IEC 60947-4-3:1999

NORME CEI
INTERNATIONALE
IEC
60947-4-3
INTERNATIONAL
Edition 1.1
STANDARD
2007-01
Edition 1:1999 consolidée par l'amendement 1:2006
Edition 1:1999 consolidated with amendment 1:2006
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
Low-voltage switchgear and controlgear –
Part 4-3:
Contactors and motor-starters –
AC semiconductor controllers
and contactors for non-motor loads
Numéro de référence
Reference number
CEI/IEC 60947-4-3:1999+A1:2006

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devient la CEI 60034-1. example, IEC 34-1 is now referred to as IEC 60034-1.
Editions consolidées Consolidated editions
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.
NORME CEI
INTERNATIONALE
IEC
60947-4-3
INTERNATIONAL
Edition 1.1
STANDARD
2007-01
Edition 1:1999 consolidée par l'amendement 1:2006
Edition 1:1999 consolidated with amendment 1:2006
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
Low-voltage switchgear and controlgear –
Part 4-3:
Contactors and motor-starters –
AC semiconductor controllers
and contactors for non-motor loads

© IEC 2007 Droits de reproduction réservés ⎯ Copyright - all rights reserved
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CODE PRIX
CT
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

– 2 – 60947-4-3 © CEI:1999+A1:2006
SOMMAIRE
AVANT-PROPOS.6
INTRODUCTION.10

1 Domaine d'application et objet.12
2 Références normatives.14
3 Définitions, symboles et abréviations.18
3.1 Définitions concernant les appareils de commande à semiconducteurs
(pour des charges autres que des moteurs) pour courant alternatif .20
3.2 Définitions relatives à la CEM.32
3.3 Symboles et abréviations .34
4 Classification.36
5 Caractéristiques des gradateurs et contacteurs à semiconducteurs
à courant alternatif .36
5.1 Enumération des caractéristiques.36
5.2 Type du matériel .36
5.3 Valeurs assignées et valeurs limites des circuits principaux .42
5.4 Catégories d’emploi.46
5.5 Circuits de commande.50
5.6 Circuits auxiliaires .50
5.7 Disponible .52
5.8 Coordination avec les dispositifs de protection contre les courts-circuits (DPCC) .52
6 Information sur le matériel .52
6.1 Nature des informations .52
6.2 Marquage.54
6.3 Instructions d’installation, de fonctionnement et d’entretien .54
7 Conditions normales de service, de montage et de transport .56
7.1 Conditions normales de service.56
7.2 Conditions pendant le transport et le stockage .56
7.3 Montage .56
7.4 Perturbations du réseau électrique et influences .58
8 Dispositions relatives à la construction et au fonctionnement .58
8.1 Dispositions constructives .58
8.2 Dispositions relatives au fonctionnement.60
8.3 Prescriptions concernant la CEM.86
9 Essais .94
9.1 Nature des essais .94
9.2 Conformité aux dispositions relatives à la construction.96
9.3 Conformité aux prescriptions relatives au fonctionnement .96
9.4 Essais spéciaux .128

Annexe A (normative) Marquage et identification des bornes.130
Annexe B (informative) Conditions de service typique pour les gradateurs
et contacteurs .136
Annexe C Disponible .140
Annexe D (normative) Prescriptions pour les essais d'émission rayonnée.142

60947-4-3 © IEC:1999+A1:2006 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.9

1 Scope and object.13
2 Normative references .15
3 Definitions, symbols and abbreviations.19
3.1 Definitions concerning a.c. semiconductor (non-motor-load) control devices .21
3.2 EMC definitions .33
3.3 Symbols and abbreviations.35
4 Classification.37
5 Characteristics of a.c. semiconductor controllers and contactors .37
5.1 Summary of characteristics .37
5.2 Type of equipment.37
5.3 Rated and limiting values for main circuits.43
5.4 Utilization category.47
5.5 Control circuits .51
5.6 Auxiliary circuits .51
5.7 Vacant.53
5.8 Coordination with short-circuit protective devices (SCPD) .53
6 Product information .53
6.1 Nature of information.53
6.2 Marking .55
6.3 Instructions for installation, operation and maintenance .55
7 Normal service, mounting and transport conditions.57
7.1 Normal service conditions .57
7.2 Conditions during transport and storage .57
7.3 Mounting .57
7.4 Electrical system disturbances and influences .59
8 Constructional and performance requirements.59
8.1 Constructional requirements.59
8.2 Performance requirements .61
8.3 EMC requirements.87
9 Tests .95
9.1 Kinds of tests .95
9.2 Compliance with constructional requirements .97
9.3 Compliance with performance requirements .97
9.4 Special tests .129

