IEC 63052:2019

IEC 63052 ®
Edition 1.0 2019-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Power frequency overvoltage protection devices (POPs) for household and
similar applications
Dispositifs de protection contre les surtensions à fréquence industrielle (POP)
pour les applications domestiques et similaires

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IEC 63052 ®
Edition 1.0 2019-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Power frequency overvoltage protection devices (POPs) for household and

similar applications
Dispositifs de protection contre les surtensions à fréquence industrielle (POP)

pour les applications domestiques et similaires

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-7268-8

– 2 – IEC 63052:2019 © IEC 2019
CONTENTS
FOREWORD . 8
1 Scope . 10
2 Normative references . 10
3 Terms, definitions and abbreviated terms . 12
3.1 Terms and definitions. 12
3.2 Abbreviated terms . 14
4 Classification . 15
4.1 According to the method of construction . 15
4.2 According to the number of monitored line-to-neutral conductor voltages . 15
4.3 According to the method of mounting . 15
5 Characteristics of POPs . 15
5.1 Summary of characteristics . 15
5.2 Rated quantities and other characteristics. 16
5.2.1 Rated voltage . 16
5.2.2 Rated current (I ) . 16
n
5.2.3 Rated frequency . 16
5.2.4 Rated making and breaking capacity (I ) . 16
m
5.2.5 Rated making and breaking capacity on one pole (I ) . 16
m1
5.3 Standard and preferred values . 16
5.3.1 Preferred values of rated voltage (U ) . 16
n
5.3.2 Preferred values of rated current (I ) . 17
n
5.3.3 Preferred values of rated frequency . 17
5.3.4 Minimum value of the rated making and breaking capacity (I ) . 17
m
5.3.5 Minimum value of the rated making and breaking capacity on one pole
(I ) . 17
m1
5.3.6 Standard and preferred values of the rated conditional short-circuit
current (I ) and standard and preferred values of the rated conditional
nc
short-circuit current for one pole (I ) . 17
nc1
5.3.7 Limit values of the break times and non-actuating times . 18
5.3.8 Standard value of rated impulse withstand voltage (U ) . 18
imp
5.4 Coordination with short-circuit protective devices (SCPDs) . 18
5.4.1 General . 18
5.4.2 Rated conditional short-circuit current (I ) and rated conditional short-
nc
circuit on one pole (I ) . 19
nc1
5.4.3 Operating characteristics of opening means for POPs according to 4.1.4. 19
6 Marking and other product information . 19
6.1 Marking . 19
6.2 Additional marking for POPs according to 4.1.4 . 22
6.2.1 Marking of POPs . 22
6.2.2 Instructions for wiring and operation . 22
7 Standard conditions for operation in service and for installation . 22
7.1 Standard conditions . 22
7.2 Conditions of installation . 23
7.3 Pollution degree . 23
8 Requirements for construction and operation . 23
8.1 General . 23

8.2 Mechanical design . 24
8.2.1 General . 24
8.2.2 Mechanism . 25
8.2.3 Clearances and creepage distances . 26
8.2.4 Screws, current-carrying parts and connections . 29
8.2.5 Terminals for external conductors . 30
8.3 Protection against electric shock . 32
8.4 Dielectric properties and isolating capability. 33
8.5 Temperature-rise . 33
8.5.1 Temperature-rise limits . 33
8.5.2 Ambient air temperature . 34
8.6 Operating characteristics . 34
8.6.1 Operating characteristics of the MPD part . 34
8.6.2 Operating characteristics of the POP . 34
8.7 Mechanical and electrical endurance . 34
8.8 Performance at short-circuit currents . 35
8.9 Resistance to mechanical shock and impact . 35
8.10 Resistance to heat . 35
8.11 Resistance to abnormal heat and to fire . 35
8.12 Safety performance of overstressed POPs . 35
8.13 Behaviour of POPs in case of current surges caused by impulse voltages . 35
8.14 Reliability . 35
8.15 Electromagnetic compatibility (EMC) . 35
9 Testing procedure. 36
9.1 General . 36
9.1.1 General testing procedure for the different type of POPs . 36
9.1.2 Characteristics of POPs are checked by means of type tests . 37
9.1.3 For certification purposes, type tests are carried out in test sequences . 38
9.2 Test conditions . 38
9.3 Test of indelibility of marking . 39
9.4 Test of reliability of screws, current-carrying parts and connections . 39
9.5 Test of reliability of terminals for external conductors . 41
9.6 Verification of protection against electric shock . 42
9.7 Test of dielectric properties . 42
9.7.1 Resistance to humidity. 42
9.7.2 Insulation resistance of the main circuit . 43
9.7.3 Dielectric strength of the main circuit . 44
9.7.4 Insulation resistance and dielectric strength of auxiliary circuits . 44
9.7.5 Capability of control circuits connected to the main circuit withstanding

