IEC 62640:2011

IEC 62640 ®
Edition 1.0 2011-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Residual current devices with or without overcurrent protection for
socket-outlets for household and similar uses

Dispositifs à courant différentiel résiduel avec ou sans protection contre les
surintensités pour les socles de prises de courant destinés à des installations
domestiques et analogues
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IEC 62640 ®
Edition 1.0 2011-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Residual current devices with or without overcurrent protection for
socket-outlets for household and similar uses

Dispositifs à courant différentiel résiduel avec ou sans protection contre les
surintensités pour les socles de prises de courant destinés à des installations
domestiques et analogues
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XF
ICS 29.120.50 ISBN 978-2-88912-325-4

– 2 – 62640  IEC:2011
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 14
3.1 Definitions relating to currents flowing from live parts to earth . 14
3.2 Definitions relating to the energization of a residual current device . 15
3.3 Definitions relating to the operation and functions of the residual current
device . 15
3.4 Definitions relating to values and ranges of energizing quantities . 17
3.5 Definitions relating to values and ranges of influencing quantities . 19
3.6 Definitions relating to conditions of operation . 20
3.7 Definitions relating to tests . 21
3.8 Definitions relating to residual current devices in general . 21
4 Classification . 21
4.1 Classification according to behaviour resulting from failure of the line voltage . 22
4.1.1 SRCD not opening automatically in case of failure of the line voltage . 22
4.1.2 SRCD opening automatically in case of failure of the line voltage . 22
4.2 Classification according to the design . 22
4.2.1 SRCD consisting of an RCD incorporated in (a) fixed socket-outlet(s) . 22
4.2.2 SRCD consisting of an RCD intended to be associated with fixed
socket-outlets within the same mounting box or within two adjacent
compatible boxes. 22
4.2.3 SRCD consisting of an RCD incorporated in a connection unit
intended to protect only one piece of fixed electrical equipment (e.g.
hand dryer, water cooler, etc.) immediately adjacent to the SRCD . 22
4.3 Classification according to behaviour in presence of d.c. components . 22
4.4 Classification according to the provision for earthing . 22
4.5 Classification according to the design of the cover plate . 22
4.6 Classification according to the method of mounting . 22
4.7 Classification according to the environmental conditions . 23
4.7.1 Classification according to the degree of protection against ingress of
solid foreign objects . 23
4.7.2 Classification according to the degree of protection against harmful
ingress of water . 23
4.7.3 Classification according to the range of ambient air temperature . 23
4.8 Classification according to the type of terminals . 23
4.9 Classification according to overcurrent protection . 23
5 Characteristics of SRCDs . 23
5.1 Summary of characteristics . 23
5.2 Characteristics common to all socket-outlet residual current devices . 24
5.2.1 Rated current (I ) . 24
n
5.2.2 Rated residual operating current (I ) . 24
∆n
5.2.3 Rated residual non-operating current (I ) . 24
∆no
5.2.4 Rated voltage (U ) . 24
n
5.2.5 Rated frequency . 24
5.2.6 Rated residual making and breaking capacity (I ) . 24
∆m
62640  IEC:2011 – 3 –
5.2.7 Operating characteristics in case of residual current . 24
5.3 Characteristics specific to SRCDs with overcurrent protection (see 4.9) . 25
5.3.1 SRCDs classified according to 4.9 a), 4.9 b) and 4.9 c) 1) . 25
5.3.2 Rated short-circuit capacity (I ) for SRCD classified according to 4.9
cn
c) 2) . 26
5.4 Preferred or standard values . 26
5.4.1 Preferred values of rated voltage (U ) . 26
n
5.4.2 Standard values of rated current (I ) . 26
n
5.4.3 Standard values of rated residual operating current (I ) . 26
∆n
5.4.4 Standard value of rated residual non-operating current (I ) . 26
∆no
5.4.5 Standard values of rated frequency . 26
5.4.6 Standard values of the rated making and breaking capacity (I ) . 26
m
5.4.7 Standard values of the rated residual making and breaking capacity
(I ) . 27
∆m
5.4.8 Standard values of the rated conditional short-circuit current (I ) . 27
nc
5.4.9 Standard values of the rated conditional residual short-circuit current
(I ) . 27
∆c
5.4.10 Standard values of the rated short-circuit capacity (I ) . 27
cn
5.4.11 Standard values of break time . 27
5.5 Standard ranges of overcurrent instantaneous tripping for SRCDs to 4.9 c) 2). 28
6 Marking and other product information. 28
6.1 General . 28
6.2 Additional marking for screwless terminals . 30
6.3 Additional marking for SRCDs with an FE connection . 30
7 Standard conditions for operation in service and for installation . 30
8 Requirements for construction and operation . 31
8.1 General . 31
8.2 Information and marking . 31
8.3 Mechanical and electrical design . 31
8.3.1 Mechanism . 31
8.3.2 Clearance and creepage distances . 32
8.3.3 Standing current in the FE . 34
8.3.4 Screws, current-carrying parts and connections . 34
8.3.5 Terminals . 35
8.4 Operating characteristics . 35
8.4.1 Operation in response to the type of residual current . 35
8.4.2 Operation in response to the presence of a residual current equal to
or greater than I . 36
∆n
8.5 Behaviour of SRCDs with feed through terminals in case of miswiring . 36
8.6 Test device. 36
8.7 Temperature rise . 36
8.8 Resistance to humidity . 37
8.9 Dielectric properties . 37
8.10 EMC compliance and unwanted tripping . 37
8.10.1 EMC . 37
8.10.2 Resistance against unwanted tripping due to current surges caused
by impulse voltages for SRCDs of I ≥ 0,010 A . 37

