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EUROPEAN STANDARD EN 62271-107
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2005

ICS 29.130.10
English version
High-voltage switchgear and controlgear
Part 107: Alternating current fused circuit-switchers for rated voltages
above 1 kV up to and including 52 kV
(IEC 62271-107:2005)
Appareillage à haute tension Hochspannungs-Schaltgeräte und
Partie 107: Circuits-switchers fusiblés -Schaltanlagen
pour courant alternatif de tension Teil 107: Wechselstrom-
assignée supérieure à 1 kV et jusqu'à Leistungsschalter-Sicherungs-
52 kV inclus Kombinationen für
(CEI 62271-107:2005) Bemessungsspannungen über 1 kV
bis einschließlich 52 kV
(IEC 62271-107:2005)
This European Standard was approved by CENELEC on 2005-10-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, 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

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62271-107:2005 E
Foreword
The text of document 17A/732/FDIS, future edition 1 of IEC 62271-107, prepared by SC 17A, High-
voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 62271-107 on 2005-10-01.
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) 2006-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-10-01
This European Standard should be read in conjunction with EN 60694:1996, to which it refers and
which is applicable, unless otherwise specified. In order to simplify the indication of corresponding
requirements, the same numbering of clauses and subclauses is used as in EN 60694. Additional
subclauses are numbered from 101.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62271-107:2005 was approved by CENELEC as a
European Standard without any modification.
__________
- 3 - EN 62271-107:2005
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
IEC 60050-441 - International Electrotechnical Vocabulary - -
(IEV)
Chapter 441: Switchgear, controlgear and
fuses
1)
2)
IEC 60265-1 - High-voltage switches EN 60265-1 1998
Part 1: Switches for rated voltages above
1 kV and less than 52 kV
IEC 60282-1 2002 High-voltage fuses EN 60282-1 2002
Part 1: Current-limiting fuses

1)
IEC 60466 - AC insulation-enclosed switchgear and - -
controlgear for rated voltages above 1 kV
and up to and including 38 kV
1) 2)
IEC 60694 - Common specifications for high-voltage EN 60694 1996
switchgear and controlgear standards + corr. May 1999

1)
IEC 60787 - Application guide for the selection of - -
fuse-links of high-voltage fuses for
transformer circuit applications

1) 2)
IEC 62271-100 - High-voltage switchgear and controlgear EN 62271-100 2001
Part 100: High-voltage alternating-current
circuit-breakers
1) 2)
IEC 62271-102 - Part 102: Alternating current EN 62271-102 2002
disconnectors and earthing switches

1) 2)
IEC 62271-105 - Part 105: Alternating current switch-fuse EN 62271-105 2003
combinations
1)
IEC 62271-200 - Part 200: AC metal-enclosed switchgear EN 62271-200 2004
and controlgear for rated voltages above
1 kV and up to and including 52 kV

1)
Undated reference.
2)
Valid edition at date of issue.

NORME CEI
INTERNATIONALE
IEC
62271-107
INTERNATIONAL
Première édition
STANDARD
First edition
2005-09
Appareillage à haute tension –
Partie 107:
Circuits-switchers fusiblés pour courant alternatif
de tension assignée supérieure à 1 kV et jusqu'à
52 kV inclus
High-voltage switchgear and controlgear –
Part 107:
Alternating current fused circuit-switchers
for rated voltages above 1 kV up to and
including 52 kV
 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