high DC voltages due to insulation measurements . 45
9.7.6 Verification of impulse withstand voltages and of leakage current across
open contacts . 46
9.8 Test of temperature-rise . 48
9.8.1 Ambient air temperature . 48
9.8.2 Test procedure . 48
9.8.3 Measurement of the temperature of parts . 49
9.8.4 Temperature-rise of a part . 49
9.9 Verification of the operating characteristics . 49
9.9.1 Test circuit . 49

– 4 – IEC 63052:2019 © IEC 2019
9.9.2 Off-load characteristic tests with sinusoidal alternating voltages at the
reference temperature of 20 °C ± 5 °C . 49
9.9.3 Test of the effect of the ambient air temperature on the operating
characteristics . 50
9.10 Verification of mechanical and electrical endurance . 50
9.10.1 General test conditions . 50
9.10.2 Test procedure . 50
9.10.3 Additional test for POP according to 4.1.4 . 51
9.10.4 Condition of the POP after the test . 51
9.11 Verification of the behaviour of the POP under short-circuit conditions . 52
9.11.1 General . 52
9.11.2 Short-circuit tests for POPs according to 4.1.4 . 52
9.12 Verification of resistance to mechanical shock and impact . 59
9.12.1 Mechanical shock . 59
9.12.2 Mechanical impact . 60
9.13 Test of resistance to heat . 62
9.13.1 Test on complete product . 62
9.13.2 Ball pressure test. 63
9.14 Test of resistance to abnormal heat and to fire . 64
9.15 Test of safety performance of overstressed POPs . 65
9.16 Verification of behaviour of POPs in case of current surges caused by
impulse voltages . 65
9.16.1 General . 65
9.16.2 Verification of behaviour at surge currents up to 3 000 A (8/20 µs surge
current test) . 66
9.17 Verification of ageing of electronic components . 66
9.18 Electromagnetic compatibility (EMC) . 67
9.18.1 General . 67
9.18.2 EMC tests covered by other clauses/subclauses of the present

document . 67
9.18.3 EMC tests to be performed . 67
9.18.4 POPs performance criteria . 69
9.18.5 Emission tests . 70
9.19 Tests of creepage distances and clearances for electronic circuits (abnormal
conditions) . 71
9.19.1 General . 71
9.19.2 Abnormal conditions . 71
9.19.3 Test procedure . 71
9.20 Requirements for capacitors and specific resistors and inductors used in
electronic circuits . 73
9.20.1 General . 73
9.20.2 Capacitors . 73
9.20.3 Resistors . 74
9.20.4 Inductors and windings . 74
Annex A (normative) Test sequences and number of samples to be submitted for
certification purposes . 91
A.1 Test sequences . 91
A.2 Number of samples to be submitted for full test procedure . 96
A.3 Number of samples to be submitted for simplified test procedures in case of
simultaneous submission of a range of POPs of the same fundamental
design . 96

Annex B (normative) Determination of clearances and creepage distances . 98
B.1 General . 98
B.2 Orientation and location of a creepage distance . 98
B.3 Creepage distances where more than one material is used . 98
B.4 Creepage distances split by floating conductive part . 98
B.5 Measurement of creepage distances and clearances . 98
Annex C (normative) Arrangement for the detection of the emission of ionized gases
during short-circuit tests . 102
Annex D (informative) Methods of determination of short-circuit power factor . 105
D.1 General . 105
D.2 Method I – Determination from DC components . 105
D.3 Method II – Determination with pilot generator . 105
Annex E (informative) Examples of terminal designs . 106
Annex F (informative) Correspondence between ISO and AWG copper conductors . 109
Annex G (informative) SCPDs for short-circuit tests . 110
G.1 General . 110
G.2 Silver wires . 110
G.3 Declared protective devices . 110
G.4 Other means . 111
Annex H (informative) POP configurations according to classification in 4.1 . 112
Bibliography . 113

