Low-voltage switchgear and controlgear - Part 2: Circuit-breakers

IEC 60947-2:2016 is available as IEC 60947-2:2016 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60947-2:2016 applies to circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.; it also contains additional requirements for integrally fused circuit-breakers. This fifth edition cancels and replaces the fourth edition published in 2006, Amendment 1:2009 and Amendment 2:2013. This edition constitutes a technical revision. This edition includes the following significant additions with respect to the previous edition:
- tests for verification of selectivity in Annex A (see A.5.3);
- critical load current tests for d.c. circuit-breakers (see 8.3.9);
- new Annex P for circuit-breakers for use in photovoltaic applications;
- new Annex R for residual-current circuit-breakers with automatic reclosing functions. The contents of the corrigendum of November 2016 have been included in this copy.

Appareillage à basse tension - Partie 2: Disjoncteurs

L'IEC 60947-2:2016 est applicable aux disjoncteurs dont les contacts principaux sont destinés à être reliés à des circuits dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu; elle contient aussi des exigences supplémentaires pour les disjoncteurs à fusibles incorporés. Cette cinquième édition annule et remplace la quatrième édition parue en 2006, l'Amendement 1:2009 et l'Amendement 2:2013. Cette édition constitue une révision technique. Cette édition inclut les additions techniques majeures suivantes par rapport à l'édition précédente:
- essais pour la vérification de la sélectivité dans l'Annexe A (voir A.5.3),
- essais de courants de charge critiques pour disjoncteurs à courant continu (voir 8.3.9),
- nouvelle Annexe P relative aux disjoncteurs pour utilisation dans des applications photovoltaïques,
- nouvelle Annexe R relative aux disjoncteurs de courant différentiel résiduel avec fonctions de refermeture automatique. Le contenu du corrigendum de novembre 2016 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
06-Jun-2016
Current Stage
PPUB - Publication issued
Completion Date
07-Jun-2016
Ref Project

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IEC 60947-2
Edition 5.0 2016-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
IEC 60947-2:2016-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60947-2
Edition 5.0 2016-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-3355-9

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

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60947-2:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 14

1 General ......................................................................................................................... 16

1.1 Scope and object .................................................................................................. 16

1.2 Normative references ............................................................................................ 17

2 Terms and definitions..................................................................................................... 18

3 Classification ................................................................................................................. 22

4 Characteristics of circuit-breakers .................................................................................. 23

4.1 Summary of characteristics ................................................................................... 23

4.2 Type of circuit-breaker .......................................................................................... 23

4.3 Rated and limiting values of the main circuit .......................................................... 23

4.3.1 General ........................................................................................................ 23

4.3.2 Rated voltages ............................................................................................. 23

4.3.3 Currents ....................................................................................................... 24

4.3.4 Rated frequency ........................................................................................... 24

4.3.5 Rated duty ................................................................................................... 24

4.3.6 Short-circuit characteristics .......................................................................... 24

4.4 Selectivity categories ............................................................................................. 27

4.5 Control circuits ...................................................................................................... 27

4.5.1 Electrical control circuits .............................................................................. 27

4.5.2 Air-supply control circuits (pneumatic or electro-pneumatic) .......................... 27

4.6 Auxiliary circuits .................................................................................................... 27

4.7 Releases ............................................................................................................... 28

4.7.1 Types ........................................................................................................... 28

4.7.2 Characteristics ............................................................................................. 28

4.7.3 Current setting of over-current releases ........................................................ 28

4.7.4 Tripping time setting of over-current releases ............................................... 29

4.8 Integral fuses (integrally fused circuit-breakers) ..................................................... 29

5 Product information ........................................................................................................ 29

5.1 Nature of the information ....................................................................................... 29

5.2 Marking ................................................................................................................. 29

5.3 Instructions for installation, operation and maintenance ......................................... 31

6 Normal service, mounting and transport conditions ......................................................... 31

7 Constructional and performance requirements................................................................ 31

7.1 Constructional requirements .................................................................................. 31

7.1.1 General ........................................................................................................ 31

7.1.2 Withdrawable circuit-breakers ...................................................................... 31

7.1.3 Additional requirements for circuit-breakers suitable for isolation .................. 32

7.1.4 Clearances and creepage distances ............................................................. 32

7.1.5 Requirements for the safety of the operator .................................................. 32

7.1.6 List of construction breaks............................................................................ 32

7.1.7 Additional requirements for circuit-breakers provided with a neutral pole ....... 33

7.1.8 Digital inputs and outputs for use with programmable logic controllers

(PLCs) ........................................................................................................... 33

7.2 Performance requirements .................................................................................... 33

7.2.1 Operating conditions .................................................................................... 33

7.2.2 Temperature-rise ......................................................................................... 36

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IEC 60947-2:2016 © IEC 2016 – 3 –

7.2.3 Dielectric properties ..................................................................................... 37

7.2.4 Ability to make and break under no load, normal load and overload

conditions ...................................................................................................... 37

