EN 50557:2011

SLOVENSKI STANDARD
01-februar-2012
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Automatic reclosing devices for circuit breakers-RCBOs-RCCBs for household and
similar uses (ARDs)
Automatisch wiedereinschaltende Einrichtungen für Leitungsschutzschalter sowie
Fehlerstrom-Schutzschalter mit und ohne eingebautem Überstromschutz (RCBOs und
RCCBs) für Hausinstallationen und für ähnliche Anwendungen (ARDs)
Prescriptions pour les dispositifs à refermeture automatique (DRA) pour disjoncteurs, ID
et DD, pour usages domestiques et analogues
Ta slovenski standard je istoveten z: EN 50557:2011
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50557
NORME EUROPÉENNE
December 2011
EUROPÄISCHE NORM
ICS 29.120.50
English version
Requirements for automatic reclosing devices (ARDs) for circuit breakers-
RCBOs-RCCBs for household and similar uses

Prescriptions pour les dispositifs à Automatisch wiedereinschaltende
refermeture automatique (DRA) pour Einrichtungen für Leitungsschutzschalter
disjoncteurs, ID et DD, pour usages sowie Fehlerstrom-Schutzschalter mit und
domestiques et analogues ohne eingebautem Überstromschutz
(RCBOs und RCCBs) für
Hausinstallationen und für ähnliche
Anwendungen (ARDs)
This European Standard was approved by CENELEC on 2011-07-19. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50557:2011 E
Contents
Foreword . 5
Introduction . 6
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Classification . 10
4.1 According to the method of construction . 10
4.2 According to the MPD . 10
4.3 According to the type of assessment means . 10
4.4 According to the safety means during the assessment . 11
4.5 According to the range of ambient air temperature (only for ARD according to 4.2.2 and
4.2.3) . 11
4.6 According to the connection to FE . 11
4.7 According to maximum number of reclosing operations . 11
4.8 According to mechanical interlock between MPD operating means and ARD
enabling/disabling system . 11
5 Characteristics . 11
5.1 Summary of characteristics . 11
5.2 Rated quantities . 12
6 Marking and other product information . 13
6.1 Standard marking . 13
6.2 Instructions for assembly and operation . 14
7 Standard conditions for operation in service . 15
7.1 General . 15
7.2 Conditions of installation . 15
7.3 Pollution degree . 15
8 Requirements for construction and operation . 15
8.1 Mechanical design . 15
8.2 Protection against electric shock . 19
8.3 Dielectric properties and isolating capability . 19
8.4 Temperature rise . 20
8.5 Mechanical and electrical endurance . 20
8.6 Performance at short-circuit currents . 20
8.7 Resistance to mechanical shock and impact . 20
8.8 Resistance to heat . 20
8.9 Resistance to abnormal heat and to fire . 20
8.10 Behaviour at low ambient air temperature . 21
8.11 Operating characteristic . 21
8.12 Assessment means for ARD according to 4.3.2 . 22
8.13 Safety in blocked condition . 23
8.14 Test device. 23
8.15 Ageing . 23
8.16 Electromagnetic compatibility (EMC) . 23
9 Tests . 23
9.1 General . 23
9.2 Test condition . 23
9.3 Measurement of the reclosing time after the tripping of the MPD . 24

– 3 – EN 50557:2011
9.4 Test of indelibility of marking . 24
9.5 Verification of the non influence of the ARD on the correct operation of the MPD . 24
9.6 Tests of creepage distances and clearances for electronic circuits (abnormal conditions) . 26
9.7 Requirements for capacitors and specific resistors and inductors used in electronic circuits . 28
9.8 Test of reliability of screws, current-carrying parts and connections . 28
9.9 Test of reliability of terminals for external conductors . 29
9.10 Verification of protection against electric shock. 29
9.11 Test of dielectric properties and isolating capability . 29
9.12 Temperature rise . 30
9.13 Verification of the mechanical and electrical endurance – Verification of the reclosing system
of the ARD . 30
9.14 Short-circuit test . 30
9.15 Resistance to mechanical shock and impact . 31
9.16 Test of resistance to heat . 31
9.17 Resistance to abnormal heat and to fire . 32
9.18 Verification of the correct operation at low ambient air temperatures for RCCBs for use at
temperatures between -25 °C and +40 °C . 32
9.19 Verification of the operating characteristics . 32
9.20 Verification of the safety during the assessment . 33
9.21 Verification of the operation of the test device at the limits of rated voltage . 34
9.22 Verification of ageing . 34
9.23 Electromagnetic compatibility . 35
Annex A (informative) Classification of ARDs according to 4.3.1 . 43
Annex B (informative) Classification of ARDs according to 4.3.2.1 a) and/or 4.3.2.2 a) . 44
Annex C (informative) Classification of ARDs according to 4.3.2.1 b) and/or 4.3.2.2 b) . 45
Annex D (normative) Number of samples for full test procedure . 46
Annex E (normative) Test sequences . 47
Annex F (informative) A-deviations . 48
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives. 49
Bibliography . 50

