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

IEC 60947-3:2020 applies to switches, disconnectors, switch-disconnectors and fuse-combination 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.
This fourth edition cancels and replaces the third edition published in 2008, Amendment 1:2012 and Amendment 2:2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
addition of critical load current tests for DC switches (see 9.3.9);
addition of requirements for a conditional short-circuit rating for disconnectors, switches, and switch-disconnectors protected by circuit-breakers (see 9.3.7.2);
addition of new categories for high-efficiency motors switching (see Annex A);
addition of new Annex E for connection to aluminium conductors;
addition of new Annex F for power losses measurement.

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

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.

General Information

Status
Published
Publication Date
21-Apr-2020
Current Stage
PPUB - Publication issued
Completion Date
22-Apr-2020
Ref Project

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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
IEC 60947-3:2020-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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: 3 ----------------------
– 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

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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

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– 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 ............................................................................................ 64

D.3 Terms and definitions ............................................................................................ 64

D.4 Classification ........................................................................................................ 65

D.4.1 According to the utilization category .............................................................. 65

D.5 Characteristics ...................................................................................................... 65

D.6 Product information ............................................................................................... 66

D.7 Normal service, mounting and transport conditions ............................................... 66

D.8 Constructional and performance requirements ...................................................... 66

D.9 Tests .................................................................................................................... 70

Annex E (normative) Additional requirements for LV switchgear intended for

connection of aluminium conductors ..................................................................................... 76

E.1 Object ................................................................................................................... 76

E.2 Normative references ............................................................................................ 76

E.3 Terms, definitions and index of terms .................................................................... 76

E.4 Classification ........................................................................................................ 77

E.5 Characteristics ...................................................................................................... 77

E.6 Product information ............................................................................................... 77

E.6.1 Nature of information ..................................................................................... 77

E.6.2 Marking ......................................................................................................... 77

E.6.3 Instructions for installation, operation and maintenance,

decommissioning and dismantling .................................................................. 77

E.7 Normal service, mounting and transport conditions ............................................... 78

E.8 Constructional and performance requirements ...................................................... 78

E.9 Tests .................................................................................................................... 78

E.9.1 General ......................................................................................................... 78

---------------------- Page: 6 ----------------------
IEC 60947-3:2020 © IEC 2020 – 5 –

E.9.2 Current cycling test........................................................................................ 79

E.9.3 Mechanical properties of terminals ................................................................ 84

E.9.4 Test for insertability of unprepared round aluminium conductors having

the maximum cross-section ........................................................................... 85

Annex F (informative) Power loss......................................................................................... 88

F.1 General ................................................................................................................. 88

F.2 Test methods ........................................................................................................ 88

F.2.1 General ......................................................................................................... 88

F.2.2 General case for AC switches and/or disconnectors ...................................... 88

F.2.3 General case for AC fused combination units and fuse disconnectors ............ 88

F.2.4 Switches and/or disconnectors of rated current not exceeding 400 A ............. 89

F.2.5 Fused combination units and fuse disconnectors of rated current not

exceeding 400 A ............................................................................................ 89

F.3 Test procedure ...................................................................................................... 90

Bibliography .......................................................................................................................... 93

Figure C.1 – Typical arrangements ....................................................................................... 62

Figure E.1 – General test arrangement ................................................................................. 80

Figure E.2 – Mounting of terminals for the current cycling test .............................................. 80

Figure F.1 – Example of power loss measurement according to F.2.2 ................................... 90

Figure F.2 – Example of power loss measurement according to F.2.3 ................................... 91

Figure F.3 – Example of power loss measurement according to F.2.4 ................................... 91

Figure F.4 – Example of power loss measurement according to F.2.5 ................................... 92

Table 1 – Summary of equipment definitions ......................................................................... 16

Table 2 – Utilization categories ............................................................................................. 19

Table 3 – Product information ............................................................................................... 21

Table 4 – Verification of rated making and breaking capacities (see 9.3.4.4) –

Conditions for making and breaking corresponding to the various utilization categories ........ 25

Table 5 – Verification of operational performance – Number of operating cycles

corresponding to the rated operational current ...................................................................... 26

Table 6 – Test circuit parameters for Table 5 ........................................................................ 26

Table 7 – Immunity tests ....................................................................................................... 28

Table 8 – Emission limits ...................................................................................................... 28

Table 9 – List of type tests applicable to a given equipment .................................................. 31

Table 10 – Overall scheme of test sequences ....................................................................... 32

Table 11 – Test sequence I: general performance characteristics ......................................... 36

Table 12 – Temperature-rise limits for terminals and accessible parts ................................... 39

Table 13 – Test sequence II: operational performance capability .......................................... 40

Table 14 – Test sequence III: short-circuit performance capability ........................................ 42

Table 15 – Test sequence IV: conditional short-circuit current – circuit-breaker

protected .............................................................................................................................. 46

Table 16 – Test sequence IV: conditional short-circuit current – fuse protected .................... 47

Table 17 – Test sequence V: overload performance capability .............................................. 49

Table 18 – Number of operating cycles corresponding to the critical load current .................. 51

Table 19 – Test circuit parameters for Table 18 .................................................................... 51

---------------------- Page: 7 ----------------------
– 6 – IEC 60947-3:2020 © IEC 2020

Table 20 – Test sequence VI: critical load current performance of equipment with a DC

rating .................................................................................................................................... 51

Table A.1 – Utilization categories .......................................................................................... 55

Table A.2 – Rated making and breaking capacity conditions corresponding to several

utilization categories ............................................................................................................. 56

Table A.3 – Relationship between current broken I and off-time for the verification of

the rated making and breaking capacities ............................................................................. 57

Table A.4 – Operational performance – Conditions for making and breaking

corresponding to several utilization categories ...................................................................... 57

Table A.5 – Verification of the number of on-load operating cycles – Conditions for

making and breaking corresponding to several utilization categories ..................................... 60

Table D.1 – Utilization categories ......................................................................................... 65

Table D.2 – Service arrangements ........................................................................................ 66

Table D.3 – Environmental conditions ................................................................................... 66

Table D.4 – Rated impulse withstand levels for PV switches, PV disconnectors, PV
switch-di
...

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