SIST-TP IEC 60269-5 TRTR Ed. 1.0:2022

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

IEC/TR 60269-5:2010 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.

Fusibles basse tension - Partie 5: Lignes directrices pour l'application des fusibles basse tension

La CEI/TR 60269-5:2010 est un guide d'application des fusibles basse tension, montre que les fusibles limiteurs de courant sont faciles à utiliser pour protéger le matériel électronique complexe et sensible d'aujourd'hui. Ces lignes directrices couvrent spécifiquement les fusibles basse tension de tensions jusqu'à 1 000 V en courant alternatif et 1 500 V en courant continu selon la série CEI 60269. Elles fournissent des informations sur les fusibles ainsi que sur leurs applications.

[Not translated]

General Information

• Status: Not Published
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: EVA - Fuses
• Ref Project: IEC TR 60269-5:2010 - Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses

Relations

• Revised: SIST-TP IEC TR 60269-5:2022 - Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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

IEC/TR 60269-5:2010

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

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– 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

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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

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– 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

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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,
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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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.

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– 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.

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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.

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– 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

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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 open position, complies with the requirements
specified for isolating function
NOTE Some disconnectors may not be capable of switching load.
[IEC 60050-441:1984, 441-14-05, modified]
3.3
fuse-combination unit
combination of a mechanical switching device and one or more fuses in a composite unit,
assembled by the manufacturer or in accordance with his instructions
[IEC 60050-441:1984, 441-14-04, modified]
3.4
switch-fuse
switch in which one or more poles have a fuse in series in a composite unit
[IEC 60050-441:1984, 441-14-14]
3.5
fuse-switch
switch in which a fuse-link or a fuse-carrier with fuse-link forms the moving contact
[IEC 60050-441:1984, 441-14-17]
3.6
Switching device
SD
device designed to make or break the current in one or more electric circuits
NOTE A switching device may perform one or both of these operations.
[IEC 60050-441:1984, 441-14-01]

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– 10 – TR 60269-5 © IEC:2010
3.7
short-circuit protective device
SCPD
device intended to protect a circuit or parts of a circuit against short-circuits by interrupting
them
3.8
overload protection
protection intended to operate in the event of overload on the protected section
[IEC 60050-448:1995, 448-14-31]
3.9
overload
operating conditions in an electrically undamaged circuit, which cause an over-current
[IEC 60050-441:1984, 441-11-08]
3.10
overcurrent
current exceeding the rated current
[IEC 60050-442:1998, 442-01-20]
3.11
rated conditional short-circuit current (of a switching device)
I
q
prospective current that a switching device, protected by a short-circuit protective device, can
satisfactorily withstand for the operatin
...