SIST EN 60269-4:2010
(Main)Low-voltage fuses - Part 4: Supplementary requirements for fuse-links for the protection of semiconductor devices (IEC 60269-4:2009)
Low-voltage fuses - Part 4: Supplementary requirements for fuse-links for the protection of semiconductor devices (IEC 60269-4:2009)
These supplementary requirements apply to fuse-links for application in equipment containing semiconductor devices for circuits of nominal voltages up to 1 000 V a.c. or 1 500 V d.c. and also, in so far as they are applicable, for circuits of higher nominal voltages.
Niederspannungssicherungen - Teil 4: Zusätzliche Anforderungen an Sicherungseinsätze zum Schutz von Halbleiter-Bauelementen (IEC 60269-4:2009)
Fusibles basse tension - Partie 4: Exigences supplémentaires concernant les éléments de remplacement utilisés pour la protection des dispositifs à semiconducteurs (CEI 60269-4:2009)
La CEI 60269-4:2009 doit être utilisée conjointement avec la quatrième édition de la CEI 60269-1. Cette Partie 4 complète ou modifie les articles ou paragraphes correspondant de la Partie 1. Sauf indication contraire dans le texte qui suit, les éléments de remplacement utilisés pour la protection des dispositifs à semiconducteurs doivent répondre à l'ensemble des exigences énoncées dans la CEI 60269-1 ainsi qu'aux exigences supplémentaires fixées ci-après. Cette cinquième édition annule et remplace la quatrième édition, parue en 2006. Elle constitue une révision technique. Les modifications techniques significatives par rapport à la quatrième édition sont: - l'introduction des éléments de remplacement pour onduleur à source de tension, y compris les exigences d'essai; - les essais sur les caractéristiques de fonctionnement en courant alternatif, maintenant couverts par les essais de pouvoir de coupure; - la mise à jour des exemples d'éléments de remplacement normalisés pour la protection des dispositifs à semiconducteurs.
Nizkonapetostne varovalke - 4. del: Dodatne zahteve za taljive vložke za zaščito polprevodniških naprav (IEC 60269-4:2009)
Te dodatne zahteve veljajo za taljive vložke za uporabo v opremi, ki vsebuje polprevodniške naprave za tokokroge nazivnih napetosti do 1000 V izmenične ali 1500 V enosmerne ter tudi za tokokroge višjih nazivnih napetosti, kolikor so te ustrezne.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60269-4:2010
01-januar-2010
1DGRPHãþD
SIST EN 60269-4:2007
1L]NRQDSHWRVWQHYDURYDONHGHO 'RGDWQH]DKWHYH]DWDOMLYHYORåNH]D]DãþLWR
SROSUHYRGQLãNLKQDSUDY ,(&
Low-voltage fuses - Part 4: Supplementary requirements for fuse-links for the protection
of semiconductor devices (IEC 60269-4:2009)
Niederspannungssicherungen - Teil 4: Zusätzliche Anforderungen an
Sicherungseinsätze zum Schutz von Halbleiter-Bauelementen (IEC 60269-4:2009)
Fusibles basse tension - Partie 4: Exigences supplémentaires concernant les éléments
de remplacement utilisés pour la protection des dispositifs à semiconducteurs (CEI
60269-4:2009)
Ta slovenski standard je istoveten z: EN 60269-4:2009
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
SIST EN 60269-4:2010 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60269-4:2010
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SIST EN 60269-4:2010
EUROPEAN STANDARD
EN 60269-4
NORME EUROPÉENNE
November 2009
EUROPÄISCHE NORM
ICS 29.120.50 Supersedes EN 60269-4:2007
English version
Low-voltage fuses -
Part 4: Supplementary requirements for fuse-links
for the protection of semiconductor devices
(IEC 60269-4:2009)
Fusibles basse tension - Niederspannungssicherungen -
Partie 4: Exigences supplémentaires Teil 4: Zusätzliche Anforderungen
concernant les éléments de remplacement an Sicherungseinsätze zum Schutz
utilisés pour la protection des dispositifs von Halbleiter-Bauelementen
à semiconducteurs (IEC 60269-4:2009)
(CEI 60269-4:2009)
This European Standard was approved by CENELEC on 2009-09-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, 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
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60269-4:2009 E
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SIST EN 60269-4:2010
EN 60269-4:2009 - 2 -
Foreword
The text of document 32B/535/FDIS, future edition 5 of IEC 60269-4, prepared by SC 32B, Low-voltage
fuses, of IEC TC 32, Fuses, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60269-4 on 2009-09-01.