Figures
Figure 1 – Minimum creepage distances and clearances measured in millimetres . 37
Figure 2 – Minimum creepage distances and clearances as a function of peak value of operating
voltage . 38
Figure 3 – Verification of the reclosing subordinated to the measurements of the resistance to earth for
ARD without functional earthing (9.19.1 a) – 9.19. 1 b) – 9.20.2) . 39
Figure 4 – Verification of the reclosing subordinated to the measurements of the resistance to earth for
ARD with functional earthing (9.19.1 a) – 9.19. 1 b) – 9.20.2) . 40
Figure 5 – Verification of the reclosing subordinated to the measurements of the resistance between live
parts (9.19.2 a) – 9.19.2 b)) . 41
Figure 6 – Test circuit for the verification of the maximum current in FE under normal condition . 42
Figure A.1 – Classification of ARDs according to 4.3.1 . 43
Figure B.1 – Classification of ARDs according to 4.3.2.1 a) and/or 4.3.2.2 a) . 44
Figure C.1 – Classification of ARDs according to 4.3.2.1 b) and/or 4.3.2.2 b) . 45

Tables
Table 1 – Minimum admissible R values . 12
d
Table 2 – Minimum clearances and creepage distances . 18
Table 3 – Behaviour of the ARD in enable condition . 22
Table 4 – Maximum permissible temperatures under abnormal conditions . 27
Table 5 – Low frequency immunity test conditions . 35
Table 6 – High-frequency immunity test conditions . 36
Table 7 – Test conditions for electrostatic discharges . 36
Table D.1 – Number of samples for full test procedure . 46
Table D.2 – Additional tests for ARD already fully tested together with one kind of MPD . 46
Table E.1 – Test sequences . 47

– 5 – EN 50557:2011
Foreword
This document (EN 50557:2011) has been prepared by CLC/TC 23E "Circuit breakers and similar devices
for household and similar applications".
The following dates are fixed:
• latest date by which this document has
(dop) 2012-07-19
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national
(dow) 2014-07-19
standards conflicting with this
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission and
the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
__________
Introduction
Automatic Reclosing Devices are intended to reclose circuit-breakers-RCBOs-RCCBs after tripping in order
to re-establish continuity of service.
1 Scope
This European Standard applies to Automatic Reclosing Devices (hereinafter referred to as “ARD”) for
household and similar uses, for rated voltage not exceeding 440 V a.c. intended to be used in combination
with circuit-breakers and/or RCCBs and/or RCBOs, and designed either for factory assembly or for assembly
on site.
These devices are intended to reclose main protective devices (hereinafter referred to as “MPD”) such as
circuit-breakers complying to EN 60898-1 and/or EN 60898-2, RCCBs complying to EN 61008-1 and RCBOs
complying to EN 61009-1 after tripping of those devices in order to re-establish continuity of service.
In detail, this European Standard applies to the following types of ARD:
− ARD with assessment means, reclosing only if both the prospective line current and the prospective
earth-fault current do not exceed given values;
− ARD with assessment means, reclosing only if the prospective line current does not exceed a given value;
− ARD with assessment means, reclosing only if the prospective earth-fault current does not exceed a
given value;
− ARD that reclose without any assessment.
NOTE 1 The assessment cannot substitute the verifications required by HD 60364-6:2007.
NOTE 2 The requirements and tests for the assessment function in IT systems are under consideration.
This European Standard does not apply to ARDs with multiple settings adjustable by means accessible to
the user in normal service.
This European Standard states:
− the terms and definitions used for ARD (Clause 3);
− the classification of ARD (Clause 4);
− the characteristics of ARD (Clause 5);
− the preferred values of the operating and influencing quantities (Clause 5);
− the marking and information to be provided for ARD (Clause 6);
− the standard conditions for installation and operation in service (Clause 7);
− the requirements for construction and operation (Clause 8);
− the list of minimum requirements to be tested (Clause 9).
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.
EN 55014-1:2006 + A1:2009, Electromagnetic compatibility – Requirements for household appliances,
electric tools and similar apparatus – Part 1: Emission (CISPR 14-1:2005 + A1:2008)
EN 60065:2002 + A1:2006 + corr. Aug. 2007 + A11:2008 + A2:2010, Audio, video and similar electronic
apparatus – Safety requirements (IEC 60065:2001, mod. + A1:2005, mod. + A2:2010, mod.)

