IEC 62423:2007

INTERNATIONAL IEC
STANDARD
CEI
NORME
First edition
INTERNATIONALE
Première édition
2007-05
Type B residual current operated circuit-breakers
with and without integral overcurrent protection
for household and similar uses (Type B RCCBs
and Type B RCBOs)
Interrupteurs automatiques à courant différentiel
résiduel de Type B avec et sans protection contre
les surintensités incorporée pour usages
domestiques et analogues (ID et DD de Type B)

Reference number
Numéro de référence
IEC/CEI 62423:2007
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INTERNATIONAL IEC
STANDARD
CEI
NORME
First edition
INTERNATIONALE
Première édition
2007-05
Type B residual current operated circuit-breakers
with and without integral overcurrent protection
for household and similar uses (Type B RCCBs
and Type B RCBOs)
Interrupteurs automatiques à courant différentiel
résiduel de Type B avec et sans protection contre
les surintensités incorporée pour usages
domestiques et analogues (ID et DD de Type B)

PRICE CODE
U
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 62423 © IEC:2007
CONTENTS
FOREWORD.4

INTRODUCTION.6

1 Scope.7

2 Normative references .7

3 Terms and definitions .8

4 Classification.8

5 Characteristics .8
5.1 Type B residual current device .8
5.2 Standard values of break time and non-actuating time for residual direct
currents which result from rectifying circuits and for residual smooth direct
current .9
5.3 Standard values of tripping current according to frequencies which differ
from the rated frequency 50/60 Hz .9
6 Marking and other product information.10
7 Standard conditions for operation in service and for installation.10
8 Conditions for construction and operation.10
8.1 Operation in response to the type of residual current.10
8.1.1 Residual sinusoidal alternating currents up to 1 000 Hz.10
8.1.2 Residual alternating current superimposed on a residual smooth
direct current .10
8.1.3 Residual pulsating direct current superimposed on a smooth direct
current.10
8.1.4 Residual pulsating direct currents which may result from rectifying
circuits supplied from two phases .11
8.1.5 Residual pulsating direct currents which may result from rectifying
circuits supplied from three phases .11
8.1.6 Residual smooth direct current .11
9 Tests .11
9.1 Verification of the operating characteristic at the reference temperature
(20 ± 5) °C .11
9.1.1 Verification of the correct operation in case of residual sinusoidal
alternating currents up to 1 000 Hz.12
9.1.2 Verification of the correct operation in the case of a residual
alternating current superimposed on a residual smooth direct current.12
9.1.3 Verification of the correct operation in the case of a residual
pulsating direct current superimposed on a residual smooth direct
current.12
9.1.4 Verification of the correct operation in case of residual direct currents
which may result from rectifying circuits supplied from two phases .13
9.1.5 Verification of the correct operation in case of residual direct currents
which may result from rectifying circuits supplied from three phases .13
9.1.6 Verification of the correct operation in case of residual smooth direct
current.13
9.2 Tests at the temperature limits .14
9.3 Verification of the RCD after test sequences .14

62423 © IEC:2007 – 3 –
Annex A (normative) Number of samples to be submitted and test sequences to be

applied for verification of conformity for type B RCCBs .21

Annex B (normative) Number of samples to be submitted and test sequences to be

applied for verification of conformity for type B RCBOs .23

Annex C (normative) Routine tests.25

Bibliography.26

Table 1 – Standard values of break time and non-actuating time for residual direct
currents which result from rectifying circuits and for residual smooth direct current.9
Table 2 – Residual non-operating and operating current according to frequencies
which differ from the rated frequency 50/60 Hz .9
Table A.1 – Test sequences for type B RCCBs .21
Table B.1 – Test sequences for type B RCBOs .23