62271-107  IEC:2005 – 3 –
CONTENTS
FOREWORD.9
1 General .13
1.1 Scope.13
1.2 Normative references .13
2 Normal and special service conditions .15
3 Terms and definitions .15
3.1 General terms .15
3.2 Assemblies of switchgear and controlgear .15
3.3 Parts of assemblies .15
3.4 Switching devices.17
3.5 Parts of switchgear and controlgear .17
3.6 Operation .17
3.7 Characteristic quantities .17
4 Ratings.21
4.1 Rated voltage (U ).21
r
4.2 Rated insulation level .21
4.3 Rated frequency (f ) .21
r
4.4 Rated normal current and temperature rise.21
4.5 Rated short-time withstand current (I ).23
k
4.6 Rated peak withstand current (I ).23
p
4.7 Rated duration of short circuit (t ) .23
k
4.8 Rated supply voltage of closing and opening devices and of auxiliary and
control circuits (U ) .23
a
4.9 Rated supply frequency of closing and opening devices and of auxiliary circuits .23
4.10 Rated pressure of compressed gas supply for insulation and/or operation.23
5 Design and construction .25
5.1 Requirements for liquids in fused circuit-switchers .25
5.2 Requirements for gases in fused circuit-switchers .25
5.3 Earthing of fused circuit-switchers .25
5.4 Auxiliary and control equipment.25
5.5 Dependent power operation.27
5.6 Stored energy operation .27
5.7 Independent manual operation .27
5.8 Operation of releases .27
5.9 Low- and high- pressure interlocking and monitoring devices .27
5.10 Nameplates .27
5.11 Interlocking devices.29
5.12 Position indication .29
5.13 Degrees of protection by enclosures.29
5.14 Creepage distances.29
5.15 Gas and vacuum tightness .29
5.16 Liquid tightness .29
5.17 Flammability.29
5.18 Electromagnetic compatibility (EMC) .29

62271-107  IEC:2005 – 5 –
6 Type tests .31
6.1 General .31
6.2 Dielectric tests .33
6.3 Radio interference voltage (RIV) tests .33
6.4 Measurement of the resistance of circuits.33
6.5 Temperature-rise tests .33
6.6 Short-time withstand current and peak withstand current tests .35
6.7 Verification of the protection.35
6.8 Tightness tests .35
6.9 Electromagnetic compatibility tests (EMC).35
7 Routine tests .51
8 Guide for the selection of fused circuit-switchers .53
8.1 Objective.53
8.2 Short-circuit breaking current .53
8.3 Rated maximum thermal current.55
8.4 Currents between thermal current and I of the fuses .55
8.5 Transfer current .55
8.6 Take-over current.55
8.7 Extension of the validity of type tests .55
8.8 Operation .57
8.9 Comparison of performances of fused circuit-switchers with performances of
switch-fuse combinations and circuit-breakers.59
9 Information to be given with enquiries, tenders and orders .61
9.1 Information to be given with enquiries and orders.61
9.2 Information to be given with tenders .61
10 Rules for transport, storage, installation, operation and maintenance .61
11 Safety.61

Annex A (informative) Applicability of the rated take-over current test duty .73

Bibliography.89

Figure 1 – Representation of a specified TRV by a two-parameter reference line and a
delay line .63
Figure 2 – Example of a two-parameter reference line for a TRV .63
Figure 3 – Arrangement of test circuits for test duties TD , TD ,TD and TD .65
Ith Isc Ito Ilow
Figure 4 – Measurement of the power frequency recovery voltage with striker operation.67
Figure 5 – Characteristics for determining the take-over current .69
Figure A.1 – Visualization of the application margin for a given fuse .77

62271-107  IEC:2005 – 7 –
Table 1 – Nameplate markings.27
Table 2 – Comparison between switch-fuse combination and fused circuit-switcher .59
Table 3 – Comparison between fused circuit-switcher and circuit breaker .59
Table 4 – Summary of test parameters for test duties .71
Table A.1 – Minimum application margin according to fuse characteristic .83
Table A.2 – Minimum protection time delay.85
Table A.3 – Examples of possible need for time delay .87

62271-107  IEC:2005 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 107: Alternating current fused circuit-switchers
for rated voltages above 1 kV up to and including 52 kV

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 62271-107 has been prepared by subcommittee 17A: High voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
The text of this standard is based on the following documents:
FDIS Report on voting
17A/732/FDIS 17A/739/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

