EN IEC 60947-4-3:2024
(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.
Niederspannungsschaltgeräte - Teil 4-3: Schütze und Motorstarter - Halbleiter-Steuergeräte und Halbleiter-Schütze für nichtmotorische Lasten
Appareillage à basse tension - Partie 4-3: Contacteurs et démarreurs de moteurs - Gradateurs et contacteurs à semiconducteurs pour charges autres non moteurs
L'IEC 60947-4-3:2020 s’applique aux gradateurs à semiconducteurs et aux contacteurs à semiconducteurs pour des charges non moteurs, destinés à être reliés à des circuits dont la tension assignée ne dépasse pas 1 000 V en courant alternatif. Il couvre leur utilisation: - pour les opérations consistant à commuter l’état des circuits électriques en courant alternatif entre l’état passant et l’état bloqué; - avec ou sans appareil de connexion de contournement; - en tant que gradateur, visant à réduire l’amplitude de la tension alternative en valeur efficace. Cette troisième édition annule et remplace la deuxième édition parue en 2014. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) mention d’exclusions dans le domaine d’application; b) correction rédactionnelle des notes et des alinéas en suspens; c) aspects de sécurité relatifs aux points suivants: - aspects généraux; - circuits à énergie limitée; - circuits électroniques; d) mention des accessoires de câblage spécifiques; e) mesure de la puissance consommée; f) alignement sur l’IEC 60947-1:2020; g) alignement sur l’IEC 60947-4-2, le cas échéant. La présente version bilingue (2025-02) correspond à la version anglaise monolingue publiée en 2020-07. La version française de cette norme n'a pas été soumise au vote.
Nizkonapetostne stikalne in krmilne naprave - 4-3. del: Kontaktorji in motorski zaganjalniki - Polprevodniški krmilniki in polprevodniški kontaktorji na izmenični tok za nemotorske obremenitve (IEC 60947-4-3:2020)
Ta dokument se uporablja za polprevodniške krmilnike in polprevodniške kontaktorje na izmenični tok za nemotorske obremenitve, ki so namenjeni priključitvi na tokokroge z nazivno izmenično napetostjo, ki ne presega 1000 V.
Obravnava njihovo uporabo:
– za operacije s spreminjanjem stanja izmeničnih električnih tokokrogov med stanjem vklopa in izklopa;
– z obvodnimi stikalnimi napravami ali brez njih;
– kot krmilnik za zmanjšanje amplitude efektivne izmenične napetosti.
Ta dokument se ne uporablja za:
– elektromehanske kontaktorje (glej standard IEC 60947-4-1);
– napravo za zaščito pred kratkim stikom, ki je povezana s polprevodniškimi krmilniki in polprevodniškimi kontaktorji (glej standarde IEC 60947-4-1 (MPSD), IEC 60947-2 in IEC 60947-3);
– opremo polprevodniških krmilnikov motorjev ali mehkih zaganjalnikov na izmenični tok (glej standard IEC 60947-4-2);
– polprevodniške pretvornike (glej standard IEC 60146 (vsi deli));
– polprevodniške releje (glej standard IEC 62314);
– uporabo izdelka v eksplozivnih atmosferah (glej standard IEC 60079 (vsi deli));
– zahteve za programsko in vdelano programsko opremo (glej standard IEC TR 63201);
– vidike kibernetske varnosti (glej standard IEC TS 63208).
Kontaktorji in naprave s krmilnimi tokokrogi, ki se uporabljajo v polprevodniških krmilnikih in kontaktorjih na izmenični tok, morajo izpolnjevati zahteve ustreznega standarda za proizvod. Kadar se uporabljajo mehanske stikalne naprave, se šteje, da izpolnjujejo zahteve svojega standarda za izdelek IEC in dodatne zahteve tega dokumenta.
Cilj tega dokumenta je navesti:
– lastnosti polprevodniških krmilnikov in polprevodniških kontaktorjev;
– pogoje, ki jih morajo izpolnjevati polprevodniški krmilniki in polprevodniški kontaktorji v zvezi z naslednjim:
a) njihovim delovanjem in obnašanjem v normalnih in nenormalnim delovnih razmerah, vključno z delovanjem pri presežnem toku;
b) njihovimi dielektričnimi lastnostmi;
c) stopnjami zaščite, doseženimi z okrovi, kjer je primerno;
d) njihovo konstrukcijo, vključno z zaščito pred električnim udarom, požarno ogroženostjo in mehaničnim tveganjem;
– preskuse, katerih cilj je potrditi, da so bili ti pogoji in metode izvajanja teh preskusov izpolnjeni;
– informacije, ki jih je treba predložiti z opremo ali navesti v navodilih proizvajalca.
