Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units (IEC 60947-3:2020)

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.

Niederspannungsschaltgeräte - Teil 3: Lastschalter, Trennschalter, Lasttrennschalter und Schalter-Sicherungs-Einheiten (IEC 60947-3:2020)

Appareillage à basse tension - Partie 3: Interrupteurs, sectionneurs, interrupteurs-sectionneurs et combinés-fusibles (IEC 60947-3:2020)

L’IEC 60947-3:2020 s’applique à l’appareillage suivant: interrupteurs, sectionneurs, interrupteurs-sectionneurs, combinés-fusibles et leurs accessoires dédiés, destinés à être insérés dans des circuits de distribution et des circuits de moteurs dont la tension assignée est inférieure ou égale à 1 000 V en courant alternatif ou à 1 500 V en courant continu. Cette quatrième édition annule et remplace la troisième édition parue en 2008, l’Amendement 1:2012 et l’Amendement 2:2015. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:  ajout d'essais de courant critique de charge pour interrupteurs à courant continu (voir 9.3.9); ajout d’exigences relatives à la caractéristique assignée de court-circuit conditionnel pour les sectionneurs, les interrupteurs et les interrupteurs-sectionneurs protégés par des disjoncteurs (voir 9.3.7.2); ajout de nouvelles catégories pour commande de moteurs à haut rendement (voir Annexe A); ajout d’une nouvelle Annexe E pour le raccordement à des conducteurs en aluminium; ajout d’une nouvelle Annexe F pour la mesure des puissances dissipées.

Nizkonapetostne stikalne in krmilne naprave - 3. del: Stikala, ločilniki, ločilna stikala in stikalni aparati z varovalkami (IEC 60947-3:2020)

General Information

Status
Published
Publication Date
07-Mar-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Mar-2021
Due Date
10-May-2021
Completion Date
08-Mar-2021

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SLOVENSKI STANDARD
SIST EN IEC 60947-3:2021
01-maj-2021
Nadomešča:
SIST EN 60947-3:2009
SIST EN 60947-3:2009/A1:2012
SIST EN 60947-3:2009/A2:2016

Nizkonapetostne stikalne in krmilne naprave - 3. del: Stikala, ločilniki, ločilna

stikala in stikalni aparati z varovalkami (IEC 60947-3:2020)

Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-

disconnectors and fuse-combination units (IEC 60947-3:2020)

Niederspannungsschaltgeräte - Teil 3: Lastschalter, Trennschalter, Lasttrennschalter und

Schalter-Sicherungs-Einheiten (IEC 60947-3:2020)

Appareillage à basse tension - Partie 3: Interrupteurs, sectionneurs, interrupteurs-

sectionneurs et combinés-fusibles (IEC 60947-3:2020)
Ta slovenski standard je istoveten z: EN IEC 60947-3:2021
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN IEC 60947-3:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60947-3:2021
---------------------- Page: 2 ----------------------
SIST EN IEC 60947-3:2021
EUROPEAN STANDARD EN IEC 60947-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2021
ICS 29.120.40; 29.130.20 Supersedes EN 60947-3:2009 and all of its amendments
and corrigenda (if any)
English Version
Low-voltage switchgear and controlgear - Part 3: Switches,
disconnectors, switch-disconnectors and fuse-combination units
(IEC 60947-3:2020)

Appareillage à basse tension - Partie 3: Interrupteurs, Niederspannungsschaltgeräte - Teil 3: Lastschalter,

sectionneurs, interrupteurs-sectionneurs et combinés- Trennschalter, Lasttrennschalter und Schalter-Sicherungs-

fusibles Einheiten
(IEC 60947-3:2020) (IEC 60947-3:2020)

This European Standard was approved by CENELEC on 2020-05-27. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60947-3:2021 E
---------------------- Page: 3 ----------------------
SIST EN IEC 60947-3:2021
EN IEC 60947-3:2021 (E)
European foreword

The text of document 121A/340/FDIS, future edition 4 of IEC 60947-3, prepared by SC 121A “Low-

voltage switchgear and controlgear” of IEC/TC 121 “Switchgear and controlgear and their assemblies

for low voltage” was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN IEC 60947-3:2021.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021–08-19

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024–02-19

document have to be withdrawn

This document supersedes EN 60947-3:2009 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