∆n
8.11 Behaviour of SRCDs in case of overcurrent conditions . 37
8.11.1 For all SRCDs . 37

– 4 – 62640  IEC:2011
8.11.2 Behaviour of SRCDs classified according to 4.9 c) in case of
overcurrent conditions . 38
8.11.3 Standard time-(over)current zone for SRCD according to 4.9 c) 1)
and 4.9 c) 2) . 38
8.12 Resistance of the insulation against impulse voltages . 39
8.13 Mechanical and electrical endurance . 39
8.14 Resistance to mechanical shock . 39
8.15 Reliability . 39
8.16 Protection against electric shock and degree of protection IP of the SRCD . 39
8.16.1 Inaccessibility of live parts . 40
8.16.2 Accessible knobs, operating means etc. . 40
8.16.3 Accessible parts of SRCDs . 40
8.16.4 Degree of protection IP of the SRCD . 41
8.17 Resistance to heat . 41
8.18 Resistance to abnormal heat and to fire . 41
8.19 Behaviour of SRCDs within ambient temperature range . 41
8.20 Resistance to temporary overvoltages . 41
9 Tests . 42
9.1 General . 42
9.1.1 Test conditions . 42
9.1.2 Characteristics of SRCDs . 42
9.2 Marking and test of indelibility of marking . 43
9.3 Verification of the trip-free mechanism . 43
9.3.1 General test conditions . 43
9.3.2 Test procedure . 44
9.4 Test for the verification of electronic circuits . 44
9.5 Requirements for capacitors and specific resistors and inductors . 45
9.5.1 Capacitors . 45
9.5.2 Resistors and inductors . 45
9.6 Test of reliability of screws, current-carrying parts and connections . 47
9.7 Screwed and screwless terminals . 47
9.7.1 Screwed terminals for external copper conductors . 47
9.7.2 Screwless terminals for external copper conductors . 53
9.8 Verification of the operating characteristics of type AC and type A SRCDs . 59
9.8.1 Test circuit . 59
9.8.2 Verification of behaviour in the case of supply voltage failure . 60
9.8.3 Off-load tests with residual sinusoidal alternating currents at the
reference temperature of (20 ± 5) °C . 60
9.8.4 Verification of the correct operation with load at the reference
temperature . 61
9.8.5 Verification of the correct operation at the temperature limits with and
without load . 61
9.8.6 Additional tests for SRCDs fitted with an FE . 62
9.8.7 Verification of correct operation of type A SRCDs with residual
currents having a d.c. component . 63
9.9 Verification of behaviour of SRCDs classified according to 4.2.1 b) in the
case of miswiring . 64
9.10 Verification of the test device . 64
9.10.1 Verification of the simulated residual current . 64
9.10.2 Verification of the operation of the test device . 64