General Information
Relations
Overview
EN IEC 60947-4-3:2024 (identical to IEC 60947-4-3:2020) is the third-edition standard for low-voltage switchgear and controlgear that defines requirements for semiconductor controllers and semiconductor contactors for non-motor loads. It applies to equipment intended for connection to AC circuits with a rated voltage up to 1 000 V AC and covers devices used to switch AC circuits ON/OFF, with or without bypass switching, and devices used as controllers to reduce the RMS AC voltage amplitude.
This edition cancels and replaces the 2014 edition and constitutes a technical revision with several significant updates (scope exclusions, editorial corrections, enhanced safety aspects, wiring accessory references, power consumption measurement, and alignment to IEC 60947-1:2020 and IEC 60947-4-2 where appropriate).
Key topics and technical requirements
- Scope and application: Definition of intended use for semiconductor controllers/contactors for non-motor loads up to 1 000 V AC.
- Classification and characteristics: Type of equipment, number of poles, kind of current, interrupting medium, duty cycles, rated voltages and currents, overload characteristics and limiting values.
- Constructional and performance requirements: Materials, mechanical and electrical design criteria to ensure reliable switching and controller operation.
- Safety aspects: Updated provisions for general safety, limited energy circuits and electronic circuit protections.
- Control and auxiliary circuits: Requirements for control interfaces and auxiliary functions.
- Coordination with protective devices: Guidance for interaction with short-circuit protective devices (SCPD) and system coordination.
- Product information and marking: Mandatory marking, installation/maintenance instructions and environmental information.
- EMC and conformity: Includes references and mapping (Annex ZZ) to Directive 2014/30/EU for electromagnetic compatibility where applicable.
Practical applications and users
This standard is essential for:
- Manufacturers and designers of semiconductor contactors and controllers for lighting, heating, resistive or other non-motor loads.
- Test laboratories and certification bodies verifying compliance with low-voltage switchgear requirements.
- Electrical system integrators, specifiers and panel builders selecting switching devices up to 1 000 V AC.
- Regulatory and compliance teams implementing harmonised standards for EMC and safety.
Practical uses include specifying device ratings, ensuring safe installation and interchangeability, verifying EMC performance and coordinating devices with protective equipment.
Related standards
Relevant cross-references include:
- IEC 60947-1:2020 (general rules for low-voltage switchgear)
- IEC 60947-4-2 (where alignment is appropriate)
- EMC and testing standards cited in the normative references (IEC 61000 series, CISPR 11, IEC 60445, etc.)
Keywords: EN IEC 60947-4-3:2024, IEC 60947-4-3, low-voltage switchgear and controlgear, semiconductor controllers, semiconductor contactors, non-motor loads, 1 000 V AC, bypass switching, RMS voltage reduction, EMC.
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2025
Nizkonapetostne stikalne in krmilne naprave - 4-3. del: Kontaktorji in motorski
zaganjalniki - Polprevodniški krmilniki in polprevodniški kontaktorji na izmenični
tok za nemotorske obremenitve (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 (IEC
60947-4-3:2020)
Niederspannungsschaltgeräte - Teil 4-3: Schütze und Motorstarter - Halbleiter-
Steuergeräte und -Schütze für nicht motorische Lasten für Wechselspannung (IEC
60947-4-3:2020)
Appareillage à basse tension - Partie 4-3: Contacteurs et démarreurs de moteurs -
Gradateurs à semiconducteurs et contacteurs à semiconducteurs pour charges autres
que des moteurs (IEC 60947-4-3:2020)
Ta slovenski standard je istoveten z: EN IEC 60947-4-3:2024
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60947-4-3
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2024
ICS 29.130.20; 31.180 Supersedes EN 60947-4-3:2014
English Version
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)
Appareillage à basse tension - Partie 4-3: Contacteurs et Niederspannungsschaltgeräte - Teil 4-3: Schütze und
démarreurs de moteurs - Gradateurs et contacteurs à Motorstarter - Halbleiter-Steuergeräte und Halbleiter-
semiconducteurs pour charges autres non moteurs Schütze für nichtmotorische Lasten
(IEC 60947-4-3:2020) (IEC 60947-4-3:2020)
This European Standard was approved by CENELEC on 2024-10-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-4-3:2024 E
European foreword
The text of document 121A/357/FDIS, future edition 3 of IEC 60947-4-3, prepared by SC 121A "Low-
voltage switchgear and controlgear" of IEC/TC 121 "Switchgear and controlgear and their assemblies
