IEC 63024:2017

Requirements for automatic reclosing devices (ARDs) for circuit breakers, RCBOs-RCCBs for household and similar uses

IEC 63024:2017 applies to automatic reclosing devices (ARDs) for household and similar uses, for rated voltage not exceeding 440 V AC, and which are intended to be used in combination with circuit-breakers, RCCBs and RCBOs, and designed either for factory assembly or for assembly on site.
These devices are intended to reclose main protective devices (MPDs) such as circuit-breakers complying with IEC 60898-1 and/or IEC 60898-2, RCCBs complying with IEC 61008-1 and/or IEC 62423, and RCBOs complying with IEC 61009-1 and/or IEC 62423 after tripping of those devices in order to re-establish continuity of service.

Exigences pour les dispositifs à refermeture automatique (DRA) pour disjoncteurs, ID et DD, pour usages domestiques et analogues

L'IEC 63024:2017 s’applique aux dispositifs de refermeture automatique (DRA) pour usages domestiques et analogues, à des tensions assignées de 440 V c.a au maximum, et qui sont destinés à être utilisés conjointement avec des disjoncteurs, des ID et des DD. Ces dispositifs sont conçus pour un montage en usine ou sur site.
Ces dispositifs sont destinés à refermer des dispositifs de protection principaux (DPP) tels que les disjoncteurs conformes à l’IEC 60898-1 et/ou à l’IEC 60898-2, les ID conformes à l’IEC 61008-1 et/ou à l’IEC 62423, ainsi que les DD conformes à l’IEC 61009-1 et/ou à l’IEC 62423 après un déclenchement de ces dispositifs, afin de rétablir la continuité du service.

General Information

• Status: Published
• Publication Date: 12-Dec-2017
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: SC 23E - Circuit-breakers and similar equipment for household use
• Current Stage: PPUB - Publication issued
• Start Date: 05-Jan-2018
• Completion Date: 13-Dec-2017

Standards Content (Sample)

IEC 63024 ®
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Requirements for automatic reclosing devices (ARDs) for circuit-breakers,
RCBOs and RCCBs for household and similar uses

Exigences pour les dispositifs à refermeture automatique (DRA) pour
disjoncteurs, ID et DD, pour usages domestiques et analogues
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IEC 63024 ®
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Requirements for automatic reclosing devices (ARDs) for circuit-breakers,

RCBOs and RCCBs for household and similar uses

Exigences pour les dispositifs à refermeture automatique (DRA) pour

disjoncteurs, ID et DD, pour usages domestiques et analogues

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-5132-4

– 2 – IEC 63024:2017 © IEC 2017
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 Classification . 13
4.1 According to the method of construction . 13
4.2 According to the associated MPD . 13
4.3 According to the type of assessment means . 13
4.4 According to the safety means during the assessment . 14
4.5 According to the connection to FE . 14
4.6 According to maximum number of reclosing operations . 14
4.7 According to mechanical interlock between MPD operating means and ARD
enabling/disabling system . 14
5 Characteristics . 14
5.1 Summary of characteristics . 14
5.2 Rated quantities . 14
5.2.1 Rated voltage . 14
5.2.2 Rated operational voltage (U ) . 15
e
5.2.3 Rated frequency . 15
5.2.4 Rated non-operating resistance to earth (R ) . 15
d0
5.2.5 Rated operating resistance to earth (R ) . 15
d
5.2.6 Rated non-operating resistance between live parts (R ) . 15
cc0
5.2.7 Rated operating resistance between live parts (R ) . 16
cc
6 Marking and other product information . 16
6.1 Standard marking . 16
6.2 Instructions for assembly and operation . 17
7 Standard conditions for operation in service . 18
7.1 General . 18
7.2 Conditions of installation . 18
7.3 Pollution degree . 18
8 Requirements for construction and operation . 18
8.1 Mechanical design . 18
8.1.1 General . 18
8.1.2 Mechanism . 19
8.1.3 Clearances and creepage distances . 20
8.1.4 Clearances and creepage distances for electronic circuits connected
between live parts or between live parts and the earth . 20
8.1.5 Screws, current-carrying parts and connections . 22
8.1.6 Terminals for external conductors . 22
8.2 Protection against electric shock. 22
8.3 Dielectric properties and isolating capability . 23
8.4 Temperature rise . 23
8.5 Mechanical and electrical endurance . 23
8.6 Performance at short-circuit currents . 23
8.7 Resistance to mechanical shock and impact. 23