62640  IEC:2011 – 5 –
9.11 Verification of the limit of temperature rise . 65
9.11.1 Test conditions . 65
9.11.2 Ambient air temperature . 65
9.11.3 Test procedure . 66
9.11.4 Measurement of the temperature rise of different parts . 66
9.12 Resistance to humidity . 66
9.12.1 Preparation of the SRCD for test . 66
9.12.2 Test conditions . 66
9.12.3 Test procedure . 66
9.12.4 Condition of the SRCD after the test . 67
9.13 Test of dielectric properties . 67
9.13.1 Insulation resistance of the main circuit . 67
9.13.2 Dielectric strength of the main circuit . 67
9.13.3 Capability of withstanding high d.c. voltages due to insulation
measurements . 68
9.14 EMC compliance and unwanted tripping . 68
9.14.1 Electromagnetic compatibility (EMC) . 68
9.14.2 Verification of resistance against unwanted tripping due to surge
currents to earth resulting from impulse voltages for SRCDs of I ≥
∆n
0,010 A (ring wave test) . 69
9.15 Verification of the behaviour of the SRCD under overcurrent conditions . 69
9.15.1 List of the overcurrent tests . 69
9.15.2 Short-circuit tests . 70
9.15.3 Verification of the making and breaking capacity of the socket-outlet
of the SRCD, classified according to 4.2.1 . 76
9.16 Verification of clearances of the SRCD with the impulse withstand voltage
test . 77
9.17 Mechanical and electrical endurance . 78
9.17.1 Normal operation of socket-outlets of the SRCD . 78
9.17.2 Test of the RCD part of the SRCD . 78
9.18 Resistance to mechanical shock . 80
9.18.1 General . 80
9.18.2 Impact test apparatus . 80
9.18.3 Surface type SRCD . 83
9.18.4 Screwed glands . 84
9.18.5 Shuttered SRCDs . 84
9.19 Reliability . 84
9.19.1 Climatic test . 85
9.19.2 Test with temperature of 40 °C . 86
9.20 Protection against electric shock and degree of protection IP of the SRCD . 87
9.20.1 Protection against electric shock . 87
9.20.2 Degree of protection IP of the SRCD . 88
9.21 Resistance to heat . 88
9.21.1 General . 88
9.21.2 Conditioning . 88
9.21.3 External parts of SRCDs . 88
9.21.4 External Insulating parts . 89
9.22 Resistance to abnormal heat and to fire – Glow-wire test . 89
9.23 SRCDs with overcurrent protection . 90

– 6 – 62640  IEC:2011
9.23.1 Verification of the operating characteristic under overcurrent
conditions . 90
9.23.2 Short-circuit tests for SRCDs according to 4.9 c) 2) . 91
9.23.3 Condition of the SRCD after tests . 92
9.24 Verification of ageing of electronic components . 92
9.25 Verification of the behaviour of the SRCD under temporary overvoltage
conditions . 93
9.26 Verification of the limiting value of FE/PE standing current . 94
9.26.1 Verification of the limiting value of FE/PE standing current when the
neutral is connected . 94
9.26.2 Verification of the limiting value of FE/PE standing current when the
neutral is not connected . 94
Annex A (normative) Test sequence and number of samples to be submitted for
certification purposes . 120
Annex B (normative) Determination of clearances and creepage distances . 125
Annex C informative) Approximate relationship between cross-sectional area in mm
and AWG sizes . 127
Annex D (normative) Routine tests. 128
Annex E (informative) Methods of determination of short-circuit power-factor . 129
Bibliography . 131

Figure 1 – Standard test finger. 95
Figure 2 – General test circuit . 96
Figure 3 – Minimum creepage distances and clearances as a function of peak value of
voltage . 97
Figure 4 – Minimum creepage distances and clearances as a function of peak value of
operating voltage . 98
Figure 5 – Pillar terminals . 99
Figure 6 – Screw terminals and stud terminals . 100
Figure 7 – Saddle terminals . 101
Figure 8 – Mantle terminals . 101
Figure 9 – Arrangement for checking damage to conductors . 102
Figure 10 – Information for deflection test . 103
Figure 11 – Example of a test circuit with current and voltage derived from separate
sources . 104
Figure 12 – Test cycle for low temperature test . 104
Figure 13 – Measurement of the standing FE/PE current . 105
Figure 14 – Test circuit for the verification of the correct operation of SRCDs, in the
case of residual pulsating direct currents . 106
Figure 15 – Test circuit for the verification of the correct operation of SRCDs, in the
case of residual pulsating direct currents superimposed by a smooth direct current . 107
Figure 16 – Damped oscillator current wave 0,5 µs/100 kHz . 108
Figure 17 – Example of test circuit for the verification of resistance against unwanted
tripping due to surge currents to earth resulting from impulse voltages for SRCDs . 108
Figure 18 – Test circuit for the verification of the rated making and breaking capacity
and of the coordination . 109
Figure 19 – Test apparatus for the verification of the minimum I t and I values to be
p
withstood by the SRCD (9.15.2.1 a)) . 110

62640  IEC:2011 – 7 –
Figure 20 – Gauge for checking non-accessibility of live parts . 111
Figure 21 – Impact-test apparatus . 112
Figure 22 – Details of the striking element . 113
Figure 23 – Mounting support for specimens . 114
Figure 24 – Mounting block for flush-type SRCDs . 114
Figure 25 – Reliability test cycle . 115
Figure 26 – Ball-pressure test apparatus . 116
Figure 27 – Sketches and table showing the application of the blows . 117
Figure 28 – Diagrammatic representation of 9.22 . 118
Figure 29 – Test circuit for the verification of TOV withstand (9.25) . 119
Figures B.1 to B.10 – Illustrations of the application of creepage distances . 126