This document has been prepared under a mandate given to CENELEC by the European Commission

and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For the relationship with EU Directive(s) see informative Annexes ZZA and ZZB, which is an integral

part of this document.
Endorsement notice

The text of the International Standard IEC 60947-3:2020 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60364-5-52 NOTE Harmonized as HD 60364-5-52
IEC 60447:2004 NOTE Harmonized as EN 60447:2004 (not modified)
IEC 60664-1:2007 NOTE Harmonized as EN 60664-1:2007 (not modified)
IEC 60898-1:2015 NOTE Harmonized as EN 60898-1:2019
IEC 60947-2:2016 NOTE Harmonized as EN 60947-2:2017 (not modified)
IEC 60947-4-1:2018 NOTE Harmonized as EN IEC 60947-4-1:2019 (not modified)
---------------------- Page: 4 ----------------------
SIST EN IEC 60947-3:2021
EN IEC 60947-3:2021 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the

relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-441 - Electrotechnical Vocabulary – Switchgear, - -
controlgear and fuses
IEC 60034-12 2016 Rotating electrical machines - Part 12: EN 60034-12 2017
Starting performance of single-speed
three-phase cage induction motors
IEC 60034-30-1 2014 Rotating electrical machines - Part 30–1: EN 60034-30-1 2014
Efficiency classes of line operated AC
motors (IE code)

IEC 60068-2-14 2009 Environmental testing – Part 2–14: Tests – EN 60068-2-14 2009

Test N: Change of temperature
IEC 60228 2004 Conductors of insulated cables EN 60228 2005
+AC 2005
IEC 60269 (all parts) Low-voltage fuses EN 60269 (series)
IEC 60417 - Graphical symbols for use on equipment - -
IEC 60695-2-11 2014 Fire hazard testing - Part 2–11: EN 60695-2-11 2014
Glowing/hot-wire based test methods -
Glow-wire flammability test method for end
products (GWEPT)
IEC 60947-1 2020 Low-voltage switchgear and controlgear - EN IEC 60947-1 2021
Part 1: General rules
IEC 60947-5-1 2016 Low-voltage switchgear and controlgear - EN 60947-5-1 2017
Part 5–1: Control circuit devices and
+ CORR 1 2016 switching elements - Electromechanical
control circuit devices
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) – Part EN 61000-4-2 2009
4–2: Testing and measurement techniques
– Electrostatic discharge immunity test
IEC 61000-4-3 2006 , Electromagnetic compatibility (EMC) – EN 61000-4-3 2006
Part 4–3: Testing and measurement
+A1 2007 techniques – Radiated, radio-frequency, +A1 2008
+A2 2010 electromagnetic field immunity test +A2 2010
---------------------- Page: 5 ----------------------
SIST EN IEC 60947-3:2021
EN IEC 60947-3:2021 (E)
Publication Year Title EN/HD Year
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) – Part EN 61000-4-4 2012
4–4: Testing and measurement techniques
– Electrical fast transient/burst immunity
test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) – Part EN 61000-4-5 2014
4–5: Testing and measurement techniques
+A1 2017 – Surge immunity test +A1 2017
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) – Part EN 61000-4-6 2014
4–6: Testing and measurement techniques +AC1 2015
– Immunity to conducted disturbances,
induced by radio-frequency fields
IEC 61238-1-1 - Compression and mechanical connectors EN IEC 61238-1- 2019
for power cables - Part 1–1: Test methods 1
and requirements for compression and
mechanical connectors for power cables
for rated voltages up to 1 kV (Um = 1,2 kV)
tested on non-insulated conductors
IEC 61545 1996 Connecting devices - Devices for the - -
connection of aluminium conductors in
clamping units of any material and copper
conductors in aluminium bodied clamping
units
IEC 62208 2011 Empty enclosures for low-voltage EN 62208 2011
switchgear and controlgear assemblies -
General requirements
IEC 62475 2010 High-current test techniques - Definitions EN 62475 2010
and requirements for test currents and
measuring systems
ISO 2859-1 1999 Sampling procedures for inspection by - -
attributes - Part 1: Sampling schemes
+A1 2011 indexed by acceptance quality limit (AQL)
for lot-by-lot inspection
CISPR 11 2015 Industrial, scientific and medical equipment EN 55011 2016
– Radio-frequency disturbance (modified)
+A1 2016 characteristics – Limits and methods of +A1 2017
measurement
CISPR 32 2015 Electromagnetic compatibility of multimedia EN 55032 2015
equipment - Emission requirements +AC 2016
---------------------- Page: 6 ----------------------
SIST EN IEC 60947-3:2021
EN IEC 60947-3:2021 (E)
Annex ZZA
(informative)
Relationship between this European standard and the essential
requirements of Directive 2014/30/EU [2014 OJ L96] aimed to be
covered

