SIST-TP CLC/TR 60269-5:2011

Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses (IEC/TR 60269-5:2010)

This technical report, which serves as an application guide for low-voltage fuses, shows how current-limiting fuses are easy to apply to protect today's complex and sensitive electrical and electronic equipment. This guidance specifically covers low-voltage fuses up to 1000 V a.c. and 1500 V d.c. designed and manufactured in accordance with IEC 60269 series. This guidance provides important facts about as well as information on the application of fuses.

Niederspannungssicherungen - Teil 5: Leitfaden für die Anwendung von Niederspannungssicherungen (IEC/TR 60269-5:2010)

Fusibles basse tension - Partie 5: Lignes directrices pour l'application des fusibles basse tension (CEI/TR 60269-5:2010)

Nizkonapetostne varovalke - 5. del: Navodila za uporabo nizkonapetostnih varovalk (IEC/TR 60269-5:2010)

To tehnično poročilo, ki se uporablja kot vodilo za uporabo nizkonapetostnih varovalk, kaže, kako so tokovno omejilne varovalke preproste za uporabo za varovanje današnje kompleksne in občutljive električne in elektronske opreme. Ta navodila izrecno zajemajo nizkonapetostne varovalke do 1000 V izmeničnega toka in 1500 enosmernega toka, načrtovane in proizvedene v skladu s serijo IEC 60269. Ta navodila zagotavljajo pomembna dejstva in tudi informacije o uporabi varovalk.

General Information

• Status: Withdrawn
• Publication Date: 22-May-2011
• Withdrawal Date: 14-Mar-2022
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: EVA - Fuses
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 03-Mar-2022
• Due Date: 26-Mar-2022
• Completion Date: 15-Mar-2022
• Ref Project: CLC/TR 60269-5:2011 - Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TP CLC/TR 60269-5:2011
01-julij-2011
Nizkonapetostne varovalke - 5. del: Navodila za uporabo nizkonapetostnih
varovalk (IEC/TR 60269-5:2010)
Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses (IEC/TR
60269-5:2010)
Niederspannungssicherungen - Teil 5: Leitfaden für die Anwendung von
Niederspannungssicherungen (IEC/TR 60269-5:2010)
Fusibles basse tension - Partie 5: Lignes directrices pour l'application des fusibles basse
tension (CEI/TR 60269-5:2010)
Ta slovenski standard je istoveten z: CLC/TR 60269-5:2011
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
SIST-TP CLC/TR 60269-5:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST-TP CLC/TR 60269-5:2011

---------------------- Page: 2 ----------------------

SIST-TP CLC/TR 60269-5:2011

TECHNICAL REPORT
CLC/TR 60269-5

RAPPORT TECHNIQUE
April 2011
TECHNISCHER BERICHT

ICS 29.120.50


English version


Low-voltage fuses -
Part 5: Guidance for the application of low-voltage fuses
(IEC/TR 60269-5:2010)


Fusibles basse tension -  Niederspannungssicherungen -
Partie 5: Lignes directrices pour Teil 5: Leitfaden für die Anwendung von
l'application des fusibles basse tension Niederspannungssicherungen
(CEI/TR 60269-5:2010) (IEC/TR 60269-5:2010)






This Technical Report was approved by CENELEC on 2011-04-25.

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. CLC/TR 60269-5:2011 E

---------------------- Page: 3 ----------------------

SIST-TP CLC/TR 60269-5:2011
CLC/TR 60269-5:2011 - 2 -
Foreword
This Technical Report consists of the text of the International Technical Report IEC/TR 60269-5:2010
prepared by SC 32B, Low-voltage fuses, of IEC TC 32, Fuses.
It was circulated for voting in accordance with the Internal Regulations, Part 2, Subclause 11.4.3.3
(simple majority) and was accepted by CENELEC as CLC/TR 60269-5 on 2011-04-25.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the Technical Report IEC/TR 60269-5:2010 was approved by CENELEC as a Technical
Report without any modification.
__________

---------------------- Page: 4 ----------------------

SIST-TP CLC/TR 60269-5:2011
- 3 - CLC/TR 60269-5:2011
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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60050-441 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 441: Switchgear, controlgear and
fuses