62271-107  IEC:2005 – 11 –
This standard should be read in conjunction with IEC 60694, second edition, published in
1996, to which it refers and which is applicable, unless otherwise specified. In order to
simplify the indication of corresponding requirements, the same numbering of clauses and
subclauses is used as in IEC 60694. Amendments to these clauses and subclauses are given
under the same numbering, whilst additional subclauses are numbered from 101.
The list of other parts of the IEC 62271 series can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
62271-107  IEC:2005 – 13 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 107: Alternating current fused circuit-switchers
for rated voltages above 1 kV up to and including 52 kV

1 General
1.1 Scope
This part of IEC 62271 applies to three-pole operated units for distribution systems that are
functional assemblies of a circuit-switcher and current-limiting fuses designed so as to be
capable of:
– breaking, at the rated recovery voltage, any load or fault current up to and including the
rated short-circuit breaking current;
– making, at the rated voltage, circuits to which the rated short-circuit breaking current
applies.
They are intended to be used for circuits or applications requiring only a normal mechanical
and electrical endurance capability. Such applications cover protection of HV/LV transformers
for instance, but exclude distribution lines or cables, as well as motor circuits and capacitor
bank circuits.
Short-circuit conditions with low currents, up to the fused circuit-switcher rated take-over
current, are dealt with by supplementary devices (strikers, relays, etc.), properly arranged,
tripping the circuit-switcher. Fuses are incorporated in order to ensure that the short-circuit
breaking capacity of the device is above that of the circuit-switcher.
NOTE 1 In this standard the term "fuse" is used to designate either the fuse or the fuse-link where the general
meaning of the text does not result in ambiguity.
This standard applies to fused circuit-switchers designed with rated voltages above 1 kV up to
and including 52 kV for use on three-phase alternating current systems of either 50 Hz or
60 Hz. Comparison with other existing switching devices is provided in Clause 8.
NOTE 2 Other circuit-switchers exist; see reference [1] of the bibliography.
Fuses are covered by IEC 60282-1.
Earthing switches forming an integral part of a circuit-switcher are covered by IEC 62271-102.
Installation in enclosure, if any, is covered either by IEC 62271-200 or by IEC 60466.
1.2 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.

62271-107  IEC:2005 – 15 –
IEC 60050(441), International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear,
controlgear and fuses
IEC 60265-1: High-voltage switches – Part 1: Switches for rated voltages above 1 kV and less
than 52 kV
IEC 60282-1: 2002, High-voltage fuses – Part 1: Current-limiting fuses
IEC 60466: A.C. insulation-enclosed switchgear and controlgear for rated voltages above 1 kV
and up to and including 38 kV
IEC 60694: Common specifications for high-voltage switchgear and controlgear standards
IEC 60787: Application guide for the selection of fuse-links of high-voltage fuses for
transformer circuit applications
IEC 62271-100: High-voltage switchgear and controlgear – Part 100: High-voltage alternating-
current circuit-breakers
IEC 62271-102: High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
IEC 62271-105: High-voltage switchgear and controlgear – Part 105: Alternating current
switch-fuse combinations
IEC 62271-200: High-voltage switchgear and controlgear – Part 200: A.C. metal-enclosed
switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
2 Normal and special service conditions
Clause 2 of IEC 60694 is applicable.
3 Terms and definitions
For the purposes of this document, the terms and definitions of IEC 60050(441) and
IEC 60694 apply. Some of them are recalled here for ease of reference.
The definitions given below are also applicable. Additional definitions are classified so as to
be aligned with the classification used in IEC 60050(441). The definitions of IEC 60050(441)
are not repeated but reference is made to their specific number.
3.1 General terms
None
3.2 Assemblies of switchgear and controlgear
None.
3.3 Parts of assemblies
None.
62271-107  IEC:2005 – 17 –
3.4 Switching devices
3.4.101
circuit-switcher
mechanical switching device suitable for making, carrying and interrupting currents under
normal circuit conditions. It is also suitable for interrupting specified fault currents that may be
less than its short-time withstand current.
NOTE Other circuit-switchers exist; see reference [1] of the bibliography.
3.4.102
fused circuit-switcher
device comprising a three-pole circuit-switcher and three current limiting fuses, capable of
making and breaking any load or fault current up to its short-circuit breaking current, under
TRV and power factor conditions defined in this standard
3.4.103
fused circuit-switcher base (or device base)
fused circuit-switcher without fuse-links mounted
3.4.104
non-sustained disruptive discharge (NSDD)
disruptive discharge associated with current interruption, that does not result in the
resumption of power frequency current or, in the case of capacitive current interruption does
not result in current at the natural frequency of the circuit
3.5 Parts of switchgear and controlgear
3.5.101
release
[IEV 441-15-17]
3.5.102
over-current release
[IEV 441-16-33]
3.5.103
shunt release
[IEV 441-16-41]
3.6 Operation
3.6.101
independent manual operation (of the fused circuit-switcher)
[IEV 441-16-16]
3.6.102
stored energy operation (of the fused circuit-switcher)
[IEV 441-16-15]
3.7 Characteristic quantities
3.7.101
prospective current (of a circuit and with respect to a switching device or a fuse)
[IEV 441-17-01]
62271-107  IEC:2005 – 19 –
3.7.102
prospective peak current
[IEV 441-17-02]
3.7.103
maximum prospective peak current
[IEV 441-17-04]
3.7.104
prospective breaking current
[IEV 441-17-06]
3.7.105
breaking current
[IEV 441-17-07]
3.7.106
minimum breaking current
[IEV 441-18-29]
3.7.107
short-circuit making capacity
[IEV 441-17-10]
3.7.108
take-over current
[IEV 441-17-16]
3.7.109
thermal current
I
th
maximum current carried continuously without the temperature rise of the various parts
exceeding the limits specified
3.7.110
fused short-circuit current
[IEV 441-17-21]
3.7.111
applied voltage
[IEV 441-17-24]
3.7.112
recovery voltage
[IEV 441-17-25]
3.7.113
transient recovery voltage (TRV)
[IEV 441-17-26]
3.7.114
power frequency recovery voltage
[IEV 441-17-27]
3.7.115
prospective transient recovery voltage
[IEV 441-17-29]
3.7.116
minimum opening time (of the fused circuit-switcher)
minimum interval of time between the initiation of the opening, from an external source, and
the first instant of the separation of the arcing contacts in any one pole