This European standard has been prepared under the European Commission standardization request

C(2016) 7641 final of 30.11.2016 , ('M/552'), as regards harmonized standards in support of Directive

2014/30/EU relating to electromagnetic compatibility, to provide one voluntary means of conforming to

essential requirements of Directive 2014/30/EU of the European Parliament and of the Council of 26

February 2014 on the harmonization of the laws of the Member States relating to electromagnetic

compatibility [2014 OJ L96].

Once this standard is cited in the Official Journal of the European Union under that Directive,

compliance with the normative clauses of this standard given in Table ZZA.1 confers, within the limits

of the scope of this standard, a presumption of conformity with the corresponding essential

requirements of that Directive, and associated EFTA regulations.
Table ZZA.1 — Correspondence between this European standard and the Essential
Requirements set out in Directive 2014/30/EU [2014 OJ L96]
Clause(s) / sub-clause(s)
Essential requirements of Directive
Remarks / Notes
2014/30/EU
of this EN
Annex I. 1(a) (electromagnetic disturbances) 8.3.3, 9.4.3, D.9.4
Annex I. 1(b) (electromagnetic immunity) 8.3.2, 9.4.2, D.9.4

WARNING 1: Presumption of conformity stays valid only as long as a reference to this European

standard is maintained in the list published in the Official Journal of the European Union. Users of this

standard should consult frequently the latest list published in the Official Journal of the European

Union.

WARNING 2: Other Union legislation may be applicable to the product(s) falling within the scope of

this standard.

COMMISSION IMPLEMENTING DECISION C(2016) 7641 final of 30.11.2016 on a standardisation request to the European

Committee for Standardisation, to the European Committee for Electrotechnical Standardisation and to the European

Telecommunications Standards Institute as regards harmonised standards in support of Directive 2014/30/EU of the European

Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to

electromagnetic compatibility.
---------------------- Page: 7 ----------------------
SIST EN IEC 60947-3:2021
EN IEC 60947-3:2021 (E)
Annex ZZB
(informative)
Relationship between this European standard and the safety
objectives of Directive 2014/35/EU [2014 OJ L96] aimed to be
covered

This European standard has been prepared under a Commission’s standardization request relating to

harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means

of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the

Council of 26 February 2014 on the harmonization of the laws of the Member States relating to the

making available on the market of electrical equipment designed for use within certain voltage limits

[2014 OJ L96].

Once this standard is cited in the Official Journal of the European Union under that Directive,

compliance with the normative clauses of this standard given in Table ZZB.1 confers, within the limits

of the scope of this standard, a presumption of conformity with the corresponding safety objectives of

that Directive, and associated EFTA regulations.

Table ZZB.1 — Correspondence between this European standard and Annex I of Directive

2014/35/EU [2014 OJ L96]
Safety objectives of Clause(s) / sub-clause(s) of this EN Remarks/note
Directive 2014/35/EU
1 a) 1, 2, 3, 6.2, 6.3, Annex D, Annex E
1 b) 1, 2, 3, 6.2, 6.3, Annex C, Annex D,
Annex E

1 c) 1, 2, 3, 5, 6, 7, A.1, A.2, C.1, D.1, D.2, Also refer to 2 a) to 2 d) and 3 a)

