IEC 60947-4-3:2020
(Main)Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - Semiconductor controllers and semiconductor contactors for non-motor loads
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.
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Standards Content (Sample)
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
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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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20; 31.180 ISBN 978-2-8322-8550-3
– 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
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
– 4 – IEC 60947-4-3:2020 © IEC 2020
9.3.1 Test sequences . 47
9.3.2 General test conditions . 48
...
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