This European Standard supersedes EN 60269-4:2007.
The significant technical changes to EN 60269-4:2007 are:
– the introduction of voltage source inverter fuse-links, including test requirements;
– coverage of the tests on operating characteristics for a.c. by the breaking capacity tests;
– the updating of examples of standardised fuse-links for the protection of semiconductor devices.
This standard is to be used in conjunction with EN 60269-1:2007, Low-voltage fuses – Part 1: General
requirements.
This Part 4 supplements or modifies the corresponding clauses or subclauses of Part 1.
Where no change is necessary, this Part 4 indicates that the relevant clause or subclause applies.
Tables and figures which are additional to those in Part 1 are numbered starting from 101.
Additional annexes are lettered AA, BB, etc.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2010-06-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2012-09-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60269-4:2009 was approved by CENELEC as a European
Standard without any modification.
__________
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SIST EN 60269-4:2010
- 3 - EN 60269-4:2009
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 60269-1 2006 Low-voltage fuses - EN 60269-1 2007
Part 1: General requirements
IEC 60269-2 (mod) 2006 Low-voltage fuses - HD 60269-2 2007
Part 2: Supplementary requirements for fuses
for use by authorized persons (fuses mainly
for industrial application) - Examples of
standardized systems of fuses A to I
IEC 60269-3 (mod) 2006 Low-voltage fuses - HD 60269-3 2007
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 60417 Data- Graphical symbols for use on equipment - -
base
1)
ISO 3 - Preferred numbers - Series of preferred - -
numbers
1)
Undated reference.
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SIST EN 60269-4:2010
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SIST EN 60269-4:2010
IEC 60269-4
®
Edition 5.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage fuses –
Part 4: Supplementary requirements for fuse-links for the protection of
semiconductor devices
Fusibles basse tension –
Partie 4: Exigences supplémentaires concernant les éléments de remplacement
utilisés pour la protection des dispositifs à semiconducteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XA
CODE PRIX
ICS 29.120.50 ISBN 2-8318-1041-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60269-4:2010
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CONTENTS
FOREWORD.4
1 General .6
1.1 Scope and object.6
1.2 Normative references .7
2 Terms and definitions .7
3 Conditions for operation in service.8
4 Classification.9
5 Characteristics of fuses .9
6 Markings .14
7 Standard conditions for construction.14
8 Tests .15
Annex AA (informative) Guidance for the coordination of fuse-links with
semiconductor devices .28
Annex BB (normative) Survey on information to be supplied by the manufacturer in
his literature (catalogue) for a fuse designed for the protection of semiconductor
devices .34
Annex CC (normative) Examples of standardized fuse-links for the protection of
semiconductor devices .35
Bibliography.52
Figure 101 – Conventional overload curve (example) (X and Y are points of verified
overload capability).24
Figure 102 – Example of a conventional test arrangement for bolted fuse-links.25
Figure 103 – Example of a conventional test arrangement for blade contact fuse-links .27
Figure CC.1 – Single body fuse-links .36
Figure CC.2 – Double body fuse-links .37
Figure CC.3 – Twin body fuse-links.38
Figure CC.4 – Striker fuse-links .38
Figure CC.5 – Fuse-links with bolted connections, type B, body sizes 000 and 00 .40
Figure CC.6 – Fuse-links with bolted connections, type B, body sizes 0, 1, 2 and 3 .41
Figure CC.7 – Bolted fuse-links, type C .43
Figure CC.8 – Flush end fuse-links, type A .45
Figure CC.9 – Flush end fuse-links, type B .47
Figure CC.10 – Fuse-links with cylindrical contact caps, type A .48
Figure CC.11 – Fuse-links with cylindrical contact caps, type B .50
Figure CC.12 – Fuse-links with cylindrical contact caps with striker, type B (additional
dimensions for all sizes except 10 × 38).51
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SIST EN 60269-4:2010
60269-4 © IEC:2009 – 3 –