E.1, E.6.3 to 3 c) in this table
2 a) 1, 2, 3, 8.1, 8.2, 9.1, 9.3, 9.5, Annex A,
Annex C, Annex D
2 b) 1, 2, 3, 5, 8.1, 8.2.2, 9.3, Annex A,
Annex C, Annex D, Annex E
2 c) 1, 2, 3, 6, 8.1, 8.2, 8.3, 9.1, 9.2, 9.3,
Annex A, Annex C, Annex D, Annex E
2 d) 1, 2, 3, 4.3, 5, 6.2, 6.3, 8.1, 8.2, 9.1,
9.2, 9.3, 9.5, Annex A, Annex C,
Annex D, Annex E
3 a) 1, 2, 3, 5, 6, 8.2, 8.3, 9.1, 9.2, 9.3, 9.5,
Annex A, Annex C, Annex D, Annex E
3 b) 1, 2, 3, 6.2, 6.3, 7, Annex D
3 c) 1, 2, 3, 6.3, 8.3, 9.3, Annex D, Annex E

WARNING 1: Presumption of conformity stays valid only as long as a reference to this European

standard is maintained in the list published in the Official Journal of the European Union. Users of this

standard should consult frequently the latest list published in the Official Journal of the European

Union.

WARNING 2: Other Union legislation may be applicable to the product(s) falling within the scope of

this standard.
---------------------- Page: 8 ----------------------
SIST EN IEC 60947-3:2021
IEC 60947-3
Edition 4.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination
units
Appareillage à basse tension –
Partie 3: Interrupteurs, sectionneurs, interrupteurs-sectionneurs et combinés-
fusibles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.40; 29.130.20 ISBN 978-2-8322-8153-6

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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 9 ----------------------
SIST EN IEC 60947-3:2021
– 2 – IEC 60947-3:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 7

INTRODUCTION ..................................................................................................................... 9

1 Scope ............................................................................................................................ 10

2 Normative references .................................................................................................... 11

3 Terms, definitions and index of terms ............................................................................ 12

3.1 General ................................................................................................................. 12

3.2 Alphabetical index of terms ................................................................................... 12

3.3 General terms ....................................................................................................... 13

4 Classification ................................................................................................................. 15

4.1 According to the utilization category ...................................................................... 15

4.2 According to the method of operation .................................................................... 15

4.2.1 Manually operated equipment ........................................................................ 15

4.2.2 Remotely operated equipment ....................................................................... 15

4.3 According to suitability for isolation ....................................................................... 16

4.4 According to the degree of protection provided ..................................................... 16

4.5 Summary of symbols for equipment types ............................................................. 16

5 Characteristics .............................................................................................................. 16

5.1 Summary of characteristics ................................................................................... 16

5.2 Type of equipment ................................................................................................ 17

5.3 Rated and limiting values for the main circuit ........................................................ 17

5.3.1 General ......................................................................................................... 17

5.3.2 Rated voltages .............................................................................................. 17

5.3.3 Currents ........................................................................................................ 17

5.3.4 Rated frequency ............................................................................................ 17

5.3.5 Rated duty ..................................................................................................... 18

5.3.6 Normal load and overload characteristics ...................................................... 18

5.3.7 Short-circuit characteristics ........................................................................... 18

5.4 Utilization category ............................................................................................... 19

5.5 Control circuits ...................................................................................................... 20

5.6 Auxiliary circuits .................................................................................................... 20

5.7 Relays and releases ............................................................................................. 20

5.8 Co-ordination with short-circuit protective devices (SCPD) .................................... 20

6 Product information ....................................................................................................... 20

6.1 Nature of information ............................................................................................ 20

6.2 Marking ................................................................................................................. 20

6.3 Instructions for installation, operation and maintenance, decommissioning

and dismantling..................................................................................................... 22

7 Normal service, mounting and transport conditions ........................................................ 22

8 Constructional and performance requirements ............................................................... 22

8.1 Constructional requirements ................................................................................. 22

8.1.1 General ......................................................................................................... 22

8.2 Performance requirements .................................................................................... 23

8.2.1 Operating conditions ...................................................................................... 23

8.2.2 Temperature-rise ........................................................................................... 24

8.2.3 Dielectric properties ....................................................................................... 24

---------------------- Page: 10 ----------------------
SIST EN IEC 60947-3:2021
IEC 60947-3:2020 © IEC 2020 – 3 –
8.2.4 Ability to make and break under no-load, normal load and

overload conditions ........................................................................................ 24

8.2.5 Ability to make, break or withstand short-circuit currents ............................... 27

8.2.6 Void ............................................................................................................... 27

