SIST EN IEC 60127-8:2019

Miniature fuses - Part 8: Fuse resistors with particular overcurrent protection (IEC 60127-8:2018)

This part of IEC 60127 relates to fuse resistors with particular overcurrent protection rated up
to AC 500 V and/or DC 500 V for printed circuits and other substrate systems, used for the
protection of electric appliances, electronic equipment and component parts thereof, normally
intended to be used indoors.
It does not apply to fuse resistors with particular overcurrent protection for appliances
intended to be used under special conditions, such as in a corrosive or explosive atmosphere.
The object of this part of IEC 60127 is
a) to establish uniform requirements for fuse resistors with particular overcurrent protection
so as to protect appliances or parts of appliances in the most suitable way;
b) to define the performance of the fuse resistors with particular overcurrent protection, so as
to give guidance to manufacturers of electrical appliances and electronic equipment and to
ensure replacement of fuse resistors with particular overcurrent protection by those of
similar dimensions and characteristics;
c) to establish uniform test methods for fuse resistors with particular overcurrent protection,
so as to allow verification of the values (for example rated dissipation, functioning
characteristic and rated breaking capacity values) specified by the manufacturer.
Manufacturers of fuse resistors with particular overcurrent protection shall ensure on their
own responsibility that their products comply with the requirements of the resistor-related
standards IEC 60115-1, IEC 60115-4-101 and IEC 60115-4-1021.
This part of IEC 60127 applies in addition to the requirements of IEC 60127-1.

Geräteschutzsicherungen - Teil 8: Sicherungswiderstände für Teilbereichsschutz (IEC 60127-8:2018)

Coupe-circuits miniatures – Partie 8 : Résistances fusibles avec une protection particulière contre les surintensités (IEC 60127-8:2018)

IEC 60127-8: 2018 porte sur les résistances de protection avec protection particulière contre les surintensités assignées jusqu’à 500 V en courant alternatif et/ou 500 V en courant continu pour les circuits imprimés et autres systèmes de substrat employés pour la protection d'appareils électriques, d’équipements électroniques et de leurs éléments constituants, normalement destinés à être utilisés à l'intérieur.
Elle n’est pas applicable aux résistances de protection avec protection particulière contre les surintensités placées dans des appareils destinés à être utilisés dans des conditions particulières, telles que des atmosphères corrosives ou explosives.
L’objet de la présente partie de l’IEC 60127 est
a) d’établir des exigences uniformes pour les résistances de protection avec protection particulière contre les surintensités afin de protéger les appareils ou les parties d’appareils de la façon la plus appropriée;
b) de définir les performances des résistances de protection avec protection particulière contre les surintensités afin de donner des recommandations aux fabricants d’appareils électriques et d'équipements électroniques et d’assurer le remplacement des résistances de protection avec protection particulière contre les surintensités par des résistances de dimensions et de caractéristiques similaires;
c) d’établir des méthodes d’essai uniformes pour les résistances de protection avec protection particulière contre les surintensités afin de permettre la vérification des valeurs spécifiées par le fabricant (par exemple, la dissipation assignée, la caractéristique de fonctionnement et le pouvoir de coupure assigné).
La présente partie de l'IEC 60127 s'applique en complément des exigences de l'IEC 60127-1.
Cette première édition de l’IEC 60127-8 annule et remplace l’IEC PAS 60127-8:2014.
La présente Norme internationale doit être utilisée conjointement avec l’IEC 60127-1.

Miniaturne varovalke - 8. del: Varovalčni upori s posebno nadtokovno zaščito (IEC 60127-8:2018)

Ta del standarda IEC 60127 se nanaša na varovalčne upore s posebno nadtokovno zaščito z nazivno vrednostjo do vključno 500 V izmenične napetosti in/ali 500 V enosmerne napetosti za tiskana vezja in sisteme z drugo podlago ter se uporabljajo za zaščito električnih naprav in elektronske opreme ter njihovih sestavnih delov, ki so običajno namenjeni za uporabo v zaprtih prostorih.
Ne uporablja se za varovalčne upore s posebno nadtokovno zaščito za naprave, namenjene uporabi pod posebnimi pogoji, na primer v korozivnem ali eksplozivnem ozračju. Namen tega dela standarda IEC 60127 je:
a) vzpostaviti enotne zahteve za varovalčne upore s posebno nadtokovno zaščito, tako da se zagotovi najprimernejša zaščita naprav ali delov naprav;
b) opredeliti zmogljivost varovalčnih uporov s posebno nadtokovno zaščito, tako da se proizvajalcem električnih naprav in elektronske opreme podajo smernice ter se zagotovi zamenjava varovalčnih uporov s posebno nadtokovno zaščito z varovalčnimi upori podobnih mer in lastnosti;
c) vzpostaviti enotne preskusne metode za varovalčne upore s posebno nadtokovno zaščito, tako da se omogoči preverjanje vrednosti (na primer hitrost odvajanja, lastnost delovanja in nazivne vrednosti zmogljivosti prekinitve), ki jih določi proizvajalec.
Proizvajalci varovalčnih uporov s posebno nadtokovno zaščito morajo na lastno odgovornost zagotoviti, da so njihovi proizvodi v skladu z zahtevami standardov IEC 60115-1, IEC 60115-4-101 in IEC 60115-4-1021 v zvezi z upori.
Ta del standarda IEC 60127 se poleg tega uporablja za zahteve iz standarda IEC 60127-1.