Annex A (normative) Marking and identification of terminals . 131
Annex B (informative) Typical service conditions for controllers and contactors . 137
Annex C Vacant.141
Annex D (normative) Requirements for radiated emission testing .143

– 4 – 60947-4-3 © CEI:1999+A1:2006
Annexe E (informative) Méthode de conversion des limites d'émission rayonnée
du CISPR 11 en puissance transmise équivalente .146
Annexe F (informative) Aptitude au fonctionnement .148
Annexe G (informative) Exemples de configuration de circuits de commande . 154
Annexe H (informative) Points faisant l'objet d'un accord entre le constructeur
et l'utilisateur .158
Annexe I (normative) Circuit d’essai modifié pour l’essai de court-circuit
des contacteurs et gradateurs à semiconducteurs. 160
Annexe J (informative) Diagramme pour définir les essais des gradateurs
à semiconducteurs à dérivation.164

Figure 1 – Représentations graphiques des gradateurs .22
Figure 2 – Méthodes de connexion .40
Figure F.1 – Profil d'essai de stabilité thermique.148
Figure F.2 – Profil d'essai de capacité de surcharge .150
Figure F.3 − Profil d'essai de capacité de blocage et d'aptitude à la commutation.152
Figure I.1 − Circuit modifié pour l’essai de court-circuit des appareils à semiconducteurs .160
Figure I.2 – Chronologie pour l’essai de court-circuit de 9.3.4.1.6 .162

Tableau 1 − Fonctions possibles des gradateurs et contacteurs.24
Tableau 2 − Catégories d’emploi.48
Tableau 3 − Niveaux de sévérité relatifs .50
Tableau 17 – Limites d’échauffement pour les bobines isolées dans l’air et dans l’huile.66
Tableau 18 – Données pour les cycles d’essai de service intermittent .68
Tableau 4 − Durée minimale (T ) de tenue au courant de surcharge en fonction
x
du rapport (X) du courant de surcharge.74
Tableau 5 − Prescriptions minimales pour les conditions d’essai de stabilité thermique .74
Tableau 6 − Prescriptions minimales pour les conditions d’essai de tenue aux surcharges .76
Tableau 7 – Prescriptions minimales et conditions pour les essais de fonctionnement,
y compris l’aptitude au blocage et à la commutation .78
Tableau 8 − Essai de fermeture et de coupure − Conditions d’établissement et de coupure
selon les catégories d’emploi pour les dispositifs mécaniques de connexion de gradateur
et contacteur hybride H4, H5 .80
Tableau 9 − Essai de fonctionnement conventionnel − Conditions d’établissement
et de coupure selon les catégories d’emploi pour les dispositifs mécaniques de connexion
des gradateurs et contacteurs H4B, H5B .82
Tableau 10 − Critères de comportement spécifiques en présence de perturbations
électromagnétiques.92
Tableau 11 − Spécifications d'essai pour la stabilité thermique .106
Tableau 12 − Conditions de température initiale du boîtier.106
Tableau 14 − Limites de perturbation en tension sur les bornes
pour les émissions conduites aux fréquences radioélectriques.122
Tableau 15 − Limites d'essai d'émissions rayonnées .122
Tableau 16 − Creux de tension et coupures brèves.126
Tableau A.1 – Marquage des bornes des circuits principaux .130

60947-4-3 © IEC:1999+A1:2006 – 5 –
Annex E (informative) Method of converting CISPR 11 radiated emission limits
to transmitted power equivalents.147
Annex F (informative) Operating capability .149
Annex G (informative) Examples of control-circuit configurations . 155
Annex H (informative) Items subject to agreement between manufacturer and user . 159
Annex I (normative) Modified test circuit for short-circuit testing
of semiconductor contactors and controllers .161
Annex J (informative) Flowchart for constructing bypassed
semiconductor controllers tests.165