62271-107  IEC:2005 – 21 –
3.7.117
fuse-initiated opening time (of a fused circuit-switcher)
time taken from the instant at which arcing in the fuse commences to the instant when the
arcing contacts have separated in all poles. This definition applies only for fused circuit-
switchers fitted with fuse-striker release
3.101 Fuses
3.101.1
fuse-base, fuse mount
[IEV 441-18-02]
3.101.2
striker
[IEV 441-18-18]
3.101.3
cut-off current
[IEV 441-17-12]
3.101.4
I²t – Joule integral
[IEV 441-18-23]
4 Ratings
Clause 4 of IEC 60694 is applicable with the additions and exceptions indicated below.
In addition to the ratings listed in IEC 60694 the following ratings apply:
a) rated short-circuit breaking current;
b) rated transient recovery voltage;
c) rated short-circuit making current;
d) rated take-over current;
e) rated maximal thermal current.
4.1 Rated voltage (U )
r
IEC 60694, 4.1 is applicable.
4.2 Rated insulation level
IEC 60694, 4.2 is applicable.
4.3 Rated frequency (f )
r
IEC 60694, 4.3 is applicable.
4.4 Rated normal current and temperature rise
4.4.1 Rated normal current (I )
r
IEC 60694, 4.4.1 does not apply.