Figure 1 – Test circuit for the verification of correct operation in case of residual
sinusoidal alternating current up to 1 000 Hz .15
Figure 2 – Test circuit for the verification of correct operation in case of a residual
alternating current superimposed on a smooth direct current .16
Figure 3 – Test circuit for the verification of correct operation in case of a residual
pulsating direct current superimposed on a smooth direct current .17
Figure 4a – Test circuit for the verification of the correct operation in case of residual
pulsating direct currents which may result from rectifying circuits supplied from two
phases.18
Figure 4b – Test circuit for the verification of the correct operation in case of residual
pulsating direct currents which may result from rectifying circuits supplied from three
phases.19
Figure 4 – Test circuit for the verification of the correct operation in case of residual
pulsating direct currents which may result from rectifying circuits supplied from two or
three phases.19
Figure 5 – Verification of the correct operation in case of a residual smooth direct

current .20

– 4 – 62423 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
TYPE B RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS

WITH AND WITHOUT INTEGRAL OVERCURRENT PROTECTION

FOR HOUSEHOLD AND SIMILAR USES

(TYPE B RCCBs AND TYPE B RCBOs)

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 62423 has been prepared by subcommittee 23E: Circuit-breakers
and similar equipment for household use, of IEC technical committee 23: Electrical
accessories.
This International Standard is to be read in conjunction with the following standards:
IEC 61008-1:1996, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules
Amendment 1(2002)
Amendment 2 (2006)
62423 © IEC:2007 – 5 –
IEC 61009-1:1996, Residual current operated circuit-breakers with integral overcurrent
protection for household and similar uses (RCBOs) – Part 1: General rules

Amendment 1(2002)
Amendment 2 (2006)
The text of this standard is based on the following documents:

FDIS Report on voting
23E/629/FDIS 23E/636/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication 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.
– 6 – 62423 © IEC:2007
INTRODUCTION
RCCBs and RCBOs designed according to IEC 61008-1 and IEC 61009-1 are suitable in most

of the applications, however the use of new electronic technology in equipment may result in

particular residual currents not covered in IEC 61008-1 or IEC 61009-1.

This standard includes definitions, additional requirements and tests for Type B RCCBs and

Type B RCBOs to cover particular situations.

The tests shall first be applied according to IEC 61008-1 for Type B RCCBs and according to

IEC 61009-1 for Type B RCBOs.
After completion of the tests given either in IEC 61008-1 or IEC 61009-1 the additional tests
given in this standard shall be applied in order to show conformity to this standard (see
Annex A or Annex B respectively).
The number of samples to be submitted and test sequences to be applied for verification of
conformity for RCCB Type B or RCBO Type B are given in Annex A or Annex B respectively.
Smooth d.c. currents are unlikely to occur in a single phase supply with neutral. If
nevertheless a smooth d.c. residual current can occur, a three-pole or four-pole device may
be used if the manufacturer declares the device appropriate for single phase application.

62423 © IEC:2007 – 7 –
TYPE B RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS

WITH AND WITHOUT INTEGRAL OVERCURRENT PROTECTION

FOR HOUSEHOLD AND SIMILAR USES

(TYPE B RCCBs AND TYPE B RCBOs)

1 Scope
The scope of IEC 61008-1 and IEC 61009-1 applies.
This standard specifies requirements and tests for type B RCDs. Requirements and tests
given in this standard are in addition to the requirements of type A residual current devices.
Type B RCCBs and Type B RCBOs are able to provide protection in case of alternating
residual sinusoidal currents up to 1 000 Hz, pulsating direct residual currents and smooth
direct residual currents in case of three phase supply.
Type B RCCBs and Type B RCBOs according to this standard are not intended to be used in
d.c. supply systems.
Further requirements and tests for products to be used in situations where the residual
current was not intended to be covered in IEC 61008-1 or IEC 61009-1 are under
consideration.
For the purpose of manufacturer’s declaration or verification of conformity type tests should
be carried out in test sequences in compliance with Annex A or Annex B of this standard.
The complete test sequence for type test of Type B RCCBs and Type B RCBOs is given in
Tables A.1 or B.1.
NOTE 1 Throughout the document, the term RCD refers to RCCBs and RCBOs.
NOTE 2 Requirements for 1 pole and 2 poles are under consideration.
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 60479-1, Effects of current on human beings and livestock – Part 1: General aspects
IEC 60479-2, Effects of current passing through the human body – Part 2: Special aspects
IEC 61008-1:1996, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules
Amendment 1 (2002)
Amendment 2 (2006)
– 8 – 62423 © IEC:2007
IEC 61009-1:1996, Residual current operated circuit-breakers with integral overcurrent
protection for household and similar uses (RCBOs) – Part 1: General rules

