SIST EN 60947-4-3:2014
(Amendment)Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC semiconductor controllers and contactors for non-motor loads
Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC semiconductor controllers and contactors for non-motor loads
IEC 60947-4-3:2014 applies to a.c. semiconductor non-motor load controllers and contactors intended for performing electrical operations by changing the state of a.c. electric circuits between the ON-state and the OFF-state. Typical applications are classified by utilization categories given in Table 2. This second edition cancels and replaces the first edition published in 1999, Amendment 1:2006 and Amendment 2:2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Update of the marking requirements (6.1);
b) Update of the EMC requirements (8.3.2); and
c) Update of the tests requirements (9.3.1, 9.4, 9.4.1.1, 9.4.1.2, 9.4.2.1, 9.4.2.2, 9.4.2.3, 9.4.2.4, 9.4.2.6).
Niederspannungsschaltgeräte - Teil 4-3: Schütze und Motorstarter - Halbleiter-Steuergeräte und -Schütze für nichtmotorische Lasten für Wechselspannung
Appareillage à basse tension - Partie 4-3: Contacteurs et démarreurs de moteurs - Gradateurs et contacteurs à semiconducteurs pour charges, autres que des moteurs, à courant alternatif
L'IEC 60947-4-3:2014 s'applique aux gradateurs et démarreurs à semiconducteurs à courant alternatif pour des charges autres que des moteurs prévus pour effectuer des man uvres électriques en changeant l'état des circuits électriques à courant alternatif entre l'état passant et l'état bloqué. Des applications typiques classées par catégorie d'emploi sont données au Tableau 2. Cette deuxième édition annule et remplace la première édition parue en 1999, l'Amendement 1:2006 et l'Amendement 2:2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) mise à jour des exigences de marquage (6.1);
b) mise à jour des exigences de CEM (8.3.2); et
c) mise à jour des exigences d'essais (9.3.1, 9.4, 9.4.1.1, 9.4.1.2, 9.4.2.1, 9.4.2.2, 9.4.2.3, 9.4.2.4, 9.4.2.6).
Nizkonapetostne stikalne in krmilne naprave - 4-3. del: Kontaktorji in motorski zaganjalniki, polprevodniški krmilniki in kontaktorji na izmenični tok za nemotorske obremenitve (IEC 60947-4-3:2014)
Standard EN IEC 60947-4-3 se uporablja za polprevodniške krmilnike in kontaktorje na izmenični tok za nemotorske obremenitve, namenjene izvajanju električnih operacij s spreminjanjem stanja izmeničnih električnih tokokrogov med stanjem vključenosti in izključenosti. Običajne uporabe se razvrščajo po kategorijah uporabe iz tabele 2. Kot krmilniki se lahko uporabljajo za zmanjšanje amplitude efektivne izmenične napetosti na bremenskih spojkah glede na amplitudo uporabljene napetosti, in sicer trajno ali za določeno obdobje. Obdobje polovičnega vala izmenične valovne oblike ostaja nespremenjeno glede na obdobje uporabljene napetosti. Vključujejo lahko serijsko mehansko stikalno napravo in so namenjeni priključku na tokokroge z naznačeno izmenično napetostjo, ki ne presega 1000 V. Ta standard opisuje krmilnike in kontaktorje za uporabo z obvodnimi stikalnimi napravami ali brez njih. Polprevodniški krmilniki in kontaktorji, obravnavani v tem standardu, običajno niso namenjeni prekinitvi kratkostičnih tokov. Zato naj bi bila ustrezna zaščita pred kratkim stikom (glej točko 8.2.5) del inštalacije, vendar ne nujno tudi del samega krmilnika. V tem okviru ta standard določa zahteve za polprevodniške krmilnike in kontaktorje, povezane z ločenimi napravami za zaščito pred kratkim stikom.
General Information
Relations
Overview
EN 60947-4-3:2014 (adoption of IEC 60947-4-3:2014) is the European standard for low-voltage switchgear and controlgear covering AC semiconductor controllers and contactors for non-motor loads (often called solid-state contactors or hybrid controllers). It defines scope, classification, construction, performance and test requirements for devices that switch a.c. circuits between ON and OFF for non-motor applications. This second edition is a technical revision that supersedes the 2000 edition and its amendments.