General Information

• Status: Published
• Publication Date: 12-Mar-2019
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: EVA - Fuses
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Aug-2018
• Due Date: 03-Nov-2018
• Completion Date: 13-Mar-2019
• Ref Project: EN IEC 60127-8:2018 - Miniature fuses - Part 8: Fuse resistors with particular overcurrent protection

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60127-8:2019
01-april-2019
0LQLDWXUQHYDURYDONHGHO9DURYDOþQLXSRULVSRVHEQRQDGWRNRYQR]DãþLWR,(&

Miniature fuses - Part 8: Fuse resistors with particular overcurrent protection (IEC 60127-
8:2018)
Geräteschutzsicherungen - Teil 8: Sicherungswiderstände für Teilbereichsschutz (IEC
60127-8:2018)
Coupe-circuits miniatures – Partie 8 : Résistances fusibles avec une protection
particulière contre les surintensités (IEC 60127-8:2018)
Ta slovenski standard je istoveten z: EN IEC 60127-8:2018
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
SIST EN IEC 60127-8:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60127-8:2019

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SIST EN IEC 60127-8:2019


EUROPEAN STANDARD EN IEC 60127-8

NORME EUROPÉENNE

EUROPÄISCHE NORM
August 2018
ICS 29.120.50

English Version
Miniature fuses - Part 8: Fuse resistors with particular
overcurrent protection
(IEC 60127-8:2018)
Coupe-circuits miniatures – Partie 8 : Résistances fusibles Geräteschutzsicherungen - Teil 8: Sicherungswiderstände
avec une protection particulière contre les surintensités für Teilbereichsschutz
(IEC 60127-8:2018) (IEC 60127-8:2018)
This European Standard was approved by CENELEC on 2018-07-31. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60127-8:2018 E

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SIST EN IEC 60127-8:2019
EN IEC 60127-8:2018 (E)
European foreword
The text of document 32C/542/FDIS, future edition 1 of IEC 60127-8, prepared by SC 32C "Miniature
fuses" of IEC/TC 32 "Fuses" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60127-8:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-07-31
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60127-8:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60068-2-58:2015 NOTE Harmonized as EN 60068-2-58:2015 (not modified)
IEC 61191-2:2013 NOTE Harmonized as EN 61191-2:2013 (not modified)



2

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SIST EN IEC 60127-8:2019
EN IEC 60127-8:2018 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60063 2015 Preferred number series for resistors and EN 60063 2015
capacitors
IEC 60068-2-21 2006 Environmental testing - Part 2-21: Tests - EN 60068-2-21 2006
Test U: Robustness of terminations and
integral mounting devices
IEC 60115-1 (mod) 2008 Fixed resistors for use in electronic EN 60115-1 2011
equipment -- Part 1: Generic specification
- -  + A11 2015
IEC 60115-4-101 1995 Fixed resistors for use in electronic - -
equipment - Part 4: Detail specification:
Fixed power wirewound resistors with
solderable axial wire leads - Stability class
5%. Assessment level E
IEC 60115-4-102 1995 Fixed resistors for use in electronic - -
equipment - Part 4: Detail specification:
Fixed power wirewound resistors with
solderable axial wire leads - Stability class
1%. Assessment level E
IEC 60127-1 2006 Miniature fuses -- Part 1: Definitions for EN 60127-1 2006
miniature fuses and general requirements
for miniature fuse-links
+ A1 2011  + A1 2011
+ A2 2015  + A2 2015
IEC 60194 2015 Printed board design, manufacture and - -
assembly - Terms and definitions
IEC 60664-1 2007 Insulation coordination for equipment EN 60664-1 2007
within low-voltage systems - Part 1:
Principles, requirements and tests
3

