Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - Semiconductor controllers and semiconductor contactors for non-motor loads

IEC 60947-4-3:2020(E) applies to semiconductor controllers and semiconductor contactors for non-motor load intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V AC.
It covers their use:
– for operations of changing the state of AC electric circuits between the ON-state and the OFF-state;
– with or without bypass switching devices;
– as controller, for reducing the amplitude of the RMS AC voltage.
This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) scope exclusions;
b) editorial correction of notes and hanging paragraphs;
c) safety aspects related to:
- general aspects;
- limited energy circuits;
- electronic circuits;
d) mention of dedicated wiring accessories;
e) power consumption measurement;
f) alignment to IEC 60947-1:2020;
g) alignment with IEC 60947-4-2 when appropriate.

General Information

Status
Published
Publication Date
13-Jul-2020
Current Stage
PPUB - Publication issued
Completion Date
14-Jul-2020
Ref Project

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IEC 60947-4-3:2020 - Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - Semiconductor controllers and semiconductor contactors for non-motor loads
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IEC 60947-4-3
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear –
Part 4-3: Contactors and motor-starters – Semiconductor controllers and
semiconductor contactors for non-motor loads
IEC 60947-4-3:2020-07(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60947-4-3
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear –
Part 4-3: Contactors and motor-starters – Semiconductor controllers and
semiconductor contactors for non-motor loads
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20; 31.180 ISBN 978-2-8322-8550-3

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 60947-4-3:2020 © IEC 2020
CONTENTS

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

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

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

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

3 Terms, definitions, symbols and abbreviated terms ........................................................ 11

3.1 General ................................................................................................................. 11

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

3.3 Terms and definitions concerning the types of semiconductor controllers and

semiconductor contactors (see Figure 1)............................................................... 12

3.4 Terms and definitions concerning characteristics of semiconductor

controllers and semiconductor contactors ............................................................. 13

3.5 Terms and definitions concerning safety aspects .................................................. 16

3.6 Symbols and abbreviated terms ............................................................................ 16

4 Classification ................................................................................................................. 17

5 Characteristics of semiconductor controllers and semiconductor contactors .................. 17

5.1 Summary of characteristics ................................................................................... 17

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

5.2.1 Kind of equipment ........................................................................................ 17

5.2.2 Number of poles .......................................................................................... 18

5.2.3 Kind of current ............................................................................................. 18

5.2.4 Interrupting medium (air, vacuum, etc.) ........................................................ 18

5.2.5 Operating conditions of the equipment ......................................................... 18

5.3 Rated and limiting values for main circuits ............................................................ 20

5.3.1 Rated voltages ............................................................................................. 20

5.3.2 Currents....................................................................................................... 20

5.3.3 Rated frequency .......................................................................................... 20

5.3.4 Duty cycle values and symbols .................................................................... 20

5.3.5 Normal load and overload characteristics ..................................................... 21

5.3.6 Rated conditional short-circuit current .......................................................... 21

5.3.7 Controller power losses ............................................................................... 22

5.4 Utilization category ............................................................................................... 22

5.4.1 General........................................................................................................ 22

5.4.2 Assignment of ratings based on the results of tests ..................................... 23

5.5 Control circuits ...................................................................................................... 23

5.6 Auxiliary circuits .................................................................................................... 23

5.7 Vacant .................................................................................................................. 24

5.8 Coordination with short-circuit protective devices (SCPD) ..................................... 24

6 Product information ....................................................................................................... 24

6.1 Nature of information ............................................................................................ 24

6.2 Marking ................................................................................................................. 25

6.3 Instructions for installation, operation, maintenance, decommissioning and

dismantling ........................................................................................................... 26

6.4 Environmental information .................................................................................... 26

7 Normal service, mounting and transport conditions ........................................................ 26

7.1 Normal service conditions ..................................................................................... 26

7.1.1 Ambient air temperature .............................................................................. 26

7.1.2 Altitude ........................................................................................................ 27

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IEC 60947-4-3:2020 © IEC 2020 – 3 –

7.1.3 Atmospheric conditions ................................................................................ 27

7.1.4 Shock and vibrations.................................................................................... 27

7.2 Conditions during transport and storage ................................................................ 27

7.3 Mounting ............................................................................................................... 27