Table 101 – Conventional times and currents for “gR” and “gS” fuse-links .11
Table 102 – List of complete tests.16
Table 103 – Survey of tests on fuse-links of the smallest rated current of a
homogeneous series.16
Table 104 – Values for breaking-capacity tests on a.c. fuses .21
Table 105 – Values for breaking-capacity tests on d.c. fuses .22
Table 106 – Values for breaking-capacity tests on VSI fuse-links.23
Table CC.1 – Conventional time and current for "gR" and "gS" fuse-links.39
Table CC.2 – Conventional time and current for "gR" and "gS" fuse-links.44
Table CC.3 – Preferred rated voltages and rated currents.49
Table CC.4 – Conventional time and current for "gR" and "gS" fuse-links.49
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE FUSES –
Part 4: Supplementary requirements for fuse-links
for the protection of semiconductor devices
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 60269-4 has been prepared by subcommittee 32B: Low-voltage
fuses, of IEC technical committee 32: Fuses.
The text of this standard is based on the following documents:
FDIS Report on voting
32B/535/FDIS 32B/541/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 fifth edition cancels and replaces the fourth edition published in 2006. It constitutes a
technical revision. The significant technical changes to the fourth edition are:
• the introduction of voltage source inverter fuse-links, including test requirements;
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SIST EN 60269-4:2010
60269-4 © IEC:2009 – 5 –
• coverage of the tests on operating characteristics for a.c. by the breaking capacity tests;
• the updating of examples of standardised fuse-links for the protection of semiconductor
devices.
This part is to be used in conjunction with IEC 60269-1:2006, Low-voltage fuses – Part 1:
General requirements.
This Part 4 supplements or modifies the corresponding clauses or subclauses of Part 1.
Where no change is necessary, this Part 4 indicates that the relevant clause or subclause
applies.
Tables and figures which are additional to those in Part 1 are numbered starting from 101.
Additional annexes are lettered AA, BB, etc.
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 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.
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SIST EN 60269-4:2010
– 6 – 60269-4 © IEC:2009
LOW-VOLTAGE FUSES –
Part 4: Supplementary requirements for fuse-links
for the protection of semiconductor devices
1 General
IEC 60269-1 applies with the following supplementary requirements.
Fuse-links for the protection of semiconductor devices shall comply with aIl requirements of
IEC 60269-1, if not otherwise indicated hereinafter, and shall also comply with the
supplementary requirements laid down below.
1.1 Scope and object
These supplementary requirements apply to fuse-links for application in equipment containing
semiconductor devices for circuits of nominal voltages up to 1 000 V a.c. or 1 500 V d.c. and
also, in so far as they are applicable, for circuits of higher nominal voltages.
NOTE 1 Such fuse-Iinks are commonly referred to as “semiconductor fuse-links”.
NOTE 2 In most cases, a part of the associated equipment serves the purpose of a fuse-base. Owing to the great
variety of equipment, no general rules can be given; the suitability of the associated equipment to serve as a fuse-
base should be subject to agreement between the manufacturer and the user. However, if separate fuse-bases or
fuse-holders are used, they should comply with the appropriate requirements of IEC 60269-1.
The object of these supplementary requirements is to establish the characteristics of
semiconductor fuse-links in such a way that they can be replaced by other fuse-links having
the same characteristics, provided that their dimensions are identical. For this purpose, this
standard refers in particular to
a) the following characteristics of fuses:
1) their rated values;
2) their temperature rises in normal service;
3) their power dissipation;
4) their time-current characteristics;
5) their breaking capacity;
2
6) their cut-off current characteristics and their I t characteristics;
7) their arc voltage characteristics;
b) type tests for verification of the characteristics of fuses;
c) the markings on fuses;
d) availability and presentation of technical data (see Annex B).
