6.1.1 Identification . 22
6.1.2 Characteristics. 22
6.2 Marking . 23
6.3 Instructions for installation, operation and maintenance . 24

6.4 Environmental information . 24
7 Normal service, mounting and transport conditions . 24
8 Constructional and performance requirements . 25
8.1 Constructional requirements . 25
8.1.1 General . 25
8.1.2 Materials . 25
8.1.3 Current-carrying parts and their connections . 26
8.1.4 Clearances and creepage distances . 26
8.1.5 Actuator . 26
8.1.6 Indication of the contact position . 27
8.1.7 Additional requirements for equipment suitable for isolation . 27
8.1.8 Terminals . 27
8.1.9 Additional requirements for equipment provided with a neutral pole . 27
8.1.10 Provisions for protective earthing . 27
8.1.11 Enclosures for equipment . 27
8.1.12 Degrees of protection of enclosed equipment . 28
8.1.13 Conduit pull-out, torque and bending with metallic conduits . 28
8.1.14 Limited energy source . 28
8.1.15 Stored charge energy circuit . 30
8.1.16 Fault and abnormal conditions . 30
8.1.17 Short-circuit and overload protection of ports . 31
8.2 Performance requirements . 31
8.2.1 Operating conditions . 31
8.2.2 Temperature-rise . 37
8.2.3 Dielectric properties . 39
8.2.4 Performance under no load, normal load and overload conditions . 39
8.2.5 Ability to make, carry and break short-circuit currents . 45
8.2.6 Pole impedance . 46
8.2.7 Leakage currents of equipment suitable for isolation . 46
8.2.8 Coil power consumption . 46
8.2.9 Co-ordination between a CPS and another short-circuit protective
device . 46
8.3 Electromagnetic compatibility (EMC) . 46
8.3.1 General . 46
8.3.2 Immunity . 47
8.3.3 Emission . 47
9 Tests . 48
9.1 Kind of tests . 48
9.1.1 General . 48
9.1.2 Type test . 48
9.1.3 Routine tests . 48
9.1.4 Sampling tests . 48
9.1.5 Special tests . 48
9.2 Compliance with constructional requirements . 49
9.2.1 General . 49
9.2.2 Electrical performance of screwless-type clamping units . 49
9.2.3 Ageing test for screwless-type clamping units . 50
9.2.4 Limited energy source test . 50
9.2.5 Breakdown of components . 51

– 4 – IEC 60947-6-2:2020  IEC 2020
9.3 Compliance with performance requirements . 51
9.3.1 Test sequences . 51
9.3.2 General test conditions . 52
9.3.3 Performance under no load, normal load and overload conditions . 52
9.3.4 Performance under short-circuit conditions . 61
9.4 EMC tests . 63
9.4.1 General . 63
9.4.2 Immunity . 64
9.4.3 Emission . 69
9.5 Test sequences . 70
9.5.1 General . 70
9.5.2 Test sequence I: temperature-rise, operating limits, dielectric properties . 71
9.5.3 Test sequence II: performance under normal load and overload
conditions . 75
9.5.4 Test sequence III: operational performance before and after operating
sequences at conventional prospective current I and conventional
cr
prospective current "r" test . 76
9.5.5 Test sequence IV: operational performance before and after operating
sequences at I . 77
cs
9.5.6 Test sequence V: additional breaking capacity . 78
9.5.7 Test sequence VI: additional test sequence for four-pole CPS's. 78
9.5.8 Test sequence VII: additional test sequence for CPS's intended for use
in an individual enclosure . 79
9.5.9 Test sequence VIII: EMC . 79
9.6 Routine tests. 79
9.6.1 General . 79
9.6.2 Operation and operating limits . 80
9.6.3 Dielectric tests . 80
Annex A (normative) Special tests . 81
A.1 General . 81
A.2 Mechanical durability . 81
A.2.1 General . 81
A.2.2 Verification of mechanical durability . 81
A.3 Electrical durability . 83
Annex B (xxx) Vacant . 84
Annex C (normative) Marking and identification of CPS terminals . 85
C.1 General . 85
C.2 Marking and identification of terminals of main circuits . 85
C.2.1 General . 85
C.2.2 Marking and identification of terminals of auxiliary circuits . 85
Annex D (informative) Items subject to agreement between manufacturer and user . 86
Annex E (xxx) Vacant . 87
Annex F (normative) Requirements for auxiliary contact linked with power contact
(mirror contact) . 88
F.1 Application and object . 88
F.1.1 Application . 88
F.1.2 Object . 88
F.2 Terms and definitions . 88
F.3 Characteristics . 88

