Railway applications - Electric equipment for rolling stock - Part 4: Electrotechnical components - Rules for AC circuit-breakers

In addition to the general requirements of IEC 60077-2, this part of IEC 60077 gives rules for
AC circuit-breakers, the main contacts of which are connected to AC overhead contact lines;
the nominal voltage of these circuits being in accordance with IEC 60850.
This document, together with IEC 60077-2, states specifically:
a) the characteristics of the circuit-breakers;
b) the service conditions with which circuit-breakers comply with reference to:
– operation and behaviour in normal service;
– operation and behaviour in short-circuit;
– dielectric properties;
c) the tests for confirming the compliance of the components with the characteristics under
the service conditions and the methods to be adopted for these tests;
d) the information to be marked on, or given with the circuit-breaker.
NOTE 1 Circuit-breakers which are dealt with in this document can be provided with devices for automatic
opening under pre-determined conditions other than those of overcurrent, for example, undervoltage and reversal
of power flow direction. This document does not deal with the verification of operation under such predetermined
conditions.
NOTE 2 The incorporation of electronic components or electronic sub-assemblies into electrotechnical components
is now common practice.
Although this document is not applicable to electronic equipment, the presence of electronic components does not
provide a reason to exclude such electrotechnical components from the scope.
Electronic sub-assemblies included in the circuit-breakers comply with the relevant standard for electronics
(IEC 60571).
NOTE 3 Certain of these rules, after agreement between the user and the manufacturer, are used for
electrotechnical components installed on vehicles other than rail rolling stock such as mine locomotives,
trolleybuses, etc. In this case, particular additional requirements can be necessary.
This document does not cover industrial circuit-breakers which comply with IEC 62271-100.
For these, in order to ensure satisfactory operation, this document is used to specify only the
particular requirements for rolling stock. In such cases, a specific document states the
additional requirements with which the industrial circuit-breakers comply, for example:
– either to be adapted (e.g. for control voltage, environmental conditions, etc.);
– or to be installed and used so that they do not have to endure specific rolling stock
conditions;
– or to be additionally tested to prove that these components can withstand satisfactorily the
rolling stock conditions.

Bahnanwendungen - Elektrische Betriebsmittel auf Bahnfahrzeugen - Teil 4: Elektrotechnische Bauteile - Regeln für AC-Leistungsschalter

Applications ferroviaires - Equipements électriques pour le matériel roulant - Partie 4: Composants électrotechniques - Règles pour disjoncteurs à courant monophasé

IEC 60077-4:2019 est disponible sous forme de IEC 60077-4:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L' IEC 60077-4:2019 donne les règles relatives aux disjoncteurs à courant monophasé dont les contacts principaux sont destinés à être raccordés à des lignes aériennes de contact à courant monophasé. La tension nominale de ces circuits est conforme à l'IEC 60850. En complément de l'IEC 60077-2, le présent document précise particulièrement: a) les caractéristiques des disjoncteurs; b) les conditions de service que les disjoncteurs supportent du point de vue: - du fonctionnement et du comportement en service normal; - du fonctionnement et du comportement en cas de court-circuit; - des propriétés diélectriques; c) les essais de conformité des composants avec les caractéristiques dans les conditions de service ainsi que les méthodes d'essai correspondantes à utiliser; d) les informations à donner ou à marquer sur le disjoncteur. Cette deuxième édition annule et remplace la première édition, parue en 2003. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) les valeurs normalisées des tensions transitoires de rétablissement et la procédure d'essai sont revues; b) modification de la procédure de vérification de l'échauffement; c) ajout de l'essai d'étanchéité comme essai de type et du mesurage de la résistance d'isolement.