– 7 – EN 50557:2011
EN 60112:2003 + A1:2009, Method for the determination of the proof and the comparative tracking indices of
solid insulating materials (IEC 60112:2003 + A1:2009)
EN 60384-14 series, Fixed capacitors for use in electronic equipment (IEC 60384 series)
EN 60384-14:2005, Fixed capacitors for use in electronic equipment –
Part 14: Sectional specification – Fixed capacitors for electromagnetic interference suppression and
connection to the supply mains (IEC 60384-14:2005)
EN 60664-1:2007, Insulation coordination for equipment within low-voltage systems –
Part 1: Principles requirements and tests (IEC 60664-1:2007)
EN 60664-3:2003 + A1:2010, Insulation coordination for equipment within low-voltage systems –
Part 3: Use of coating, potting or moulding for protection against pollution
(IEC 60664-3:2003 + A1:2010 + corr. Nov. 2010)
EN 60898-1:2003 + corr. Feb. 2004 + A1:2004 + A11:2005 + A12:2008, Electrical accessories –
Circuit-breakers for overcurrent protection for household and similar installations –
Part 1: Circuit-breakers for a.c. operation (IEC 60898-1:2002, mod. + A1:2002, mod.)
EN 60898-2:2006, Electrical accessories – Circuit-breakers for overcurrent protection for household and
similar installations – Part 2: Circuit-breakers for a.c. and d.c. operation
(IEC 60898-2:2000, mod. + A1:2003, mod.)
EN 60947-5-1:2004 + corr. Jul. 2005 + A1:2009, Low-voltage switchgear and controlgear – Part 5-1: Control
circuit devices and switching elements – Electromechanical control circuit devices
(IEC 60947-5-1:2003 + A1:2009)
EN 60950-1:2006 + A11:2009 + A1:2010, Information technology equipment – Safety –
Part 1: General requirements (IEC 60950-1:2005, mod. + A1:2009, mod.)
EN 61008-1:2004 + A11:2007 + A12:2009, Residual current operated circuit-breakers without integral
overcurrent protection for household and similar uses (RCCBs) – Part 1: General rules
(IEC 61008-1:1996, mod. + A1:2002, mod.)
EN 61009-1:2004 + A11:2008 + A12:2009 + A13:2009, Residual current operated circuit-breakers with
integral overcurrent protection for household and similar uses (RCBOs) – Part 1: General rules
(IEC 61009-1:1996, mod. + A1:2002, mod. + corr. May 2003)
EN 61000-4-2:2009, Electromagnetic compatibility (EMC) –
Part 4-2: Testing and measurement techniques – Electrostatic discharge immunity test (IEC 61000-4-2:2008)
EN 61000-4-3:2006 + A1:2008 + A2:2010, Electromagnetic compatibility (EMC) –
Part 4-3: Testing and measurement techniques – Radiated, radio-frequency, electromagnetic field immunity
test (IEC 61000-4-3:2006 + A1:2007 + A2:2010)
EN 61000-4-4:2004 + A1:2010, Electromagnetic compatibility (EMC) –
Part 4-4: Testing and measurement techniques – Electrical fast transient/burst immunity test
(IEC 61000-4-4:2004 + A1:2010)
EN 61000-4-5:2006, Electromagnetic compatibility (EMC) –
Part 4-5: Testing and measurement techniques – Surge immunity test (IEC 61000-4-5:2005)
EN 61000-4-6:2009, Electromagnetic compatibility (EMC) –
Part 4-6: Testing and measurement techniques – Immunity to conducted disturbances, induced by radio-
frequency fields (IEC 61000-4-6:2008)
EN 61000-4-16:1998 + A1:2004 + A2:2011, 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 61000-4-16:1998 + A1:2001 + A2:2009)
EN 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 61189-2)

