EN 50123-2:2003

SLOVENSKI STANDARD
01-maj-2003
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SIST EN 50123-2:1998
SIST EN 50123-2:1998/A1:1998
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Railway applications - Fixed installations - D.C. switchgear -- Part 2: D.C. circuit breakers
Bahnanwendungen - Ortsfeste Anlagen - Gleichstrom-Schalteinrichtungen -- Teil 2:
Gleichstrom-Leistungsschalter
Applications ferroviaires - Installations fixes - Appareillages à courant continu -- Partie 2:
Disjoncteurs pour courant continu
Ta slovenski standard je istoveten z: EN 50123-2:2003
ICS:
29.130.99 Druge stikalne in krmilne Other switchgear and
naprave controlgear
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50123-2
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2003

ICS 29.120.60; 45.020 Supersedes EN 50123-2:1995 + A1:1996

English version
Railway applications –
Fixed installations – D.C. switchgear
Part 2: D.C. circuit breakers
Applications ferroviaires – Bahnanwendungen –
Installations fixes – Ortsfeste Anlagen –
Appareillages à courant continu Gleichstrom-Schalteinrichtungen
Partie 2: Disjoncteurs Teil 2: Gleichstrom-Leistungsschalter
pour courant continu
This European Standard was approved by CENELEC on 2002-09-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50123-2:2003 E
Foreword
This European Standard was prepared by SC 9XC, Electric supply and earthing systems for
public transport equipment and ancillary apparatus (fixed installations), of the Technical
Committee CENELEC TC 9X, Electrical and electronic applications for railways.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50123-2 on 2002-09-01.
This European Standard supersedes EN 50123-2:1995 + A1:1996. It has been prepared taking
into account IEC 61992-2 in order to align technically as much as possible this EN 50123-2
and IEC 61992-2. These documents are to be considered as technically equivalent except for
those references and peculiarities which are due to the European standardization in the
railway application field.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-09-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-09-01
This Part 2 is to be used in conjunction with EN 50123-1:2003.
Annexes designated “informative” are given for information only.
In this standard, annex A is informative.
_____________
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Contents
Page
1 Scope . 4
2 Normative references. 4
3 Definitions . 4
4 Service requirements. 4
5 Characteristics of the circuit breaker. 4
5.1 Enumeration of the characteristics. 4
5.2 Type of circuit breaker . 5
5.3 Rated values and limit values for the main circuit . 7
5.4 Control circuits . 10
5.5 Auxiliary contacts and circuits . 11
5.6 Releases . 11
5.7 Arc voltage . 12
6 Construction . 12
6.1 General. 12
6.2 Circuit breaker enclosures . 13
6.3 Temperature-rises . 14
6.4 Dielectric strength. 14
6.5 Electrical and mechanical endurance . 14
6.6 Operation . 15
6.7 Corrosion protection. 15
6.8 Noise emission. 16
6.9 Cooling . 16
6.10 Servo-control (where applicable) . 16
6.11 Other facilities . 16
7 Information and marking. 16
7.1 Information. 16
7.2 Marking . 17
8 Tests . 17
8.1 General. 17
8.2 Applicable tests and test sequence. 18
8.3 Performance of tests . 18

Annex A (informative) Information required. 25
A.1 General . 25
A.2 Procurement specification . 25
A.3 Manufacturer's specification. 25

Table 1 – Shortened type-designation. 6
Table 2 – Circuit breaker duties . 9
Table 3 – Test duty cycles. 10
Table 4 – List of applicable tests and sequence . 18
Table 5 – Verification of the behaviour of the circuit breaker when performing
test duties f, ff and fr . 23

1 Scope
This part of EN 50123 specifies requirements for d.c. circuit breakers for use in fixed
installations of traction systems.
NOTE  Switchgear assemblies, electromagnetic compatibility (EMC) and dependability are not covered in this
part of EN 50123, but by other parts of this standard or by other standards, as indicated in EN 50123-1.
2 Normative references
This European Standard incorporates by dated or undated references, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions
of any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
See EN 50123-1:2003.
3 Definitions
For the purposes of this European Standard, the terms and definitions given in EN 50123-1
apply.
4 Service requirements
Environmental conditions applicable to the equipment discussed in this standard are covered
in 4.1 of EN 50123-1.
5 Characteristics of the circuit breaker
5.1 Enumeration of the characteristics
The characteristics of a circuit breaker and its assigned designations and values (where
applicable) are covered below as follows:
• type of circuit breaker (5.2);
• rated values and limit values of the main circuit and short-circuit characteristics (5.3);
• control circuits (5.4);
• auxiliary circuits (5.5);
• releases (5.6);
• arc voltages (5.7).
- 5 - EN 50123-2:2003
5.2 Type of circuit breaker
A circuit breaker is defined by the following details, as applicable.
NOTE 1  As far as applicable, the following requirements also apply to single-pole circuit breakers electrically
or mechanically interlocked in multiple systems.
a) Interruption:
• in air;
• via a semiconductor.
NOTE 2  In this standard only interruption in air or via a semiconductor is addressed. This standard may
be used for other specified interrupting media, as far as applicable, where clearly specified by mutual
agreement between purchaser and supplier.
b) Breaking characteristics (class designation):
• high speed current limiting circuit breakers H;
• very-high speed current limiting circuit breakers V;
• semi-high speed circuit breakers S.
c) Use (installation point) in the system:
• interconnector circuit breaker I (also called bus-section or section circuit breaker);
• line circuit breaker L;
• rectifier circuit breaker R.
d) Current interruption direction:
• unidirectional U:
- fitted with a series unidirectional release U ;
- fitted with a series bidirectional release U .
NOTE 3  U circuit breakers are used for application where the reverse fault current is low (distant fault
current) and cannot operate the overload protection for normal discrimination purposes (i.e. substations
where adjacent substations are a far distance away).
• bidirectional B.
e) Duty of the main circuit
NOTE 4  To be specified when different from 5.3.4.2 and Table 2.
f) Actuating of the closing and opening operations:
• stored energy operation;
• independent manual operation;
• independent power operation;
• use of magnet;
• type of automatic tripping due to a release or relay;
• interlocks for opening and/or closing operations;
• trip-free provision;
• anti-pumping device.
g) Relay or release type:
• type of the relay(s) or release(s) involved.
h) Provision of an enclosure:
• without provision of an enclosure O (see 3.3.16 of EN 50123-1);
• with provision of an integral enclosure E (see 3.3.17 of EN 50123-1);
• with provision of a separate protection enclosure P.
The purchaser shall indicate which characteristics are to be present in the required circuit
breaker(s) and only those tests which relate to the chosen type are applicable to the selected
type of circuit breaker.
The above designations are used in this standard and may be used elsewhere adopting the
conventional grouping as given in Table 1:
Table 1 - Shortened type-designation
a a
Items above b c d h
H /I /U /O
Options V /L /U /E
S /R /B /P
Examples H/L/B/E
S/R/O
V/I/P
b
H /R and L/U
NOTE When a circuit breaker is not suitable to perform all duties as given
in 5.3.4.2, this fact will be indicated by means of the lower case letter(s)
designating actual capability according to Table 2, first column (for
example, H/Iff, fr/ P).
a
Optional designations.
b
When a circuit breaker is or shall be suitable for multiple alternate
functions, the indication of these functions shall be preceded by an «and».
Where semiconductor circuit breakers are only designed for use in rectifier equipped
substations, they shall be clearly so marked. If they may also be used as track paralleling
circuit breakers, when the substation rectifier circuit breakers are out of service, they shall
also be clearly
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