Key topics and technical requirements
This standard addresses the full product lifecycle from specification to testing and includes:
- Scope and classification - definitions for AC semiconductor controllers, hybrid controllers and utilization categories (see Table 2 for typical applications).
- Rated and limiting values - rated voltages, currents, frequency, duty and coordination with short-circuit protective devices (SCPD).
- Constructional requirements - materials, clearances/creepage distances, terminals, earthing provisions and enclosures suitable for low-voltage installations.
- Performance requirements - temperature rise, dielectric properties, normal-load and overload behaviour, and coordination with SCPDs.
- EMC (electromagnetic compatibility) - emission and immunity requirements (updated in this edition) to ensure devices don’t cause or suffer unacceptable interference.
- Product information and marking - mandatory marking and instruction requirements for safe installation, operation and maintenance (marking rules updated).
- Tests - type, routine, sampling and special tests with specific test sequences and conditions; this edition updates multiple test clauses to reflect modern performance expectations.
Applications and who uses this standard
EN 60947-4-3 is used by:
- Manufacturers and OEMs designing and producing AC semiconductor controllers, solid‑state contactors and hybrid contactors for non‑motor loads.
- Test laboratories and conformity assessors performing type tests, EMC and dielectric testing.
- System integrators, panel builders and electrical specifiers selecting switching devices for heating, lighting and other non-motor a.c. loads.
- Purchasing and compliance teams ensuring products meet European directives (e.g., EMC directive) and have appropriate marking and documentation.
Practical uses include switching of resistive heating elements, lighting banks, power control in industrial processes and other non-motor a.c. loads where fast, wear‑free switching and EMC behaviour matter.
Related standards
Relevant cross-references cited in EN 60947-4-3 include:
- IEC/EN 60947-1 (general rules for low-voltage switchgear)
- IEC/EN 61000-4 series (EMC testing)
- IEC/EN 60269-1 (low-voltage fuses)
- CISPR 11 / EN 55011 (emissions for industrial equipment)
Keywords: EN 60947-4-3, IEC 60947-4-3, AC semiconductor controllers, solid-state contactors, low-voltage switchgear, non-motor loads, EMC requirements, marking requirements, type tests, short-circuit coordination.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2014
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SIST EN 60947-4-3:2000
SIST EN 60947-4-3:2000/A1:2007
SIST EN 60947-4-3:2000/A2:2011
1L]NRQDSHWRVWQHVWLNDOQHLQNUPLOQHQDSUDYHGHO .RQWDNWRUMLLQPRWRUVNL
]DJDQMDOQLNLSROSUHYRGQLãNLNUPLOQLNLLQNRQWDNWRUMLQDL]PHQLþQLWRN]D
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Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC
semiconductor controllers and contactors for non-motor loads
Niederspannungsschaltgeräte - Teil 4-3: Schütze und Motorstarter - Halbleiter-
Steuergeräte und -Schütze für nichtmotorische Lasten für Wechselspannung
Appareillage à basse tension - Partie 4-3: Contacteurs et démarreurs de moteurs -
Gradateurs et contacteurs à semiconducteurs pour charges, autres que des moteurs, à
courant alternatif
Ta slovenski standard je istoveten z: EN 60947-4-3:2014
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 60947-4-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 29.130.20; 31.180 Supersedes EN 60947-4-3:2000
English Version
Low-voltage switchgear and controlgear - Part 4-3: Contactors
and motor-starters - AC semiconductor controllers and
contactors for non-motor loads
(IEC 60947-4-3:2014)
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 -Schütze für
semiconducteurs pour charges, autres que des moteurs, à nichtmotorische Lasten für Wechselspannung
courant alternatif (IEC 60947-4-3:2014)
(CEI 60947-4-3:2014)
This European Standard was approved by CENELEC on 2014-06-11. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60947-4-3:2014 E
Foreword
The text of document 121A/2/FDIS, future edition 2 of IEC 60947-4-3, prepared by SC 17B “Low-
voltage switchgear and controlgear” of IEC/TC 17 “Switchgear and controlgear" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN 60947-4-3:2014.
The following dates are fixed:
• latest date by which the document has to be (dop) 2015-03-11
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-06-11
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EU Directive 2004/108/EC.