EN 61543:1995 + corr. Dec. 1997 + A11:2003 + A12:2005, Residual current-operated protective devices
(RCDs) for household and similar use Electromagnetic compatibility (IEC 61543:1995 + A2:2005)
EN 61558 series, Safety of power transformers, power supply units and similar products (IEC 61558 series)
EN 62019, Electrical accessories – Circuit-breakers and similar equipment for household use – Auxiliary
contact units (IEC 62019)
EN ISO 306:2004, Plastics – Thermoplastic materials – Determination of Vicat softening temperature (VST)
(ISO 306:2004)
ISO 7000:2004, Graphical symbols for use on equipment – Index and synopsis
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 60898-1:2003, EN 61008-1:2004,
EN 61009-1:2004 and the following apply.
3.1
actuator
part of the actuating system to which an external force is applied when the ARD is installed as in normal use
[IEV 441-15-22, mod.]
NOTE The actuator may take the form of a handle, knob, push-button, roller, plunger, etc.
3.2
assessment using a method based on the limitation of the test current
type of assessment that is designed in such a way that, under normal operating in tripped and blocked
conditions, the assessment is carried out by means of a non hazardous current flowing in the installation
NOTE The limit values of currents are specified in 8.12.3.
3.3
assessment using a method based on the limitation of the test voltage
type of assessment that is designed in such a way that, under normal operating in tripped and blocked
conditions, the assessment is carried out by means of a non hazardous voltage applied at the installation by
means of a transformer with a reinforced insulation between the primary and the secondary circuit
NOTE The limit values of voltage are specified in 8.12.2.
3.4
automatic reclosing
function intended to reclose, under specified conditions, the MPD after tripping
3.5
automatic reclosing device
ARD
electromechanical device intended to produce the automatic reclosing of the MPD to which is intended to be
associated with
3.6
blocked condition
condition of the ARD for which the MPD is tripped and the ARD shall not reclose it automatically
NOTE 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
3.8
disabled (condition)
condition of the ARD for which automatic reclosing function is de-activated and MPD can never be
automatically reclosed
– 9 – EN 50557:2011
3.9
earth fault current
current flowing from the live parts of the installation to earth due to an insulation fault
3.10
enabled (condition)
condition of the ARD for which automatic reclosing function is activated and MPD may be automatically
reclosed (under specific condition)
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
3.12
main protective device
MPD
device to which the ARD is intended to be associated with and that recloses under specified conditions
NOTE The MPD is a circuit-breaker (EN 60898-1 and/or EN 60898-2) or a RCCB (EN 61008-1) or a RCBO (EN 61009-1).
3.13
non operating resistance between live parts
maximum 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
maximum 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
minimum value of resistance between live parts, for which the automatic reclosing of the MPD is ensured
under specified conditions
3.16
operating resistance to earth
minimum value of resistance between live parts and earth, for which the automatic reclosing of the MPD is
ensured under specified conditions
3.17
prospective line current
current likely to flow through live parts in case of reclosing of the MPD
3.18
prospective line current assessment
assessment of the current likely to flow through
– each phase and neutral and
– each phase and each other phase and
– each phase and earth
after reclosing the MPD
NOTE This is generally achieved by evaluating the resistance.
3.19
prospective residual current
current likely to flow from the live parts of the installation to earth in case of reclosing of the MPD

3.20
prospective residual current assessments
assessment of the residual current likely to flow through:
– phase and earth and
– neutral and earth.
after reclosing the MPD
NOTE This is generally achieved by evaluating the resistance.
3.21
reset time
period of time over that the ARD reset the counting of the consecutive reclosing operations
3.22
tripped condition
condition of ARD's for which the MPD has tripped and may reclose 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 MPD
4.2.1 ARD for circuit-breakers;
4.2.2 ARD for RCCBs;
4.2.3 ARD for RCBOs.
NOTE The same ARD may 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.
NOTE 2 The same ARD may be designed with means for assessing both the prospective current according to 4.3.2.1 and 4.3.2.2.

