IEC 60947-2:2006/AMD2:2013

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

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

General Information

• Status: Published
• Publication Date: 30-Jan-2013
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Drafting Committee: MT 9 - TC 121/SC 121A/MT 9
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 07-Jun-2016

Relations

• Amends: IEC 60947-2:2006 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
• Effective Date: 05-Sep-2023
• Revised: IEC 60947-2:2016 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60947-2 ®
Edition 4.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AMENDMENT 2
AMENDEMENT 2
Low-voltage switchgear and controlgear –
Part 2: Circuit-breakers
Appareillage à basse tension –
Partie 2: Disjoncteurs
IEC 60947-2:2006/A2:2013
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IEC 60947-2 ®
Edition 4.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AMENDMENT 2
AMENDEMENT 2
Low-voltage switchgear and controlgear –

Part 2: Circuit-breakers
Appareillage à basse tension –

Partie 2: Disjoncteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 29.130.20 ISBN 978-2-83220-578-5

– 2 – 60947-2 Amend. 2  IEC:2013
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/1796/FDIS 17B/1807/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• withdrawn,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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
_____________
CONTENTS
Delete the entry referring to Table 1.
1.1 Scope and object
Replace the existing item b)2) of this subclause by the following new item b)2):
2) operation and behaviour in case of overload and operation and behaviour in case of
short-circuit, including co-ordination in service (selectivity and back-up protection);

2 Definitions
2.17.1
over-current discrimination
Replace the existing term and definition by the following new term and definition, and delete
the source:
60947-2 Amend. 2  IEC:2013 – 3 –
over-current selectivity
co-ordination of the operating characteristics of two or more over-current protective devices such that,
on the incidence of over-currents within stated limits, the device intended to operate within
these limits does so, while the other(s) does (do) not
2.17.2
total discrimination (total selectivity)
Replace the existing term by the following new term:
total selectivity
Replace in the existing definition the word “discrimination” by the word “selectivity”.
2.17.3
partial discrimination (partial selectivity)
Replace the existing term by the following new term:
partial selectivity
Replace in the existing definition the word “discrimination” by “selectivity”.

Renumber the existing definition 2.21, added by Amendment 1, as definition 2.22.
Add, after 2.20, the following new definition 2.21:
2.21
overload current setting
I
r
current setting of an adjustable overload release
NOTE In case of a non-adjustable overload release, this value is equal to nominal current I .
n
4.3.1.1 Rated operational voltage (U )
e
This correction does not apply to the English version.
)
4.3.5.1 Rated short-circuit making capacity (I
cm
This correction does not apply to the English version.
4.3.5.2 Rated short-circuit breaking capacities
This correction does not apply to the English version.
)
4.3.5.2.1 Rated ultimate short-circuit breaking capacity (I
cu
This correction does not apply to the English version.
)
4.3.5.2.2 Rated service short-circuit breaking capacity (I
cs
Replace the text of the existing subclause, including Table 1, by the following new text:
The rated service short-circuit breaking capacity of a circuit-breaker is the value of service
short-circuit breaking capacity (see 2.15.2) assigned to that circuit-breaker by the
manufacturer for the corresponding rated operational voltage, under the conditions specified
in 8.3.4. It is expressed as a value of prospective breaking current, in kA, or as a % of I
cu
(for example I = 25 % I ).
cs cu
– 4 – 60947-2 Amend. 2  IEC:2013
I shall be at least equal to 25 % of I .
cs cu
Table 1 (void)
Table 4 – Selectivity categories
Replace the existing text of note 2 by the following new text:
NOTE 2 Vacant.
5.2 Marking
This correction does not apply to the English version.
Add, at the end of the existing item b), the following two new bulleted items:
• range of the current setting (I ) of adjustable overload release (see 4.7.3);
r
• value or range of the rated instantaneous short-circuit current setting (I ), fixed or
i
adjustable (see 4.7.3).
This correction does not apply to the English version.
Add, at the end of the existing item c), the following new bulleted items:
• minimum cable cross-section, if different from Table 9 of IEC 60947-1, for ratings ≤ 20 A
according to rated ultimate short-circuit breaking capacity I ;
cu
• values of tightening torque for the circuit-breaker terminals.