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60269-4 © IEC:2009 – 7 –
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.
IEC 60269-1:2006, Low-voltage fuses – General requirements
IEC 60269-2:2006, Low-voltage fuses – Supplementary requirements for fuses for use by
authorized persons (fuses mainly for industrial application) – Examples of standardized
systems of fuses A to I
IEC 60269-3:2006, Low-voltage fuses – Supplementary requirements for fuses for use by
unskilled persons (fuses mainly for household and similar applications) – Examples of
standardized systems of fuses A to F
IEC 60417, Graphical symbols for use on equipment
ISO 3, Preferred numbers – Series of preferred numbers
2 Terms and definitions
IEC 60269-1 applies with the following supplementary definitions.
2.2 General terms
2.2.101
semiconductor device
device whose essential characteristics are due to the flow of charge carriers within a
semiconductor
[IEV 521-04-01]
2.2.102
semiconductor fuse-link
current-limiting fuse-link capable of breaking, under specific conditions, any current value
within the breaking range (see 7.4)
2.2.103
signalling device
device forming part of the fuse and signalling the fuse operation to a remote place
NOTE A signalling device consists of a striker and an auxiliary switch. Electronic devices may also be used.
2.2.104
voltage source inverter
VSI
a voltage stiff inverter
[IEV 551-12-11]
NOTE Also referred to as a voltage stiff inverter i.e. an inverter that supplies current without any practical change
in its output voltage.
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SIST EN 60269-4:2010
– 8 – 60269-4 © IEC:2009
2.2.105
voltage source inverter fuse-link
VSI fuse-link
current-limiting fuse-link capable of breaking, under specified conditions, the short circuit
current supplied by the discharge of a d.c.-link capacitor in a voltage source inverter
NOTE 1 The abbreviation “VSI fuse-link” is used in this document.
NOTE 2 A VSI fuse-link usually operates under a short circuit current supplied by the discharge of a d.c.-link
capacitor through a very low inductance, in order to allow high frequency in normal operation. This short circuit
condition leads to a very high rate of rise of current equivalent to a low value of time constant, typically 1 ms to
3 ms. The supply voltage is d.c., even though the applied voltage decreases as the current increases during the
short circuit.
NOTE 3 In some multiple a.c. drive applications, individual output inverters may be remote from the main input
rectifier. In these cases, the associated fault circuit impedances may influence the operation of the fuse-links - the
associated time constant and the size of the capacitors need to be considered when choosing the appropriate short
circuit protection.
3 Conditions for operation in service
IEC 60269-1 applies with the following supplementary requirements.
3.4 Voltage
3.4.1 Rated voltage
For a.c., the rated voltage of a fuse-link is related to the applied voltage; it is based on the
r.m.s. value of a sinusoidal a.c. voltage. It is further assumed that the applied voltage retains
the same value throughout the operation of the fuse-link. All tests to verify the ratings are
based on this assumption.
NOTE In many applications, the applied voltage will be sufficiently close to the sinusoidal form for the significant
part of the operating time, but there are many cases where this condition is not satisfied.
The performance of a fuse-link subjected to a non-sinusoidal applied voltage can be
evaluated by comparing, for the first approximation, the arithmetic mean values of the non-
sinusoidal and sinusoidal applied voltages.
For d.c. and VSI fuse-links, the rated voltage of a fuse-link is related to the applied voltage. It
is based on the mean value. When d.c. is obtained by rectifying a.c., the ripple is assumed
not to cause a variation of more than 5 % above or 9 % below the mean value.
3.4.2 Applied voltage in service
Under service conditions, the applied voltage is that voltage which, in the fault circuit, causes
the current to increase to such proportions that the fuse-link will operate.
For a.c., consequently, the value of the applied voltage in a single-phase a.c. circuit is usually
identical to the power-frequency recovery voltage. For all cases other than the sinusoidal a.c.
voltage, it is necessary to know the applied voltage as a function of time.
For a unidirectional voltage and for VSI fuse-links, the important values are:
– the average value over the entire period of the operation of the fuse-link;
– the instantaneous value near the end of the arcing period.
