Amendment 1 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers

Amendement 1 - Appareillage à basse tension - Partie 2: Disjoncteurs

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Published
Publication Date
07-Jul-2019
Current Stage
PPUB - Publication issued
Completion Date
08-Jul-2019
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IEC 60947-2:2016/AMD1:2019 - Amendment 1 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
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IEC 60947-2
Edition 5.0 2019-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
IEC 60947-2: 2016-06/AMD1:2019-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60947-2
Edition 5.0 2019-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-6997-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60947-2:2016/AMD1:2019
© IEC 2019
FOREWORD

This amendment has been prepared by subcommittee 121A: Low-voltage switchgear and

controlgear, of IEC technical committee 121: Switchgear and controlgear and their assemblies

for low voltage.
The text of this amendment is based on the following documents:
FDIS Report on voting
121A/286/FDIS 121A/302/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 website 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• withdrawn,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.
_____________
1.1 Scope and object
Replace the existing first paragraph by the following:

This part of IEC 60947 series applies to circuit-breakers, intended to be installed and

operated by instructed or skilled persons, the main contacts of which are intended to be

connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.;

it also contains additional requirements for integrally fused circuit-breakers.
Replace the 16 existing paragraph by the following:

For certain specific applications (for example traction, rolling mills, marine service,

downstream of variable frequency drives, use in explosive atmospheres), particular or

additional requirements may be necessary.
1.2 Normative references

Replace the existing references to IEC 61000-4-2, IEC 61140, and CISPR 11 by the following

new references:
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test

IEC 61140:2016, Protection against electric shock – Common aspects for installation and

equipment
---------------------- Page: 4 ----------------------
IEC 60947-2:2016/AMD1:2019 – 3 –
© IEC 2019

CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance

characteristics – Limits and methods of measurement
CISPR 11:2015/AMD1:2016

Delete the existing references to IEC 60364 (all parts), IEC 61000-3-2, IEC 61000-3-3 and

CISPR 22.
Add the following new normative references to the existing list:
IEC 60228, Conductors of insulated cables

IEC 61545, Connecting devices – Devices for the connection of aluminium conductors in

clamping units of any material and copper conductors in aluminium bodied clamping units

CISPR 32:2015, Electromagnetic compatibility of multimedia equipment – Emission
requirements
Add, after the existing definition 2.22, the following new definition:
2.23
closing release
closing coil

release, energized by a source of voltage, which triggers the closing of the circuit-breaker

Note 1 to entry: A closing release is an auxiliary device of the circuit-breaker, and is different from the "closing

device" mentioned in the figures of Annex A, and in IEC 60947-1, which is part of the test setup and is intended to

establish the short-circuit current.
4.7.1 Types
Renumber existing item "4) other releases." to item "5) other releases.".
Add new item "4) closing release;".
4.7.2 Characteristics

Change existing item 1) to read "1) shunt release and undervoltage release (for opening), and

closing release:", keeping dashed items unchanged.
5.2 Marking

Replace the existing text, including all lettered items, by the following new text and Table 13:

Each circuit-breaker shall be marked in a durable manner; data to be provided and

corresponding locations are indicated in Table 13.
---------------------- Page: 5 ----------------------
– 4 – IEC 60947-2:2016/AMD1:2019
© IEC 2019
Table 13 – Product information
Item Information Marking
location
1.1 rated current (I ) Visible
1.2 Visible

suitability for isolation, if applicable, with the symbol (IEC 60617-S00288:2001-07

combined with IEC 60617-S00219:2001-07)

1.3 indication of the open and closed position with O (IEC 60417-5008;2002-10) and I Visible

(IEC 60417-5007;2002-10) respectively, if symbols are used (see 7.1.6.1 of IEC 60947-

1:2007)
2.1 manufacturer’s name or trade mark Marked
2.2 type designation or catalogue reference Marked
2.3 IEC 60947-2, if the manufacturer claims compliance with the standard Marked
2.4 selectivity category A or B Marked

2.5 rated operational voltage(s) U (see 4.3.2.1 and, where applicable, Annex H) Marked

2.6 Marked

unsuitability for IT systems, if applicable, with the symbol (IEC 60417-6363:2016-07)

2.7 rated impulse withstand voltage (U ) Marked
imp

2.8 value (or range) of the rated frequency, and/or the indication "d.c." (or the symbol Marked