For relationship with EU Directive(s), see informative Annex ZZ, which is an integral part of this
document.
This document supersedes EN 60947-4-3:2000.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment
Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC).
Endorsement notice
The text of the International Standard IEC 60947-4-3:2014 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 standards indicated:
IEC 60085:2007 NOTE Harmonized as EN 60085:2008 (modified).
IEC 60146 (series) NOTE Harmonized as EN 60146 (series) (not modified).
IEC 60664 (series) NOTE Harmonized as EN 60664 (series) (not modified).
IEC 60947-4-2:2011 NOTE Harmonized as EN 60947-4-2:2012 (modified).
IEC 61439 (series) NOTE Harmonized as EN 61439 (series) (not modified).
- 3 - EN 60947-4-3:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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.cenelec.eu
Publication Year Title EN/HD Year
IEC 60269-1 2006 Low-voltage fuses -- Part 1: General EN 60269-1 2007
requirements
IEC 60410 1973 Sampling plans and procedures for - -
inspection by attributes
IEC 60947-1 2007 Low-voltage switchgear and controlgear -- EN 60947-1 2007
Part 1: General rules
+A1 2010 +A1 2011
IEC 61000-4 - Electromagnetic compatibility (EMC) -- Part EN 61000-4 -
(series) 4-1: Testing and measurement techniques (series)
- Overview of IEC 61000-4 series
IEC 61000-4-5 2005 Electromagnetic compatibility (EMC) -- Part EN 61000-4-5 2006
4-5: Testing and measurement techniques
- Surge immunity test
CISPR 11 (mod) 2009 Industrial, scientific and medical equipment EN 55011 2009
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
CISPR 11:2009/A1 2010 EN 55011:2009/A1 2010
Annex ZZ
(informative)
Coverage of Essential Requirements of EU Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers
protection requirements of Annex I Article 1 of the EU Directive 2004/108/EC.
Compliance with this standard provides presumption of conformity with the specified essential
requirements of the Directives concerned.
NOTE: Other requirements and other EU Directives may be applicable to the products falling within
the scope of this standard.
IEC 60947-4-3 ®
Edition 2.0 2014-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 4-3: Contactors and motor-starters – AC semiconductor controllers and
contactors for non-motor loads
Appareillage à basse tension –
Partie 4-3: Contacteurs et démarreurs de moteurs – Gradateurs et contacteurs à
semiconducteurs pour charges, autres que des moteurs, à courant alternatif
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XC
ICS 29.130.20, 31.180 ISBN 978-2-8322-1567-8
– 2 – IEC 60947-4-3:2014 © IEC 2014
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 10
3 Terms, definitions, symbols and abbreviations . 10
3.1 Terms and definitions concerning a.c. semiconductor (non-motor-load)
control devices . 11
3.1.1 AC semiconductor controllers and contactors (solid-state
contactors) (see Figure 1) . 11
3.1.2 Hybrid controllers and contactors (see Figure 1) . 14
3.2 Vacant . 18
3.3 Symbols and abbreviations . 18
4 Classification . 18
5 Characteristics of a.c. semiconductor controllers and contactors . 19
5.1 Summary of characteristics . 19
5.2 Type of equipment . 19
5.3 Rated and limiting values for main circuits . 22
5.3.1 Rated voltages . 22
5.3.2 Currents . 22
5.3.3 Rated frequency . 22
5.3.4 Rated duty . 22
5.3.5 Normal load and overload characteristics . 23
5.3.6 Rated conditional short-circuit current . 24
5.4 Utilization category . 24
5.4.1 Assignment of ratings based on the results of tests . 25
5.5 Control circuits . 26
5.6 Auxiliary circuits . 26
5.7 Vacant . 26
5.8 Coordination with short-circuit protective devices (SCPD) . 26
6 Product information . 26
6.1 Nature of information . 26
6.2 Marking . 28
6.3 Instructions for installation, operation and maintenance . 28
7 Normal service, mounting and transport conditions . 28
7.1 Normal service conditions . 28
7.1.1 Ambient air temperature . 28
7.1.2 Altitude . 28
7.1.3 Atmospheric conditions . 28
7.1.4 Shock and vibrations . 29
7.2 Conditions during transport and storage . 29
7.3 Mounting . 29
7.4 Electrical system disturbances and influences . 29
8 Constructional and performance requirements . 29
8.1 Constructional requirements . 29
8.1.1 General . 29
IEC 60947-4-3:2014 © IEC 2014 – 3 –
8.1.2 Materials . 29
8.1.3 Current-carrying parts and their connections . 29
8.1.4 Clearances and creepage distances . 29
8.1.5 Actuator . 30
8.1.6 Indication of the contact position . 30
8.1.7 Additional requirements for equipment suitable for isolation . 30
8.1.8 Terminals . 30
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
8.2 Performance requirements . 30
8.2.1 Operating conditions . 30
8.2.2 Temperature rise . 32
8.2.3 Dielectric properties . 34