7.2.5 Ability to make and break under short-circuit conditions ................................ 38

7.2.6 Vacant ......................................................................................................... 38

7.2.7 Additional requirements for circuit-breakers suitable for isolation .................. 38

7.2.8 Specific requirements for integrally fused circuit-breakers ............................. 39

7.2.9 Co-ordination between a circuit-breaker and another short-circuit

protective device ............................................................................................ 39

7.3 Electromagnetic compatibility (EMC) ..................................................................... 39

8 Tests ............................................................................................................................. 39

8.1 Kind of tests .......................................................................................................... 39

8.1.1 General ........................................................................................................ 39

8.1.2 Type tests .................................................................................................... 39

8.1.3 Routine tests ................................................................................................ 40

8.2 Compliance with constructional requirements ........................................................ 40

8.3 Type tests ............................................................................................................. 40

8.3.1 Test sequences ............................................................................................ 40

8.3.2 General test conditions ................................................................................. 48

8.3.3 Test sequence I: General performance characteristics .................................. 56

8.3.4 Test sequence II: Rated service short-circuit breaking capacity ..................... 65

8.3.5 Test sequence III: Rated ultimate short-circuit breaking capacity .................. 66

8.3.6 Test sequence IV: Rated short-time withstand current .................................. 68

8.3.7 Test sequence V: Performance of integrally fused circuit-breakers ................ 69

8.3.8 Test sequence VI: combined test sequence .................................................. 71

8.3.9 Critical d.c. load current test ......................................................................... 72

8.4 Routine tests ......................................................................................................... 73

8.4.1 General ........................................................................................................ 73

8.4.2 Mechanical operation tests ........................................................................... 74

8.4.3 Verification of the calibration of overcurrent releases .................................... 74

8.4.4 Verification of the operation of undervoltage and shunt releases ................... 75

8.4.5 Additional tests for CBRs ............................................................................. 75

8.4.6 Dielectric tests ............................................................................................. 75

8.4.7 Test for the verification of clearances less than those corresponding to

case A of Table 13 of IEC 60947-1:2007 ........................................................ 76

8.5 Special tests – Damp heat, salt mist, vibration and shock ...................................... 76

Annex A (normative) Co-ordination between a circuit-breaker and another short-circuit

protective device associated in the same circuit ..................................................................... 79

A.1 General ................................................................................................................. 79

A.2 Scope and object .................................................................................................. 79

A.3 General requirements for the co-ordination of a circuit-breaker with another

SCPD .................................................................................................................... 80

A.3.1 General considerations ................................................................................ 80

A.3.2 Take-over current ......................................................................................... 80

A.3.3 Behaviour of C in association with another SCPD ....................................... 80

A.4 Type and characteristics of the associated SCPD .................................................. 80

A.5 Verification of selectivity ........................................................................................ 81

A.5.1 General ........................................................................................................ 81

A.5.2 Consideration of selectivity by desk study ..................................................... 81

A.5.3 Selectivity determined by test ....................................................................... 82

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– 4 – IEC 60947-2:2016 © IEC 2016

A.6 Verification of back-up protection .......................................................................... 83

A.6.1 Determination of the take-over current .......................................................... 83

A.6.2 Verification of back-up protection ................................................................. 83

A.6.3 Tests for verification of back-up protection ................................................... 83

A.6.4 Results to be obtained .................................................................................. 84

Annex B (normative) Circuit-breakers incorporating residual current protection .................... 90

B.1 General ................................................................................................................. 90

B.1.1 Preamble ..................................................................................................... 90

B.1.2 Scope and object ......................................................................................... 90

B.2 Terms and definitions ............................................................................................ 91

B.2.1 Terms and definitions relating to currents flowing from live parts to

earth .............................................................................................................. 91

B.2.2 Terms and definitions relating to the energization of a CBR .......................... 91

B.2.3 Terms and definitions relating to the operation and the functions of a

CBR ............................................................................................................... 92

B.2.4 Terms and definitions relating to values and ranges of energizing

quantities ....................................................................................................... 93

B.3 Classification ........................................................................................................ 94

B.3.1 Classification according to the method of operation of the residual

current function .............................................................................................. 94

B.3.2 Classification according to the possibility of adjusting the residual

operating current ............................................................................................ 94

B.3.3 Classification according to time-delay of the residual current function ........... 94

B.3.4 Classification according to behaviour in presence of a d.c. component .......... 94

B.4 Characteristics of CBRs concerning their residual current function ......................... 94

B.4.1 Rated values ................................................................................................ 94

B.4.2 Preferred and limiting values ........................................................................ 95

B.4.3 Value of the rated residual short-circuit making and breaking capacity

(I ) ............................................................................................................. 96

B.4.4 Operating characteristics in case of an earth fault current in the

presence or absence of a d.c. component ...................................................... 96