Figure 1 – Graphical possibilities of controllers .23
Figure 2 – Methods of connecting .41
Figure F.1 – Thermal stability test profile .149
Figure F.2 – Overload capability test profile .151
Figure F.3 − Blocking and commutating capability test profile .153
Figure I.1 − Modified circuit for short-circuit testing of semiconductor devices.161
Figure I.2 – Time line for the short-circuit test of 9.3.4.1.6 .163

Table 1 − Functional possibilities of controllers and contactors .25
Table 2 − Utilization categories .49
Table 3 − Relative levels of severity.51
Table 17 – Temperature rise limits for insulated coils in air and in oil.67
Table 18 – Intermittent duty test cycle data.69
Table 4 – Minimum overload current withstand time (T ) in relation
x
to overload current ratio (X) .75
Table 5 − Minimum requirements for thermal stability test conditions .75
Table 6 – Minimum requirements for overload capability test conditions .77
Table 7 – Minimum requirements and conditions for performance testing,
including blocking and commutating capability .79
Table 8 − 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 .81
Table 9 − Conventional operational performance – Making and breaking conditions
according to utilization categories for the mechanical switching device of hybrid controllers
and contactors H4B, H5B.83
Table 10 – Specific performance criteria when EM disturbances are present .93
Table 11 – Thermal stability test specifications .107
Table 12 – Initial case temperature requirements.107
Table 14 –Terminal disturbance voltage limits for conducted radiofrequency emission.123
Table 15 – Radiated emissions test limits .123
Table 16 – Voltage dips and short-time interruption .127
Table A.1 – Main circuit terminal markings.131

– 6 – 60947-4-3 © CEI:1999+A1:2006
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
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

AVANT-PROPOS
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2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
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responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.
La Norme internationale CEI 60947-4-3 a été établie par le sous-comité 17B: Appareillage à
basse tension, du comité d'études 17 de la CEI: Appareillage.
Cette norme doit être utilisée conjointement avec la CEI 60947-1.
La présente version consolidée de la CEI 60947-4-3 est issue de la première édition (1999)
[documents 17B/1000/FDIS et 17B/1013/RVD], de son amendement 1 (2006) [documents
17B/1486/FDIS et 17B/1510/RVD] et de son corrigendum de mai 2000.
Elle porte le numéro d'édition 1.1.
Une ligne verticale dans la marge indique où la publication de base a été modifiée par
l'amendement 1.
60947-4-3 © IEC:1999+A1:2006 – 7 –
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
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6) All users should ensure that they have the latest edition of this publication.
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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 standard shall be used in conjunction with IEC 60947-1.
This consolidated version of IEC 60947-4-3 is based on the first edition (1999) [documents
17B/1000/FDIS and 17B/1013/RVD], its amendment 1 (2006) [documents 17B/1486/FDIS and
17B/1510/RVD] and its corrigendum of May 2000.
It bears the edition number 1.1.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
– 8 – 60947-4-3 © CEI:1999+A1:2006
Les annexes A, D et I font partie intégrante de cette norme.
Les annexes B, E, F, G, H et J sont données uniquement à titre d'information.
Le comité a décidé que le contenu de la publication de base et de ses amendements ne sera
pas modifié avant la date de maintenance indiquée sur le site web de la CEI sous
"http://webstore.iec.ch" dans les données relatives à la publication recherchée. A cette date,
la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
60947-4-3 © IEC:1999+A1:2006 – 9 –
Annexes A, D and I form an integral part of this standard.
Annexes B, E, F, G, H and J are for information only.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result 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.
– 10 – 60947-4-3 © CEI:1999+A1:2006
INTRODUCTION
La présente partie de la CEI 60947 concerne les gradateurs et les contacteurs à basse
tension à semiconducteurs à courant alternatif prévus pour être utilisés avec des charges
autres que des moteurs. En tant que gradateurs, ils ont de nombreuses possibilités au-delà
de la simple commutation de charge. En tant que contacteurs, ils assurent la même fonction
que les contacteurs mécaniques, mais utilisent un ou plusieurs dispositifs de commutation à
semiconducteurs dans leurs pôles principaux.
Les appareils peuvent être unipolaires ou multipolaires (voir 2.3.1 de la CEI 60947-1). Cette
norme traite des dispositifs complets caractérisés comme étant une unité incorporant tout le
matériel de dissipation de chaleur nécessaire et les bornes. Il comprend les appareils avec
toutes les bornes nécessaires qui sont fournies avec ou sans dissipateur de chaleur
démontable pour montage par les utilisateurs lorsque le constructeur donne avec le dispositif
des informations détaillées pour choisir le dissipateur de chaleur et pour monter l’appareil sur
le dissipateur de chaleur.
Le terme générique «gradateur» est utilisé dans la présente norme là où seules les
caractéristiques de commutation des éléments de puissance à semiconducteurs représentent
l’intérêt essentiel. Le terme générique «contacteur» est utilisé dans la présente norme partout
où seule la caractéristique de commutation marche/arrêt représente l'intérêt essentiel. Les
désignations spécifiques (par exemple variante 4, variante HxB, etc.) sont utilisées chaque
fois que les caractéristiques spécifiques de ces différentes configurations représentent
l’intérêt essentiel.
Les dispositions des règles générales (CEI 60947-1) sont applicables à la présente norme
lorsque celle-ci le précise. Les articles, les paragraphes ainsi que les tableaux, les figures et
les annexes qui sont applicables sont identifiés par référence à la CEI 60947-1 par exemple
1.2.3 de la CEI 60947-1, tableau 4 de la CEI 60947-1 ou annexe A de la CEI 60947-1.