Železniške naprave - Električna oprema za vozna sredstva - 4. del: Elektrotehnične komponente - Pravila za močnostna stikala za izmenični tok

General Information

Status
Published
Publication Date
10-Aug-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
20-Jul-2020
Due Date
24-Sep-2020
Completion Date
11-Aug-2020

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SLOVENSKI STANDARD
SIST EN IEC 60077-4:2020
01-september-2020
Nadomešča:
SIST EN 60077-4:2003

Železniške naprave - Električna oprema za vozna sredstva - 4. del: Elektrotehnične

komponente - Pravila za močnostna stikala za izmenični tok

Railway applications - Electric equipment for rolling stock - Part 4: Electrotechnical

components - Rules for AC circuit-breakers
Bahnanwendungen - Elektrische Betriebsmittel auf Bahnfahrzeugen - Teil 4:
Elektrotechnische Bauteile - Regeln für AC-Leistungsschalter

Applications ferroviaires - Equipements électriques pour le matériel roulant - Partie 4:

Composants électrotechniques - Règles pour disjoncteurs à courant monophasé
Ta slovenski standard je istoveten z: EN IEC 60077-4:2019
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
29.280 Električna vlečna oprema Electric traction equipment
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST EN IEC 60077-4:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60077-4:2020
---------------------- Page: 2 ----------------------
SIST EN IEC 60077-4:2020
EUROPEAN STANDARD EN IEC 60077-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2019
ICS 45.060.01 Supersedes EN 60077-4:2003 and all of its amendments
and corrigenda (if any)
English Version
Railway applications - Electric equipment for rolling stock - Part
4: Electrotechnical components - Rules for AC circuit-breakers
(IEC 60077-4:2019)

Applications ferroviaires - Équipements électriques du Bahnanwendungen - Elektrische Betriebsmittel auf

matériel roulant - Partie 4: Composants électrotechniques - Fahrzeugen - Teil 4: Elektrotechnische Bauteile - Regeln für

Règles pour disjoncteurs à courant monophasé AC-Leistungsschalter
(IEC 60077-4:2019) (IEC 60077-4:2019)

This European Standard was approved by CENELEC on 2019-11-29. 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60077-4:2019 E
---------------------- Page: 3 ----------------------
SIST EN IEC 60077-4:2020
EN IEC 60077-4:2019 (E)
European foreword

The text of document 9/2538/FDIS, future edition 2 of IEC 60077-4, prepared by IEC/TC 9 "Electrical

equipment and systems for railways" was submitted to the IEC-CENELEC parallel vote and approved

by CENELEC as EN IEC 60077-4:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-08-29

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-11-29

document have to be withdrawn

This document supersedes EN 60077-4:2003 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 60077-4:2019 was approved by CENELEC as a European

Standard without any modification.
---------------------- Page: 4 ----------------------
SIST EN IEC 60077-4:2020
EN IEC 60077-4:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60060-1 2010 High-voltage test techniques - Part 1: EN 60060-1 2010
General definitions and test requirements
IEC 60077-1 2017 Railway applications - Electric equipment EN 60077-1 2017
for rolling stock - Part 1: General service
conditions and general rules
IEC 60077-2 2017 Railway applications - Electric equipment EN 60077-2 2017
for rolling stock - Part 2: Electrotechnical
components - General rules
IEC 60529 - Degrees of protection provided by - -
enclosures (IP Code)
IEC 61373 - Railway applications - Rolling stock EN 61373 -
equipment - Shock and vibration tests
IEC 62271-1 2017 High-voltage switchgear and controlgear - EN 62271-1 2017
Part 1: Common specifications for
alternating current switchgear and
controlgear
IEC 62271-100 2008 High-voltage switchgear and controlgear - EN 62271-100 2009
Part 100: Alternating current circuit-
breakers
+ A1 2012 + A1 2012
+ A2 2017 + A2 2017
IEC 62271-102 - High-voltage switchgear and controlgear -- - -
Part 102: Alternating current disconnectors
and earthing switches
---------------------- Page: 5 ----------------------
SIST EN IEC 60077-4:2020
---------------------- Page: 6 ----------------------
SIST EN IEC 60077-4:2020
IEC 60077-4
Edition 2.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Railway applications – Electric equipment for rolling stock –
Part 4: Electrotechnical components – Rules for AC circuit-breakers
Applications ferroviaires – Équipements électriques du matériel roulant –
Partie 4: Composants électrotechniques – Règles pour disjoncteurs
à courant monophasé
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 45.060.01 ISBN 978-2-8322-7508-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 60077-4:2020
– 2 – IEC 60077-4:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 7