(IEC 60417-5031:2002-10))

2.9 rated service short-circuit breaking capacity (I ) at the corresponding rated voltage (U ) Marked

cs e

2.10 rated ultimate short-circuit breaking capacity (I ) at the corresponding rated voltage (U ) Marked

cu e

2.11 rated short-time withstand current (I ), and associated short-time delay, for selectivity Marked

category B
2.12 range of the current setting (I ) of the adjustable overload release
Marked

2.13 range of the rated instantaneous short-circuit current setting (I ), for adjustable releases

Marked

2.14 reference temperature for non-compensated thermal releases, if different from 30 °C Marked

2.15 terminals identification, according to 7.1.8.4 of IEC 60947-1:2007 Marked
2.16 line and load terminals, if applicable Marked
2.17 neutral pole terminals, if applicable, by the letter N Marked
2.18 protective earth terminal, where applicable, by the symbol Marked
(IEC 60417-5019:2006-08)
(see 7.1.10.3 of IEC 60947-1:2007)

3.1 rated short-circuit making capacity (I ), if higher than that specified in 4.3.6.1 Literature

3.2 rated insulation voltage (U ), if higher than the maximum rated operational voltage Literature

3.3 pollution degree if other than 3 Literature

3.4 conventional enclosed thermal current (I ) if different from the rated current Literature

the

3.5 IP code, where applicable (see Annex C of IEC 60947-1:2007/AMD1:2010) Literature

3.6 minimum enclosure size and ventilation data (if any) to which marked ratings apply Literature

3.7 details of minimum distance between circuit-breaker and earthed metal parts for circuit- Literature

breakers intended for use without enclosures

3.8 suitability for environment A or environment B per Annex J, as applicable Literature

3.9 RMS sensing, if applicable, in accordance with F.4.1.1 Literature

3.10 minimum cable cross-section, if different from Table 9 of IEC 60947-1:2007, for ratings Literature

≤ 20 A according to rated ultimate short-circuit breaking capacity I
3.11 values of tightening torque for the circuit-breaker terminals Literature
---------------------- Page: 6 ----------------------
IEC 60947-2:2016/AMD1:2019 – 5 –
© IEC 2019
Item Information Marking
location
3.12 current derating for terminals and connections, if applicable Literature

4.1 for closing releases (see 2.23) and/or motor-operators, rated control circuit voltage, kind of Aux

current and rated frequency for a.c.

4.2 rated control circuit voltage of the shunt release and/or of the under-voltage release (or of Aux

the no-voltage release), kind of current and rated frequency for a.c.
4.3 rated current of indirect over-current releases Aux

4.4 number and type of auxiliary contacts, rated operational currents at the rated operational Aux

voltages, and rated frequency for a.c.
Key

Visible: visible from the front when the circuit-breaker is installed as in service and the actuator is

accessible
Marked: marked on the circuit-breaker
Literature: provided in the manufacturer's literature

Aux: marked on the auxiliaries or on the circuit-breaker, if marking space is sufficient; additionally, data

shall be made available in the manufacturer's literature

Where applicable, I and I ranges may be displayed instead of being marked on the circuit-breaker.

r i
5.3 Instructions for installation, operation and maintenance
Replace the existing text by the following new text:
Subclause 5.3 of IEC 60947-1:2007/AMD2:2014 applies with the following addition:

Additional information for the decommissioning and dismantling of the circuit-breaker shall be

provided to the user in the case of a foreseeable hazardous condition, for example due to

stored energy or hazardous substances.
7.1.1 General
Replace the existing text by the following new text:
Subclause 7.1 of IEC 60947-1:2007/AMD1:2010/AMD2:2014 applies with the following
modifications:

The requirements of 7.1.2 of IEC 60947-1:2007/AMD1:2010/AMD2:2014 do not apply to parts

with a mass lower than 2 g (insignificant mass, in accordance with 3.14 of

IEC 60695-2-11:2014). For products containing a plurality of small parts, the total mass of

non-tested parts located in close proximity to each other shall not exceed 10 g. Proximity shall

be based on engineering judgment that takes into consideration the risk of propagation of fire.