60947-4-3 © IEC:1999+A1:2006 – 11 –
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). 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.
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, table 4 of IEC 60947-1 or
annex A of IEC 60947-1.
– 12 – 60947-4-3 © CEI:1999+A1:2006
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

1 Domaine d'application et objet
La présente partie de la CEI 60947 s'applique aux gradateurs et démarreurs à
semiconducteurs à courant alternatif pour des charges autres que des moteurs prévus pour
effectuer des manœuvres électriques en changeant l’état des circuits électriques à courant
alternatif entre l’état passant et l’état bloqué. Des applications typiques sont données au
tableau 2.
En tant que gradateurs, ils peuvent être utilisés afin de réduire l’amplitude de la tension
efficace en courant alternatif sur les bornes côté charge provenant de la tension appliquée,
de façon continue ou pour une période spécifiée de temps. La demi-période de la forme
d’onde en courant alternatif reste inchangée par rapport à celle de la tension appliquée.
Ils peuvent comprendre en série des appareils mécaniques de connexion et sont destinés à
être connectés à des circuits dont la tension assignée ne dépasse pas 1 000 V en courant
alternatif.
La présente norme définit les caractéristiques des gradateurs et contacteurs pour une
utilisation avec ou sans appareil de connexion de court-circuitage.
Les gradateurs et contacteurs à semiconducteurs couverts par cette norme ne sont
normalement pas prévus pour interrompre des courants de court-circuit. En conséquence, il
convient qu’une protection adaptée contre les courts-circuits (voir 8.2.5) fasse partie de
l’installation mais pas nécessairement du contacteur lui-même.
Dans ce contexte, cette norme donne les prescriptions pour les gradateurs et contacteurs à
semiconducteurs associés à des dispositifs séparés de protection contre les courts-circuits.
La présente norme ne s’applique pas
− aux manœuvres de moteurs à courant alternatif et à courant continu;
− aux gradateurs et démarreurs à basse tension à semiconducteurs de moteurs à courant
alternatif couverts par la CEI 60947-4-2;
− aux gradateurs électroniques de puissance couverts par la CEI 60146;
− aux relais de tout ou rien à l'état solide.
Il convient que les contacteurs et les dispositifs pour circuits de commande utilisés dans les
gradateurs et contacteurs à semiconducteurs soient conformes aux prescriptions de leur
norme de produit correspondante. Lorsque des dispositifs de commutation mécaniques sont
utilisés, il est recommandé qu’ils satisfassent à leur propre norme de produit de la CEI et aux
prescriptions supplémentaires de cette norme.

60947-4-3 © IEC:1999+A1:2006 – 13 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 4-3: Contactors and motor-starters –
AC semiconductor controllers and contactors
for non-motor loads
1 Scope and object
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 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 IEC 60146;
− 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.