IEC/TR 60146-6 - Semiconductor convertors - - -
Part 6: Application guide for the protection of
semiconductor convertors against overcurrent
by fuses


IEC 60269 Series Low-voltage fuses EN 60269 Series


IEC 60269-1 - Low-voltage fuses - EN 60269-1 -
Part 1: General requirements


IEC 60269-2 - Low-voltage fuses - HD 60269-2 -
Part 2: Supplementary requirements for fuses
for use by authorized persons (fuses mainly
for industrial application) - Examples of
standardized systems of fuses A to J


IEC 60269-3 (mod) - Low-voltage fuses - HD 60269-3 -
Part 3: Supplementary requirements for fuses
for use by unskilled persons (fuses mainly for
household or similar applications) - Examples
of standardized systems of fuses A to F


IEC 60269-4 - Low-voltage fuses - EN 60269-4 -
Part 4: Supplementary requirements for fuse-
links for the protection of semiconductor
devices


IEC 60364-4-41 - Low-voltage electrical installations - HD 60364-4-41 -
(mod) Part 4-41: Protection for safety - Protection
against electric shock


IEC 60364-4-43 - Low voltage electrical installations - HD 60364-4-43 -
(mod) Part 4-43: Protection for safety - Protection
against overcurrent


IEC 60364-5-52 - Low-voltage electrical installations - HD 60364-5-52 -
(mod) Part 5-52: Selection and erection of electrical
equipment - Wiring systems


IEC/TR 60787 - Application guide for the selection of high-- -
voltage current-limiting fuse-links for
transformer circuits


IEC 60947 Series Low-voltage switchgear and controlgear EN 60947 Series


IEC 60947-3 - Low-voltage switchgear and controlgear - EN 60947-3 -
Part 3: Switches, disconnectors, switch-
disconnectors and fuse-combination units

---------------------- Page: 5 ----------------------

SIST-TP CLC/TR 60269-5:2011
CLC/TR 60269-5:2011 - 4 -
Publication Year Title EN/HD Year

IEC 60947-4-1 - Low-voltage switchgear and controlgear - EN 60947-4-1 -
Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-
starters


IEC/TR 61912-1 - Low-voltage switchgear and controlgear - - -
Overcurrent protective devices -
Part 1: Application of short-circuit ratings

---------------------- Page: 6 ----------------------

SIST-TP CLC/TR 60269-5:2011

IEC/TR 60269-5
®
Edition 1.0 2010-09
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
Low-voltage fuses –
Part 5: Guidance for the application of low-voltage fuses

Fusibles basse tension –
Partie 5: Lignes directrices pour l’application des fusibles basse tension

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 29.120.50 ISBN 978-2-88912-175-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------

SIST-TP CLC/TR 60269-5:2011
– 2 – TR 60269-5 © IEC:2010
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
2 Normative references .8
3 Terms and definitions .9
4 Fuse benefits.10
5 Fuse construction and operation.11
5.1 Components .11
5.2 Fuse-construction.11
5.2.1 Fuse link.11
5.2.2 Fuse-link contacts .13
5.2.3 Indicating device and striker .13
5.2.4 Fuse-base .13
5.2.5 Replacement handles and fuse-holders .13
5.3 Fuse operation .14
5.3.1 General .14
5.3.2 Fuse operation in case of short-circuit .14
5.3.3 Fuse operation in case of overload .14
6 Fuse-combination units .15
7 Fuse selection and markings .16
8 Conductor protection .18
8.1 General .18
8.2 Type gG .18
8.3 Types gN and gD .19
8.4 Types gR and gS.19
8.5 Protection against short-circuit current only.19
9 Selectivity of protective devices.20
9.1 General .20
9.2 Selectivity between fuses .21
9.2.1 Verification of selectivity for operating time ≥ 0,1 s .21
9.2.2 Verification of selectivity for operating time < 0,1 s .22
9.2.3 Verification of total selectivity .22
9.3 Selectivity of circuit-breakers upstream of fuses .22
9.3.1 General .22
9.3.2 Verification of selectivity for operating time ≥ 0,1 s .22
9.3.3 Verification of selectivity for operating time < 0,1 s .23
9.3.4 Verification of total selectivity .23
9.4 Selectivity of fuses upstream of circuit-breakers .23
9.4.1 General .23
9.4.2 Verification of selectivity for operating time ≥ 0,1 s .23
9.4.3 Verification of selectivity for operating time < 0,1 s .23
9.4.4 Verification of total selectivity .23
10 Short-circuit damage protection .25
10.1 General .25
10.2 Short-circuit current paths .25