Where, in 7.1.2.2 of IEC 60947-1:2007/AMD1:2010/AMD2:2014, the test temperature is to be

specified, the value required by this document for the parts necessary to retain in position

current-carrying parts is:
– 960 °C for the main circuit;
– 850 °C for the other circuits.
7.2.2.3 Main circuit
Replace the existing text by the following new text:
---------------------- Page: 7 ----------------------
– 6 – IEC 60947-2:2016/AMD1:2019
© IEC 2019

The main circuit of a circuit-breaker, including the over-current releases that may be

associated with it, shall be capable of carrying its rated current I , under the conditions of

Clause 8, without the temperature rises exceeding the limits specified in Table 7.

8.3 Type tests
Replace the last existing paragraph by the following new paragraph:

In order to facilitate locating a particular test condition or test, an alphabetical index is given

below, using the terms most likely to be used (not necessarily the exact terms appearing in

the relevant subclause heading).

8.3.1.3 Applicability of sequences according to the relationship between short-circuit

ratings

Replace, in the alphabetical index of tests, in line "Overload releases (verification)", reference

"8.3.4.5" by "8.3.4.6".
Table 9 – Overall schema of test sequences

Replace, in test sequence IV row, the existing text of 2 column by the following new text:

Circuit-breakers of selectivity category B and circuit-breakers of selectivity category A with

an assigned short-time withstand current (see 4.4)

Table 9b – Applicability of tests or test sequences to 1, 2 and 4-pole circuit-breakers

according to the alternative programme 1 of 8.3.1.4
Replace the existing text of the table footnote " " by the following new text:
Test at maximum kVA rating (I × corresponding U ).
cu e

Table 9c – Applicability of tests or test sequences to 1, 2 and 3-pole circuit-breakers

according to the alternative programme 2 of 8.3.1.4
Replace the existing text of the table footnote " " by the following new text:
Test at maximum kVA rating (I × corresponding U ).
cu e
8.3.2.1 General requirements

Replace the existing second paragraph after the note by the following new paragraph:

For the tests in free air concerning overload performance, short-circuit, and short-time

withstand current where applicable, a metallic screen shall be placed on all sides of the

circuit-breaker in accordance with the manufacturer’s instructions. Details, including distances

of the metallic screen from the circuit-breaker, shall be stated in the test report.

Replace the existing fifth paragraph before Table 10 by the following:

The tightening torques to be applied to the terminal screws shall be in accordance with the

manufacturer's instructions (see Table 13, item 3.11).
Table 10 – Number of samples for test
“e”
Replace, in the existing table footnote , “test” by “testing.
---------------------- Page: 8 ----------------------
IEC 60947-2:2016/AMD1:2019 – 7 –
© IEC 2019
8.3.2.5 Test conditions for temperature-rise tests
Replace the existing fifth paragraph by the following:

For four-pole circuit-breakers, a test shall first be carried out on the 3-phase poles; for the

neutral pole, the additional single-phase test of 8.3.3.3.4 of IEC 60947-1:2007 applies only

when there is a construction break between the neutral pole and the phase poles (see 7.1.6),

in which case the test current is the rated current of the neutral pole.
8.3.2.6.4.2 Tests on one-, two- and three-pole circuit-breakers
Replace the existing title of this subclause by the following new title:
8.3.2.6.4.2 Common tests on one-, two-, three- and four-pole circuit-breakers
8.3.2.6.4.3 Tests on four-pole circuit-breakers
Replace the existing title of this subclause by the following new title:
8.3.2.6.4.3 Additional tests on four-pole circuit-breakers
Delete the existing first paragraph.

Replace the existing second and third paragraphs by the following new paragraphs:

Additional sequences of operations on one or more new samples, in accordance with

Table 10, shall be carried out on the fourth pole and its adjacent pole, according to test

sequences III or V, as applicable, and test sequence IV if applicable. This requirement applies

even when test sequence III is replaced by test sequence II (I = I ) or test sequence IV is

cu cs

replaced by test sequence VI (I = I ), i.e., additional tests according to test sequence III or

cw cs
V, and test sequence IV, as applicable, are required.

Alternatively, at the request of the manufacturer, these tests may be combined with the tests

of 8.3.2.6.4.2 and made on the same samples, in which case the test in each relevant test

sequence shall comprise
– the test on three adjacent poles,
– the test on the fourth pole and the adjacent pole.
8.3.3.2.2 Short-circuit releases

Replace, in the existing fifth paragraph, third sentence, "indivudal" by "individual".