F.4 Product information . 88
F.5 Normal service, mounting and transport conditions . 89
F.6 Constructional and performance requirements . 89
F.7 Tests . 89
F.7.1 General . 89
F.7.2 Tests on products in a new condition . 89
F.7.3 Test after conventional operational performance (defined under Table 10) . 90
Annex G (normative) Test sequence for CPS’s for IT systems . 91
G.1 General . 91
G.2 Individual pole short circuit . 91
G.3 Verification of dielectric withstand . 92
G.4 Verification of overload releases . 92
G.5 Marking . 92
Annex H (xxx) Vacant . 93
Annex I (informative) Glossary of symbols and graphical representation of
characteristics . 94
Annex J (xxx) Vacant . 95
Annex K (normative) Procedure to determine data for electromechanical CPS used in
functional safety applications . 96
K.1 General . 96
K.2 Test requirements . 96
K.3 Characterization of a failure mode . 96
K.4 Failure ratios of a CPS . 96
Annex L (xxx) Vacant . 98
Annex M (informative) Load monitoring indicators . 99
M.1 General . 99
M.2 Indicators list . 99
M.3 Uncertainty . 101
M.4 Tests . 102
M.4.1 Routine tests . 102
M.4.2 Type tests . 102
Annex N (normative) Additional requirements and tests for equipment with protective
separation . 104
N.1 General . 104
N.2 Terms and definitions . 104
N.3 Requirements . 104
N.3.1 Test method for implementing protective impedance . 104
N.3.2 Touch current measurement . 105
Bibliography . 107

Figure 1 – Multiple of current setting limits for ambient air temperature time-delay
overload relays or releases (see 8.2.1.5.1) . 34
Figure 2 – Thermal memory test . 36
Figure 3 – Voltage drop measurement at contact point of the clamping terminal . 50
Figure 4 – Example of a pole impedance measurement for a three-pole CPS . 59
Figure 5 – Representation of test current produced by back-to-back thyristors . 67
Figure 6 – Test current for the verification of the influence of the current dips and
interruptions. 68

– 6 – IEC 60947-6-2:2020  IEC 2020
Figure F.1 – Mirror contact . 89
Figure M.1 – Example of quantification of a process change . 101
Figure N.1 – Protection by means of protective impedance . 105
Figure N.2 – Measuring instrument . 106

Table 1 – Utilization categories . 18
Table 20 – Limits for limited energy sources without an over-current protective device . 29
Table 21 – Limits for limited energy sources with an over-current protective device . 29
Table 22 – Limits for limited energy source with current limiting impedance . 30
Table 2 – Limits of operation of inverse time-delay overload relays or releases when
energized on all poles . 33
Table 3 – Trip classes of overload relays or releases for utilization categories AC-2,
AC-3, AC-3e, AC-4, DC-3, DC-5 . 34
Table 4 – Limits of operation of three-pole inverse time-delay overload relays or
releases when energized on two poles only . 35
Table 5 – Temperature-rise limits of terminals . 37
Table 6 – Temperature-rise limits for insulated coils in air . 38
Table 7 – Intermittent duty test cycle data . 38
Table 8 – Rated making and breaking capacities – Making and breaking conditions
corresponding to the utilization categories . 40
Table 9 – Relationship between current broken I and OFF-time for the verification of
c
rated making and breaking capacities . 41
Table 10 – Conventional operational performance after making/breaking capacity tests
– Making and breaking conditions according to utilization category . 43
Table 11 – Operational performance before and after short-circuit tests at I and I –
cr cs
Making and breaking conditions according to utilization category . 44
Table 12 – Value of the prospective test current according to the rated operational
current . 45
Table 13 – Value of the prospective test current according to the rated operational
current (harmonized table) . 46
Table 14 – Performance criteria when EM disturbances are present . 47
Table 15 – EMC immunity tests . 64
Table 16 – Test parameters for harmonics and interruptions . 68
Table 17 – Terminal disturbance voltage limits for conducted radio-frequency emission
(for mains ports) . 69
Table 18 – Radiated emission test limits . 70
Table 19 – Test sequences . 70
Table F.1 – Test voltage according to altitude . 90
Table G.1 – Individual pole . 91
Table K.1 – Failure mode of CPS . 96
Table K.2 – Typical failure ratios for CPS. 97
Table M.1 – AC monitoring indicators list . 100
Table M.2 – Different possibilities authorized for verification of indicators . 102
Table M.3 – Reference for verification conditions . 103
Table M.4 – Harmonic levels . 103

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 6-2: Multiple function equipment –
Control and protective switching devices (or equipment) (CPS)