B.5 Marking ................................................................................................................. 96

B.6 Normal service, mounting and transport conditions ................................................ 97

B.7 Design and operating requirements ....................................................................... 98

B.7.1 Design requirements .................................................................................... 98

B.7.2 Operating requirements ................................................................................ 98

B.7.3 Electromagnetic compatibility ..................................................................... 100

B.8 Tests .................................................................................................................. 100

B.8.1 General ...................................................................................................... 100

B.8.2 Verification of the operating characteristic .................................................. 103

B.8.3 Verification of dielectric properties .............................................................. 104

B.8.4 Verification of the operation of the test device at the limits of rated

voltage ......................................................................................................... 105

B.8.5 Verification of the limiting value of the non-operating current under

over-current conditions................................................................................. 105

B.8.6 Verification of the resistance against unwanted tripping due to surge

currents resulting from impulse voltages ...................................................... 106

B.8.7 Verification of the behaviour of CBRs of type A in the case of an earth

fault current comprising a d.c. component .................................................... 107

B.8.8 Verification of the behaviour of CBRs functionally dependent on line

voltage classified under B.3.1.2.1 ................................................................. 108

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IEC 60947-2:2016 © IEC 2016 – 5 –
B.8.9 Verification of the behaviour of CBRs functionally dependent on line

voltage as classified under B.3.1.2.2 in the case of failure of line voltage ...... 109

B.8.10 Verification of the residual short-circuit making and breaking capacity ........ 110

B.8.11 Verification of the effects of environmental conditions ................................. 111

B.8.12 Verification of electromagnetic compatibility ............................................... 111

B.8.13 Test for variations or interruptions of voltage and for voltage dips ............... 113

Annex C (normative) Individual pole short-circuit test sequence ......................................... 120

C.1 General ............................................................................................................... 120

C.2 Test of individual pole short-circuit breaking capacity ........................................... 120

C.3 Verification of dielectric withstand ........................................................................ 120

C.4 Verification of overload releases .......................................................................... 120

Annex D Vacant .................................................................................................................. 121

Annex E (informative) Items subject to agreement between manufacturer and user ............. 122

Annex F (normative) Additional tests for circuit-breakers with electronic over-current

protection ............................................................................................................................ 123

F.1 General ............................................................................................................... 123

F.2 List of tests ......................................................................................................... 123

F.2.1 General ...................................................................................................... 123

F.2.2 Electromagnetic compatibility (EMC) tests .................................................. 123

F.2.3 Suitability for multiple frequencies .............................................................. 124

F.2.4 Dry heat test .............................................................................................. 124

F.2.5 Damp heat test........................................................................................... 124

F.2.6 Temperature variation cycles at a specified rate of change ......................... 124

F.3 General test conditions ........................................................................................ 124

F.3.1 General ...................................................................................................... 124

F.3.2 Electromagnetic compatibility tests ............................................................. 124

F.4 Immunity tests ..................................................................................................... 125

F.4.1 Harmonic currents ...................................................................................... 125

F.4.2 Electrostatic discharges ............................................................................. 126

F.4.3 Radiated RF electromagnetic fields ............................................................ 126

F.4.4 Electrical fast transient/burst (EFT/B) ......................................................... 126

F.4.5 Surges ....................................................................................................... 127

F.4.6 Conducted disturbances induced by RF fields (common mode) ................... 127

F.4.7 Current dips ............................................................................................... 127

F.5 Emission tests ..................................................................................................... 128

F.5.1 Harmonics ................................................................................................. 128

F.5.2 Voltage fluctuations .................................................................................... 128

F.5.3 Conducted RF disturbances (150 kHz to 30 MHz) ....................................... 128

F.5.4 Radiated RF disturbances (30 MHz to 1 GHz) ............................................. 128

F.6 Suitability for multiple frequencies ....................................................................... 129

F.6.1 General ...................................................................................................... 129

F.6.2 Test conditions ........................................................................................... 129

F.6.3 Test procedure ........................................................................................... 129

F.6.4 Test results ................................................................................................ 129

F.7 Dry heat test ....................................................................................................... 129

F.7.1 Test procedure ........................................................................................... 129

F.7.2 Test results ................................................................................................ 130

F.7.3 Verification of overload releases ................................................................. 130

F.8 Damp heat test .................................................................................................... 130

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– 6 – IEC 60947-2:2016 © IEC 2016

F.8.1 Test procedure ........................................................................................... 130

F.8.2 Verification of overload releases ................................................................. 130

F.9 Temperature variation cycles at a specified rate of change .................................. 130

F.9.1 Test conditions ........................................................................................... 130

F.9.2 Test procedure ........................................................................................... 130

F.9.3 Test results ................................................................................................ 131

F.9.4 Verification of overload releases ................................................................. 131

Annex G (normative) Power loss ........................................................................................ 144

G.1 General ............................................................................................................... 144

G.2 Test methods ......................................................................................

...

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