– 11 – EN 50557:2011
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 range of ambient air temperature (only for ARD according to 4.2.2
and 4.2.3)
4.5.1 ARD for use at ambient air temperatures between -5 °C and + 40 °C;
4.5.2 ARD for use at ambient air temperatures between -25 °C and + 40 °C.
4.6 According to the connection to FE
4.6.1 ARD with FE connection for assessment means;
4.6.2 ARD without FE connection.
4.7 According to maximum number of reclosing operations
4.7.1 ARD with maximum number of reclosing operations declared by manufacturer and lower than or
equal to 3;
4.7.2 ARD with maximum number of reclosing operations declared by manufacturer and higher than 3.
4.8 According to mechanical interlock between MPD operating means and ARD
enabling/disabling system
4.8.1 ARD with mechanical interlock between MPD operating means and ARD enabling/disabling system;
4.8.2 ARD without 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: 230 V, 400 V.
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.
5.2.4 Rated non operating resistance to earth (R )
d0
The R value is stated by the manufacturer under the test conditions in this product standard.
d0
5.2.5 Rated operating resistance to earth (R )
d
The R value is stated by the manufacturer under the test conditions in this product standard.
d
The R shall be rounded up to the last two more 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
dn 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
dn
− the value of the rated residual operating current I of the associated RCD in case of ARDs classified
dn
according to 4.1.1, or
amongst all the associable RCDs in case of ARDs
− the minimum rated residual operating current I
dn
classified according to 4.1.2.
5.2.6 Rated operating resistance between live parts (R )
cc
The R value is stated by the manufacturer under the test conditions in this product standard.
cc
The R shall be rounded up to the last two more significant digits.
cc
– 13 – EN 50557:2011
The minimum R value shall be not less than:
cc
U
n
R ≥
cc
mmax
I
where
− U is the rated voltage;
n
− I is the instantaneous tripping value of the associated MPD.
m 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 ~;
e) ARD or EN 50557;
f) protection degree (only if different from IP20);
g) for ARD classified according to 4.5.2, ambient air temperature with the symbol (the value - 25
included in the snow flake symbol according to ISO 7000:2004, Figure 0027).
For devices according to 4.1.2, the information of the ambient air temperature shall not be visible after
assembly.
Moreover, the following markings shall be placed on the products or in the instruction sheets accompanying
the product:
h) the rated frequency (f ) if different from 50 Hz;
n
i) the rated non operating resistance between live parts and earth R , if applicable;
d0
j) the rated operating resistance between live parts and earth R , if applicable;
d
k) the rated non operating resistance between live parts R , if applicable;
cc0
l) the rated operating resistance between live parts R , if applicable;
cc
m) assembling method if applicable;
n) earthing system in which the devices may be used;
o) “Warning: before accessing active parts, disable the automatic reclosing function and switch off the
main protective device” or other warning having the same meaning;
NOTE It is recommended that text shall be written in appropriated language(s).
p) instructions about the reset of the ARD and the need for checking the MPD and the installation in case
of blocked condition.
Information on how to reach the isolation of the installation shall be given in the instruction sheet
accompanying the product.
The information under a) and b) shall be visible when the ARD is installed.

The information under m) is only applicable to products classified under 4.1.2.
The information under i), j), k) and l) are only applicable to products classified under 4.3.2.
The information under o) may be on the product or on a label to be installed on the board close to the ARD
and in a position visible after that the ARD has been installed.
ARDs, classified according to 4.3.1, 4.3.2.1 a) or 4.3.2.2 a) with a reclosing time, measured according to 9.3,
higher than 2 s shall be provided with indicating means showing the tripped condition of the MPD.
ARDs shall be provided with indicating means showing the blocked condition.
ARDs, classified according to 4.3.2.1 b) or 4.3.2.2 b) shall be provided with indicating means showing the
tripped condition that is maintained after the fault detection in the installation.
The blocked condition and the tripped condition shall be clearly explained by the manufacturer (e.g. by
means of an adhesive label or marking, or a light indicator) and instructions shall be given about how to reset
the ARD and the need for checking the MPD and the installation in case of blocked condition.
Marking shall be indelible, easily legible and not be placed on screws, washers or other removable parts.
Compliance is checked by inspection and by the test of 9.4.
If auxiliary contacts are present, it is necessary to provide the following indication:
− rated operational current, rated operational voltage and utilisation category if the reference standard is
the EN 62019; or
− rated current, rated voltage and opening gap, if the reference standard is the EN 60947-5-1.
For additional contacts intended for communication purpose, the reference according to EN 60950-1 shall be
used.
For the ARD classified according to 4.6.1, the FE-wire or terminal shall be identified by the marking “FE”.
The following colours are not permitted for the FE-wire: green, yellow, blue and green-and-yellow.
The manufacturers instruction shall state that the FE should be connected directly to the PE, and looping in
is not allowed.
The manufacturer shall provide the ARD power consumption data.
6.2 Instructions for assembly and operation
The manufacturer shall provide adequate instructions with the ARD.
In case of ARD classified according to 4.1.2, these instructions shall cover at least the following:
− reference to the type(s) and catalogue number(s), covering current and voltage ratings, number of
poles, etc. of the MPD with which the ARD is designed to be assembled;
− method of assembly;
− need for checking operation after assembly to verify the mechanical operation;
− ambient air temperature of the combination (MPD+ARD).
Compliance is checked by inspection.