8.2.4 Normal load and overload performance requirements . 35
8.2.5 Coordination with short-circuit protective devices . 42
8.3 EMC requirements . 42
8.3.1 General . 42
8.3.2 Emission . 43
8.3.3 Immunity . 43
9 Tests . 45
9.1 Kinds of tests . 45
9.1.1 General . 45
9.1.2 Type tests . 45
9.1.3 Routine tests . 45
9.1.4 Sampling tests . 45
9.1.5 Special tests . 46
9.2 Compliance with constructional requirements . 46
9.3 Compliance with performance requirements . 46
9.3.1 Test sequences . 46
9.3.2 General test conditions . 47
9.3.3 Performance under no load, normal load and overload
conditions . 47
9.3.4 Performance under short-circuit conditions . 54
9.3.5 Disponible . 58
9.4 General . 58
9.4.1 EMC emission tests . 58
9.4.2 EMC immunity tests . 59
9.5 Routine and sampling tests . 61
9.5.1 General . 61
9.5.2 Operation and operating limits . 61
9.5.3 Dielectric tests . 61
Annex A (normative) Marking and identification of terminals . 62
A.1 General . 62
A.2 Marking and identification of terminals of controller and contactors . 62
A.2.1 Marking and identification of terminals of main circuits . 62
– 4 – IEC 60947-4-3:2014 © IEC 2014
A.2.2 Marking and identification of terminals of control circuits . 62
A.2.3 Marking and identification of auxiliary circuits . 62
Annex B (informative) Typical service conditions for controllers and contactors . 65
B.1 Control of resistive heating elements . 65
B.2 Switching of electric discharge lamp controls . 65
B.3 Switching of incandescent lamps . 66
B.4 Switching of transformers. 66
B.5 Switching of capacitor banks . 66
Annex C Vacant . 67
Annex D Vacant . 68
Annex E Vacant . 69
Annex F (informative) Operating capability. 70
Annex G Vacant . 73
Annex H Vacant . 74
Annex I (normative) Modified test circuit for short-circuit testing of semiconductor
contactors and controllers . 75
Annex J (informative) Flowchart for constructing bypassed semiconductor controllers
tests . 77
Bibliography . 78
Figure 1 – Graphical possibilities of controllers . 13
Figure 2 – Methods of connecting . 21
Figure F.1 – Thermal stability test profile . 70
Figure F.2 – Overload capability test profile . 71
Figure F.3 – Blocking and commutating capability test profile . 72
Figure I.1 – Modified circuit for short-circuit testing of semiconductor devices . 75
Figure I.2 – Time line for the short-circuit test of 9.3.4.1.6 . 76
Table 1 – Functional possibilities of controllers and contactors . 14
Table 2 – Utilization categories . 25
Table 3 – Relative levels of severity . 25
Table 4 – Temperature rise limits for insulated coils in air and in oil . 34
Table 5 – Intermittent duty test cycle data . 34
Table 6 – Minimum overload current withstand time (T ) in relation to overload current
x
ratio (X) . 36
Table 7 − Minimum requirements for thermal stability test conditions . 37
Table 8 – Minimum requirements for overload capability test conditions . 38
Table 9 – Minimum requirements and conditions for performance testing, including
blocking and commutating capability . 39
Table 10 – Making and breaking capacity test – Making and breaking conditions
according to utilization categories for the mechanical switching device of hybrid
semiconductor controller and contactor H4, H5 . 40
Table 11 – Conventional operational performance – Making and breaking conditions
according to utilization categories for the mechanical switching device of hybrid
controllers and contactors H4B, H5B . 41
Table 12 – Specific performance criteria when EM disturbances are present . 44
IEC 60947-4-3:2014 © IEC 2014 – 5 –
Table 13 – Thermal stability test specifications . 51
Table 14 – Initial case temperature requirements . 52
Table 15 – Terminal disturbance voltage limits for conducted radiofrequency emission . 59
Table 16 – Radiated emissions test limits . 59
Table A.1 – Main circuit terminal markings . 62
– 6 – IEC 60947-4-3:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 4-3: Contactors and motor-starters –
AC semiconductor controllers and
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,
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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
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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
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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 17B: Low-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
This second edition cancels and replaces the first edition published in 1999, Amendment
1:2006 and Amendment 2:2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Update of the marking requirements (6.1);
b) Update of the EMC requirements (8.3.2); and
c) Update of the tests requirements (9.3.1, 9.4, 9.4.1.1, 9.4.1.2, 9.4.2.1, 9.4.2.2, 9.4.2.3,
9.4.2.4, 9.4.2.6).