7.4 Electrical system disturbances and influences ...................................................... 27

8 Constructional and performance requirements ............................................................... 28

8.1 Constructional requirements ................................................................................. 28

8.1.1 General........................................................................................................ 28

8.1.2 Materials ...................................................................................................... 28

8.1.3 Current-carrying parts and their connections ................................................ 29

8.1.4 Clearances and creepage distances ............................................................ 29

8.1.5 Actuator ....................................................................................................... 29

8.1.6 Indication of the contact position .................................................................. 29

8.1.7 Additional requirements for equipment suitable for isolation ......................... 29

8.1.8 Terminals ..................................................................................................... 29

8.1.9 Additional requirements for equipment provided with a neutral pole ............. 30

8.1.10 Provisions for protective earthing ................................................................. 30

8.1.11 Enclosures for equipment ............................................................................ 30

8.1.12 Degrees of protection of enclosed equipment............................................... 30

8.1.13 Conduit pull-out, torque and bending with metallic conduits ......................... 30

8.1.14 Limited energy source .................................................................................. 30

8.1.15 Stored charge energy circuit ........................................................................ 32

8.1.16 Fault and abnormal conditions ..................................................................... 32

8.1.17 Short-circuit and overload protection of ports ............................................... 33

8.2 Performance requirements .................................................................................... 33

8.2.1 Operating conditions .................................................................................... 33

8.2.2 Temperature-rise ......................................................................................... 34

8.2.3 Dielectric properties ..................................................................................... 35

8.2.4 Normal load and overload performance requirements .................................. 36

8.2.5 Coordination with short-circuit protective devices ......................................... 41

8.3 EMC requirements ................................................................................................ 41

8.3.1 General........................................................................................................ 41

8.3.2 Immunity ...................................................................................................... 41

8.3.3 Emission ...................................................................................................... 43

9 Tests ............................................................................................................................. 43

9.1 Kinds of tests ........................................................................................................ 43

9.1.1 General........................................................................................................ 43

9.1.2 Type tests .................................................................................................... 43

9.1.3 Routine tests ............................................................................................... 44

9.1.4 Sampling tests ............................................................................................. 44

9.1.5 Special tests ................................................................................................ 44

9.2 Compliance with constructional requirements ........................................................ 45

9.2.1 General........................................................................................................ 45

9.2.2 Electrical performance of screwless-type clamping units .............................. 45

9.2.3 Ageing test for screwless-type clamping units .............................................. 45

9.2.4 Limited energy source test ........................................................................... 45

9.2.5 Breakdown of components ........................................................................... 46

9.2.6 Wire flexing test ........................................................................................... 47

9.3 Compliance with performance requirements .......................................................... 47

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– 4 – IEC 60947-4-3:2020 © IEC 2020

9.3.1 Test sequences ........................................................................................... 47

9.3.2 General test conditions ................................................................................ 48

9.3.3 Performance under no load, normal load and overload conditions ................ 48

9.3.4 Performance under short-circuit conditions .................................................. 56

9.4 EMC tests ............................................................................................................. 59

9.4.1 General........................................................................................................ 59

9.4.2 EMC immunity tests ..................................................................................... 60

9.4.3 EMC emission tests ..................................................................................... 61

9.5 Routine and sampling tests ................................................................................... 63

9.5.1 General........................................................................................................ 63

9.5.2 Operation and operating limits ..................................................................... 63

9.5.3 Dielectric tests ............................................................................................. 63

Annex A (normative) Marking and identification of terminals ................................................ 65

A.1 General ................................................................................................................. 65

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

semiconductor contactors ..................................................................................... 65

A.2.1 Marking and identification of terminals of main circuits ................................. 65

A.2.2 Marking and identification of terminals of control circuits.............................. 65

Annex B (informative) Typical service conditions for semiconductor controllers and

semiconductor contactors ..................................................................................................... 66

B.1 Control of resistive heating elements .................................................................... 66

B.2 Switching of electric discharge lamp controls ........................................................ 66

B.3 Switching of incandescent lamps .......................................................................... 66

B.4 Switching of transformers...................................................................................... 67

B.5 Switching of capacitor banks ................................................................................. 67

Annex C Vacant .................................................................................................................... 68