– 15 – EN 50557:2011
7 Standard conditions for operation in service
7.1 General
The ARD complying with this European Standard shall be capable of operating under the standard
conditions given by the relevant MPD standard(s).
For the ARD+MPD, the relevant subclause of the MPD standard applies:
a) EN 60898-1:2003 and EN 60898-2:2006, Clause 7, for ARDs classified according to 4.2.1 (circuit-
breakers);
b) EN 61008-1:2004, Clause 7, for ARD classified according to 4.2.2 (RCCBs);
c) EN 61009-1:2004, Clause 7, for ARD classified according to 4.2.3 (RCBOs).
7.2 Conditions of installation
ARD shall be installed in accordance with the manufacturer's instructions.
ARD classified according to 4.1.2 shall only be installed together with the circuit-breakers, RCBOs and
RCCBs declared by the manufacturer.
7.3 Pollution degree
ARDs to this European Standard are intended for environment with pollution degree 2, i.e.: normally, only
non-conductive pollution occurs; occasionally, however, a temporary conductivity caused by condensation
may be expected.
8 Requirements for construction and operation
8.1 Mechanical design
8.1.1 General
ARD shall be so designed and constructed that, in normal use when it is assembled with the MPD, their
individual and combined performance is reliable and without danger to the user or surrounding.
ARD shall not impair safety characteristics and functions of the associated MPD.
In case of ARD classified according to 4.1.2, this device and the MPD shall be of the same manufacturer.
Compliance is checked by carrying out all the relevant tests specified.
ARD may be provided with a communication interface.
Test requirements are under consideration.
ARD shall be assembled only with main MPDs having an higher or equal range of ambient air temperature
(see 4.5).
8.1.2 Mechanism
8.1.2.1 The ARD shall be so designed and constructed not to change the functional characteristic of the MPD.
Compliance is checked by inspection and by the test of 9.5.1.
8.1.2.2 The ARD and the MPD shall be associated in a proper way and the association shall be made in
such way to avoid uncorrected matching.
Compliance is checked by inspection and with information detailed in 6.2.

8.1.2.3 For devices according to 4.8.1, it shall not be possible to enable the ARD if the MPD has been
previously manually opened by the actuator.
It is permitted that the enabling system of the ARD may also cause the closing of the MPD during the same
manual operation.
Compliance is checked by visual inspection and test of 9.5.2.
8.1.2.4 The ARD shall be provided with an enabling and disabling system.
The enabling and disabling system shall be manufactured in such a way that it can be directly operated by
the user or by means of a tool of common usage.
The enabling and disabling system shall be able to correctly operate for a suitable number of operating
cycles.
Compliance is checked by visual inspection and test of 9.5.3
8.1.2.5 Manual opening of the MPD shall be possible at every time.
This condition is considered as fulfilled if the manual opening is not possible without the disabling of the
ARD.
For devices according to 4.8.1, if the ARD is enabled, manual opening of the MPD using the actuator shall
always disable the automatic reclosing.
Compliance is checked by inspection and by the test of 9.5.2.
For devices according to 4.8.2, enabling/disabling of ARD shall be obtained by a separate enabling/disabling
means. The enabled condition shall be clearly indicated (e.g. light indicator, mechanical indicator…).
Compliance is checked by inspection.
8.1.2.6 When the ARD is disabled:
a) the MPD shall operate independently from the ARD, in particular it shall be possible to activate the test
device, if any;
b) It shall be possible to see the symbol O when the contacts of the MPD are in isolating condition.
Compliance to the point a) is checked by manual test.
Compliance to the point b) is checked by visual inspection and the dielectric tests according to 9.11 and the
measurement of the creepage and clearances distances as requested in the point 1) of the Table 2.
8.1.2.7 For devices according to 4.8.1, when the ARD is enabled:
a) it shall not be possible to see on the MPD the symbol O which shows the position of the contacts;
b) It shall be possible to activate the test device with the exception of ARD with a reclosing time higher
than 3 s where it is not accepted;
c) the marking stated in the r
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