3 Terms, definitions and abbreviated terms ........................................................................ 7

3.1 Components ........................................................................................................... 7

3.2 Component parts .................................................................................................... 8

3.3 Operational features ............................................................................................... 9

3.4 Making and breaking characteristics ..................................................................... 10

3.5 Abbreviated terms ................................................................................................. 12

4 Classification ................................................................................................................. 12

5 Characteristics .............................................................................................................. 13

5.1 Summary of characteristics ................................................................................... 13

5.2 Type of circuit-breaker .......................................................................................... 13

5.3 Rated values and limiting values for the main circuit ............................................. 13

5.3.1 General ......................................................................................................... 13

5.3.2 Rated voltages .............................................................................................. 13

5.3.3 Rated currents ............................................................................................... 13

5.3.4 Rated operational frequency .......................................................................... 14

5.3.5 Rated power factors....................................................................................... 14

5.3.6 Short-circuit characteristics ........................................................................... 14

5.4 Operational frequencies ........................................................................................ 16

5.5 Electric and pneumatic control circuits .................................................................. 16

5.6 Electric and pneumatic auxiliary circuits ................................................................ 17

5.7 Overcurrent release .............................................................................................. 17

5.8 Recovery voltages ................................................................................................ 17

6 Product information ....................................................................................................... 17

6.1 Component documentation ................................................................................... 17

6.2 Marking ................................................................................................................. 17

7 Normal service conditions .............................................................................................. 17

8 Constructional and performance requirements ............................................................... 17

8.1 Constructional requirements ................................................................................. 17

8.2 Performance requirements .................................................................................... 18

8.2.1 Operating conditions ...................................................................................... 18

8.2.2 Temperature limits ......................................................................................... 18

8.2.3 Operation following inactivity ......................................................................... 18

8.2.4 Electromagnetic compatibility (EMC) ............................................................. 18

8.2.5 Acoustic noise emission ................................................................................ 18

8.2.6 Clearances .................................................................................................... 18

8.2.7 Creepage distances ....................................................................................... 18

8.2.8 Switching overvoltages .................................................................................. 18

8.2.9 Operational performance capability ................................................................ 18

8.2.10 Ability to withstand vibration and shock ......................................................... 19

8.2.11 Ability to make and break under short-circuit conditions ................................. 19

9 Tests ............................................................................................................................. 19

9.1 Kind of tests .......................................................................................................... 19

---------------------- Page: 8 ----------------------
SIST EN IEC 60077-4:2020
IEC 60077-4:2019 © IEC 2019 – 3 –

9.1.1 General ......................................................................................................... 19

9.1.2 Type tests ...................................................................................................... 20

9.1.3 Routine tests ................................................................................................. 20

9.1.4 Investigation tests .......................................................................................... 20

9.2 Verification of constructional requirements ............................................................ 20

9.2.1 General ......................................................................................................... 20

9.2.2 Type tests ...................................................................................................... 20

9.2.3 Routine tests ................................................................................................. 20

9.3 Type tests for verification of performance requirements ........................................ 20

9.3.1 Test sequences ............................................................................................. 20

9.3.2 General test conditions .................................................................................. 21

9.3.3 Test sequence I: General performance characteristics ................................... 22

9.3.4 Test sequence II: Rated short-circuit making and breaking capacities ............ 23

9.3.5 Test sequence III: Ability to withstand vibration and shock ............................. 25

9.3.6 Test sequence IV: Climatic conditions ........................................................... 26

9.3.7 Test sequence V: Other tests ......................................................................... 26

9.4 Routine tests for verification of performance requirements .................................... 26

9.4.1 General ......................................................................................................... 26

9.4.2 Functional test ............................................................................................... 26

9.4.3 Calibration of releases ................................................................................... 27

9.4.4 Air-tightness (for pneumatic circuit-breaker) .................................................. 27

9.4.5 Dielectric withstand ....................................................................................... 27

Annex A (informative) Test circuit to verify the making and breaking capacities ................... 28