Amendment 1 (2002)
Amendment 2 (2006)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1
smooth direct current
a direct current which is ripple free
3.2
type B residual current device
residual current device for which tripping is ensured as for type A according to IEC 61008-1 or
IEC 61009-1, as applicable, and in addition
− for residual sinusoidal alternating currents up to 1 000 Hz,
− for residual pulsating direct currents,
− for residual alternating currents superimposed on a smooth direct current,
− for residual pulsating direct currents superimposed on a smooth direct current,
− for residual pulsating rectified d.c. which results from two or more phases,
− for residual smooth direct currents,
independent of polarity and independent whether the residual current appears suddenly or is
slowly increased
4 Classification
According to IEC 61008-1 or IEC 61009-1, as applicable.
5 Characteristics
5.1 Type B residual current device
Type B RCD for which tripping is ensured as for type A according to IEC 61008-1 or
IEC 61009-1 as applicable and in addition

− for residual sinusoidal alternating currents up to 1 000 Hz (see 8.1.1),
) or
− for residual smooth direct current of 0,4 times the rated residual operating current (I
Δn
10 mA whichever is the highest value superimposed on an alternating current (see 8.1.2),
− for residual smooth direct current of 0,4 times the rated residual operating current (I ) or
Δn
10 mA, whichever is the highest value superimposed on a pulsating direct current (see
8.1.3),
− for residual pulsating rectified d.c. currents which results from two or more phases (see
8.1.4 and 8.1.5),
− for residual smooth direct currents originating from multiphase circuits (see 8.1.6).
The above specified residual currents may be suddenly applied or slowly increased.

62423 © IEC:2007 – 9 –
5.2 Standard values of break time and non-actuating time for residual direct currents

which result from rectifying circuits and for residual smooth direct current

Table 1 – Standard values of break time and non-actuating time for residual direct

currents which result from rectifying circuits and for residual smooth direct current

Standard values of break time and non-actuating time

at a residual operating current (I ) equal to
Δ
s
I I 2 I 4 I 10I 5 A,10 A,
Δn Δn Δn
n Δn
Type
A A
20 A, 50 A,
100 A,
200 A
a
Maximum break
General Any value Any value 0,3 0,15 0,04 0,04
times
Maximum break
0,5 0,2 0,15 0,15
times
S ≥ 25 > 0,030
Minimum non-
0,13 0,06 0,05 0,04
actuating times
For Type B RCBOs, any value exceeding the lower limit of the overcurrent instantaneous tripping
range are not tested.
a
The tests are only made during the verification of the correct operation as mentioned in 9.1.4b)
according to Figure 4a and in 9.1.5b) according to Figure 4b.

5.3 Standard values of tripping current according to frequencies which differ from
the rated frequency 50/60 Hz
Table 2 – Residual non-operating and operating current according to frequencies
which differ from the rated frequency 50/60 Hz
Frequency Residual non-operating current Residual operating current
Hz
I I
Δn Δn
a
150 0,5 2,4
a
400 0,5 6
a b
1 000 14
a
The values correspond to the threshold of ventricular fibrillation according to IEC 60479-1 in combination
with the frequency factor for ventricular fibrillation according to IEC 60479-2.

b
The IEC 60479 series gives no factors for frequencies above 1 kHz.
NOTE 1 The definitions of “residual non-operating current and of “operating currents” are those of
IEC 61008-1 and IEC 61009-1.
NOTE 2 The waveform for the given frequencies is sinusoidal.
NOTE 3 The maximum permissible earthing impedance at a frequency f depends on the upper limit of the
x
operating currents of the RCD at that frequency.
NOTE 4 The relationship between the frequency of the acceptable touch voltages and the dissipated
power in the human body are under consideration. Until final values are fixed the maximum allowed touch
voltage of 50 V for 50/60 Hz is recommended.