8.8 Resistance to heat. 23
8.9 Resistance to abnormal heat and to fire . 24
8.10 Operating characteristics . 24
8.11 Assessment means for ARD according to 4.3.2 . 25
8.11.1 General . 25
8.11.2 Assessment means operating by limitation of the test voltage . 25
8.11.3 Assessment means operating by limitation of the test current . 25
8.12 Safety in blocked condition . 26
8.13 Test device . 26
8.14 Ageing . 26
8.15 Electromagnetic compatibility (EMC). 26
9 Tests . 26
9.1 General . 26
9.2 Test condition . 26
9.3 Measurement of the reclosing time after the tripping of the MPD . 27
9.4 Test of indelibility of marking . 27
9.5 Verification of the non-influence of the ARD on the correct operation of the
MPD . 27
9.5.1 Verification of the operating characteristics of the MPD . 27
9.5.2 Verification of the impossibility of the activation of the ARD when the
MPD has been manually opened . 28
9.5.3 Verification of the enabling/disabling system of the ARD. 28
9.5.4 Verification of the maximum number of consecutive reclosings . 28
9.6 Tests of creepage distances and clearances for electronic circuits (abnormal
conditions) . 29
9.7 Requirements for capacitors, specific resistors and inductors used in
electronic circuits . 32
9.7.1 General . 32
9.7.2 Capacitors . 32
9.7.3 Resistors . 32
9.7.4 Inductors and windings . 33
9.8 Test of reliability of screws, current-carrying parts and connections . 33
9.9 Test of reliability of terminals for external conductors . 33
9.10 Verification of protection against electric shock . 33
9.11 Test of dielectric properties and isolating capability . 33
9.12 Temperature rise . 34
9.13 Verification of the mechanical and electrical endurance – Verification of the
reclosing system of the ARD . 34
9.13.1 General test conditions . 34
9.13.2 Test procedure . 34
9.13.3 Condition of the ARD after the test . 34
9.14 Short-circuit test . 35
9.14.1 General conditions for short-circuit test. 35
9.14.2 Test circuit and test quantities . 35
9.14.3 Test procedure . 35
9.14.4 Condition of the ARD after the test . 35
9.15 Resistance to mechanical shock and impact . 36
9.16 Test of resistance to heat . 36
9.17 Resistance to abnormal heat and to fire . 36
9.18 Verification of the operating characteristics . 36

– 4 – IEC 63024:2017 © IEC 2017
9.18.1 General . 36
9.18.2 Verification of the reclosing subordinated to the measurements of the
resistance to earth . 36
9.18.3 Verification of the reclosing subordinated to the measurements of the
resistance between live parts . 37
9.18.4 Verification of the influence of the distributed capacities in the
installation on the operating characteristic . 37
9.18.5 Verification of the maximum current in FE under normal condition . 37
9.19 Verification of the safety during the assessment . 38
9.19.1 Verification of the limitation of the voltage . 38
9.19.2 Verification of the limitation of the test current . 38
9.19.3 Verification of the safety in blocked condition . 38
9.20 Verification of the operation of the test device at the limits of rated voltage . 39
9.21 Verification of ageing . 39
9.22 Electromagnetic compatibility . 39
9.22.1 General . 39
9.22.2 Low-frequency electromagnetic phenomena . 39
9.22.3 High-frequency immunity . 40
9.22.4 Electrostatic discharges . 41
9.22.5 Electromagnetic emission of ARDs . 41
9.22.6 Performance criteria . 41
Annex A (informative) Classification of ARDs according to 4.3.1 . 48
Annex B (informative) Classification of ARDs according to 4.3.2.1 a) and/or 4.3.2.2 a) . 49
Annex C (informative) Classification of ARDs according to 4.3.2.1 b) and/or 4.3.2.2 b) . 50
Annex D (normative) Test sequences and number of samples to be submitted for
verification of conformity . 51
Bibliography . 54