Annex B (informative) Determination of short-circuit making and breaking currents,

and of percentage DC component ......................................................................................... 29

Bibliography .......................................................................................................................... 30

Figure A.1 – Diagram of the test circuit ................................................................................. 28

Figure B.1 – Determination of short-circuit making and breaking currents, and of

percentage DC components .................................................................................................. 29

Table 1 – Standard values of transient recovery voltage – Representation by two

parameters ........................................................................................................................... 16

Table 2 – Operational performance capability ....................................................................... 19

Table 3 – List of type test sequences for performance requirements ..................................... 21

Table 4 – Tolerances on test values ...................................................................................... 22

Table 5 – Standard values of prospective transient recovery voltage – Representation

by two parameters ................................................................................................................ 24

---------------------- Page: 9 ----------------------
SIST EN IEC 60077-4:2020
– 4 – IEC 60077-4:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS –
ELECTRIC EQUIPMENT FOR ROLLING STOCK –
Part 4: Electrotechnical components –
Rules for AC circuit-breakers
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 60077-4 has been prepared by IEC technical committee 9:

Electrical equipment and systems for railways.

This second edition cancels and replaces the first edition, issued in 2003. It constitutes a

technical revision.

This edition includes the following main technical changes with regard to the previous edition:

a) standard values of transient recovery voltages and test procedure are reviewed;

b) procedure of verification of temperature rise is changed;
c) air-tightness test as type test, insulation resistance measurement are added.
---------------------- Page: 10 ----------------------
SIST EN IEC 60077-4:2020
IEC 60077-4:2019 © IEC 2019 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
9/2538/FDIS 9/2554/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.

This document should be read in conjunction with IEC 60077-1 and IEC 60077-2.

A list of all parts in the IEC 60077 series, published under the general title Railway

applications – Electric equipment for rolling stock, can be found on the IEC website.

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.
---------------------- Page: 11 ----------------------
SIST EN IEC 60077-4:2020
– 6 – IEC 60077-4:2019 © IEC 2019
RAILWAY APPLICATIONS –
ELECTRIC EQUIPMENT FOR ROLLING STOCK –
Part 4: Electrotechnical components –
Rules for AC circuit-breakers
1 Scope

In addition to the general requirements of IEC 60077-2, this part of IEC 60077 gives rules for

AC circuit-breakers, the main contacts of which are connected to AC overhead contact lines;

the nominal voltage of these circuits being in accordance with IEC 60850.
This document, together with IEC 60077-2, states specifically:
a) the characteristics of the circuit-breakers;
b) the service conditions with which circuit-breakers comply with reference to:
– operation and behaviour in normal service;
– operation and behaviour in short-circuit;
– dielectric properties;

c) the tests for confirming the compliance of the components with the characteristics under

the service conditions and the methods to be adopted for these tests;
d) the information to be marked on, or given with the circuit-breaker.

NOTE 1 Circuit-breakers which are dealt with in this document can be provided with devices for automatic

opening under pre-determined conditions other than those of overcurrent, for example, undervoltage and reversal

of power flow direction. This document does not deal with the verification of operation under such predetermined

conditions.

NOTE 2 The incorporation of electronic components or electronic sub-assemblies into electrotechnical compo-

nents is now common practice.

Although this document is not applicable to electronic equipment, the presence of electronic components does not

provide a reason to exclude such electrotechnical components from the scope.

Electronic sub-assemblies included in the circuit-breakers comply with the relevant standard for electronics

(IEC 60571).

NOTE 3 Certain of these rules, after agreement between the user and the manufacturer, are used for

electrotechnical components installed on vehicles other than rail rolling stock such as mine locomotives,

trolleybuses, etc. In this case, particular additional requirements can be necessary.

This document does not cover industrial circuit-breakers which comply with IEC 62271-100.