– 10 – 62423 © IEC:2007
6 Marking and other product information

Add the following symbol adjacent to the symbol for type A, e.g.

Alternatively the following symbol may be used:

NOTE The manufacturer should provide information regarding the maximum earthing resistance of the electrical

installation taking into account the tripping level at higher frequencies.

7 Standard conditions for operation in service and for installation
According to IEC 61008-1 or IEC 61009-1, as applicable.
8 Conditions for construction and operation
8.1 Operation in response to the type of residual current
8.1.1 Residual sinusoidal alternating currents up to 1 000 Hz
Type B RCDs shall comply with the values given in Table 2 of this standard.
Compliance is checked by the tests of 9.1.1a).
Type B RCDs shall operate in response to a sudden appearance of the residual operating
current given in Table 2. The maximum break time of RCDs of the general type shall be 0,3 s
and for RCDs of the S-type the minimum non-actuating time shall be equal to or not lower
than 0,13 s, and the maximum break time shall not exceed 0,5 s.
Compliance is checked by the tests of 9.1.1b).
8.1.2 Residual alternating current superimposed on a residual smooth direct current
Type B RCDs shall operate in case of residual alternating currents of the rated frequency
superimposed on a residual smooth direct current of 0,4 times the rated residual current (I )
Δn
or 10 mA, whichever is the highest value.
The alternating tripping current shall be equal to or lower than I .
Δn
Compliance is checked by the tests of 9.1.2.
8.1.3 Residual pulsating direct current superimposed on a smooth direct current
Type B RCDs shall operate in case of residual pulsating direct currents superimposed on a
residual smooth direct current of 0,4 times the rated residual current (I ) or 10 mA,
Δn
whichever is the highest value.
The tripping current shall not be higher than 1,4 I for RCDs with I >0,01 A, or 2 I for
Δn Δn Δn
RCDs with I ≤ 0,01A.
Δn
NOTE The tripping current 1,4 I or 2 I , as applicable, is the r.m.s. value due to the half-wave pulsating direct
Δn
Δn
current.
Compliance is checked by the tests of 9.1.3.

62423 © IEC:2007 – 11 –
8.1.4 Residual pulsating direct currents which may result from rectifying circuits

supplied from two phases
Type B RCDs shall operate in response to a steady increase of residual pulsating direct

current resulting from rectifying circuits within the limits of 0,5 I to 2 I .
Δn Δn
Compliance is checked by the tests of 9.1.4a).

Type B RCDs shall operate in response to a sudden appearance of residual pulsating direct

current resulting from rectifying circuits according to the limits specified in Table 1.

Compliance is checked by the tests of 9.1.4b).
8.1.5 Residual pulsating direct currents which may result from rectifying circuits
supplied from three phases
Type B RCDs shall operate in response to a steady increase of residual pulsating direct
current resulting from rectifying circuits within the limits of 0,5 I to 2 I .
Δn Δn
Compliance is checked by the tests of 9.1.5a).
Type B RCDs shall operate in response to a sudden appearance of residual pulsating direct
current resulting from rectifying circuits according to the limits specified in Table 1.
Compliance is checked by the tests of 9.1.5b).
8.1.6 Residual smooth direct current
Type B RCDs shall operate in response to a steady increase of smooth direct residual current
within the limits of 0,5 I to 2 I .
Δn Δn
Compliance is checked by the tests of 9.1.6.1a) and 9.1.6.2.
Type B RCDs shall operate in response to a sudden appearance of smooth direct residual
current according to the limits specified in Table 1 of this standard.
Compliance is checked by the tests of 9.1.6.1b).
9 Tests
9.1 Verification of the operating characteristic at the reference temperature
(20 ± 5) °C
The RCD is installed as for normal use.
All tests shall be carried out with the RCD supplied first at 0,85 U and then at 1,1 U with
n n
rated frequency and, unless otherwise specified, without load.
In case of RCDs having multiple settings of residual operating current, the tests are made for
each setting.
– 12 – 62423 © IEC:2007
9.1.1 Verification of the correct operation in case of residual sinusoidal alternating
currents up to 1 000 Hz
a) The test shall be performed according to Figure 1. The test switches S and S and the
1 2
RCD being in the closed position, the residual current is steadily increased, starting from

a value not higher than 0,2 I , trying to attain the value of residual operating current
Δn
given in Table 2 within 30 s, the tripping current being measured.