62271-107  IEC:2005 – 23 –
A rated normal current is normally not assigned to the fused circuit-switcher. When fused
circuit-switchers are combined into larger enclosed assemblies, the rated normal current of
the connecting busbars shall be in accordance with IEC 62271-200 or IEC 60466.
See also thermal current (4.4.101).
4.4.2 Temperature rise
IEC 60694, 4.4.2 is applicable and, as far as fuses are concerned, Clause 6 of IEC 60282-1.
4.4.101 Rated maximum thermal current (I )
th
The rated maximum thermal current is the maximum value of the thermal current for the fused
circuit-switcher.
It is not required that the thermal current is selected from the R10 series.
NOTE The actual thermal current depends on the fuses installed.
4.5 Rated short-time withstand current (I )
k
IEC 60694, 4.5 is not applicable.
4.6 Rated peak withstand current (I )
p
IEC 60694, 4.6 is not applicable.
4.7 Rated duration of short circuit (t )
k
IEC 60694, 4.7 is not applicable.
4.8 Rated supply voltage of closing and opening devices and of auxiliary
and control circuits (U )
a
IEC 60694, 4.8 is applicable.
4.9 Rated supply frequency of closing and opening devices and of auxiliary circuits
IEC 60694, 4.9 is applicable.
4.10 Rated pressure of compressed gas supply for insulation and/or operation
IEC 60694, 4.10 is applicable.
4.101 Rated short-circuit breaking current
The rated short-circuit breaking current is the highest prospective short-circuit current which
the fused circuit-switcher shall be capable of breaking under the conditions of use and
behaviour prescribed in this standard in a circuit having a power-frequency recovery voltage
corresponding to the rated voltage of the fused circuit-switcher and having a prospective
transient recovery voltage equal to the rated value specified in 4.102.
The rated short-circuit breaking current is expressed by the r.m.s. value of its a.c. component.

62271-107  IEC:2005 – 25 –
The rated short-circuit breaking currents shall be selected from the R10 series as follows:
8 – 10 – 12,5 – 16 – 20 – 25 – 31,5 – 40 – 50 – 63 – 80 – 100 kA
NOTE It is recognized that the series impedance of the fused circuit-switcher or rapid operation of the fuse or
fused circuit-switcher may cause one or both of the following effects:
a) a reduction of short-circuit current to a value appreciably below that which would otherwise be reached.
b) such rapid operation that the short-circuit current wave is distorted from its normal form.
This is why the term "prospective current" is used when assessing breaking and making performances.
4.102 Rated transient recovery voltage
The rated transient recovery voltage related to the rated short-circuit breaking current (in
accordance with 4.101) is the reference voltage which constitutes the upper limit of the
prospective transient recovery voltage of circuits which the fused circuit-switcher shall be
capable of breaking in the event of a short circuit.
4.103 Rated short-circuit making current
The rated short-circuit making current is the highest prospective peak current which the fused
circuit-switcher shall be capable of making under the conditions of use and behaviour defined
in this standard in a circuit having a power-frequency voltage corresponding to the rated
voltage of the fused circuit-switcher. It shall be 2,5 times (50 Hz) or 2,6 (60 Hz) the value of
the rated short-circuit breaking current.
NOTE See also note in 4.101.
4.104 Rated take-over current
The rated take-over current is the maximum r.m.s. value of the take-over current which the
circuit-switcher in the fused circuit-switcher is able to interrupt under the conditions of use
and behaviour prescribed in this standard in a circuit having a power-frequency recovery
voltage corresponding to the rated voltage of the fused circuit-switcher and having a
prospective transient recovery voltage equal to the value specified.
The rated value declared by the manufacturer shall be higher than the value of the take-over
current, determined according to Figure 5, given by the fuses used to demonstrate the rated
maximum thermal current.
5 Design and construction
5.1 Requirements for liquids in fused circuit-switchers
IEC 60694, 5.1 is applicable.
5.2 Requirements for gases in fused circuit-switchers
IEC 60694, 5.2 is applicable.
5.3 Earthing of fused circuit-switchers
IEC 60694, 5.3 is applicable.
5.4 Auxiliary and control equipment
IEC 60694, 5.4 is applicable.
62271-107  IEC:2005 – 27 –
5.5 Dependent power operation
IEC 60694, 5.5 is applicable with the following addition:
Dependent manual operation is not allowed.
5.6 Stored energy operation
IEC 60694, 5.6 is applicable.
5.7 Independent manual operation
IEC 60694, 5.7 is not applicable.
5.8 Operation of releases
IEC 60694, 5.8 is applicable.
5.9 Low- and high- pressure interlocking and monitoring devices
IEC 60694, 5.9 is applicable.
5.10 Nameplates
The table in IEC 60694, 5.10 is replaced by the table provided in this standard.
The nameplate of a fused circuit-switcher shall contain information according to Table1.
Table 1 – Nameplate markings
Abbreviation Unit Fused Operating Condition for marking
circuit- device required
switcher
(1) (2) (3) (4) (5) (6)
Manufacturer  X Y Only if not integral with the
device and/or manufacturers
are different
Type designation  X Y Only if not integral with the
device and/or manufacturers
are different
Instruction manual reference  X
Serial number  X (Y) Required for operating device
if different from those of the
circuit-switcher
Year of manufacture  X
Number of this standard  X
Rated voltage U kV X
r
U kV X
Rated lightning impulse p
withstand voltage
Rated frequency f Hz X
r
Rated maximum thermal A X
I
th
current
Acceptable fuse-links and  X Mandatory marking: "Fuse-
thermal current with fuses links: see instruction manual"