8.3.3.2.3 Overload releases
a) Instantaneous or definite time-delay releases
Replace, in the existing last paragraph, "(see 8.3.3.2.3)" by "(see 8.3.3.2.1)".
b) Inverse time-delay releases

Replace, in the existing second paragraph, "(see 8.3.3.2.4)" by "(see 8.3.3.2.1)".

Replace, in the existing third paragraph, "see 4.7.3 and 5.2 item b)" by "see 4.7.3 and

Table 13 item 2.14".
8.3.3.4.2.2 Mechanical operation

Replace, in the existing first dashed item, "closing device" with "closing release".

---------------------- Page: 9 ----------------------
– 8 – IEC 60947-2:2016/AMD1:2019
© IEC 2019
8.3.3.4.3 Operational performance capability without current

Replace, in the existing second sentence of the 7 paragraph, "closing devices" with "closing

releases".
8.3.3.4.4 Operational performance capability with current

Replace, in the existing second sentence of the 6 paragraph, "closing devices" with "closing

releases".
8.3.3.6.2 Test voltage
Replace the existing first paragraph with the following:
Subclause 8.3.3.4.1, item 4) b), of IEC 60947-1:2007/AMD1:2010 applies.
Delete the existing second paragraph.

8.3.6.5 Test of short-circuit breaking capacity at the maximum short-time withstand

current
Add at the end of the existing last paragraph, the following new sentence:

"; this exception also applies to the test on the fourth pole and the adjacent pole, in

accordance with 8.3.2.6.4.3."
Annex A – Co-ordination between a circuit-breaker and another short-circuit
protective device associated in the same circuit
A.1 General
Add, in last but two existing paragraph, a closing bracket “)” after “2.17.3”.

Figure A.4 – Example of test circuit for conditional short-circuit breaking capacity tests

showing cable connections for a 3-pole circuit-breaker (C )
Replace the existing figure by the following new figure:
---------------------- Page: 10 ----------------------
IEC 60947-2:2016/AMD1:2019 – 9 –
© IEC 2019
Replace, the existing first paragraph by the following new text:

Adjustable loads L and R may be located either on the high voltage side or on the low

voltage side of the supply circuit.
Figure A.5 – Example of test circuit for the verification of selectivity
Replace, the existing first paragraph by the following new text:

Adjustable loads L and R may be located either on the high voltage side or on the low

voltage side of the supply circuit.
Annex B – Circuit-breakers incorporating residual current protection
Replace the existing annex by the following new annex:
---------------------- Page: 11 ----------------------
– 10 – IEC 60947-2:2016/AMD1:2019
© IEC 2019
Annex B
(normative)
Circuit-breakers incorporating residual current protection
B.1 General
B.1.1 Preamble

To provide protection against the effects of electric shock hazards, devices reacting to

residual differential currents are used as protective systems. Such devices are frequently

used in conjunction with or as an integral part of a circuit-breaker to achieve a two-fold goal,

i.e.:

– providing protection of installations against overloads and short-circuit currents;

– providing protection of persons against indirect contact, i.e. hazardous increases of

ground potential due to defective insulation.

NOTE 1 In IEC 61140:2016, the term “protection of persons against indirect contact” is replaced by “fault

protection”.

Residual current devices may also provide additional protection against fire and other

hazards, which may develop as a result of an earth fault of a lasting nature that cannot be

detected by the over-current protective device.

Residual current devices having a rated residual current not exceeding 30 mA are also used

as a means for additional protection against direct contact in the event of failure of the

relevant protective means.

NOTE 2 In IEC 61140:2016, the term “protection of persons against direct contact” is replaced by “basic

protection”.

The requirements for the installation of such devices are specified in various sections of

IEC 60364 series.