The test is carried out on one pole taken at random at each frequency given in Table 2

and repeated five times, the tripping values shall be in compliance with Table 2.

b) A second series of tests is carried out to verify the break time.

The test circuit being calibrated at the residual operating current corresponding to
1 000 Hz according to Table 2, the test switch S and the RCD being in the closed
position, the residual current is suddenly established by closing the test switch S .
Five measurements of the break time are made on one pole taken at random.
The maximum break time shall not exceed 0,3 s for general type RCDs and for S-type
RCDs the minimum non-actuating time shall be equal to or greater than 0,13 s and the
maximum break time shall not exceed 0,5 s.
9.1.2 Verification of the correct operation in the case of a residual alternating current
superimposed on a residual smooth direct current
The test shall be performed according to Figure 2.
The test switches S and S and the RCD being in the closed position, the residual smooth
1 2
direct current is applied through one pole chosen at random and is adjusted to 0,4 I or
Δn
10 mA, whichever is the highest value.
The residual alternating current of the rated frequency is applied to another pole and is
steadily increased, starting from a value not higher than 0,2 I , trying to attain the value of
Δn
I within 30 s, the tripping current being measured.
Δn
The test is made twice at each position I and II of S .
The alternating tripping current shall be equal or lower than I .
Δn
9.1.3 Verification of the correct operation in the case of a residual pulsating direct
current superimposed on a residual smooth direct current
The test shall be performed according to Figure 3.

The test switches S and S and the RCD being in the closed position, the residual smooth
1 2
direct current is applied through one pole chosen at random and is adjusted to 0,4 I or
Δn
10 mA, whichever is the highest value.
The residual pulsating direct current is applied to another pole chosen at random with a
current delay angle α of 0° and is steadily increased, starting from a value not higher than
0,2 I , trying to attain the value of 1,4 I for RCDs with I > 0,01 A, or 2 I for RCDs with
Δn Δn Δn Δn
I ≤ 0,01 A within 30 s, the tripping current being measured.
Δn
The RCD is tested, twice at each position I and II of S and S .
3 4
62423 © IEC:2007 – 13 –
The RCD shall trip before the residual pulsating direct current reaches a value not exceeding
1,4 I for RCDs with I > 0,01 A, or 2 I for RCDs with I ≤ 0,01 A.

Δn Δn Δn Δn
9.1.4 Verification of the correct operation in case of residual direct currents which
may result from rectifying circuits supplied from two phases

a) The test shall be performed according to Figure 4a.

The test switches S and S and the RCD being in the closed position, the residual
1 2
pulsating direct current is steadily increased, starting from a value not higher than 0,2 I ,

Δn
trying to attain the value of 2 I within 30 s, the tripping current being measured.
Δn
The test circuit is connected to the RCD at two line terminals chosen at random.
The RCD is tested five times at each position I and II of S .
The RCD shall trip within the limits of 0,5 I to 2 I .
Δn Δn
b) A second series of tests is made to verify the break time.
The test circuit being successively calibrated at each current value given in Table 1, the
test switch S and the RCD being in the closed position, the residual current is suddenly
established by closing the test switch S .
With the RCD connected at two line terminals chosen at random, five measurements of
the break time are made at each value of residual current given in Table 1 at each
position I and II of S .
The break times shall be in compliance with the values given in Table 1.
9.1.5 Verification of the correct operation in case of residual direct currents which
may result from rectifying circuits supplied from three phases
a) The test shall be performed according to Figure 4b.
The test switches S and S and the RCD being in the closed position, the residual
1 2
pulsating direct current is steadily increased, starting from a value not higher than 0,2 I ,
Δn
trying to attain the value of 2 I within 30 s, the tripping current being measured.
Δn
The RCD is tested five times at each position I and II of S .
The RCD shall trip within the limits of 0,5 I to 2 I .
Δn Δn
b) A second series of tests is made to verify the break time.
The test circuit being successively calibrated at each current value given in Table 1, the
test switch S and the RCD being in the closed position, the residual current is suddenly
established by closing the test switch S .
Five measurements of the break time are made at each value of residual current given in
Table 1 at each position I and II of S .
The break times shall be in compliance with the values given in Table 1 of this standard.
9.1.6 Verification of the correct operation in case of residual smooth direct current
9.1.6.1 Verification of the correct operation in case of residual smooth direct current
without load
a) The test shall be performed according to Figure 5.

