Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – Semiconductor motor controllers, starters and soft-starters

IEC 60947-4-2:2020 applies to semiconductor motor controllers, starters and soft-starters which can include a series mechanical switching device, intended to be connected to circuits the rated voltage of which does not exceed 1 000 V AC.
This fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- scope exclusions;
- editorial correction of notes and hanging paragraphs;
- reference to IEC 62683-1;
- safety aspects related to:
- general aspects;
- limited energy circuits;
- electronic circuits;
- mention of dedicated wiring accessories;
- power consumption measurement;
- alignment to IEC 60947-1:2020.

Appareillage à basse tension - Partie 4-2: Contacteurs et démarreurs de moteurs - Gradateurs, démarreurs et démarreurs progressifs de moteurs à semiconducteurs

L’IEC 60947-4-2:2020 s’applique aux gradateurs, démarreurs et démarreurs progressifs à semiconducteurs de moteurs qui peuvent comprendre un appareil mécanique de connexion en série, destiné à être relié à des circuits dont la tension assignée ne dépasse pas 1 000 V en courant alternatif.
Cette quatrième édition annule et remplace la troisième édition parue en 2011. Cette édition constitue une révision technique.
La présente édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
- exclusions du domaine d’application;
- correction rédactionnelle des notes et des alinéas en suspens;
- référence à l’IEC 62683-1;
- aspects de sécurité relatifs aux points suivants:
- aspects généraux;
- circuits à énergie limitée;
- circuits électroniques;
- mention des accessoires de câblage dédiés;
- mesure de la puissance consommée;
- alignement sur l’IEC 60947-1:2020.
La version française de la norme n’a pas été soumise au vote.

General Information

Status
Published
Publication Date
25-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
26-Jun-2020
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IEC 60947-4-2:2020 - Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – Semiconductor motor controllers, starters and soft-starters
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IEC 60947-4-2
Edition 4.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 4-2: Contactors and motor-starters – Semiconductor motor controllers,
starters and soft-starters
Appareillage à basse tension –
Partie 4-2: Contacteurs et démarreurs de moteurs – Gradateurs, démarreurs et
démarreurs progressifs à semiconducteurs de moteurs
IEC 60947-4-2:2020-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60947-4-2
Edition 4.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 4-2: Contactors and motor-starters – Semiconductor motor controllers,
starters and soft-starters
Appareillage à basse tension –
Partie 4-2: Contacteurs et démarreurs de moteurs – Gradateurs, démarreurs et
démarreurs progressifs à semiconducteurs de moteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-8451-3

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 60947-4-2:2020 © IEC 2020
CONTENTS

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

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

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

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

3 Terms, definitions, symbols and abbreviated terms ........................................................ 12

3.1 Terms and definitions ............................................................................................ 12

3.1.1 Terms and definitions concerning the types of semiconductor motor

controllers and starters ................................................................................. 12

3.1.2 Terms and definitions concerning semiconductor motor controllers and

starters .......................................................................................................... 14

3.1.3 Terms and definitions concerning safety aspects ......................................... 17

3.1.4 Alphabetical index of terms .......................................................................... 18

3.2 Symbols and abbreviated terms ............................................................................ 20

4 Classification ................................................................................................................. 20

5 Characteristics of semiconductor motor controllers and starters .................................... 20

5.1 Summary of characteristics ................................................................................... 20

5.2 Type of equipment ................................................................................................ 21

5.2.1 Kind of equipment ........................................................................................ 21

5.2.2 Number of poles .......................................................................................... 21

5.2.3 Kind of current ............................................................................................. 21

5.2.4 Interrupting medium (air, vacuum, etc.) ........................................................ 21

5.2.5 Operating conditions of the equipment ......................................................... 21

5.3 Rated and limiting values for main circuits ............................................................ 22

5.3.1 Rated voltages ............................................................................................. 22

5.3.2 Currents....................................................................................................... 24

5.3.3 Rated frequency .......................................................................................... 25

5.3.4 Duty cycle values and sequences ................................................................ 25

5.3.5 Normal load and overload characteristics ..................................................... 25

5.3.6 Rated conditional short-circuit current .......................................................... 27

5.3.7 Semiconductor motor controller power losses .............................................. 27

5.4 Utilization category ............................................................................................... 28

5.4.1 General........................................................................................................ 28

5.4.2 Assignment of ratings based on the results of tests ..................................... 28

5.5 Control circuits ...................................................................................................... 29

5.6 Auxiliary circuits .................................................................................................... 29

5.7 Characteristics of relays and releases (overload relays)........................................ 29

5.7.1 Summary of characteristics .......................................................................... 29

5.7.2 Types of relay or release ............................................................................. 30

5.7.3 Characteristic values ................................................................................... 30

5.7.4 Designation and current settings of overload relays ..................................... 31

5.7.5 Time-current characteristics of overload relays ............................................ 31

5.7.6 Influence of ambient air temperature ............................................................ 32

5.8 Coordination with short-circuit protective devices (SCPD) ..................................... 32

6 Product information ....................................................................................................... 32