IEC 60947-4-3:2014 © IEC 2014 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
121A/2/FDIS 121A/14/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication 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.
This standard shall be read in conjunction with IEC 60947-1, Low voltage switchgear and
controlgear – Part 1: General rules. The provisions of the general rules are applicable to this
standard, where specifically called for.
The provisions of the general rules (IEC 60947-1) are applicable to this standard, where
specifically called for. Clauses and subclauses thus applicable, as well as tables, figures, and
annexes, are identified by reference to IEC 60947-1, for example 1.2.3 of IEC 60947-1:2007,
Amendment 1 (2010), Table 4 of IEC 60947-1:2007, Amendment 1 (2010) or Annex A of
IEC 60947-1:2007.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 8 – IEC 60947-4-3:2014 © IEC 2014
INTRODUCTION
This part of IEC 60947 covers low-voltage a.c. semiconductor controllers and contactors
(solid-state contactors) intended for the use with non-motor loads. As controllers, they have
many capabilities beyond the simple switching on and off of non-motor loads. As 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 2.3.1 of IEC 60947-1:2007,). This standard
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.
The generic term, "controller", is used in this standard wherever the unique features of the
power semiconductor switching elements are the most significant points of interest. The
generic term "contactor" is used in this standard wherever the feature of simple switching on
and off is the most significant point of interest. Specific designations (for example, form 4,
form HxB, etc.) are used wherever the unique features of various configurations comprise
significant points of interest.
IEC 60947-4-3:2014 © IEC 2014 – 9 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 4-3: Contactors and motor-starters –
AC semiconductor controllers and
contactors for non-motor loads
1 Scope
This part of IEC 60947 applies to a.c. semiconductor non-motor load controllers and
contactors intended for performing electrical operations by changing the state of a.c. electric
circuits between the ON-state and the OFF-state. Typical applications are classified by
utilization categories given in Table 2.
As controllers, they may be used to reduce the amplitude of the r.m.s. a.c. voltage on the load
terminals from that of the applied voltage – either continuously or for a specified period of
time. The half-wave period of the a.c. wave form remains unchanged from that of the applied
voltage.
They may include a series mechanical switching device and are intended to be connected to
circuits, the rated voltage of which does not exceed 1 000 V a.c.
This standard characterizes controllers and contactors for use with or without bypass
switching devices.
The semiconductor controllers and contactors dealt with in this standard are not normally
intended to interrupt short-circuit currents. Therefore, suitable short-circuit protection (see
8.2.5) should form part of the installation but not necessarily of the controller itself.
In this context, this standard gives requirements for semiconductor controllers and contactors
associated with separate short-circuit protective devices.
This standard does not apply to:
− operation of a.c. and d.c. motors;
− low-voltage a.c. semiconductor motor controllers and starters covered by IEC 60947-4-2;
− electronic a.c. power controllers covered by the IEC 60146 series;
− all-or-nothing solid-state relays.
Contactors and control-circuit devices used in semiconductor controllers and contactors
should comply with the requirements of their relevant product standard. Where mechanical
switching devices are used, they should meet the requirements of their own IEC product
standard and the additional requirements of this standard.