for low voltage" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which this document has (dop) 2025-12-31
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2027-12-31
standards conflicting with this document
have to be withdrawn
This document supersedes EN 60947-4-3:2014 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
For the relationship with EU Legislation, see informative Annex ZZ, which is an integral part of this
document.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60947-4-3:2020 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60068-2-2:2007 NOTE Approved as EN 60068-2-2:2007 (not modified)
IEC 60079 (series) NOTE Approved as EN IEC 60079-7:2015/A1 (series)
IEC 60085 NOTE Approved as EN 60085
IEC 60146 (series) NOTE Approved as EN 60146 (series)
IEC 60269-1:2006 NOTE Approved as EN 60269-1:2007 (not modified)
IEC 60269-1:2006/A1:2009 NOTE Approved as EN 60269-1:2007/A1:2009 (not modified)
IEC 60269-1:2006/A2:2014 NOTE Approved as EN 60269-1:2007/A2:2014 (not modified)
IEC 60364-1 NOTE Approved as HD 60364-1
IEC 60664 (series) NOTE Approved as EN 60664 (series)
IEC 60947-2 NOTE Approved as EN 60947-2
IEC 60947-3 NOTE Approved as EN IEC 60947-3
IEC 60947-4-2 NOTE Approved as EN IEC 60947-4-2
IEC 60990:2016 NOTE Approved as EN 60990:2016 (not modified)
IEC 61000-4 (series) NOTE Approved as EN 61000-4 (series)
IEC 61032 NOTE Approved as EN 61032
IEC 61439 (series) NOTE Approved as EN IEC 61439 (series)
IEC 62314 NOTE Approved as EN 62314
IEC 62477-1:2012 NOTE Approved as EN 62477-1:2012 (not modified) + A11:2014
IEC 62477-1:2012/A1:2016 NOTE Approved as EN 62477-1:2012/A1:2017 (not modified)
IEC/TR 63201 NOTE Approved as CLC IEC/TR 63201
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60445 - Basic and safety principles for man-machine EN IEC 60445 2021
interface, marking and identification -
Identification of equipment terminals,
conductor terminations and conductors
IEC 60715 - Dimensions of low-voltage switchgear and EN 60715 2017
controlgear - Standardized mounting on rails
for mechanical support of switchgear,
controlgear and accessories
IEC 60730-1 (mod) - Automatic electrical controls - Part 1: General EN 60730-1 2016
requirements
+ A1 2019
IEC 60947-1 2020 Low-voltage switchgear and controlgear - EN 60947-1 2020
Part 1: General rules
IEC 60947-4-1 - Low-voltage switchgear and controlgear - EN IEC 60947-4-1 2019
Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-
starters
IEC 61000-3-2 - Electromagnetic compatibility (EMC) - Part 3- EN IEC 61000-3-2 2019
2: Limits - Limits for harmonic current
emissions (equipment input current <= 16 A
per phase)
IEC 61000-3-3 - Electromagnetic compatibility (EMC) - Part 3- EN 61000-3-3 2013
3: Limits - Limitation of voltage changes,
voltage fluctuations and flicker in public low-
voltage supply systems, for equipment with
rated current <= 16 A per phase and not
subject to conditional connection
+ A1 2019
Publication Year Title EN/HD Year
IEC 61000-3-11 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-3-11 2019
3-11: Limits - Limitation of voltage changes,
voltage fluctuations and flicker in public low-
voltage supply systems - Equipment with
rated current <= 75 A and subject to
conditional connection
IEC 61000-3-12 - Electromagnetic compatibility (EMC) - Part 3- EN 61000-3-12 2011
12: Limits - Limits for harmonic currents
produced by equipment connected to public
low-voltage systems with input current > 16 A
and < or = 75 A per phase
IEC 61000-4-5 - Electromagnetic compatibility (EMC) – Part EN 61000-4-5 2014
4-5: Testing and measurement techniques –
Surge immunity test
+ A1 2017
IEC 61140 2016 Protection against electric shock - Common EN 61140 2016
aspects for installation and equipment
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment - EN 55011 2016
Radio-frequency disturbance characteristics -
Limits and methods of measurement
+ A1 2016 + A1 2017
ISO 2859-1 1999 Sampling procedures for inspection by - -
attributes - Part 1: Sampling schemes
indexed by acceptance quality limit (AQL) for
lot-by-lot inspection
+ A1 2011 - -
Annex ZZ
(informative)
Relationship between this European standard and the essential
requirements of Directive 2014/30/EU [2014 OJ L96] aimed to be
covered
This European standard has been prepared under a Commission’s standardisation request as regards
harmonised standards in support of Directive 2014/30/EU relating to electromagnetic compatibility,
‘M/552’ / C(2016) 7641 final of 30.11.2016 , to provide one voluntary means of conforming to essential
requirements of Directive 2014/30/EU of the European Parliament and of the Council of 26 February
2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
[2014 OJ L96].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.