– 14 – 62423 © IEC:2007
The test switches S and S and the RCD being in the closed position, the residual
1 2
smooth direct current is steadily increased, starting from a value not higher than 0,2 I ,
Δn
trying to attain the value of 2 I within 30 s, the tripping current being measured.

Δn
One pole of the RCD, chosen at random and exemplified in Figure 5, is tested twice at

each position I and II of S .
The RCD shall trip within the limits of 0,5 I to 2 I .
Δn Δn
b) A second series of tests is made to verify the break time.

The test circuit being successively calibrated at each residual operating current value
given in Table 1 (except 5 A, 10 A, 20 A, 50 A, 100 A and 200 A), the test switch S and

the RCD being in the closed position, the residual current is suddenly established by

closing the test switch S . The test switch S is in position I or II chosen at random.
2 3
Two measurements of the break time are made at one pole chosen at random at each
residual operating current.
The break times shall be in compliance with the values given in Table 1 of this standard.
9.1.6.2 Verification of the correct operation in case of residual smooth direct current
with load
The test of 9.1.6.1 a) is repeated, the RCD being loaded with the rated current as in normal
service for a sufficient time so as to reach thermal steady-state conditions.
NOTE The loading with rated current is not shown in Figure 5.
9.2 Tests at the temperature limits
The RCD shall perform the tests specified in 9.1.4 b), 9.1.5 b) and 9.1.6.1b) under the
following conditions, successively:
a) ambient temperature: –5 °C, off-load;
b) ambient temperature: +40 °C, the RCD having been previously loaded with the rated
current, at any convenient voltage, until it attains thermal steady-state conditions.
In practice, these conditions are reached when the variation of temperature-rise does not
exceed 1 K per hour.
In the case of RCDs having multiple settings of residual operating current, the tests are made
for each setting.
NOTE Preheating may be made at reduced voltage but auxiliary circuits should be connected to their normal
operating voltage (particularly for components depending on the line voltage).

9.3 Verification of the RCD after test sequences
The RCD shall trip with a test current of 2,5 I with smooth direct current.
Δn
One test only is made without measurement of break time.

62423 © IEC:2007 – 15 –
S
N
S
A
S
D
R
G
IEC  736/07
Components
S supply
A ammeter (measuring r.m.s. values)
S all-pole switch
S single-pole switch
D RCD under test
R variable resistor
G generator
Figure 1 – Test circuit for the verification of correct operation
in case of residual sinusoidal alternating current up to 1 000 Hz

– 16 – 62423 © IEC:2007
S
N
S
V
S
D
I A I A
1 0
S
R R
2 1
I II
IEC  737/07
Components
S supply
V voltmeter
A  ammeter (measuring r.m.s. values)
D RCD under test
R , R variable resistor
1 2
S multipole switch
S single-pole switch
S      two-way switch
Figure 2 – Test circuit for the verification of correct operation in case of
a residual alternating current superimposed on a smooth direct current