---------------------- Page: 8 ----------------------

SIST-TP CLC/TR 60269-5:2011
TR 60269-5 © IEC:2010 – 3 –
10.3 Current limitation.26
10.4 Rated conditional short-circuit current, rated breaking capacity .26
11 Protection of power factor correction capacitors .26
12 Transformer protection .27
12.1 Distribution transformers with a high-voltage primary .27
12.2 Distribution transformers with a low-voltage primary.28
12.3 Control circuit transformers .28
13 Motor circuit protection .28
13.1 General .28
13.2 Fuse and motor-starter coordination .29
13.3 Criteria for coordination at the rated conditional short-circuit current I .29
q
13.4 Criteria for coordination at the crossover current I .30
co
13.5 Criteria for coordination at test current “r”.31
14 Circuit-breaker protection .31
15 Protection of semiconductor devices .31
16 Fuses in enclosures.32
16.1 Limiting temperature of type gG fuse-links according to IEC 60269-2 –
System A.32
16.2 Other fuse-links.33
17 DC applications .33
17.1 Short-circuit protection .33
17.2 Overload protection .33
17.3 Time-current characteristics .34
18 Automatic disconnection for protection against electric shock for installations in
buildings.35
18.1 General .35
18.2 Principle of the protection.35
18.3 Examples .37
Annex A (informative) Coordination between fuses and contactors/motor-starters.38
Bibliography.48

Figure 1 – Typical fuse-link according to IEC 60269-2 .12
Figure 2 – Typical fuse-link according to IEC 60269-2 .13
Figure 3 – Current-limiting fuse operation .14
Figure 4 – Fuse operation on overload.15
Figure 5 – Selectivity – General network diagram .20
Figure 6 – Verification of selectivity between fuses F and F for operating time t ≥ 0,1 s .21
2 4
Figure 7 – Verification of selectivity between circuit-breaker C and fuses F and F .22
2 5 6
Figure 8 – Verification of selectivity between fuse F and circuit-breaker C for
2 3
operating time t ≥ 0,1 s .24
Figure 9 – Verification of selectivity between fuse F and circuit-breaker C for
2 3
operating time t < 0,1 s .25
Figure 10 – Fuse and motor-starter coordination.30
Figure 11 – DC circuit .33
Figure 12 – DC breaking operation .34
Figure 13 – Fuse operating time at various d.c. circuit time constants.35

---------------------- Page: 9 ----------------------

SIST-TP CLC/TR 60269-5:2011
– 4 – TR 60269-5 © IEC:2010
Figure 14 – Time-current characteristic.36
Figure A.1 – Collation of cut-off currents observed in successful coordination at I .39
q
2
Figure A.2 – Pre-arcing and operating I t values of fuses used in successful
coordination tests as a function of contactor rated current AC3.40
2
Figure A.3 – Pre-arcing and operating I t values of fuses used in successful
coordination tests as a function of fuse rated current I .41
n
Figure A.4 – Illustration of the method of selection of the maximum rated current of a
fuse for back-up protection of a contactor of rating I = X amperes .45
e
Figure A.5 – Withstand capabilities of a range of contactors and associated overload
relays at test current "r" .46
Figure A.6 – Illustration of a method of deriving curves of maximum peak current at
test current "r" as a function of fuse rated current (these derived curves can be used in
the same way as illustrated in Figure A.4).47

Table 1 – Definitions and symbols of switches and fuse-combination units.16
Table 2 – Fuse application.17
Table 3 – Maximum operational voltage of fuse-links .18
Table 4 – Fuse selection for power factor correction capacitors (fuses according to
IEC 60269-2, system A) .27
Table 5 – Time constants of typical d.c. circuits .34
Table A.1 – Examples of typical fuse-link ratings used for motor-starter protection
illustrating how the category of fuse-link can influence the optimum current rating .38
Table A.2 (Table 12 of IEC 60947-4-1) – Value of the prospective test current
according to the rated operational current.43
Table A.3 – Types of coordination.44

---------------------- Page: 10 ----------------------

SIST-TP CLC/TR 60269-5:2011
TR 60269-5 © IEC:2010 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

LOW-VOLTAGE FUSES –

Part 5: Guidance for the application of low-voltage fuses


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.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 60269-5, which is a technical report, has been prepared by subcommittee 32B: Low-
voltage fuses, of IEC technical committee 32: Fuses.
This technical report cancels and replaces IEC/TR 61818, published in 2003, and IEC/TR
61459, published in 1996. It constitutes a minor revision by amending and restructuring the
two replaced publications.