3.5 Current
The rated current of a semiconductor fuse-link is based on the r.m.s. value of a sinusoidal a.c.
current at rated frequency.
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SIST EN 60269-4:2010
60269-4 © IEC:2009 – 9 –
For d.c., the r.m.s. value of current is assumed not to exceed the r.m.s. value based on a
sinusoidal a.c. current at rated frequency.
NOTE The thermal response time of the fuse-element may be so short that it cannot be assumed that operation
under conditions which deviate much from sinusoidal current can be estimated on the basis of the r.m.s. current
alone. This is so, in particular at lower frequency values and when the current presents salient peaks separated by
appreciable intervals of insignificant current; for example, in the case of frequency converters and traction
applications.
3.6 Frequency, power factor and time constant
3.6.1 Frequency
The rated frequency refers to the frequency of the sinusoidal current and voltage that form the
basis of the type tests.
NOTE In particular, where service frequency deviates significantly from rated frequency the manufacturer should
be consulted.
3.6.3 Time constant (τ)
For d.c., the time constants expected in practice are considered to correspond to those in
Table 105.
NOTE 1 Some service conditions may be found which exceed the specified performance shown in the table as
regards time constant. In such a case, a design of fuse-link which has been tested and marked accordingly should
be used or the suitability of such a fuse-link be subject to agreement between manufacturer and user. In some
service conditions, the time constant is significantly lower than the values stated in the table. In such a case, the
applied voltage can be higher than the rated voltage defined according to Table 105.
For VSI fuse-links, equivalent time constants expected in practice are considered to
correspond to those in Table 106.
NOTE 2 The high rate of rise of short circuit current is due to the low inductance, which is considered to be
equivalent to a low time constant.
3.10 Temperature inside an enclosure
Since the rated values of the fuse-links are based on specified conditions that do not always
correspond to those prevailing at the point of installation, including the local air conditions,
the user may have to consult the manufacturer concerning the possible need for re-rating.
4 Classification
IEC 60269-1 applies.
5 Characteristics of fuses
IEC 60269-1 applies with the following supplementary requirements.
5.1 Summary of characteristics
5.1.2 Fuse-links
a) Rated voltage (see 5.2)
b) Rated current (see 5.3 of IEC 60269-1)
c) Kind of current and frequency (see 5.4 of IEC 60269-1)
d) Rated power dissipation (see 5.5 of IEC 60269-1)
e) Time-current characteristics (see 5.6)
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SIST EN 60269-4:2010
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f) Breaking range (see 5.7.1 of IEC 60269-1)
g) Rated breaking capacity (see 5.7.2 of IEC 60269-1)
h) Cut-off current characteristics (see 5.8.1)
2
i) I t characteristics (see 5.8.2)
k) Dimensions or size (if applicable)
l) Arc voltage characteristics (see 5.9)
5.2 Rated voltage
For rated a.c. voltages up to 690 V and d.c. voltages up to 750 V, IEC 60269-1 applies; for
higher voltages, the values shall be selected from the R 5 series or, where not possible, from
the R 10 series of ISO 3.
A fuse-link shall have an a.c. voltage rating or a d.c. voltage rating or a VSI voltage rating. It
may have one or more of these voltage ratings.
5.4 Rated frequency
The rated frequency is that frequency to which the performance data are related.
5.5 Rated power dissipation of the fuse-link
In addition to the requirements of IEC 60269-1, the manufacturer shall indicate the power
dissipation as a function of current for the range 50 % to 100 % of the rated current or for
50 %, 63 %, 80 % and 100 % of the rated current.
NOTE In cases where the resistance of the fuse-link is of interest, this resistance should be determined from the
functional relation between the power dissipation and the associated value of current.
5.6 Limits of time-current characteristics
5.6.1 Time-current characteristics, time-current zones
5.6.1.1 General requirements
The time-current characteristics depend on the design of the fuse-link, and, for a given fuse-
link, on the ambient air temperature and the cooling conditions.
The manufacturer shall provide time-current characteristics based on an ambient temperature
of 20 °C to 25 °C in accordance with the conditions specifi
...
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