62271-107  IEC:2005 – 29 –
Table 1 (continued)
Abbreviation Unit Fused Operating Condition for marking
circuit- device required
switcher
(1) (2) (3) (4) (5) (6)
Rated gas pressure for P MPa Y When applicable
op
operation
U V Y When applicable
Rated supply voltage of a
auxiliary circuits
Temperature class  Y Different from
–5 °C indoor
–25 °C outdoor
X: The marking of these values is mandatory; blank spaces indicate zero values.
Y: The marking of these values is mandatory, subject to the conditions in column (6).
(Y): The marking of these values is optional and subject to the conditions in column (6).
NOTE The abbreviations in column (2) may be used instead of the terms in column (1). When the terms in column (1)
are used, the word "rated" need not appear.

5.11 Interlocking devices
IEC 60694, 5.11 is applicable.
5.12 Position indication
IEC 60694, 5.12 is applicable.
5.13 Degrees of protection by enclosures
IEC 60694, 5.13 is applicable.
5.14 Creepage distances
IEC 60694, 5.14 is applicable.
5.15 Gas and vacuum tightness
IEC 60694, 5.15 is applicable.
5.16 Liquid tightness
IEC 60694, 5.16 is applicable.
5.17 Flammability
IEC 60694, 5.17 is applicable.
5.18 Electromagnetic compatibility (EMC)
IEC 60694, 5.18 is applicable.

62271-107  IEC:2005 – 31 –
5.101 Linkages between the fuse striker(s) and the circuit-switcher release
The linkages between the fuse striker(s), if any, and the circuit-switcher release shall be such
that the circuit-switcher operates satisfactorily under both three-phase and single-phase fault
conditions at the minimum and maximum requirements of a given type of striker (medium or
heavy) irrespective of the method of striker operation (spring or explosive). The requirements
for strikers are given in IEC 60282-1.
5.102 Low over-current conditions (long fuse pre-arcing time conditions)
Fused circuit-switcher equipped with fuse striker release shall be designed so that they will
perform satisfactorily under any striker operation occurrence. The manufacturer shall state
how this requirement is fulfilled.
This is achieved by compliance with the following:
a) Time coordination between circuit-switcher and fuse is provided by either 1), 2), or 3)
below:
1) The fuse-initiated opening time of the circuit-switcher shall be shorter than the
maximum arcing time that the fuse can withstand. This arcing time value is at least
0,1s according to IEC 60282-1.
NOTE Tests have been introduced in IEC 60282-1 in order to asses that the maximum arcing withstand
time under long pre-arcing conditions is at least 100 ms.
2) Where the fuse manufacturer can show that the fuse has been satisfactorily proven at
all values of breaking current from the rated value down to the value equivalent to the
minimum melting current of the fuse in the fused circuit-switcher (i.e. full range fuses)
then the fuse-initiated opening time of the fused circuit-switcher is deemed not
relevant.
3) Where it can be shown that the thermal release of the fuse striker makes the circuit-
switcher clear the current before arcing in the fuse can occur, for all currents below I
(minimum breaking current of the fuse according to IEC 60282-1).
b) Temperature rise under these conditions does not impair the performances of the fused
circuit-switcher as proven by the test described in IEC 62271-105, 6.104.
6 Type tests
Clause 6 of IEC 60694 is applicable with the additions and the exceptions indicated below.
6.1 General
The purpose of type tests is to prove the characteristics of fused circuit-switchers, their
operating devices and their operating equipment.
Fuses shall be in accordance with IEC 60282-1. Relevant tests are out of the scope of this
standard.
Type tests include:
– dielectric tests;
– temperature rise tests;
– measurement of the resistance of the main circuit;