6.1 Nature of information ............................................................................................ 32

6.2 Marking ................................................................................................................. 34

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IEC 60947-4-2:2020 © IEC 2020 – 3 –
6.3 Instructions for installation, operation, maintenance, decommissioning and

dismantling ........................................................................................................... 34

6.4 Environmental information .................................................................................... 34

7 Normal service, mounting and transport conditions ........................................................ 35

7.1 Normal service conditions ..................................................................................... 35

7.1.1 Ambient air temperature .............................................................................. 35

7.1.2 Altitude ........................................................................................................ 35

7.1.3 Atmospheric conditions ................................................................................ 35

7.1.4 Shock and vibrations.................................................................................... 35

7.2 Conditions during transport and storage ................................................................ 35

7.3 Mounting ............................................................................................................... 35

7.4 Electrical system disturbances and influences ...................................................... 35

8 Constructional and performance requirements ............................................................... 36

8.1 Constructional requirements ................................................................................. 36

8.1.1 General........................................................................................................ 36

8.1.2 Materials ...................................................................................................... 36

8.1.3 Current-carrying parts and their connections ................................................ 37

8.1.4 Clearances and creepage distances ............................................................ 37

8.1.5 Actuator ....................................................................................................... 37

8.1.6 Indication of the contact position .................................................................. 37

8.1.7 Additional requirements for equipment suitable for isolation ......................... 37

8.1.8 Terminals ..................................................................................................... 37

8.1.9 Additional requirements for equipment provided with a neutral pole ............. 38

8.1.10 Provisions for protective earthing ................................................................. 38

8.1.11 Enclosures for equipment ............................................................................ 38

8.1.12 Degrees of protection of enclosed equipment............................................... 38

8.1.13 Conduit pull-out, torque and bending with metallic conduits ......................... 38

8.1.14 Limited energy source .................................................................................. 38

8.1.15 Stored charge energy circuit ........................................................................ 40

8.1.16 Fault and abnormal conditions ..................................................................... 40

8.1.17 Short-circuit and overload protection of ports ............................................... 41

8.2 Performance requirements .................................................................................... 41

8.2.1 Operating conditions .................................................................................... 41

8.2.2 Temperature-rise ......................................................................................... 46

8.2.3 Dielectric properties ..................................................................................... 47

8.2.4 Normal load and overload performance requirements .................................. 48

8.2.5 Coordination with short-circuit protective devices ......................................... 53

8.3 EMC requirements ................................................................................................ 54

8.3.1 General........................................................................................................ 54

8.3.2 Immunity ...................................................................................................... 54

8.3.3 Emission ...................................................................................................... 56

9 Tests ............................................................................................................................. 56

9.1 Kinds of tests ........................................................................................................ 56

9.1.1 General........................................................................................................ 56

9.1.2 Type tests .................................................................................................... 56

9.1.3 Routine tests ............................................................................................... 57

9.1.4 Sampling tests ............................................................................................. 57

9.1.5 Special tests ................................................................................................ 57

9.2 Compliance with constructional requirements ........................................................ 58

---------------------- Page: 5 ----------------------
– 4 – IEC 60947-4-2:2020 © IEC 2020

9.2.1 General........................................................................................................ 58

9.2.2 Electrical performance of screwless-type clamping units .............................. 58

9.2.3 Ageing test for screwless-type clamping units .............................................. 59

9.2.4 Limited energy source test ........................................................................... 59

9.2.5 Breakdown of components ........................................................................... 59

9.2.6 Wire flexing test ........................................................................................... 60

9.3 Compliance with performance requirements .......................................................... 60

9.3.1 Test sequences ........................................................................................... 60

9.3.2 General test conditions ................................................................................ 61

9.3.3 Performance under no load, normal load, and overload conditions ............... 61

9.3.4 Performance under short-circuit conditions .................................................. 72

9.4 EMC tests ............................................................................................................. 75

9.4.1 General........................................................................................................ 75

9.4.2 EMC immunity tests ..................................................................................... 76

9.4.3 EMC emission tests ..................................................................................... 76

9.5 Routine and sampling tests ................................................................................... 79

9.5.1 General........................................................................................................ 79

9.5.2 Operation and operating limits ..................................................................... 79

9.5.3 Dielectric tests ............................................................................................. 79

Annex A (normative) Marking and identification of terminals ................................................ 81

A.1 General ................................................................................................................. 81

A.2 Marking and identification of terminals of semiconductor controllers and

starters ................................................................................................................. 81

A.2.1 Marking and identification of terminals of main circuits ................................. 81

A.2.2 Marking and identification of terminals of control circuits.............................. 81

A.3 Marking and identification of terminals of overload relays ..................................... 81

Annex B (xxx) ....................................................................................................................... 82

Annex C (normative) Coordination at the crossover current between the starter and

associated SCPD .................................................................................................................. 83

C.1 General and definitions ......................................................................................... 83

C.1.1 General........................................................................................................ 83