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SIST EN IEC 60127-8:2019
EN IEC 60127-8:2018 (E)
IEC 60695-2-12 2010 Fire hazard testing -- Part 2-12: EN 60695-2-12 2010
Glowing/hot-wire based test methods -
Glow-wire flammability index (GWFI) test
method for materials
IEC 60695-2-13 2010 Fire hazard testing -- Part 2-13: EN 60695-2-13 2010
Glowing/hot-wire based test methods -
Glow-wire ignition temperature (GWIT) test
method for materials
IEC 60695-4 2012 Fire hazard testing - Part 4: Terminology EN 60695-4 2012
concerning fire tests for electrotechnical
products
IEC 61249-2-7 2002 Materials for printed boards and other EN 61249-2-7 2002
interconnecting structures - Part 2-7:
Reinforced base materials clad and unclad
- Epoxide woven E-glass laminated sheet
of defined flammability (vertical burning
test), copper-clad
- -  + corrigendum 2005
Sep.



4

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SIST EN IEC 60127-8:2019



IEC 60127-8

®


Edition 1.0 2018-06




INTERNATIONAL



STANDARD



















Miniature fuses –

Part 8: Fuse resistors with particular overcurrent protection



























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 29.120.50 ISBN 978-2-8322-5843-9




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


® Registered trademark of the International Electrotechnical Commission

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SIST EN IEC 60127-8:2019
– 2 – IEC 60127-8:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General requirements . 10
5 Standard ratings . 10
6 Marking . 11
7 General notes on tests . 11
7.1 Atmospheric conditions for testing . 11
7.2 Type tests . 11
7.2.1 General . 11
7.3 Fuse-bases for tests . 12
7.3.1 General . 12
7.3.2 General requirements . 12
7.3.3 Through-hole mounting of fuse resistors with particular overcurrent
protection . 13
7.3.4 Surface mounting of fuse resistors with particular overcurrent protection . 13
7.4 Nature of supply . 13
8 Dimensions and construction . 13
8.1 Dimensions . 13
8.1.1 Creepage distances and clearances . 13
8.2 Construction . 14
8.3 Terminations . 14
8.3.1 Through-hole mount fuse resistors with particular overcurrent protection . 15
8.3.2 Surface mount fuse resistors with particular overcurrent protection . 15
8.4 Alignment and configuration of terminations . 15
8.5 Soldered joints . 15
8.6 Solderability of terminations . 16
8.7 Resistance to soldering heat . 16
9 Electrical requirements . 16
9.1 Resistance value . 16
9.2 Functioning characteristic at the minimum breaking dissipation. 16
9.2.1 Functioning characteristic at an ambient temperature of 70 °C . 16
9.2.2 Test at elevated temperature . 16
9.2.3 Test procedure . 16
9.2.4 Presentation of results . 17
9.3 Rated breaking capacity. 17
9.3.1 Operating conditions . 17
9.3.2 Criteria for satisfactory performance . 17
9.3.3 Insulation resistance . 18
9.3.4 Dielectric strength. 18
9.4 Endurance tests . 18
9.5 Maximum sustained dissipation . 18

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SIST EN IEC 60127-8:2019
IEC 60127-8:2018 © IEC 2018 – 3 –
9.6 Pulse tests . 18
9.7 Temperature of fuse resistors with particular overcurrent protection. 18
9.8 Operating overvoltage . 19
Bibliography . 25

Figure 1 – Test board for through-hole mount fuse resistors with particular overcurrent
protection . 21
Figure 2 – Test board for surface mount fuse resistors with particular overcurrent
protection . 22
Figure 3 – Test fuse-base . 23
Figure 4 – Bending jig for surface mount fuse resistors with particular overcurrent
protection . 24
Figure 5 – Test circuit for the tests according to 9.3 . 24

Table 1 – Creepage distances and clearances (absolute minimum values) . 14
Table 2 – Test voltages for dielectric strength . 18
Table 3 – Testing schedule for individual dissipation ratings . 20

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SIST EN IEC 60127-8:2019
– 4 – IEC 60127-8:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MINIATURE FUSES –

Part 8: Fuse resistors with particular
overcurrent protection

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60127-8 has been prepared by subcommittee SC 32C: Miniature
fuses, of IEC technical committee 32: Fuses
This first edition of IEC 60127-8 cancels and replaces IEC PAS 60127-8:2014.
This international standard is to be used in conjunction with IEC 60127-1.
The text of this International Standard is based on the following documents:
FDIS Report on voting
32C/542/FDIS 32C/546/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.