Figure 1 – Minimum creepage distances and clearances measured . 42
Figure 2 – Minimum creepage distances and clearances as a function of peak value of
operating voltage . 43
Figure 3 – Verification of the reclosing subordinated to the measurements of the
resistance to earth for ARD without functional earthing (9.18.2 a), 9.18.2 b) and 9.19.2) . 44
Figure 4 – Verification of the reclosing subordinated to the measurements of the
resistance to earth for ARD with functional earthing (9.18.2 a), 9.18.2 b) and 9.19.2) . 45
Figure 5 – Verification of the reclosing subordinated to the measurements of the
resistance between live parts (9.18.3 a) and 9.18.3 b)) . 46
Figure 6 – Test circuit for the verification of the maximum current in FE under normal
condition . 47
Figure A.1 – Classification of ARDs according to 4.3.1. 48
Figure B.1 – Classification of ARDs according to 4.3.2.1 a) and/or 4.3.2.2 a) . 49
Figure C.1 – Classification of ARDs according to 4.3.2.1 b) and/or 4.3.2.2 b) . 50

Table 1 – Minimum admissible R values . 15

d
Table 2 – Minimum clearances and creepage distances . 21
Table 3 – Behaviour of the ARD in enable condition . 25
Table 4 – Maximum permissible temperatures under abnormal conditions . 31
Table 5 – Low frequency immunity test conditions . 40

Table 6 – High-frequency immunity test conditions . 40
Table 7 – Test conditions for electrostatic discharges . 41
Table D.1 – Test sequences . 51
Table D.2 – Number of samples for full test procedure . 52
Table D.3 – Additional tests for ARD already fully tested together with one kind of MPD . 53

– 6 – IEC 63024:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
REQUIREMENTS FOR AUTOMATIC RECLOSING DEVICES (ARDs)
FOR CIRCUIT-BREAKERS, RCBOs AND RCCBs
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
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6) All users should ensure that they have the latest edition of this publication.
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 63024 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/1037/FDIS 23E/1038/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 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.
– 8 – IEC 63024:2017 © IEC 2017
INTRODUCTION
Automatic reclosing devices (ARDs) are intended to reclose circuit-breakers, RCBOs, and RCCBs
after tripping in order to re-establish continuity of service.

REQUIREMENTS FOR AUTOMATIC RECLOSING DEVICES (ARDs)
FOR CIRCUIT-BREAKERS, RCBOs AND RCCBs
FOR HOUSEHOLD AND SIMILAR USES

1 Scope
This International Standard applies to automatic reclosing devices (ARDs) for household and
similar uses, for rated voltage not exceeding 440 V AC, and which are intended to be used in
combination with circuit-breakers, RCCBs and RCBOs, and designed either for factory
assembly or for assembly on site.
These devices are intended to reclose main protective devices (MPDs) such as circuit-breakers
complying with IEC 60898-1 and/or IEC 60898-2, RCCBs complying with IEC 61008-1 and/or
IEC 62423, and RCBOs complying with IEC 61009-1 and/or IEC 62423 after tripping of those
devices in order to re-establish continuity of service.
This document includes the following types of ARDs:
– ARDs with assessment means, reclosing only if both the prospective line current and the
prospective earth-fault current do not exceed given values;
– ARDs with assessment means, reclosing only if the prospective line current does not exceed a
given value;
– ARDs with assessment means, reclosing only if the prospective earth-fault current does
not exceed a given value;
– ARDs that recloses without any assessment.
NOTE 1 Installation rules define the condition of use of each of the products and the types.
NOTE 2 The assessment cannot substitute the verifications required by IEC 60364-6.
NOTE 3 The requirements and tests for the assessment function in IT systems are under consideration.
This document does not apply to ARDs with multiple settings adjustable by means accessible
to the user in normal service.
Devices covered by this document are intended to be suitable for operation by uninstructed
persons without the need for maintenance.
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 60384 (all parts), Fixed capacitors for use in electronic equipment
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

– 10 – IEC 63024:2017 © IEC 2017
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 60947-5-1, Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices
and switching elements – Electromechanical control circuit devices
IEC 60950-1, Information technology equipment – Safety – Part 1: General requirements
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, 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, 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 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
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 61189-2, Test methods for electrical materials, printed boards and other interconnection
structures and assemblies – Part 2: Test methods for materials for interconnection 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 (all parts), Safety of transformers, reactors, power supply units and combinations
thereof
IEC 62019, Electrical accessories – Circuit-breakers and similar equipment for household use
– Auxiliary contact units
CISPR 14-1, Electromagnetic compatibility – Requirements for household appliances, electric
tools and similar apparatus – Part 1: Emission