– 14 – 60947-4-3 © CEI:1999+A1:2006
La présente norme a pour objet de fixer
a) les caractéristiques des gradateurs et contacteurs à semiconducteurs et le matériel
associé;
b) les conditions à remplir par les gradateurs et les contacteurs à semiconducteurs pour
− leur fonctionnement et leur comportement;
− leurs propriétés diélectriques;
− les degrés de protection procurés par leur enveloppe, le cas échéant;
− leur construction;
c) les essais prévus pour confirmer que ces conditions ont été remplies et les méthodes à
adopter pour ces essais;
d) les informations à donner sur le matériel ou dans la documentation du constructeur.
2 Références normatives
Les documents de référence suivants sont indispensables pour l'application du présent
document. Pour les références datées, seule l'édition citée s'applique. Pour les références
non datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
CEI 60050(161):1990, Vocabulaire Electrotechnique International (VEI) – Chapitre 161:
Compatibilité électromagnétique
Amendement 1 (1997)
Amendement 2 (1998)
CEI 6008
...

IEC 60947-4-3 ®
Edition 1.2 2011-07
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

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IEC 60947-4-3 ®
Edition 1.2 2011-07
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 CU
ICS 29.130.20 ISBN 978-2-88912-517-3

– 2 – 60947-4-3 © IEC:1999+A1:2006
+A2:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6

1 Scope and object . 13
2 Normative references . 15
3 Definitions, symbols and abbreviations . 19
3.1 Definitions concerning a.c. semiconductor (non-motor-load) control devices . 21
3.2 EMC definitions . 33
3.3 Symbols and abbreviations . 35
4 Classification . 37
5 Characteristics of a.c. semiconductor controllers and contactors . 37
5.1 Summary of characteristics . 37
5.2 Type of equipment . 37
5.3 Rated and limiting values for main circuits . 43
5.4 Utilization category . 47
5.5 Control circuits . 51
5.6 Auxiliary circuits . 51
5.7 Vacant . 53
5.8 Coordination with short-circuit protective devices (SCPD) . 53
6 Product information . 53
6.1 Nature of information . 53
6.2 Marking . 55
6.3 Instructions for installation, operation and maintenance . 55
7 Normal service, mounting and transport conditions . 57
7.1 Normal service conditions . 57
7.2 Conditions during transport and storage . 57
7.3 Mounting . 57
7.4 Electrical system disturbances and influences . 59
8 Constructional and performance requirements . 59
8.1 Constructional requirements . 59
8.2 Performance requirements . 61
8.3 EMC requirements . 87
9 Tests . 95
9.1 Kinds of tests . 95
9.2 Compliance with constructional requirements . 97
9.3 Compliance with performance requirements . 97
9.4 Special tests . 129

Annex A (normative) Marking and identification of terminals . 131
Annex B (informative) Typical service conditions for controllers and contactors . 137
Annex C Vacant . 141
Annex D (normative) Requirements for radiated emission testing . 143

60947-4-3 © IEC:1999+A1:2006 – 3 –
+A2:2011
Annex E (informative) Method of converting CISPR 11 radiated emission limits
to transmitted power equivalents . 147
Annex F (informative) Operating capability . 149
Annex G (informative) Examples of control-circuit configurations . 155
Annex H (informative) Items subject to agreement between manufacturer and user . 159
Annex I (normative) Modified test circuit for short-circuit testing
of semiconductor contactors and controllers . 161
Annex J (informative) Flowchart for constructing bypassed
semiconductor controllers tests . 165

Figure 1 – Graphical possibilities of controllers . 23
Figure 2 – Methods of connecting . 41
Figure F.1 – Thermal stability test profile . 149
Figure F.2 – Overload capability test profile . 151
Figure F.3 − Blocking and commutating capability test profile . 153
Figure I.1 − Modified circuit for short-circuit testing of semiconductor devices . 161
Figure I.2 – Time line for the short-circuit test of 9.3.4.1.6 . 163

