IEC 60947-4-3:1999/AMD2:2011

Amendment 2 - Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC semiconductor controllers and contactors for non-motor loads

Amendement 2 - 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

General Information

• Status: Published
• Publication Date: 13-Mar-2011
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 07-May-2014

Relations

• Revised: IEC 60947-4-3:2014 - Low-voltage switchgear and controlgear - Part 4-3: Contactors and motor-starters - AC semiconductor controllers and contactors for non-motor loads
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60947-4-3
®

Edition 1.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2


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

IEC 60947-4-3:1999/A2:2011

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60947-4-3
®

Edition 1.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2


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
INTERNATIONALE PRICE CODE
J
CODE PRIX
ICS 29.130.20 ISBN 978-2-88912-409-1

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 60947-4-3 Amend. 2  IEC:2011
FOREWORD
This amendment has been prepared by subcommittee 17B: Low-voltage switchgear and
controlgear, of IEC technical committee 17: Switchgear and controlgear.
The text of this amendment is based on the following documents:
FDIS Report on voting
17B/1727/FDIS 17B/1735/RVD

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base 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.
_____________
Changes to be made to IEC 60947-4-3:1999:
5.3.1.1 Rated operational voltage (U )
e
Replace, in IEC 60947-4-3:1999, the existing text of this subclause by the following:
Subclause 4.3.1.1 of IEC 60947-1 applies with the following addition.
The rating of a.c. equipment shall include the number of phases except that the rating of
equipment obviously intended for single-phase use only is not required to include the number
of phases.

6.1 Nature of information
Replace, in IEC 60947-4-3:1999, the existing text of item f) by the following:
f) either the value of the rated frequency 50 Hz/60 Hz,
or other rated frequencies for example 16 2/3 Hz, 400 Hz;

6.2 Marking
Modify, in IEC 60947-4-3:1999, the existing text of the second and third paragraphs as
follows:
Data under d) to u) in 6.1 shall be included on the nameplate, or on the equipment, or in the
manufacturer's published literature.

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60947-4-3 Amend. 2  IEC:2011 – 3 –
Data under c) and l) in 6.1 shall preferably be marked on the equipment.

8.2.2.8 Other parts
Replace, in IEC 60947-4-3:1999, the existing text by the following:
Subclause 7.2.2.8 of IEC 60947-1 applies, replacing words “plastics and insulating materials”
with “insulating parts”.

8.3.2.1.1 Harmonics
Replace, in IEC 60947-4-3:1999, the existing text of this subclause by the following:
Subclause 7.3.3.2.2 of IEC 60947-1 applies with the following addition:
Because no significant harmonic emission are produced in the FULL-ON state, tests are not
required on those controllers or contactors which run only in the FULL-ON state or which are
by-passed by a mechanical switching device after completing a start.

9.1.5 Special tests
Replace, in IEC 60947-4-3:1999, the existing text of this subclause by the following:
Special tests comprise damp heat, salt mist, vibration and shock tests. For these tests,
Annex Q of IEC 60947-1 applies. The conditions of application are under consideration.

9.3.2 General test conditions
Replace, in IEC 60947-4-3:1999, the existing text of this subclause by the following:
Subclause 8.3.2 of IEC 60947-1 applies with the following addition.
Except for devices specifically rated for only one frequency, tests performed at 50 Hz cover
60 Hz applications and vice-versa.
The selection of samples to be tested for a series of devices with the same fundamental
design and without a significant difference in construction shall be based on engineering
judgement.
Unless otherwise specified in the relevant test clause, the clamping torque for connections
shall be that specified by the manufacturer or, if not specified, the torque given in Table 4 of
IEC 60947-1.
In the case where several heat sinks are specified, the one which has the higher thermal
resistance shall be used.
True r.m.s. voltage and current measuring means shall be used.

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– 4 – 60947-4-3 Amend. 2  IEC:2011
9.3.3.4.1 Type tests
5) Power-frequency withstand verification after humidity treatment
Replace, in IEC 60947-4-3:1999, the existing title and text of this paragraph as follows:
5) Vacant

9.3.4.1.1 General requirements for short-circuit tests
Replace, in IEC 60947-4-3:1999, the existing text of this subclause by the following:
The general requirements of 8.3.4.1.1 of IEC 60947-1 apply with the following modification.
The enclosure shall be in accordance with the manufacturer’s specifications. In the case
where multiple enclosure options are provided, the enclosure with the smallest volume shall
be taken.
If devices tested in free air may also be used in enclosures, they shall be additionally tested
in the smallest of such enclosures stated by the manufacturer. For devices tested only in free
air, information shall be provided to indicate that they are not suitable for use in an individual
enclosure.

9.3.4.1.1 Test at the rated conditional short-circuit current at I
q
Replace, in the second paragraph of IEC 60947-4-3:1999, “figure 3 of IEC 60269-1” by “figure
4 of IEC 60269-1”.

9.3.5.2.5 Harmonics and commutation notches
Replace, in IEC 60947-4-3:1999, the existing text of this subclause by the following:
No requirements, the test levels are under study for the future.