3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60898-1,
IEC 62873-2 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
actuator
part of the actuating system to which an external force is applied when the ARD is installed as
in normal use
Note 1 to entry: Only the actuator may take the form of a handle, knob, push-button, roller, plunger, etc.
[SOURCE: IEC 60050-441:1984, 441-15-22, modified – Adapted for ARDs]
3.2
assessment
type of assessment carried out by means of a non-
hazardous current injected into the disconnected part of the installation
Note 1 to entry: The limit values of currents are specified in 8.11.3.
3.3
assessment
type of assessment carried out by means of a non-
hazardous voltage applied to the disconnected part of the installation
Note 1 to entry: The limit values of voltage are specified in 8.11.2.
3.4
automatic reclosing
automatic reclosing function
function intended to cause the main protective device (MPD) to reclose, under specified
conditions, after tripping
3.5
automatic reclosing device
ARD
device intended to produce the automatic reclosing of the MPD to which it is associated
3.6
blocked condition
condition of the ARD for which the MPD is tripped and the ARD shall not reclose it
automatically
Note 1 to entry: This condition can be removed only by manual reset operation according to the manufacturer’s
instructions.
3.7
consecutive reclosing operations
number of consecutive reclosing operations that leads the ARD in blocked condition within a
period of time
– 12 – IEC 63024:2017 © IEC 2017
3.8
disabled, adj
condition of the ARD for which an automatic reclosing function is de-activated and the MPD
can never be automatically reclosed
3.9
earth-fault current
current flowing to earth due to an insulation fault
[SOURCE: IEC 60050-442:1998, 442-01-23]
3.10
enabled, adj
condition of the ARD for which a n automatic reclosing function is activated
3.11
functional earth
FE
wire or terminal intended to be connected to the PE so as to provide a reference point to
the ARD for assessment means
Note 1 to entry: This note applies to the French language only.
3.12
main protective device
MPD
device to which the ARD is intended to be associated and that will be reclosed by the ARD
Note 1 to entry: The MPD is a circuit-breaker (IEC 60898-1 and/or IEC 60898-2), an RCCB (IEC 61008-1 and
IEC 62423) or an RCBO (IEC 61009-1 and IEC 62423).
3.13
non-operating resistance between live parts
value of resistance between live parts, below which the automatic reclosing of the MPD is
not permitted under specified conditions
3.14
non-operating resistance to earth
value of resistance between live parts and earth below which the automatic reclosing of the
MPD is not permitted under specified conditions
3.15
operating resistance between live parts
value of resistance between live parts above which the automatic reclosing of the MPD is
permitted under specified conditions
3.16
operating resistance to earth
value of resistance between live parts and earth above which the automatic reclosing of the
MPD is permitted under specified conditions
3.17
prospective current
current that would flow in the circuit if each pole of the switching device or the fuse were
replaced by a conductor of negligible impedance
[SOURCE: IEC 60050-441:1984, 441-17-01, modified – In the title, “(of a circuit and with
respect to a switching device or a fuse)” has been removed as well as the Note 1 to entry.]

3.18
prospective line current assessment
assessment of the current likely to flow through each phase and neutral of the MPD after
reclosing
3.19
prospective residual current assessment
assessment of the current likely to flow through the MPD to earth after reclosing the MPD
3.20
reset time
period of time after which the ARD resets the counting of the consecutive reclosing operations
3.21
tripped condition
condition of ARDs for which the MPD has tripped and may be reclosed automatically under
specified conditions
4 Classification
4.1 According to the method of construction
4.1.1 ARD assembled in factory by the manufacturer.
NOTE This also includes built-in devices.
4.1.2 ARD assembled on site.
4.2 According to the associated MPD
4.2.1 ARD for circuit-breakers.
4.2.2 ARD for RCCBs.
4.2.3 ARD for RCBOs.
NOTE The same ARD can be designed for more than one MPD.
4.3 According to the type of assessment means
4.3.1 ARD without assessment means (see Annex A).
4.3.2 ARD with assessment means.
4.3.2.1 ARD with means of assessment of the prospective residual current:
a) operation blocked after assessment of an excessive residual current in the installation
(see Annex B);
b) remains in tripped condition after the assessment of an excessive residual current in the
installation (see Annex C).
4.3.2.2 ARD with means of assessment of the prospective line current:
a) operation blocked after assessment of an overcurrent in the installation (see Annex B);
b) remains in tripped condition after the assessment of an overcurrent in the installation (see
Annex C).
NOTE 1 The behaviour according to 4.3.2.1 b) and 4.3.2.2 b) is defined in the manufacturer’s instructions.