62423 © IEC:2007 – 17 –
S
N
S
V
S
D
I I
1 A 0 A
S S
3 4
R R
2 1
I II I II
D
i
IEC  738/07
Components
S supply
V voltmeter
A  ammeter (measuring r.m.s. values)
D RCD under test
D  diodes
i
R , R  variable resistor
1 2
S  multipole switch
S  single-pole switch
S and S two-way switch
3 4
Figure 3 – Test circuit for the verification of correct operation in case of a residual
pulsating direct current superimposed on
a smooth direct current
– 18 – 62423 © IEC:2007
S
N
A
S
V
A
S
D
R
D
i
I II
S
IEC  739/07
Components
Point A supply by 2 phases chosen at random
S supply
V voltmeter
A ammeter (measuring r.m.s. values)
D RCD under test
D diodes
i
R variable resistor
S multipole switch
S single-pole switch
S two-way switch
Figure 4a – Test circuit for the verification of the correct operation in case of
residual pulsating direct currents which may result from rectifying circuits
supplied from two phases
62423 © IEC:2007 – 19 –
S
N
S
V
S
D
A
R
D
i
I II
S
IEC  740/07
Components
S supply
V voltmeter
A ammeter (measuring r.m.s. values)
D RCD under test
D diodes
i
R variable resistor
S multipole switch
S single-pole switch
S two-way switch
Figure 4b – Test circuit for the verification of the correct operation in case of
residual pulsating direct currents which may result from rectifying circuits
supplied from three phases
Figure 4 – Test circuit for the verification of the correct operation in case of
residual pulsating direct currents which may result from rectifying circuits
supplied from two or three phases

– 20 – 62423 © IEC:2007
S
N
S
V
S
D
I
A
S
R
I II
IEC  741/07
Components
S supply
V voltmeter
A ammeter (measuring r.m.s. values)
D RCD under test
R variable resistor
S multipole switch
S single-pole switch
S two-way switch
Figure 5 – Verification of the correct operation in case of
a residual smooth direct current

62423 © IEC:2007 – 21 –
Annex A
(normative)
Number of samples to be submitted and test sequences

to be applied for verification of conformity for type B RCCBs

NOTE The verification may be made

- by the manufacturer for the purpose of supplier's declaration of conformity, or

- by an independent body for the purpose of certification. According to the terminology of ISO/IEC Guide 2, the
term "certification" can be used for the second case only.
A.1 Test sequences for type B RCCBs
The tests are made according to Table A.1 of this annex, where the tests in each sequence
are carried out in the order indicated.
Table A.1 – Test sequences for type B RCCBs
Test Tests according to Additional tests Test (or inspection)
sequence IEC 61008-1 according to
this standard
6 6 Marking
8.1.1 No General
8.1.2 No Mechanism
9.3 No Indelibility of marking
8.1.3 No Clearance and creepage distances (external parts only)
9.15 No Trip-free mechanism
9.4 No Reliability of screws, current-carrying parts and connections
A
9.5 No Reliability of terminals for external conductors
9.6 No Protection against electric shock
Verification of the RCD after
9.13.1 9.3
test sequence
Resistance to heat
9.13.2
No
9.13.3
8.1.3 No Clearances and creepage distances (internal parts)
9.14 No Resistance to abnormal heat and to fire

9.7 No Test of dielectric properties
9.8 No Temperature rise
9.20 No Resistance of insulation against impulse voltages
B
9.22.2 No Reliability at 40 °C
9.23 No Ageing of electronic components
-- 9.3 Verification of the RCD after test sequence
9.10 No Mechanical and electrical endurance
C
-- 9.3 Verification of the RCD after test sequence

– 22 – 62423 © IEC:2007
Table A.1 (continued)
Test Tests according to Additional tests Test (or Inspection)

sequence IEC 61008-1 according to
this standard
9.9 No Residual operating characteristics

Verification of the correct operation in case of residual
D
9.1.6.1 smooth direct current without load for ratings of I not tested

∆n
in D
9.17 No Behaviour in the case of failure of the line voltage

No Unwanted tripping
9.19
Behaviour in the case of surge currents

a
9.21.1 No Type A residual current devices
D
9.1 Type B residual current devices

9.2 Tests at temperature limits
D
9.11.2.3 No Performance at I
∆m
9.16 No Test device
9.12 No Resistance to mechanical shock and impact
9.18 No Non-operating current under overcurrent conditions
-- 9.3 Verification of the RCD after test sequence
9.11.2.4 a) No Coordination at I
nc
E 9.11.2.2 No Performance at I
m
-- 9.3 Verification of the RCD after test
...