This annex includes definitions, additional requirements and tests for circuit-breakers

incorporating residual current protection of type B to cover the use of new electronic

technology in equipment which can result in particular residual currents not covered by the

characteristics of type AC or type A.
NOTE 3 This annex complies with the relevant requirements of IEC 60755.
B.1.2 Scope and object

This annex applies to circuit-breakers providing residual current protection (CBRs). It covers

the requirements for units that concurrently perform residual current detection, compare such

measurements with a preset value and cause the protected circuit to be switched off when

this value is exceeded.
This annex applies to:

• circuit-breakers in accordance with this document, which incorporate the residual current

function as an integrated feature (hereinafter called integral CBRs);

• CBRs consisting of a combination of a residual current device (hereinafter referred to as

r.c. units) and a circuit-breaker in accordance with this document; their combination both

mechanically and electrically, may be carried out either at the factory or in the field by the

user in accordance with the manufacturer's instructions.
This annex covers CBRs of type AC, type A and type B (see B.4.4).
---------------------- Page: 12 ----------------------
IEC 60947-2:2016/AMD1:2019 – 11 –
© IEC 2019
This annex applies only to CBRs intended for use in a.c. circuits.

NOTE The neutral current sensing means, if any, can be external to the circuit-breaker or the combination,

depending on the case.

The residual current function of CBRs covered by this annex may or may not be functionally

dependent on line voltage. CBRs depending on an alternative supply source are not covered

by this annex.

This annex does not apply to equipment where the current sensing means (except the neutral

current sensing means) or the processing device are mounted separately from the circuit-

breaker. The requirements for such devices are given in Annex M.
The object of this annex is to state:
a) the specific features of the residual current function;
b) the specific requirements that shall be complied with by the CBR
– under normal circuit conditions;

– under abnormal circuit conditions, whether of a residual current nature or not;

c) the tests that shall be performed to verify compliance with the requirements in b) above,

together with the appropriate test procedures, including tests for electromagnetic

compatibility;
d) the relevant product information.
B.2 Terms and definitions

As a complement to Clause 2 of this document, the following terms and definitions apply:

B.2.1 Terms and definitions relating to currents flowing from live parts to earth

B.2.1.1
earth fault current
current flowing to earth due to an insulation fault
[SOURCE: IEC 60050-442:1998, 442-01-23]
B.2.1.2
earth leakage current

current flowing from the live parts of the installation to earth in the absence of an insulation

fault
[SOURCE: IEC 60050-442:1998, 442-01-24]
B.2.2 Terms and definitions relating to the energization of a CBR
B.2.2.1
energizing quantity

electrical energizing quantity that, alone or in combination with other such quantities, shall be

applied to a CBR to enable it to accomplish its function under specified conditions

B.2.2.2
energizing input-quantity

energizing quantity by which the CBR is activated when it is applied under specified

conditions

Note 1 to entry: These conditions can involve, e.g., the energizing of certain auxiliary elements.

---------------------- Page: 13 ----------------------
– 12 – IEC 60947-2:2016/AMD1:2019
© IEC 2019

[SOURCE: IEC 60050-442:1998, 442-05-58, modified – In the definition, "residual current

device" has been replaced with "CBR".]
B.2.2.3
residual current

vectorial sum of the currents flowing in the main circuit of the CBR, expressed as an r.m.s.

value

[SOURCE: IEC 60050-442:1998, 442-05-19, modified – The definition has been adapted to

apply to CBRs.]
B.2.2.4
residual operating current

value of the residual current which causes the CBR to operate under specified conditions

[SOURCE: IEC 60050-442:1998, 442-05-20, modified – In the definition, "residual current

device" has been replaced with "CBR".]
B.2.2.5
residual non-operating current
∆no

value of the residual current at which (and below which) the CBR does not operate under

specified conditions
[SOURCE: IEC 60050-442:1998, 442-05-21, modified – Symbol introduced and, in the
definition, "residual current device" has been replaced with "CBR".]
B.2.3 Terms and definitions relating to the operation and the functions of a CBR
B.2.3.1
circuit-breaker incorporating residual current protection
CBR

circuit-breaker (see 2.1) designed to cause the opening of the contacts when the residual

current attains a given value under specified conditions
B.2.3.2
CBR functionally independent of line voltage

CBR for which the functions of detection and evaluation, and the actuating means of

interruption (see B.2.3.6) do not depend on the line voltage
B.2.3.3
CBR functionally dependent on line voltage

CBR for which the functions of detection and/or evaluation, and/or the actuating means of

interruption (see B.2.3.6) depend on the line voltage

Note 1 to entry: It is understood that the line voltage for detection, evaluation or interruption is applied to the

CBR.
B.2.3.4
detection (of a residual current)
function consisting in sensing the presence of a residual current
Note 1 to entry: This function can be performed, for example,
...

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