For these, in order to ensure satisfactory operation, this document is used to specify only the

particular requirements for rolling stock. In such cases, a specific document states the

additional requirements with which the industrial circuit-breakers comply, for example:

– either to be adapted (e.g. for control voltage, environmental conditions, etc.);

– or to be installed and used so that they do not have to endure specific rolling stock

conditions;

– or to be additionally tested to prove that these components can withstand satisfactorily the

rolling stock conditions.
---------------------- Page: 12 ----------------------
SIST EN IEC 60077-4:2020
IEC 60077-4:2019 © IEC 2019 – 7 –
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 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test

requirements

IEC 60077-1:2017, Railway applications – Electric equipment for rolling stock. – Part 1:

General service conditions and general rules

IEC 60077-2:2017, Railway applications – Electric equipment for rolling stock. – Part 2:

Electrotechnical components – General rules
IEC 60529, Degrees of protection provided by enclosures (IP Code)

IEC 61373, Railway applications – Rolling stock equipment – Shock and Vibration tests

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear

IEC 62271-100:2008, High-voltage switchgear and controlgear – Part 100: Alternating current

circuit-breakers
IEC 62271-100:2008/AMD1:2012
IEC 62271-100:2008/AMD2:2017

IEC 62271-102, High-voltage switchgear and controlgear – Part 102: Alternating current

disconnectors and earthing switches
3 Terms, definitions and abbreviated terms

For the purposes of this document, the terms and definitions given in Clause 3 of

IEC 60077-1:2017 and Clause 3 of IEC 60077-2:2017, 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 Components
3.1.1
indoor circuit-breaker

circuit-breaker designed solely for protected installation against wind, rain, snow, abnormal

dirt deposits, abnormal conditions, ice and hoarfrost
3.1.2
outdoor circuit-breaker

circuit-breaker suitable for installation in open air, i.e. capable of withstanding wind, rain,

snow, dirt deposits, condensation, ice and hoarfrost
---------------------- Page: 13 ----------------------
SIST EN IEC 60077-4:2020
– 8 – IEC 60077-4:2019 © IEC 2019
3.1.3
oil circuit-breaker
circuit-breaker in which the contacts open and close in oil

Note 1 to entry: Typical examples of oil circuit-breakers are live tank minimum oil circuit-breakers and dead tank

bulk oil circuit-breakers.
[SOURCE: IEC 60050-441:1984/AMD1:2000, 441-14-28]
3.1.4
vacuum circuit-breaker

circuit-breaker in which the contacts open and close within a highly evacuated envelope

[SOURCE: IEC 60050-441:1984/AMD1:2000, 441-14-29]
3.1.5
air-blast circuit-breaker,
circuit-breaker in which the contacts open in a blast of air

[SOURCE: IEC 60050-441:1984/AMD1:2000, 441-14-32, modified – “gas-blast” has been

deleted. “the gas used is air” has been replaced with “the contacts open in a blast of air”.]

3.1.6
air circuit-breaker
circuit-breaker in which the contacts open and close in air
3.1.7
gas circuit-breaker

circuit-breaker in which the contacts open and close in a gas other than air at atmospheric or

higher pressure

Note 1 to entry: An example of a gas circuit-breaker is the sulphur hexafluoride circuit-breaker.

3.1.8
semiconductor circuit-breaker

circuit-breaker designed to make and break the current in an electric circuit by means of the

controlled conductivity of a semiconductor

Note 1 to entry: There can be mechanical contacts associated with these semiconductor devices.

[SOURCE: IEC 60050-811:2017, 811-29-42]
3.2 Component parts
3.2.1
release,

device which releases the holding means and permits the opening or closing of the circuit-

breaker

Note 1 to entry: A circuit-breaker can be activated by several releases each becoming operational according to

specified conditions.

Note 2 to entry: These releases can be mechanically or electrically connected to the switching device.

[SOURCE: IEC 60050-811:2017, 811-29-44]
3.2.2
overcurrent release

release which permits a mechanical switching device to open with or without time-delay when

the current in the release exceeds a predetermined value
---------------------- Page: 14 -------------------
...

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