Table ZZ.1 — Correspondence between this European standard and Annex I of Directive
2014/30/EU [2014 OJ L96]
Clause(s) / sub-clause(s)
Essential requirements of
Remarks / Notes
Directive 2014/30/EU
of this EN
Annex I. 1(a) (electromagnetic 8.3.1, 8.3.3, 9.4.1, 9.4.3
disturbances)
Annex I. 1(b) (electromagnetic 8.3.1, 8.3.2, 9.4.1, 9.4.2
immunity)
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
COMMISSION IMPLEMENTING DECISION C(2016) 7641 final of 30.11.2016 on a standardisation request to
the European Committee for Standardisation, to the European Committee for Electrotechnical Standardisation
and to the European Telecommunications Standards Institute as regards harmonised standards in support of
Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of
the laws of the Member States relating to electromagnetic compatibility.
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
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
– 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
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
x
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
– 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
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
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
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 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;
– 8 – IEC 60947-4-3:2020 © IEC 2020
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.
The provisions of the general rules dealt with IEC 60947-1 are applicable to this part of
IEC 60947 series where specifically called for. Clauses and subclauses, tables, figures and
annexes of the general rules thus applicable are identified by reference to IEC 60947-1:2020.
The text of this document is based on the following documents:
FDIS Report on voting
121A/357/FDIS 121A/368/RVD
Full information on the voting for the approval of this document can be found in the report on
voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60947 series, published under the general title Low-voltage
switchgear and controlgear, can be found on the IEC website.
The following differing practices of a less permanent nature exist in the countries indicated
below.
5.5 USA and Canada
8.1.14.1 Canada
Table 14 USA
Table 15 USA
9.4.3.2 USA
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IEC 60947-4-3:2020 © IEC 2020 – 9 –
INTRODUCTION
This document covers low-voltage semiconductor controllers and semiconductor contactors
(solid-state contactors) intended for the use with non-motor loads. As semiconductor
controllers, they have many capabilities beyond the simple switching on and off of non-motor
loads. As semiconductor contactors, they perform the same functions as mechanical
contactors, but utilize one or more semiconductor switching devices in their main poles.
The devices may be single-pole or multi-pole (see 3.5.1 of IEC 60947-1:2020). This document
refers to complete devices rated as a unit incorporating all necessary heat-sinking material
and terminals. It includes devices with all necessary terminals, which are supplied with or
without heat-sink in knocked-down form for combination by the users, when the manufacturer
gives with the device detailed information about choosing the heat-sink and mounting the
device on the heat-sink.
– 10 – IEC 60947-4-3:2020 © IEC 2020
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 4-3: Contactors and motor-starters –
Semiconductor controllers and semiconductor
contactors for non-motor loads
1 Scope
This document 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 document does not apply to:
– electromechanical contactors (see IEC 60947-4-1);
– short-circuit protective device associated with semiconductor controllers and
semiconductor contactors (see IEC 60947-4-1 (MPSD), IEC 60947-2 and IEC 60947-3);
– semiconductor motor controller or soft-starter equipment (see IEC 60947-4-2);
– semiconductor converters (see IEC 60146 (all parts));
– solid-state relays (see IEC 62314);
– use of the product within explosive atmospheres (see IEC 60079 (all parts));
– software and firmware requirements (see IEC TR 63201);
– cyber security aspects (see IEC TS 63208).
Contactors and control-circuit devices used in semiconductor controllers and contactors are
considered compliant with the requirements of their relevant product standard. Where
mechanical switching devices are used, they are considered meeting the requirements of their
own IEC product standard and the additional requirements of this document.
The object of this document is to state as follows:
– the characteristics of semiconductor controllers and semiconductor contactors;
– the conditions with which semiconductor controllers and semiconductor contactors comply
with reference to:
a) their operation and behaviour in normal and abnormal operating conditi
...
Frequently Asked Questions
EN IEC 60947-4-3:2024 is a standard published by CLC. Its full title is "Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - Semiconductor controllers and semiconductor contactors for non-motor loads". This standard covers: 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.
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.
EN IEC 60947-4-3:2024 is classified under the following ICS (International Classification for Standards) categories: 29.130.20 - Low voltage switchgear and controlgear; 31.180 - Printed circuits and boards. The ICS classification helps identify the subject area and facilitates finding related standards.
EN IEC 60947-4-3:2024 has the following relationships with other standards: It is inter standard links to EN 60947-4-3:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN IEC 60947-4-3:2024 is associated with the following European legislation: EU Directives/Regulations: 2014/30/EU, 2014/35/EU; Standardization Mandates: M/511, M/552. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN IEC 60947-4-3:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
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