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 60947-6-2 has been prepared by subcommittee 121A: Low-voltage
switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and
their assemblies for low-voltage.
This third edition cancels and replaces the second edition published in 2002 and its
Amendment 1:2007. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• editorial changes according to ISO/IEC directives Part 2,
• alignments with IEC 60947-1:2020:
– markings ("s", "sol", "r" or "f");
– constructional requirements including material requirements;
– requirements for screwless terminals;

– 8 – IEC 60947-6-2:2020  IEC 2020
– measurement method of the pole impedance;
– EMC requirement and testing;
– procedure to determine data for electromechanical CPS’s used in functional safety
applications;
• harmonisation with IEC 60947-2:2016:
– operation tests of under-voltage relays and shunt releases;
– CPS for IT systems (Annex G);
– coordination with other short-circuit protective devices;
• alignments with IEC 60947-4-1:2018:
– test at the rated conditional short-circuit current I of protected switching devices;
q
– short-circuit tests harmonisation with North America;
– reliability data for functional safety applications (new Annex K);
– safety aspects related to electronic circuits and protective impedance (new Annex N);
– introduction of provisions covering the impact of higher locked rotor current to achieve
high efficiency class;
– mention of dedicated wiring accessories;
– definitions and measurement method of the power consumption of the control circuit
during holding and pick-up operations;
– load monitoring indicators (new Annex M).
The text of this International Standard is based on the following documents:
FDIS Report on voting
121A/384/FDIS 121A/392/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.
A list of all the parts in the IEC 60947 series, under the general title Low-voltage switchgear
and controlgear, can be found on the IEC website.
This document shall be read in conjunction with IEC 60947-1, Low voltage switchgear and
controlgear – Part 1: General rules.
The provisions of the general rules are applicable to this part of IEC 60947-6, where specifically
called for. General rules clauses and subclauses thus applicable as well as tables, figures and
annexes are identified by reference to IEC 60947-1, for example, 1.2.3, Table 4, or Annex A of
IEC 60947-1:2020.
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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 10 – IEC 60947-6-2:2020  IEC 2020
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 6-2: Multiple function equipment –
Control and protective switching devices (or equipment) (CPS)

1 Scope
This document applies to control and protective switching devices (or equipment) (CPS), the
main contacts of which are intended to be connected to circuits of rated voltage not exceeding
1 000 V AC or 1 500 V DC.
It covers control and protective switching device (CPS):
– which provides protective and control functions for circuits and motors;
– where its control function is operated exclusively otherwise than by hand;
– which provides continuity of service after over-current conditions; and
– which can have additional functions, such as isolation or communication.
This document does not apply to:
– auxiliary contacts, covered by IEC 60947-5-1;
– CPS used downstream to frequency drive ;
NOTE Additional requirements for CPS used downstream to frequency drive are under consideration for the
next maintenance cycle.
– the use of the product with additional measure within explosive atmospheres, covered by
IEC 60079 (all parts);
– embedded software design rules, covered by IEC TR 63201;
– cyber security aspects, covered by IEC TS 63208.
The object of this document is to state:
– the characteristics of CPS's;
– the conditions with which CPS's are complying with reference to their operation and
behaviour, their dielectric properties, the degree of protection provided by their enclosure
where applicable, its construction including safety measures against electric shock, fire
hazard and mechanical hazard;
– the tests intended to verify that these conditions have been met, and the methods to be
adopted for these tests;
– the information to be marked on or given with the CPS's.
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.
___________
For this subject, the manufacturer is responsible to take additional safety measures.

IEC 60034-1:2017, Rotating electrical machines – Part 1: Rating and performance
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-
symbols.info/equipment)
IEC 60617, Graphical symbols for diagrams (available at http://std.iec.ch/iec60617)
IEC 60715:2017, Dimensions of low-voltage switchgear and controlgear – Standardized
mounting on rails for mechanical support of switchgear, controlgear and accessories
IEC 60730-1, Automatic electrical controls – Part 1: General requirements
IEC 60947-1:2020, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-2:2016, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-2:2016/AMD1:2019
IEC 60947-5-1:2016, Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices
and switching elements – Electromechanical control circuit devices
IEC 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards – Immunity
standard for industrial environments
IEC 61051-2, Varistors for use in electronic equipment – Part 2: Sectional specification for surge
suppression varistors
CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 11:2015/AMD1:2016
CISPR 11:2015/AMD2:2019
CISPR 32, Electromagnetic compatibility of multimedia equipment – Emission requirements
ISO 3864-2, Graphical symbols – Safety colours and safety signs – Part 2: Design principles
for product safety labels
...