7.1.5 List of construction breaks
Replace the first dashed item by the following new dashed item:
– material, finish and dimensions of internal current-carrying parts, admitting, however, the
variations listed in a), b), c), f) and g) below;
Replace the item f) introduced by Amendment 1 by the following new item f):
f) in the case of the 2-pole and 4-pole variants, replacement of the trip unit in one pole by a
link, to provide an unprotected neutral;
Add, at the end of the existing list, the following new item g):
g) creating a 2-pole breaker from a 3-pole breaker by removing the centre current path.

8.3.1.2 Tests omitted from sequence I and made separately
Replace, in this subclause introduced by Amendment 1, the existing first dashed item by the
following new dashed item:
– tripping limits and characteristics (8.3.3.1); in which case the sample(s) tested in the
sequence shall be subjected to the tests of 8.3.3.1.3, only on the phase poles at the
maximum setting, at room temperature and without the additional test of item b) to verify
the time-current characteristic;

60947-2 Amend. 2  IEC:2013 – 5 –

8.3.1.4 Alternative test programmes for circuit-breakers having both three-pole and
four-pole variants
Replace the existing title and text of this subclause, introduced by Amendment 1, including
Table 9b and Table 9c, by the following new title, text and Table 9b, Table 9c:
8.3.1.4 Alternative test programmes for circuit-breakers of a given frame size and
design having a different number of poles
These alternative test programmes may only be applied when all ratings are the same or
lower than the variant submitted to the full programme of Table 9, and construction breaks are
the same for all variants. In the case of 1-pole circuit-breakers the voltage ratings shall be
equal to or lower than the line-to neutral voltage of the variant tested to Table 9. A 2-pole
circuit-breaker produced by removing the centre current path from a 3-pole circuit-breaker
tested to Programme 1 or Programme 2 of this clause need not be tested as it is considered
to be covered by the tests on the 3-pole variant.
Compliance with the test requirements is met by carrying out one of the alternative
programmes 1 or 2 below.
– Programme 1: The applicable test sequences according to Table 9 shall be carried out
on the three-pole variant. In addition, where applicable, the tests or test sequences listed
in Table 9b shall be carried out on the other variants.
– Programme 2: The applicable test sequences according to Table 9 shall be carried out
on the four-pole variant. In addition, where applicable, the tests or test sequences listed in
Table 9c shall be carried out on the other variants.
The principle for the application of the alternative test programmes is illustrated below:
Programme 1 Programme 2
1-pole 2-poles 3-poles 4-poles 1-pole 2-poles 3-poles 4-poles
a
Construction 1
     
 
Construction 2
- -  - - -
 
Construction 3
- -  - - -
 
...
- -  - - -
 
Construction n
- -   - - - 
NOTE
 fully tested per Table 9
 tested per Table 9b
 tested per Table 9c
- no test required
a
construction 1 is the construction which covers the max rating.

– 6 – 60947-2 Amend. 2  IEC:2013
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
Test Test clause Test Applicability to Applicability to
,
f h
sequence 1-pole or 2-pole
4-pole variant
g
variants
8.3.3.1 Test of tripping limits and characteristics
8.3.3.1.1 General X X
a e
8.3.3.1.2 Short-circuit releases X X
k
8.3.3.1.3a) Overload releases:
−instantaneous/definite time-delay X
or
k e
8.3.3.1.3b) X
−inverse time-delay
X
(as
applicable)
8.3.3.1.4 Additional test for definite time-delay releases:
8.3.3.2 Dielectric properties X X
8.3.3.3 Mechanical operation and operational performance capability
I
8.3.3.3.1 General X X
d d, e
8.3.3.3.2 Construction and mechanical operation X X
8.3.3.3.3 Operational performance capability without current X X
8.3.3.3.4 Operational performance capability with current X X
8.3.3.3.5 Withdrawable circuit-breakers X
8.3.3.4 Overload performance X X
8.3.3.5 Verification of dielectric withstand X X
8.3.3.6 Verification of temperature-rise X X
8.3.3.7 Verification of overload releases
8.3.3.8 Verification of undervoltage and shunt releases X X
8.3.3.9 Verification of the main contact position X X
II 8.3.4 Rated service sho
...