– 14 – IEC 63024:2017 © IEC 2017
NOTE 2 The same ARD can be designed with means for assessing both the prospective current according to 4.3.2.1
and 4.3.2.2.
4.4 According to the safety means during the assessment
4.4.1 ARD with assessment means operating by using a method based on the limitation of
the test voltage.
4.4.2 ARD with assessment means operating by using a method based on the limitation of
the test current.
4.5 According to the connection to FE
4.5.1 ARD with FE connection for assessment means.
4.5.2 ARD without FE connection.
4.6 According to maximum number of reclosing operations
4.6.1 ARD with maximum number of reclosing operations declared by manufacturer and
lower than or equal to 3.
4.6.2 ARD with maximum number of reclosing operations declared by manufacturer and
higher than 3.
4.7 According to mechanical interlock between MPD operating means and ARD
enabling/disabling system
4.7.1 ARD with mechanical interlock between MPD operating means and ARD
enabling/disabling system.
4.7.2 ARD without mechanical interlock between MPD operating means and ARD
enabling/disabling system.
5 Characteristics
5.1 Summary of characteristics
The characteristics of the MPD standards and the following apply:
– protection against external influences;
– method of mounting;
– method of connection;
– value of rated operational voltage;
– value of rated frequency;
– values of operating and non-operating rated resistance to earth, if applicable;
– values of operating and non-operating rated resistance between live parts, if applicable;
– range of ambient air temperature.
5.2 Rated quantities
5.2.1 Rated voltage
Preferred values of rated voltage are: 120 V, 230 V, 400 V.
Wherever in this document there is a reference to 230 V or 400 V, they can be read as 220 V
or 240 V, 380 V or 415 V, respectively.

5.2.2 Rated operational voltage (U )
e
The rated operational voltage (hereafter referred to as rated voltage) of an ARD is the
value of voltage assigned by the manufacturer to which its performance is referred.
5.2.3 Rated frequency
The rated frequency of an ARD is the power frequency for which the ARD is designed and
to which the values of the other characteristics correspond.
Preferred values of rated frequency are: 50 Hz, 60 Hz and 50/60 Hz.
5.2.4 Rated non-operating resistance to earth (R )
d0
The R is the rated value of resistance between live parts and earth below which the re-
d0
closing of the MPD is not permitted.
The R value is stated by the manufacturer under the test conditions in this product document.

d0
)
5.2.5 Rated operating resistance to earth (R
d
The R is the rated value of resistance between live parts and earth above which the re-
d
closing of the MPD is permitted.
The R value is stated by the manufacturer under the test conditions in this product document.

d
The R shall be rounded up to the two significant digits.

d
The minimum R value shall be not less than the values specified in Table 1:

d
Table 1 – Minimum admissible R values

d
I R
∆n d
A Ω
0,01 25 000
0,03 8 000
0,1 2 500
0,3 800
0,5 500
1 250
where I is:
∆n
– the value of the rated residual operating current I of the associated RCD in case of

∆n
ARDs classified according to 4.1.1; or
– the minimum rated residual operating current I amongst all the associable RCDs in

∆n
case of ARDs classified according to 4.1.2.
5.2.6 Rated non-operating resistance between live parts (R )
cc0
The R is the rated value of resistance between live parts below which the reclosing of the
cc0
MPD is not permitted.
The R value is stated by the manufacturer under the test conditions in this product
cc0
document.
– 16 – IEC 63024:2017 © IEC 2017
The R value shall be rounded up to the two significant digits.
cc0
5.2.7 Rated operating resistance between live parts (R )
cc
The R is the rated value of resistance between live parts above which the reclosing of the
cc
MPD is permitted.
The R value is stated by the manufacturer under the test conditions in this product document.

cc
The R shall be rounded up to the last two more significant digits.

cc
The minimum R value shall be not less than:
cc
U
n
R ≥
cc
I
i max
where:
– U is the rated voltage;
n
– I is the upper value of the instantaneous tripping of the associated MPD.

i max
6 Marking and other product information
6.1 Standard marking
Each ARD shall be marked in a durable manner with all the following data:
a) manufacturer’s name or trade mark;
b) type designation, catalogue number or serial number;
c) wiring diagram, except if the connection mode is self-evident;
d) rated voltage(s) with the symbol (IEC 60417-5032);
e) ARD or according to the IEC reference standard;
f) protection degree (only if different from IP20).
Moreover, the following markings shall be placed on the products or in the instruction sheets
accompanying the product:
g) the rated frequency; ARDs with more than one rated frequency (e.g. 50/60 Hz) shall be
marked accordingly;
h) the rated non
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