IEC 60934:2000/AMD2:2013

IEC 60934 ®
Edition 3.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Circuit-breakers for equipment (CBE)

Disjoncteurs pour équipement (DPE)

IEC 60934:2000/A2:2013
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IEC 60934 ®
Edition 3.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Circuit-breakers for equipment (CBE)

Disjoncteurs pour équipement (DPE)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX J
ICS 29.120.40; 29.120.50 ISBN 978-2-83220-527-3

– 2 – 60934 Amend. 2 © IEC:2013

FOREWORD
This amendment has been prepared by subcommittee 23E: Circuit-breakers and similar

equipment for household use, of IEC technical committee 23: Electrical accessories.

The text of this amendment is based on the following documents:

FDIS Report on voting
23E/767/FDIS 23E/774/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• withdrawn,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.
_____________
1 Scope
Replace the entire existing text by the following:
This International Standard is applicable to mechanical switching devices designed as "circuit-
breakers for equipment" (CBE) for household and similar applications. CBEs according to this
standard are intended to provide protection to circuits within electrical equipment including its
components (e.g. motors, transformers, internal wiring). This standard covers also CBEs

applicable for protection of electrical equipment in case of undervoltage and/or overvoltage.
This standard also covers CBEs which are suitable for isolation.
NOTE The term "equipment" includes appliances.
CBEs are not applicable for overcurrent protection of wiring installations of buildings.
CBEs according to this standard have:
– a rated voltage not exceeding 440 V a.c. (between phases) and/or d.c. not exceeding
250 V;
– a rated current not exceeding 125 A;
– a short-circuit capacity (I ) of at least 6xI (a.c types) and 4xI (d.c.-types) but not
cn n n
exceeding 3 000 A.
60934 Amend. 2 © IEC:2013 – 3 –

CBEs may have a conditional short-circuit current rating in association with a specified short-

circuit protective device (SCPD). A guide for coordination of a CBE associated in the same

circuit with a SCPD is given in Annex F.

For CBEs having a degree of protection higher than IP20 according to IEC 60529, for use in

locations where hazardous environmental conditions prevail (e.g. excessive humidity, heat or

cold or deposition of dust) and in hazardous locations (e.g. where explosions are liable to

occur), special constructions may be required.

This standard contains all the requirements necessary to ensure compliance with the

operational characteristics required for these devices by type tests. It also contains the details

relative to test requirements and methods of testing necessary to ensure reproducibility of test
results.
This standard states:
a) the characteristics of CBEs;
b) the conditions with which CBEs shall comply, with reference to:
1) their operation and behaviour in normal service;
2) their operation and behaviour in case of overload;
3) their operation and behaviour in case of short-circuits up to their rated short-circuit
capacity;
4) their dielectric properties;
c) the tests intended for confirming that these conditions have been met and the methods to
be adopted for the tests;
d) the data to be marked on the devices;
e) the test sequences to be carried out and the number of samples to be submitted for
certification purposes (see Annex C);
f) the routine tests to be carried out to reveal unacceptable variations in material or
manufacture, likely to affect safety (see Annex J).
3 Terms and definitions
3.1.2
circuit-breaker for equipment (CBE)
Add, after the existing definition, a new note as follows:
NOTE These CBEs are intended for:

– automatic interruption and non-automatic or automatic resetting;
– automatic interruption and non-automatic or automatic resetting and manual switching operation.
3.1.3
E-type CBE
Delete the existing definition – introduced by Amendment 1 – and replace by the following
text:
"void"
4.5.3 E-type CBEs
Delete the existing subclause.

– 4 – 60934 Amend. 2 © IEC:2013

5.2.5 Rated conditional short-circuit current (I ) (optional)
nc
Delete, in the title, “(optional)” – text introduced by Amendment 1.

Replace the existing text of the subclause by the following:

The value of the conditional short-circuit current (see 3.11.5) if assigned to the CBE by the

manufacturer.
Renumber the existing note as "NOTE 1".

Add a new “NOTE 2”, as follows:
NOTE 2 The manufacturer can decide not to assign a value of I to the CBE, in which case the relevant tests are
nc
omitted.
5.2.5.1 Rated conditional short-circuit current performance category PC1 (I )
nc1
(optional) (see 9.12.4.2)
Delete, in the title, “(optional)” – text introduced by Amendment 1.
Replace the existing text of the subclause by the following:
The value of rated conditional short-circuit current, if assigned by the manufacturer, for which
the prescribed conditions do not include the fitness of the CBE for its further use.
5.2.5.2 Rated conditional short-circuit current, performance category PC2 (I )
nc2
(optional) (see 9.12.4.3)
Delete, in the title, “(optional)”.
Replace the existing text of the subclause by the following:
The value of rated conditional short-circuit current, if assigned by the manufacturer, for which
the prescribed conditions do include the fitness of the CBE for its further use.