---------------------- Page: 11 ----------------------

SIST-TP CLC/TR 60269-5:2011
– 6 – TR 60269-5 © IEC:2010
The text of this technical report is based on the following documents:

Enquiry draft Report on voting
32B/554/DTR 32B/566/RVC

Full information on the voting for the approval of this technical report 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.
A list of all parts of the IEC 60269 series, under the general title: Low-voltage fuses, can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.

---------------------- Page: 12 ----------------------

SIST-TP CLC/TR 60269-5:2011
TR 60269-5 © IEC:2010 – 7 –
INTRODUCTION
Fuses protect many types of equipment and switchgear against the effects of over-current
which can be dramatic:
• thermal damage of conductors or bus-bars;
• vaporisation of metal;
• ionisation of gases;
• arcing, fire, explosion,
• insulation damage.
Apart from being hazardous to personnel, significant economic losses can result from
downtime and the repairs required to restore damaged equipment.
Modern fuses are common overcurrent protective devices in use today, and as such provide
an excellent cost effective solution to eliminate or minimize the effects of overcurrent.

---------------------- Page: 13 ----------------------

SIST-TP CLC/TR 60269-5:2011
– 8 – TR 60269-5 © IEC:2010
LOW-VOLTAGE FUSES –

Part 5: Guidance for the application of low-voltage fuses



1 Scope
This technical report, which serves as an application guide for low-voltage fuses, shows how
current-limiting fuses are easy to apply to protect today's complex and sensitive electrical and
electronic equipment. This guidance specifically covers low-voltage fuses up to 1 000 V a.c.
and 1 500 V d.c. designed and manufactured in accordance with IEC 60269 series. This
guidance provides important facts about as well as information on the application of fuses.
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.
IEC 60050-441, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear,
controlgear and fuses
IEC/TR 60146-6, Semiconductor convertors – Part 6: Application guide for the protection of
semiconductor convertors against overcurrent by fuses
IEC 60269 (all parts), Low-voltage fuses
IEC 60269-1, Low-voltage fuses – Part 1: General requirements
IEC 60269-2, Low-voltage fuses – Part 2: Supplementary requirements for fuses for use by
authorized persons (fuses mainly for industrial application) – Examples of standardized fuses
system A to J
IEC 60269-3, Low-voltage fuses – Part 3: Supplementary requirements for fuses for use by
unskilled persons – Examples of standardized fuses system A to F
IEC 60269-4, Low-voltage fuses – Part 4: Supplementary requirements for fuse-links for the
protection of semiconductor devices
IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-43, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60364-5-52, Low-voltage electrical installations – Part 5-52: Selection and erection of
electrical equipment – Wiring systems
IEC/TR 60787, Application guide for the selection of high-voltage current-limiting fuse-links
for transformer circuits
IEC 60947 (all parts), Low-voltage switchgear and controlgear

---------------------- Page: 14 ----------------------

SIST-TP CLC/TR 60269-5:2011
TR 60269-5 © IEC:2010 – 9 –
IEC 60947-3, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 60947-4-1, Low-voltage switchgear and controlgear – Part 4-1: Contactors and motor-
starters – Electromechanical contactors and motor-starters
CEI 61912-1 : Low-voltage switchgear and controlgear – Overcurrent protective devices –
Part 1 :Application of short-circuit ratings
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
switch (mechanical)
mechanical switching device capable of making, carrying and breaking currents under normal
circuit conditions, which may include specified operating overload conditions and also
carrying, for a specified time, currents under specified abnormal conditions such as those of
short-circuits
NOTE A switch may be capable of making but not breaking, short-circuit currents.
[IEC,60050-441:1984, 441-14-10]
3.2
disconnector
mechanical switching device that, in the
...