Annex D Vacant .................................................................................................................... 69

Annex E Vacant .................................................................................................................... 70

Annex F (informative) Operating capability ........................................................................... 71

Annex G Vacant .................................................................................................................... 74

Annex H Vacant .................................................................................................................... 75

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

contactors and semiconductor controllers ............................................................................. 76

Annex J (informative) Vacant ............................................................................................... 78

Annex K (normative) Examples of overvoltage category reduction ....................................... 79

K.1 General ................................................................................................................. 79

K.2 Insulation to the surroundings ............................................................................... 79

K.2.1 Circuits connected directly to the supply mains ............................................ 79

K.2.2 Insulation between circuits ........................................................................... 80

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

separation ............................................................................................................................. 84

L.1 General ................................................................................................................. 84

L.2 Terms and definitions ............................................................................................ 84

L.3 Requirements ....................................................................................................... 84

L.3.1 Test method for implementing protective impedance .................................... 84

L.3.2 Touch current measurement ........................................................................ 85

Bibliography .......................................................................................................................... 87

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IEC 60947-4-3:2020 © IEC 2020 – 5 –

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

Figure 2 – Methods of connecting ......................................................................................... 19

Figure F.1 – Thermal stability test profile .............................................................................. 71

Figure F.2 – Overload withstand test profile .......................................................................... 72

Figure F.3 – Blocking and commutating capability test profile ............................................... 73

Figure I.1 – Modified circuit for short-circuit testing of semiconductor devices ....................... 76

Figure I.2 – Timeline for the short-circuit test of 9.3.4.1.6 ..................................................... 77

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

the installation mains supply ................................................................................................. 79

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

supply ................................................................................................................................... 80

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

the mains supply ................................................................................................................... 80

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

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

separated ............................................................................................................................. 81

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

directly to the mains supply and that are declared galvanically separated ............................. 81

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

connected directly to the mains supply and that are declared galvanically separated ............ 82

Figure K.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 .............................................................................. 82

Figure K.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 ......................................................................................................... 83

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

directly to the mains supply and that are declared galvanically separated ............................. 83

Figure L.1 – Protection by means of protective impedance.................................................... 85

Figure L.2 – Measuring instrument ........................................................................................ 86

Table 1 – Utilization categories ............................................................................................. 23

Table 2 – Relative levels of severity ...................................................................................... 23

Table 14 – Limits for limited energy sources without an over-current protective device ......... 31

Table 15 – Limits for limited energy sources with an over-current protective device .............. 31

Table 16 – Limits for limited energy source with current limiting impedance .......................... 32

Table 3 – Temperature-rise limits for insulated coils in air and in oil ..................................... 35

Table 4 – Minimum overload current withstand time (T ) in relation to overload current

ratio (X) ................................................................................................................................ 37

Table 5 – Minimum requirements for thermal stability test conditions .................................... 37

Table 6 – Minimum requirements for overload current withstand test conditions .................... 38

Table 7 – Making and breaking capacity test – Making and breaking conditions

according to utilization categories for the mechanical switching device ................................. 39

Table 8 – Conventional operational performance – Making and breaking conditions

according to utilization categories for the mechanical switching device ................................. 40

Table 9 – Specific performance criteria when EM disturbances are present .......................... 42

Table 10 – Thermal stability test specifications ..................................................................... 52

Table 11 – Blocking and commutating capability test specifications ...................................... 54

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– 6 – IEC 60947-4-3:2020 © IEC 2020

Table 12 – Terminal disturbance voltage limits for conducted radio-frequency emission

(AC mains power port) .......................................................................................................... 62

Table 13 – Radiated emissions test limits ............................................................................. 63

Table A.1 – Main circuit terminal markings ............................................................................ 65

Table K.1 – Drawing keys ..................................................................................................... 79

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IEC 60947-4-3:2020 © IEC 2020 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 4-3: Contactors and motor-starters –
Semiconductor controllers and semiconductor
contactors for non-motor loads
FOREWORD

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International Standard IEC 60947-4-3 has been prepared by subcommittee 121A: Low-voltage

switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and

their assemblies for low-voltage.

This third edition cancels and replaces the second edition published in 2014. This edition

constitutes a technica
...

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