Table 1 − Functional possibilities of controllers and contactors . 25
Table 2 − Utilization categories . 49
Table 3 − Relative levels of severity . 51
Table 17 – Temperature rise limits for insulated coils in air and in oil . 67
Table 18 – Intermittent duty test cycle data . 69
Table 4 – Minimum overload current withstand time (T ) in relation
x
to overload current ratio (X) . 75
Table 5 − Minimum requirements for thermal stability test conditions . 75
Table 6 – Minimum requirements for overload capability test conditions . 77
Table 7 – Minimum requirements and conditions for performance testing,
including blocking and commutating capability . 79
Table 8 − 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 . 81
Table 9 − Conventional operational performance – Making and breaking conditions
according to utilization categories for the mechanical switching device of hybrid controllers
and contactors H4B, H5B . 83
Table 10 – Specific performance criteria when EM disturbances are present . 93
Table 11 – Thermal stability test specifications . 107
Table 12 – Initial case temperature requirements . 107
Table 14 –Terminal disturbance voltage limits for conducted radiofrequency emission . 123
Table 15 – Radiated emissions test limits . 123
Table 16 – Voltage dips and short-time interruption . 127
Table A.1 – Main circuit terminal markings . 131

– 4 – 60947-4-3 © IEC:1999+A1:2006
+A2:2011
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,
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 17B: Low-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
This standard shall be used in conjunction with IEC 60947-1.
This consolidated version of IEC 60947-4-3 consists of the first edition (1999) [documents
17B/1000/FDIS and 17B/1013/RVD], its amendment 1 (2006) [documents 17B/1486/FDIS and
17B/1510/RVD], its amendment 2 (2011) [documents 17B/1727/FDIS and 17B/1735/RVD] and
its corrigendum of May 2000.
The technical content is therefore identical to the base edition and its amendments and has
been prepared for user convenience.
It bears the edition number 1.2.

60947-4-3 © IEC:1999+A1:2006 – 5 –
+A2:2011
A vertical line in the margin shows where the base publication has been modified by
amendments 1 and 2.
Annexes A, D and I form an integral part of this standard.
Annexes B, E, F, G, H and J are for information only.
The committee has decided that the contents of the base publication and its amendments 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.
– 6 – 60947-4-3 © IEC:1999+A1:2006
+A2:2011
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). 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.
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, table 4 of IEC 60947-1 or
annex A of IEC 60947-1.
60947-4-3 © IEC:1999+A1:2006 – 7 –
+A2:2011
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 4-3: Contactors and motor-starters –
AC semiconductor controllers and contactors
for non-motor loads
1 Scope and object
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 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 IEC 60146;
− 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.

– 8 – 60947-4-3 © IEC:1999+A1:2006
+A2:2011
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;
− 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 referenced documents are indispensable for the application 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.
IEC 60050(161):1990, International Electrotechnical Vocabulary (IEV) – Chapter 161:
Electromagnetic compatibility
Amendment 1 (1997)
Amendment 2 (1998)
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60269-1:2006, Low-voltage fuses – Part 1: General requirements
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60439-1:1999, Low-voltage switchgear and controlgear assemblies – Part 1: Type-tested
and partially type-tested assemblies
Amendment 1 (2004)
IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-4-2:1999, Low-voltage switchgear and controlgear – Part 4-2: Contactors and
motor-starters – AC semiconductor motor controllers and starters
Amendment 1 (2001)
Amendment 2 (2006)
IEC 61000-2-1:1990, Electromagnetic compatibility (EMC) – Part 2: Environment – Section 1:
Description of the environment – Electromagnetic environment for low-frequency conducted
disturbances and signalling in public power supply systems

60947-4-3 © IEC:1999+A1:2006 – 9 –
+A2:2011
IEC 61000-3-2:2005, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤ 16 A per phase)
Amendment 1 (2008)
Amendment 2 (2009)
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3 : Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
Amendment 1 (2007)
Amendment 2 (2010)
IEC 61000-4-4:2004, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
Amendment 1 (2010)
IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6:2008, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests
CISPR 11:2009, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Amendment 1 (2010)
CISPR 14-1, Electromagnetic compatibility – Requirements for household appliances, electric
tools and similar apparatus – Part 1: Emission

– 10 – 60947-4-3 © IEC:1999+A1:2006
+A2:2011
3 Definitions, symbols and abbreviations
For the purposes of this part of IEC 60947, relevant definitions of clause 2 of IEC 60947-1
apply with the following additional definitions:
Reference
A
AC semiconductor controller . 3.1.1.1

B
Burst (of pulses or oscillations) . 3.2.7
Bypassed controller . 3.1.24

C
Controlled operation . 3.1.7
Current-limit function . 3.1.3

D
Defined-point switching (of a semiconductor controller) . 3.1.14.4.1

E
Electromagnetic compatibility, EMC (abbreviation) . 3.2.1
Electromagnetic disturbance . 3.2.3
(electromagnetic) Emission . 3.2.2