Figure 1 – Thread forming tapping screw . 74
Figure 2 – Thread cutting tapping screw . 74
Figure 3 – Standard test finger (see 9.6) . 75
Figure 4 – Typical diagram for all short circuit tests except for the verification of the
suitability in IT systems . 76
Figure 5 – Typical diagram for the verification of the suitability in IT systems . 77
Figure 6 – Detail of impedance Z, Z and Z in Figure 4 and Figure 5 . 77
1 2
Figure 7 – Example of calibration record for short-circuit test (see 9.11.2.2 j)) . 79
Figure 8 – Mechanical shock test apparatus (see 9.12.1) . 80
Figure 9 – Mechanical impact test apparatus (see 9.12.2). 81
Figure 10 – Striking element for pendulum impact test apparatus (see 9.12.2) . 82
Figure 11 – Mounting support for sample for mechanical impact test (see 9.12.2) . 83
Figure 12 – Example of mounting of unenclosed POPs for mechanical impact test (see

9.12.2) . 84
Figure 13 – Example of mounting of panel mounting type POPs for mechanical impact
test (see 9.12.2) . 85
Figure 14 – Application of force for mechanical test of rail mounted POPs (see 9.12.2) . 86
Figure 15 – Ball-pressure test apparatus (see 9.13.2) . 86
Figure 16 – Surge current impulse 8/20 µs . 87
Figure 17 – Test circuit for the surge current test . 87
Figure 18 – Example of test circuit for verification of ageing of electronic components
(see 9.17) . 88
Figure 19 – Minimum creepage distances and clearances measured in millimetres . 89

– 6 – IEC 63052:2019 © IEC 2019
Figure 20 – Minimum creepage distances and clearances as a function of peak value
of operating voltage . 90
Figure C.1 – Test arrangement . 103
Figure C.2 – Grid . 104
Figure C.3 – Grid circuit . 104
Figure E.1 – Examples of pillar terminals . 106
Figure E.2 – Examples of screw terminals and stud terminals . 107
Figure E.3 – Examples of saddle terminals . 108
Figure E.4 – Examples of lug terminals . 108
Figure G.1 – Test apparatus for the verification of the minimum I t and I values to be
p
withstood by the POP . 111
Figure H.1 – POP according to classification in 4.1 . 112

Table 1 – Limit values of break times and non-actuating times . 18
Table 2 – Rated impulse withstand voltage as a function of the nominal voltage of the

installation . 18
Table 3 – Marking and position of marking . 20
Table 4 – Standard conditions for operation in service . 23
Table 5 – Minimum clearances and creepage distances . 27
Table 6 – Connectable cross-sections of copper conductors for screw-type terminals . 31
Table 7 – Temperature-rise values . 33
Table 8 – List of type tests . 38
Table 9 – Test copper conductors corresponding to the rated currents . 39
Table 10 – Screw thread diameters and applied torques . 40
Table 11 – Pulling forces . 41
Table 12 – Test voltage of auxiliary circuits . 45
Table 13 – Test voltage for verification of impulse withstand voltage . 47
Table 14 – Test voltage for verifying the suitability for isolation, in reference to the
rated impulse withstand voltage of the POP and the altitude at which the test is
carried out . 48
Table 15 – Tests to be made to verify the behaviour of POPs under short-circuit

conditions . 52
Table 16 – Minimum values of l t and l . 54
p
Table 17 – Power factors for short-circuit tests . 55
Table 18 – Tests already covered in this document . 67
Table 19 – Tests to be applied for EMC . 68
Table 20 – Emission test conditions . 70
Table 21 – Maximum permissible temperatures under abnormal conditions . 72
Table A.1 – Test sequences for POPs classified according to 4.1.1 . 92
Table A.2 – Test sequences for POPs classified according to 4.1.2 . 93
Table A.3 – Test sequences for POPs classified according to 4.1.3 . 94
Table A.4 – Test sequences for POPs classified according to 4.1.4 . 95
Table A.5 – Number of samples for full test procedure . 96
Table A.6 – Number of samples for simplified test procedure . 97
Table F.1 – ISO and AWG copper conductor correspondence . 109

Table G.1 – Indication of silver wire diameters as a function of rated currents and
short-circuit currents . 110

– 8 – IEC 63052:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER FREQUENCY OVERVOLTAGE PROTECTION DEVICES (POPs)
FOR HOUSEHOLD AND SIMILAR APPLICATIONS

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 63052 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 International Standard is based on the following documents:
FDIS Report on voting
23E/1131/FDIS 23E/1155/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The following differing practices of a less permanent nature exist in the countries indicated
below.
5.3.6.2: In Korea, the values of 1 000 A, 1 500 A, 2 000 A, 2 500 A, 7 500 A, 9 000 A are also
considered as standard values.
6.1: In Australia, this marking is mandatory but is not required to be visible after installation.
8.2.2: In the USA, the colours red and green are not used for contact position indication.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of November 2019 have been included in this copy.