Table 1 – Standard values of maximum break time of SRCDs for a.c. residual current . 27
Table 2 – Standard values of maximum break time of SRCDs for pulsating d.c. residual
current . 28
Table 3 – Ranges of overcurrent instantaneous tripping . 28
Table 4 – Position of marking . 29
Table 5 – Values of influencing quantities . 31
Table 6 – Minimum clearances and creepage distances . 33
Table 7 – Tripping current limits . 35
Table 8 – Temperature-rise values . 37
Table 9 – Time-(over)load operating characteristics . 38
Table 10 – Instantaneous operating characteristics . 38
Table 11 – Withstand values and duration of temporary overvoltages . 41
Table 12 – Test copper conductors corresponding to the rated currents . 42
Table 13 – List of type tests . 43
Table 14 – Maximum permissible temperatures under abnormal conditions . 46
Table 15 – Screw thread diameters and applied torques . 47
Table 16 – Relationship between rated current and connectable nominal cross-
sectional areas of copper conductors . 48
Table 17 – Values for flexing under mechanical load test for copper conductors . 50
Table 18 – Values for pull test for screw-type terminals . 50
Table 19 – Composition of conductors . 51
Table 20 – Tightening torques for the verification of the mechanical strength of screw-
type terminals . 52
Table 21 – Relationship between rated current and connectable cross-sectional areas
of copper conductors for screwless terminals . 54
Table 22 – Value for pull test for screwless-type terminals . 56
Table 23 – Values for flexing under mechanical load test for copper conductors . 56
Table 24 – Test current for the verification of electrical and thermal stresses in normal
use for screwless terminals . 57
Table 25 – Nominal cross-sectional areas of rigid copper conductors for deflection test
of screwless terminals . 59
Table 26 – Deflection test forces . 59
Table 27 – Tripping current ranges for SRCDs in case of pulsating d.c. current . 63

– 8 – 62640  IEC:2011
Table 28 – Tests to be applied for EMC . 69
Table 29 – Tests to verify the behaviour of SRCDs under overcurrent conditions . 70
Table 30 – Power factor ranges of the test circuit . 72
Table 31 – Test voltage for verification of impulse withstand voltage between poles . 77
Table 32 – Test voltage for verification of impulse withstand voltage with the metal
support . 78
Table 33 – Cross-sectional area for test conductors . 79
Table 34 – Height of fall for impact tests . 82
Table 35 – Torque test values for glands . 84
Table A.1 – Test sequences. 121
Table A.2 – Number of samples for full test procedure . 123
Table A.3 – Number of samples for simplified test procedure . 124

62640  IEC:2011 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESIDUAL CURRENT DEVICES WITH OR WITHOUT OVERCURRENT
PROTECTION FOR SOCKET-OUTLETS FOR
HOUSEHOLD AND SIMILAR USES
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,
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
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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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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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 62640 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 standard is based on the following documents:
FDIS Report on voting
23E/706/FDIS 23E/713/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.

– 10 – 62640  IEC:2011
In this standard, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
The committee has decided that the contents of this 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.
62640  IEC:2011 – 11 –
INTRODUCTION
IEC series 61008 and IEC 61009 are applicable to residual current devices having one to four
poles used in any part of an electrical installation. These devices may be installed either at
the origin of a whole installation or upstream of one or several circuits of a fixed installation or
upstream of a circuit powering one or more socket-outlets, or be integrated in the same
enclosure as a socket-outlet.
Such residual current devices are able to provide fault protection (protection against indirect
contact), additional protection (protection against direct contact) if the rated residual current is
equal to or less than 30 mA and protection against fire hazard due to a persistent earth
leakage current without the operation of the overcurrent protection. Equipment meeting the
requirements of the series IEC 61008 or IEC 61009 ensure isolation, withstand high levels of
electromagnetic disturbances for household and similar applications and allow safe use of an
electrical installation.
Although the series IEC 61008 and IEC 61009 may be applicable to “residual current devices
integrated in socket-outlets” it is acknowledged that due to the specific use and location of a
socket-outlet, at the boundary of the fixed installation and immediately upstream of electrical
equipment powered through a plug inserted into the socket-outlet, these devices require
different features.
The residual current device at socket-outlet level is normally intended to be installed by
skilled or instructed persons. It can be operated several times per day. The isolation function
is not necessary since pulling out
...