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
Immunity (to a disturbance) . 3.2.9
Instantaneous switching function . 3.1.14.3

L
Load control . 3.1.4

M
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

60947-4-3 © IEC:1999+A1:2006 – 11 –
+A2:2011
R
Radio (frequency) disturbance . 3.2.4
Radio frequency interference, RFI (abbreviation) . 3.2.5
Ramp-down . 3.1.6
Ramp switching function . 3.1.14.2
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
Transient (adjective and noun) . 3.2.6
Trip-free controller . 3.1.20
Tripping operation (of a controller) . 3.1.19

V
Voltage surge . 3.2.8

Z
Zero-point switching (of a semiconductor controller) . 3.1.14.4.2

3.1 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 (see 2.2.3 of IEC 60947-1) that provides a switching function
for an a.c. electrical load (non-motor load) and an OFF-state
NOTE 1 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 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.
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
3.1.1.1.3
semiconductor direct-on-line (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).
It is a device (see 2.2.13 of IEC 60947-1) which performs the function of a contactor by
utilizing a semiconductor switching device (see 2.2.3 of IEC 60947-1). 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.

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+A2:2011
3.1.1.2
Vacant
Device
Controller
(all forms)
T
L
U
e
U
c
IEC  1206/99
Hybrid controller HxA*
where x = 4 or 5
T
L
U
e
U
c2
U
c1
IEC  1207/99
Hybrid controller HxB**
where x = 4 or 5
L
T
U
e
U
c1
IEC  1208/99
Parallel mechanical
contact
L
Bypassed controller
T
Semiconductor controller
(Forms 4,5)
IEC  1896/06
Parallel mechanical
contact
Hybrid controller
c
Bypassed hybrid controller
L T
Series
Semiconductor
mechanical
controller
contact
(Forms H × A, H × B)
IEC  1897/06
* Two separate controls for the controller and the series mechanical switching device respectively.
** One control only for the series mechanical switching device.
c
For other configurations, tests may be suitably adapted by agreement between the user and the manufacturer.
Figure 1 – Graphical possibilities of controllers

60947-4-3 © IEC:1999+A1:2006 – 13 –
+A2:2011
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:
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:
controller HxB**
– open state – open state
where x = 4 or 5
– ramp-up – switch-on function

– load control – FULL-ON state

– FULL-ON state
– ramp-down
* Two separate controls for the controller and the series mechanical switching device, respectively.
** One control only for the series mechanical switching device.

3.1.2 Hybrid controllers and contactors (see figure 1)
3.1.2.1
hybrid controllers or contactors form HxA (where x = 4 or 5)
form 4, or form 5 semiconductor controller in series with a mechanical switching device all
rated as a unit. Separate control commands are provided for the series mechanical switching
device and the semiconductor controller or contactor. All the control functions appropriate to
the form of controller specified are provided together with an OPEN position
3.1.2.2
hybrid controllers or contactors, form HxB
form 4 or form 5 semiconductor controller in series with a mechanical switching device all
rated as a unit. A single control command is provided for both the series mechanical switching
device and the semiconductor controller or contactor. All the control functions appropriate to
the form of controller specified are provided with the exception of an OFF-state
3.1.2.3
OPEN position
condition of a hybrid semiconductor controller when the series mechanical switching device is
in the OPEN position (see 2.4.21 of IEC 60947-1)