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.
– 10 – IEC 63052:2019 © IEC 2019
POWER FREQUENCY OVERVOLTAGE PROTECTION DEVICES (POPs)
FOR HOUSEHOLD AND SIMILAR APPLICATIONS

1 Scope
This document applies to devices for power frequency overvoltage protection (hereafter
referred to as "POP") for household and similar uses, with a rated frequency of 50 Hz, 60 Hz
or 50/60 Hz, with rated voltage not exceeding 230 V AC (between phase and neutral), and
with rated current not exceeding 63 A, either consisting of a functional unit in combination
with a main protective device (MPD), or as one single device having opening means able to
open the protected circuit in specified conditions.
The main protective device is a circuit-breaker, an RCCB or an RCBO.
NOTE 1 A POP, as one single device, is not a protective device to be used for automatic disconnection of the
supply within the meaning specified in IEC 60364-4-41.
POPs are intended for use in an environment with pollution degree 2 and overvoltage
category III. Devices for POPs are suitable for isolation.
POPs can be designed as a POP unit assembled to or integrated in a main protective device
by the manufacturer or as an assembly of a main protective device mechanically or
electrically coupled on site with the POP unit, or as one single POP having opening means
able to open the protected circuit in specified conditions.
POPs are intended to mitigate the effects of power frequency overvoltages between a phase
and neutral conductor (e.g. caused by loss of a neutral conductor in the three-phase supply
upstream of the POP) for downstream equipment by opening the protected circuit when an
overvoltage between phase and neutral is detected.
NOTE 2 In this context, the verb "mitigate" means that the POP will provide protection in most cases of power
frequency overvoltages.
POPs intended for monitoring one line-to-neutral conductor voltage can be used between
two-phase conductors in a phase-to-phase electrical supply system not exceeding 230 V if
both conductors are switched and declared as such by the manufacturer.
POPs according to this document are suitable for use in an IT system provided all active
conductors are switched.
This document does not apply to protection against common mode overvoltages.
This document does not apply to surge protective devices.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 60065:2014, Audio, video and similar electronic apparatus – Safety requirements
IEC 60269 (all parts), Low-voltage fuses

IEC 60364 (all parts), Low-voltage electrical installations
IEC 60384-14:2013, Fixed capacitors for use in electronic equipment – Part 14: Sectional
specification – Fixed capacitors for electromagnetic interference suppression and connection
to the supply mains
IEC 60384-14:2013/AMD1:2016
IEC 60417, Graphical symbols for use on equipment (available at: http://www.graphical-
symbols.info/equipment)
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60664-3, Insulation coordination for equipment within low-voltage systems – Part 3: Use
of coating, potting or moulding for protection against pollution
IEC 60695-2-10, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedure
IEC 60695-2-11:2014, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products (GWEPT)
IEC 60898-1:2015, Electrical accessories – Circuit-breakers for overcurrent protection for
household and similar installations – Part 1: Circuit-breakers for a.c. operation
IEC 60898-2:2016, Electrical accessories – Circuit-breakers for overcurrent protection for
household and similar installations – Part 2: Circuit-breakers for AC and DC operation
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-16:2015, Electromagnetic compatibility (EMC) – Part 4-16: Testing and
measurement techniques – Test for immunity to conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
IEC 61000-6-3, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
Emission standard for residential, commercial and light-industrial environments
IEC 61008-1:2010, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules
IEC 61008-1:2010/AMD1:2012
IEC 61008-1:2010/AMD2:2013
– 12 – IEC 63052:2019 © IEC 2019
IEC 61009-1:2010, Residual current operated circuit-breakers with integral overcurrent
protection for household and similar uses (RCBOs) – Part 1: General rules
IEC 61009-1:2010/AMD1:2012
IEC 61009-1:2010/AMD2:2013
IEC 61249-2 (all parts), Materials for printed boards and other interconnecting structures
IEC 61543:1995, Residual current-operated protective devices (RCDs) for household and
similar use – Electromagnetic compatibility
IEC 61543:1995/AMD1:2004
IEC 61543:1995/AMD2:2005
IEC 61558-1, Safety of transformers, reactors, power supply units and combinations thereof –
Part 1: General requirements and tests
IEC 61558-2 (all parts), Safety of transformers, reactors, po
...