8.2.7 Additional performance requirements for equipment suitable for

isolation ......................................................................................................... 27

8.2.8 Critical load current performance: DC equipment ........................................... 27

8.2.9 Overload requirements for equipment incorporating fuses.............................. 27

8.3 Electromagnetic compatibility (EMC) ..................................................................... 27

8.3.1 General ......................................................................................................... 27

8.3.2 Immunity ........................................................................................................ 27

8.3.3 Emission ........................................................................................................ 28

9 Tests ............................................................................................................................. 29

9.1 Kinds of test .......................................................................................................... 29

9.1.1 General ......................................................................................................... 29

9.1.2 Type tests ...................................................................................................... 29

9.1.3 Routine tests ................................................................................................. 29

9.1.4 Sampling tests ............................................................................................... 30

9.1.5 Special tests .................................................................................................. 30

9.2 Compliance with constructional requirements ........................................................ 30

9.2.1 General ......................................................................................................... 30

9.3 Performance ......................................................................................................... 31

9.3.1 General ......................................................................................................... 31

9.3.2 Test sequences ............................................................................................. 31

9.3.3 General test conditions .................................................................................. 32

9.3.4 Test sequence I: general performance characteristics ................................... 35

9.3.5 Test sequence II: operational performance capability .................................... 39

9.3.6 Test sequence III: short-circuit performance capability................................... 41

9.3.7 Test sequence IV: conditional short-circuit current ......................................... 45

9.3.8 Test sequence V: overload performance capability ........................................ 48

9.3.9 Test sequence VI: critical load current performance of equipment with a

DC rating ....................................................................................................... 49

9.4 Electromagnetic compatibility tests ....................................................................... 51

9.4.1 General ......................................................................................................... 51

9.4.2 Immunity ........................................................................................................ 52

9.4.3 Emission ........................................................................................................ 52

9.5 Special tests ......................................................................................................... 52

9.5.1 Mechanical and electrical durability ............................................................... 52

9.5.2 Mechanical durability ..................................................................................... 52

9.5.3 Electrical durability ........................................................................................ 52

9.5.4 Damp heat, salt mist, vibration and shock ...................................................... 53

Annex A (normative) Equipment for direct switching of a single motor .................................. 54

A.1 General ................................................................................................................. 54

A.2 Rated .................................................................................................................... 54

A.2.1 Intermittent periodic duty or intermittent duty ................................................. 54

A.2.2 Temporary duty ............................................................................................. 54

A.3 Making and breaking capacities ............................................................................ 54

A.4 Utilization category ............................................................................................... 54

A.5 Operational performance ...................................................................................... 57

---------------------- Page: 11 ----------------------
SIST EN IEC 60947-3:2021
– 4 – IEC 60947-3:2020 © IEC 2020

A.6 Mechanical durability ............................................................................................ 58

A.7 Electrical durability ............................................................................................... 58

A.8 Verification of making and breaking capacities ...................................................... 58

A.9 Operational performance test ................................................................................ 58

A.10 Special tests ......................................................................................................... 58

A.10.1 General ......................................................................................................... 58

A.10.2 Mechanical durability test .............................................................................. 59

A.10.3 Electrical durability test.................................................................................. 59

A.11 Critical load current performance for DC equipment .............................................. 60

Annex B (informative) Items subject to agreement between manufacturer and user ............. 61

Annex C (normative) Single pole operated three-pole switches ............................................ 62

C.1 General ................................................................................................................. 62

C.2 Tests .................................................................................................................... 63

C.3 Test set-up and sequence ..................................................................................... 63

C.3.1 Making and breaking capacities (9.3.4.4) and operational performance

(9.3.5.2) ......................................................................................................... 63

C.3.2 Fuse protected short-circuit test (9.3.7.3) ...................................................... 63

C.4 Condition of equipment after tests ......................................................................... 63

C.5 Instructions for use ............................................................................................... 63

Annex D (normative) Switches, disconnectors, switch-disconnectors and fuse-

combination units for use in photovoltaic (PV) DC applications ............................................. 64

D.1 General ................................................................................................................. 64

D.1.1 Background ................................................................................................... 64

D.1.2 Object ............................................................................................................ 64

D.2 Normative references ..................................................................................

...

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