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+A2:2011
3.1.3
current-limit function
ability of the controller to limit the load current to a specified value. It does not include the
ability to limit the instantaneous current under conditions of short circuit
3.1.4
load control
any deliberate operation which causes changes in the effective power available to the load
through variation of either
− an imposed operating cycle (i.e. variation of the cyclic duration factor F and/or the number
of operating cycles per hour S, see 5.3.4.6)
or
− the load terminal voltage (for example, through phase-angle control)
or
− a combination of these
NOTE 1 Switch-on is a mandatory form of load control that is recognized separately.
NOTE 2 Load control can be performed by a form 5 controller, if an external switching device or control circuit
causes the cyclic transition from the OFF-state to the FULL-ON state and back again (i.e. load control by operating
cycle).
3.1.5
ramp-up
switching (switch-on) function which causes the transition from the OFF-state (or from the
Open state, in the case of a HxB hybrid controller) to the ON-state (i.e. to the FULL-ON state
or to a load control operation) over a defined period of time (the ramp-up time)
3.1.6
ramp-down
switching (switch-off) function which causes the transition from the ON-state (i.e. either from
FULL-ON or from a load control operation) to the OFF-state (or the Open state, in the case of
an HxB hybrid controller) over a defined period of time (ramp-down time)
3.1.7
controlled operation
Not defined (see 3.1.4)
3.1.8
Vacant
3.1.9
ON-state
condition of a semiconductor controller when the conduction current can flow through its main
circuit
3.1.10
FULL-ON (state of controllers)
condition of a controller when the controlling functions are set to provide normal full-voltage
excitation to the load
60947-4-3 © IEC:1999+A1:2006 – 15 –
+A2:2011
3.1.11
minimum load current
minimum operational current in the main circuit which is necessary for correct action of a
controller in the ON-state
NOTE The minimum load current should be given as the r.m.s. value.
3.1.11.1
minimum load current detection
ability of the controller to detect and signal that the load current is below a specified minimum
value, for which signalling can be achieved by the OFF or Open states
3.1.12
OFF-state
condition of a controller when no control signal is applied and no current exceeding the OFF-
state leakage current flows through the main circuit
3.1.13
OFF-state leakage current (I )
L
current which flows through the main circuit of a semiconductor contactor in the OFF-state
3.1.14
operation (of a controller)
transition from the ON-state to the OFF-state or the reverse
3.1.14.1
switching function
function designed to make or break the current during the operation of a controller
3.1.14.2
ramp switching function
See ramp-up and ramp-down
3.1.14.3
instantaneous switching function
switching function which causes the instantaneous transition from the ON-state (i.e. either
from FULL-ON or from a load control operation) to the OFF-state (or the Open state, in the
case of an HxB hybrid controller) or vice versa.
In the case of switch-off, the term "instantaneous" is used to mean the minimum opening time
(see 2.5.39 of IEC 60947-1).
In the case of switch-on, the term "instantaneous" is used to mean make time (see 2.5.43 of
IEC 60947-1) plus the transient time determined only by external circuit impedance
3.1.14.4
switching point
point on the wave form of the applied voltage (see 2.5.32 of IEC 60947-1) at which the
semiconductor switching device becomes conductive during a switch-on operation

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+A2:2011
3.1.14.4.1
defined-point switching (of a semiconductor controller)
ability of a semiconductor controller to permit the flow of current through the main circuit only
as from the instant the a.c. applied voltage (see 2.5.32 of IEC 60947-1) or alternatively the
a.c. control circuit voltage reaches a specified point on its wave form
This form of optimized switching may be used for rush-current damping or the "soft switching"
of transformers.
3.1.14.4.2
zero-point switching (of a semiconductor controller)
special form of defined point switching applicable only in the case of single pole
semiconductor controllers for non-motor loads
The transition from the OFF-state to the ON-state after application of the control signal in
such a way, that the semiconductor switching device becomes conductive at the instant a.c.
applied voltage (see 2.5.32 of IEC 60947-1) passes through zero
NOTE This type of operation is particularly suitable for resistive and incandescent light loads. It should not be
used for inductive or capacitive loads since the angular displacement between load current and driving voltage in
these loads would cause severe transient current peaks.
3.1.14.4.3
random point switching (of a semiconductor controller)
absence of the ability of a semiconductor controller to permit the flow of current through the
main circuit only as from the instant the a.c. applied voltage (see 2.5.32 of IEC 60947-1) or
alternatively the a.c. control circuit voltage reaches a specified point on its wave form
3.1.15
operating cycle (of a controller)
succession of operations from one state to the other and back to the first state
NOTE A succession of operations not forming an operating cycle is referred to as an operating series.
3.1.16
operating capability
under prescribed conditions, ability to perform a series of operating cycles without failure
3.1.17
overload current profile
current-time coordinate specifying the requirement to accommodate overload currents for a
period of time (see 5.3.5.1)
3.1.18
rating index
rating information organized in a prescribed format unifying rated operational current and the
corresponding utilization category, overload current profile, and th
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