62271-107  IEC:2005 – 33 –
– tests to prove the ability of the fused circuit-switcher to make and break the specified
currents;
– tests to prove the satisfactory mechanical operation and endurance;
– verification of the protection;
– tightness tests;
– electromagnetic compatibility tests.
The fused circuit-switcher submitted for test shall be in new condition with clean contact parts
and fitted with the appropriate fuses.
6.1.1 Grouping of tests
IEC 60694, 6.1.1 is applicable.
6.1.2 Information for identification of specimens
IEC 60694, 6.1.2 is applicable.
6.1.3 Information to be included in type-test reports
IEC 60694, 6.1.3 is applicable.
6.2 Dielectric tests
IEC 60694, 6.2 is applicable with the following addition:
NOTE Care should be taken when choosing the fuse link, as the dimensions of the fuse link may affect the
dielectric properties.
Partial discharge tests as specified in IEC 60694, 6.2.9 are not required.
6.3 Radio interference voltage (RIV) tests
IEC 60694, 6.3 is not applicable.
6.4 Measurement of the resistance of circuits
IEC 60694, 6.4 is applicable with the following addition:
Solid links of negligible resistance shall be used instead of fuses and the resistance of the
links shall be recorded.
6.5 Temperature-rise tests
IEC 60694, 6.5 is applicable with the following addition:
The test shall be performed at the rated maximum thermal current, as determined by the
manufacturer.
Fuses for the test (referred to as X) shall be determined by the manufacturer and recorded in
the test report.
62271-107  IEC:2005 – 35 –
The compliance with temperature rise tests of the fused circuit-switcher made of the fused
circuit-switcher base and the proposed fuse type (referred to as X) demonstrates the
compliance of any fused circuit-switcher made of the same fused circuit-switcher base fitted
with other fuse type, at the associated thermal current of this new fused circuit-switcher
(I ), provided that the four criteria below are fulfilled:
th fused circuit-switcher
– the fuses have the same length as the fuse X;
– the fuses have rated current lower than, or equal to, those of the fuses X;
– the fuses have a rated dissipated power (according to the IEC 60282-1) lower than, or
equal to those of the fuses X;
– the de-rating of the fuses within the fused circuit-switcher ( I /I ) is
th fused circuit-switcher r fuse
lower than, or equal to those of the fuses X.
As compliance with the above criteria already includes safety margins, the diameter of the
fuses needs not to be considered.
NOTE The dielectric properties may be affected when using other diameters than that of fuse X.
On request of the manufacturer, other temperature rise tests may be performed, with different
fuse types providing other thermal current values lower than the rated maximum thermal
current, in order to provide further possibilities in the fuse selection criteria.
6.6 Short-time withstand current and peak withstand current tests
IEC 60694, 6.6 is not applicable.
6.7 Verification of the protection
IEC 60694, 6.7 is applicable.
6.8 Tightness tests
IEC 60694, 6.8 is applicable.
6.9 Electromagnetic compatibility tests (EMC)
IEC 60694, 6.9 is applicable.
6.101 Making and breaking tests
This tests contains four duties:
– TD : making and breaking tests at the rated maximum thermal current;
Ith
– TD : making and breaking tests at the rated short-circuit current;
Isc
– TD : breaking test at the rated take-over current;
Ito
– TD : breaking test at one third of the rated take-over current.
Ilow
6.101.1 Conditions for performing the tests
In principle, the tests detailed in 6.101 (making and breaking tests) verify only the
performance of the particular fused cir
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