The object of this standard is to state
a) the characteristics of semiconductor controllers and contactors and associated equipment;
b) the conditions with which semiconductor controllers and contactors should comply with
reference to:
− their operation and behaviour;
− their dielectric properties;
− the degrees of protection provided by their enclosures, where applicable;
– 10 – IEC 60947-4-3:2014 © IEC 2014
− their construction;
c) the tests intended for confirming that these conditions have been met, and the methods to
be adopted for these tests;
d) the information to be given with the equipment or in the manufacturer's literature.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60269-1:2006, Low-voltage fuses – Part 1: General requirements
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
Amendment 1:2010
IEC 61000-4 (all parts), Electromagnetic compatibility (EMC) – Part 4:Testing and
measurement techniques
IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
CISPR 11:2009, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Amendment 1:2010
3 Terms, definitions, symbols and abbreviations
For the purposes of this document, the terms and definitions given in Clause 2 of IEC 60947-
1:2007, Amendment 1 (2010), as well as the following additional terms and definitions apply:
Reference
A
AC semiconductor controller . 3.1.1.1
B
Bypassed controller . 3.1.24
C
Current-limit function . 3.1.3
D
Defined-point switching (of a semiconductor controller) . 3.1.14.4.1
F
Full-on (state of controllers) . 3.1.10
H
Hybrid controllers or contactors, form HxA (where x = 4 or 5) . 3.1.2.1
Hybrid controllers or contactors, form HxB . 3.1.2.2
I
Instantaneous switching function . 3.1.14.3
L
Load control . 3.1.4
M
IEC 60947-4-3:2014 © IEC 2014 – 11 –
Minimum load current . 3.1.11
Minimum load current detection . 3.1.11.1
O
OFF-state . 3.1.12
OFF-state leakage current . 3.1.13
OFF-time . 3.1.23
ON-state . 3.1.9
ON-time . 3.1.22
OPEN position . 3.1.2.3
Operating capability . 3.1.16
Operating cycle (of a controller) . 3.1.15
Operation (of a controller) . 3.1.14
Overcurrent protective means OCPM . 3.1.21
Overload current profile . 3.1.17
R
Ramp-down . 3.1.6
Ramp-up . 3.1.5
Random point switching (of a semiconductor controller) . 3.1.14.4.3
Rating index . 3.1.18
S
Semiconductor controller (form 4) . 3.1.1.1.1
Semiconductor direct-on-line (DOL) controller (form 5) . 3.1.1.1.3
Switching function . 3.1.14.1
Switching point . 3.1.14.4
T
Trip-free controller . 3.1.20
Tripping operation (of a controller) . 3.1.19
Z
Zero-point switching (of a semiconductor controller) . 3.1.14.4.2
3.1 Terms and definitions concerning a.c. semiconductor (non-motor-load) control
devices
3.1.1 AC semiconductor controllers and contactors (solid-state contactors) (see
Figure 1)
3.1.1.1
a.c. semiconductor controller
semiconductor switching device that provides a switching function for an a.c. electrical load
(non-motor load) and an OFF-state
Note 1 to entry: Because dangerous levels of leakage currents (see 3.1.13) can exist in a semiconductor
controller in the OFF-state, the load terminals should be considered to be live at all times.
Note 2 to entry: In a circuit where the current passes through zero (alternately or otherwise), the effect of "not
making" the current following such a zero value is equivalent to breaking the current.
Note 3 to entry: See 2.2.3 of IEC 60947-1:2007 for the definition of semiconductor switching device.
3.1.1.1.1
semiconductor controller (form 4)
a.c. semiconductor controller in which the switching function may comprise any method
specified by the manufacturer. It provides control functions which may include any
combination of ramp-up, load control or ramp-down. A full-on state may also be provided
3.1.1.1.2
Vacant
– 12 – IEC 60947-4-3:2014 © IEC 2014
3.1.1.1.3
semiconductor direct-on-line controller (form 5)
semiconductor DOL controller (form 5)
special form of a.c. semiconductor controller in which the switching function is limited to the
full-voltage, unramped method only and where the additional control function is limited to
providing FULL-ON (also known as a semiconductor contactor or solid-state contactor)
Note 1 to entry: It is a device (see 2.2.13 of IEC 60947-1:2007) which performs the function of a contactor by
utilizing a semiconductor switching device (see 2.2.3 of IEC 60947-1:2007). It has only one position of rest (OFF-
state or Open state in the case of an HxB hybrid controller) and is operated by the application of a control signal. It
is capable of carrying load currents as well as changing the state of the said load (electrical circuit) between the
FULL-ON and the OFF-states (Open) under normal circuit conditions including operating overload conditions.