C.1.2 Terms and definitions .................................................................................. 83

C.2 Condition for the test for the verification of coordination at the crossover

current by a direct method .................................................................................... 83

C.3 Test currents and test circuits ............................................................................... 83

C.4 Test procedure and results to be obtained ............................................................ 84

C.4.1 Test procedure ............................................................................................ 84

C.4.2 Results to be obtained ................................................................................. 84

C.5 Verification of coordination at the crossover current by an indirect method ........... 84

C.5.1 General........................................................................................................ 84

C.5.2 Test for I .................................................................................................. 84

C.5.3 Time-current characteristic withstand capability of controllers/starters ......... 85

Annex D (xxx) ....................................................................................................................... 87

Annex E (xxx) ....................................................................................................................... 88

Annex F (informative) Operating capability ........................................................................... 89

Annex G (informative) Rated operational currents and rated operational powers of

switching devices for electrical motors .................................................................................. 93

G.1 General ................................................................................................................. 93

G.2 Rated operational powers and rated operational currents ...................................... 93

---------------------- Page: 6 ----------------------
IEC 60947-4-2:2020 © IEC 2020 – 5 –

Annex H (xxx) ....................................................................................................................... 97

Annex I (normative) Modified test circuit for short-circuit testing of semiconductor

motor controllers and starters ............................................................................................... 98

Annex J (xxx) ...................................................................................................................... 100

Annex K (xxx) ..................................................................................................................... 101

Annex L (normative) Examples of overvoltage category reduction ...................................... 102

L.1 General ............................................................................................................... 102

L.2 Insulation to the surroundings ............................................................................. 102

L.2.1 Circuits connected directly to the supply mains .......................................... 102

L.2.2 Insulation between circuits ......................................................................... 103

Annex M (xxx) ..................................................................................................................... 107

Annex N (normative) Additional requirements and tests for equipment with protective

separation ........................................................................................................................... 108

N.1 General ............................................................................................................... 108

N.2 Definitions........................................................................................................... 108

N.3 Requirements ..................................................................................................... 108

N.3.1 Test method for implementing protective impedance .................................. 108

N.3.2 Touch current measurement ...................................................................... 109

Bibliography ........................................................................................................................ 111

Figure 1 – Semiconductor motor control devices ................................................................... 13

Figure 2 – Connecting methods ............................................................................................ 24

Figure 3 – Thermal memory test ........................................................................................... 44

Figure 4 – Multiple of current setting limits for ambient air temperature compensated

time-delay overload relays .................................................................................................... 71

Figure C.1 – Examples of time-current withstand characteristic............................................. 86

Figure F.1 – Thermal stability test profile .............................................................................. 90

Figure F.2 – Overload capability test profile .......................................................................... 91

Figure F.3 – Blocking and commutating capability test profile ............................................... 92

Figure I.1 – Modified circuit for short-circuit testing of semiconductor devices ....................... 98

Figure I.2 – Time line for the short-circuit test of 9.3.4.1.6 .................................................... 99

Figure L.1 – Basic insulation evaluation for circuits connected directly to the origin of

the installation mains supply ............................................................................................... 102

Figure L.2 – Basic insulation evaluation for circuits connected directly to the mains

supply ................................................................................................................................. 103

Figure L.3 – Basic insulation evaluation for equipment not permanently connected to

the mains supply ................................................................................................................. 103

Figure L.4 – Basic insulation evaluation for insulation between circuits connected

directly to the origin of the installation mains supply and that are declared galvanically

separated ........................................................................................................................... 104

Figure L.5 – Basic insulation evaluation for insulation between circuits connected

directly to the mains supply and that are declared galvanically separated ........................... 104

Figure L.6 – Basic insulation evaluation for insulation between circuits not permanently

connected directly to the mains supply and that are declared galvanically separated .......... 105

Figure L.7 – Basic insulation evaluation for insulation between circuits connected

directly to the origin of the installation mains supply and that are declared galvanically

separated where internal SPDs are used ............................................................................ 105

---------------------- Page: 7 ----------------------
– 6 – IEC 60947-4-2:2020 © IEC 2020

Figure L.8 – Basic insulation evaluation for insulation between circuits connected

directly to the mains supply and that are declared galvanically separated where

internal SPDs are used ....................................................................................................... 106

Figure L.9 – Basic insulation evaluation for insulation between circuits connected

directly to the mains supply and that are declared galvanically separated ........................... 106

Figure N.1 – Protection by means of protective impedance ................................................. 109

Figure N.2 – Measuring instrument ..................................................................................... 110

Table 1 – Utilization categories ............................................................................................. 28

Table 2 – Relative levels of severity ...................................................................................... 29

Table 3 – Trip classes of overload relays .............................................................................. 31

Table 19 – Limits for limited energy sources without an over-current protective device ......... 39

Table 20 – Limits for limited energy sources with an over-current protective device .............. 39

Table 21 – Limits for limited energy source with current limiting impedance .......................... 40

Table 4 – Limits of operation of time-delay overload relay
...

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