8.5.1 Standard time-current zone
Replace the existing text of the listed items in the fourth paragraph by the following:

– the test currents indicated in Table 9, as multiples of the rated current;
– the times (t , t , t , t ) indicated in Table 9, where applicable.
1 2 3 4
Table 9 – Time-current operating characteristics
Delete the following line in Table 9:
b a
mI  Cold  t ≤ t ≤ t Tripping
n 5 6
b
Delete footnote .
60934 Amend. 2 © IEC:2013 – 5 –

8.6 Electrical performance
Add at the end of the title:
"and behaviour at rated short-circuit capacity".

Table 11 – Test conditions for electrical performance for CBEs intended for general use,

including inductive circuits
Replace the existing section 3 – modified by Amendment 1 – by a new section 3.1, and add a
c
footnote , as follows:
c c
6 I 4 I
n n
6 I
n 4 I
n
Rated
0,93 to
< I ≤ 2 to 3
short- < I ≤ cn
0,98
cn
M, S, R, 300 to
1 000 A
3.1 circuit 3 1,05 U 1 500 A
e
J 360
capacity
1 000 A
I 1 500 A
cn
0,85 to
4 to 6
< I ≤
cn < I ≤
0,9
cn
3 000 A
3 000 A
c
Test is covered by section 2
d
Add, after the new section 3.1, a new section 3.2 and a footnote , as follows:
Test 0,93 to
6 I – –
n
verifying 105 % of 0,98
the the rated
M, S, R, 300 to
d
3.2 suitability 2 voltage
J 360 I > 6 I :
cn n 0,93 to
for use in upper
– –
0,98
IT value
1,2 × I
i
systems
d
Only relevant for CBEs marked with e.g. 230/400, 120/240, …

Table 12 – Test conditions for electrical performance of CBEs
used in essentially resistive circuits only (see Clause 6, item d))
c
Replace the existing section 3 by a new section 3.1, and add a footnote , as follows:

c c
6 I  4 I
n n
4 I
n
Rated
1 to 2
short- < I ≤ 1
cn
M, S, R, 300 to 6 I
n
3.1 circuit 3 1,05 U 000 A
e 0,93 to
J 360
capacity
< I ≤
0,98
cn
1 000 A
I
3 000 A
cn
2 to 3
< I ≤ 3
cn
000 A
c
Test is covered by section 2
– 6 – 60934 Amend. 2 © IEC:2013

d
Add, after the new section 3.1, a new section 3.2, and a footnote , as follows:

Test 6 I 0,95 to 1 - -
n
verifying 105 % of
the the rated
M, S, R, 300 to
d
3.2 suitability 2 voltage I > 6 I :
cn n
J 360
0,95 to 1 - -
for use in upper
1,2 × I
IT value
i
systems
d
Only relevant for CBEs marked with e.g. 230/400, 120/240, etc.

9.7.2 Insulation resistance of the main circuit
Add, at the end of the existing item b), the following new sentence:
for the test between phases, electronic components connected to the main circuit may be
disconnected during the test;
9.11.4 Behaviour at rated short-circuit capacity
Delete the existing first sentence – text introduced by Amendment 1.
Add the following new subclause and move the existing text of 9.11.4 into this new subclause:
9.11.4.1 Short circuit test for CBEs suitable for isolation
Add the following new subclause:
9.11.4.2 Short-circuit test on CBEs for verifying their suitability for use in IT systems
CBEs shall be tested in accordance with the values given in Table 11 or Table 12, section 3.2.
Single-pole CBEs and each protected pole of multipole CBEs are subjected individually to a
test in a circuit the connections of which are shown in Figure 3.
The impedance Z (see Figure 3) is adjusted so as to obtain a current as given in Table 11 or
Table 12, section 3.2.
The sequence of operations shall be
O – t – CO
For the O operation on the first protected pole the auxiliary switch A is synchronised with
respect to the voltage wave so that the circuit is closed on the point 0° on the wave for this
operation. For the following O operations on the other protected poles to be teste
...