IEC 60947-4-3:2014 © IEC 2014 – 13 –
3.1.1.2
Vacant
Device
L T
Controller
U
(all forms) e
U
c
IEC 1408/14
L T
a
Hybrid controller HxA
U
e
where x = 4 or 5
U
c2
U
c1
IEC 1409/14
L T
b
Hybrid controller HxB
U
e
where x = 4 or 5
U
c1
IEC 1410/14
Parallel mechanical
contact
L
T
Semiconductor controller
(Forms 4,5)
IEC 1411/14
Bypassed controller
Parallel mechanical
contact
Hybrid controller
c
Series
Bypassed hybrid controller
L T
Semiconductor
mechanical
controller
contact
(Forms H × A, H × B)
IEC 1412/14
a
Two separate controls for the controller and the series mechanical switching device respectively.
b
One control only for the series mechanical switching device.
c
For other configurations, tests can be suitably adapted by agreement between the user and the manufacturer.
Figure 1 – Graphical possibilities of controllers
– 14 – IEC 60947-4-3:2014 © IEC 2014
Table 1 – Functional possibilities of controllers and contactors
Device Form 4 Form 5
Semiconductor OFF-state Not available
controller
Ramp-up
Load control
FULL-ON state
Ramp-down
Semiconductor Not available OFF-state
DOL contactor
Switch-on function
FULL-ON state
Hybrid H4A: H5A:
a
controller HxA
– open state – open state
where x = 4 or 5
– OFF-state – OFF-state
– ramp-up – switch-on function
– load control – FULL-ON state
– FULL-ON state
– ramp-down
Hybrid H4B: H5B:
b
controller HxB
– open state – op
...
Frequently Asked Questions
SIST EN 60947-4-3:2014 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC semiconductor controllers and contactors for non-motor loads". This standard covers: IEC 60947-4-3:2014 applies to a.c. semiconductor non-motor load controllers and contactors intended for performing electrical operations by changing the state of a.c. electric circuits between the ON-state and the OFF-state. Typical applications are classified by utilization categories given in Table 2. This second edition cancels and replaces the first edition published in 1999, Amendment 1:2006 and Amendment 2:2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Update of the marking requirements (6.1); b) Update of the EMC requirements (8.3.2); and c) Update of the tests requirements (9.3.1, 9.4, 9.4.1.1, 9.4.1.2, 9.4.2.1, 9.4.2.2, 9.4.2.3, 9.4.2.4, 9.4.2.6).
IEC 60947-4-3:2014 applies to a.c. semiconductor non-motor load controllers and contactors intended for performing electrical operations by changing the state of a.c. electric circuits between the ON-state and the OFF-state. Typical applications are classified by utilization categories given in Table 2. This second edition cancels and replaces the first edition published in 1999, Amendment 1:2006 and Amendment 2:2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Update of the marking requirements (6.1); b) Update of the EMC requirements (8.3.2); and c) Update of the tests requirements (9.3.1, 9.4, 9.4.1.1, 9.4.1.2, 9.4.2.1, 9.4.2.2, 9.4.2.3, 9.4.2.4, 9.4.2.6).
SIST EN 60947-4-3:2014 is classified under the following ICS (International Classification for Standards) categories: 29.130.20 - Low voltage switchgear and controlgear. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 60947-4-3:2014 has the following relationships with other standards: It is inter standard links to SIST EN 60947-4-3:2000, SIST EN 60947-4-3:2000/A1:2007, SIST EN 60947-4-3:2000/A2:2011, SIST EN IEC 60947-4-3:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 60947-4-3:2014 is associated with the following European legislation: EU Directives/Regulations: 2004/108/EC, 2004/108/EU, 2006/95/EC, 2014/30/EU, 2014/35/EU, TRRTP129; Standardization Mandates: M/511. 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.
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