9.3.6.2 Operation and operating limits
Replace, in IEC 60947-4-3:1999, the existing text of the third paragraph of this subclause by
the following:
The 2 following tests shall be made.
a) Functionality shall be verified by a blocking and commutating capability test according to
Table 7.
Two operating cycles are required, one at 85 % U with 85 % U , and one at 110 % Ue
e s
with 110 % U . No loss of functionality as specified by the manufacturer is permitted.
s
b) It shall be verified that the equipment operates according to the requirements of 8.2.1.5.

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60947-4-3 Amend. 2  IEC:2011 – 5 –
Changes to be made to Amendment 1:2006:
2 Normative references
Delete, in Amendment 1:2006, the footnotes of this clause.

Replace, in Amendment 1:2006, the reference to IEC 60085:2004 by the following:
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation

Replace, in Amendment 1:2006, the reference to IEC 60947-1:2004 by the following:
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules

Replace in Amendment 1:2006, the references to IEC 61000-3-2:2000 and its Amendments 1
and 2 by the following:
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)

Replace, in Amendment 1:2006, the reference to IEC 61000-4-3:2002 and its Amendment 1
by the following:
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)

Replace, in Amendment 1:2006, the references to IEC 61000-4-6:2003 and its Amendments 1
and 2 by the following:
IEC 61000-4-6:2008, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
Delete in Amendment 1:2006, the reference to IEC 61131-2:2002.

Replace, in Amendment 1:2006, the references to CISPR 11:2003 and its Amendment 1, by
the following:

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– 6 – 60947-4-3 Amend. 2  IEC:2011
CISPR 11:2009, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
Amendment 1 (2010)

5.6 Auxiliary circuits
Replace, in Amendment 1:2006, the existing paragraph by the following new text:
Digital inputs and/or digital outputs contained in controllers and contactors, and intended to
be compatible with PLCs, shall fulfil the requirements of Annex S of IEC 60947-1.

8.2.2 Temperature rise
Replace, in Amendment 1:2006, the existing text of the first paragraph by the following:
The requirements of 7.2.2 of IEC 60947-1 apply to controllers and contactors in a clean, new
condition.
NOTE Contact resistance due to oxidation may impact the temperature rise test at test voltages below 100 V. In
the case of conducting the test at a voltage below 100 V, mechanical switching devices may have the contacts
cleaned either by any non-abrasive method or by carrying out operating cycles with or without load several times
prior to initiating the test at any voltage.

Changes to be made to both IEC 60947-4-3:1999 and Amendment 1:2006:
2 Normative references
Delete in Amendment 1:2006 the reference to Amendment 1 of IEC 60269-1 and replace, in
IEC 60947-4-3:1999, the reference to IEC 60269-1:1998 by the following:
IEC 60269-1:2006, Low-voltage fuses – Part 1: General requirements

Delete in Amendment 1:2006 the references to Amendments 1 and 2 of IEC 61000-4-2 and
replace, in IEC 60947-4-3:1999 the reference to IEC 61000-4-2:1995 by the following:
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test

Delete in Amendment 1:2006 the references to Amendments 1 and 2 of IEC 61000-4-4 and
replace, in IEC 60947-4-3:1999, the reference to IEC 61000-4-4:1995 by the following:
IEC 61000-4-4:2004, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
Amendment 1 (2010)

Delete in Amendment 1:2006 the reference to Amendment 1 of IEC 61000-4-5 and replace, in
IEC 60947-4-3:1999, the reference to IEC 61000-4-5:1995 by the following:

---------------------- Page: 8 ----------------------
60947-4-3 Amend. 2  IEC:2011 – 7 –
IEC 61000-4-5:2005, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test

Delete in Amendment 1:2006 the reference to Amendment 1 of IEC 61000-4-11 and replace,
in IEC 60947-4-3:1999, the reference to IEC 61000-4-11:1994 by the following:
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests

8.1 Constructional requirements
Replace, in IEC 60947-4-3:1999, the whole Subclause 8.1, including 8.1.3 of Amendment
1:2006, by the following:
8.1.1 General
Subclause 7.1.1 of IEC 60947-1 applies.
8.1.2 Materials
8.1.2.1 General materials requirements
Subclause 7.1.2.1 of IEC 60947-1 applies.
8.1.2.2 Glow wire testing
Subclause 7.1.2.2 of IEC 60947-1 applies with the following addition.
When tests on the equipment or on sections taken from the equipment are used, parts of
insulating materials necessary to retain current-carrying parts in position shall conform to the
glow-wire tests in 8.2.1.1.1 of IEC 60947-1 at a test temperature of 850 °C.
8.1.2.3 Test based on flammability category
Subclause 7.1.2.3 of IEC 60947-1 applies.
8.1.3 Current-carrying parts and their connections
Subclause 7.1.3 of IEC 60947-1 applies.
8.1.4 Clearances and creepage distances
Subclause 7.1.4 of IEC 60947-1 applies with the following note.
NOTE The nature of a semiconductor makes it unsuitable for use for isolation purposes.
8.1.5 Actuator
Vacant
8.1.6 Indication of the contact position
Vacant

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