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SIST EN IEC 60127-8:2019
IEC 60127-8:2018 © IEC 2018 – 5 –
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60127 series, published under the general title Miniature fuses,
can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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SIST EN IEC 60127-8:2019
– 6 – IEC 60127-8:2018 © IEC 2018
INTRODUCTION
In recent years, so-called “fuse resistors” have increasingly been used in electrical and
electronic applications. The term “fuse resistor”, however, which has become established in
the market, is misleading. The actual function of a fuse resistor is that of a resistor in an
electrical or electronic circuit. Only when an overload of multiple times the rated dissipation
occurs can fuse resistors interrupt an electric current. In a wide range between the rated
dissipation and the manufacturer’s specified breaking dissipation, fuse resistors provide poor
or no overcurrent protection. Therefore if they are incorrectly rated and improperly used in an
application, this may result in potential risk of fire.
Fuse resistors perform the function of a fuse only within a particular overcurrent range, and,
from a technical point of view, must therefore be referred to as “fuse resistors with particular
overcurrent protection”.
Fuse resistors with particular overcurrent protection can safely interrupt high short-circuit
currents, but are not capable of interrupting overload currents.
For safety reasons, they are only used in combination with an accompanying overload current
protection device, if overload currents cannot be excluded to occur in the respective
application.

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SIST EN IEC 60127-8:2019
IEC 60127-8:2018 © IEC 2018 – 7 –
MINIATURE FUSES –

Part 8: Fuse resistors with particular
overcurrent protection



1 Scope
This part of IEC 60127 relates to fuse resistors with particular overcurrent protection rated up
to AC 500 V and/or DC 500 V for printed circuits and other substrate systems, used for the
protection of electric appliances, electronic equipment and component parts thereof, normally
intended to be used indoors.
It does not apply to fuse resistors with particular overcurrent protection for appliances
intended to be used under special conditions, such as in a corrosive or explosive atmosphere.
The object of this part of IEC 60127 is
a) to establish uniform requirements for fuse resistors with particular overcurrent protection
so as to protect appliances or parts of appliances in the most suitable way;
b) to define the performance of the fuse resistors with particular overcurrent protection, so as
to give guidance to manufacturers of electrical appliances and electronic equipment and to
ensure replacement of fuse resistors with particular overcurrent protection by those of
similar dimensions and characteristics;
c) to establish uniform test methods for fuse resistors with particular overcurrent protection,
so as to allow verification of the values (for example rated dissipation, functioning
characteristic and rated breaking capacity values) specified by the manufacturer.
Manufacturers of fuse resistors with particular overcurrent protection shall ensure on their
own responsibility that their products comply with the requirements of the resistor-related
1
standards IEC 60115-1, IEC 60115-4-101 and IEC 60115-4-102 .
This part of IEC 60127 applies in addition to the requirements of IEC 60127-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60063:2015, Preferred number series for resistors and capacitors
IEC 60068-2-21:2006, Environmental testing – Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
IEC 60115-1:2008, Fixed resistors for use in electronic equipment – Part 1: Generic
specification
___________
1
This standard has been withdrawn.

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– 8 – IEC 60127-8:2018 © IEC 2018
IEC 60115-4-101:1995, Fixed resistors for use in electronic equipment – Part 4: Detail
specification: Fixed power wirewound resistors with solderable axial wire leads – Stability
class 5%. Assessment level E
IEC 60115-4-102:1995, Fixed resistors for use in electronic equipment – Part 4: Detail
specification: Fixed power wirewound resistors with solderable axial wire leads – Stability
class 1 % – Assessment level E
IEC 60127-1:2006, Miniature fuses – Part 1: Definitions for miniature fuses and general
requirements for miniature fuse-links
IEC 60127-1:2006/AMD1:2011
IEC 60127-1:2006/AMD2:2015
IEC 60194:2015, Printed board design, manufacture and assembly – Terms and definitions
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-12:2010, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –
Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-13:2010, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products
IEC 61249-2-7:2002, Materials for printed boards and other interconnecting structures –
Part 2-7: Reinforced base materials clad and unclad – Epoxide woven E-glass laminated
sheet of defined flammability (vertical burning test), copper-clad
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Clause 3 of IEC 60127-
1:2006 as well as IEC 60115-1, IEC 60115-4-101 and IEC 60115-4-102 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
fuse resistor with particular overcurrent protection
resistor with the added function of a fuse, characterized as being capable of continuously
carrying currents up to at least the rated dissipation and of interrupting currents above a
defined multiple of the rated dissipation up to its rated breaking capacity
Note 1 to entry: Fuse resistors with particular overcurrent protection can safely interrupt high short-circuit
currents, but are not capable of interrupting overload currents. They are therefore allowed to be used only in
combination with an accompanying overload current protection device such as a miniature fuse according to parts
2, 3, 4 and 7, if overload currents cannot be excluded to occur in the respective application.
3.2
fuse resistor with particular overcurrent protection for through-hole mounting
fuse resistor with particular overcurrent protection designed for soldering directly into a
printed wiring board, with insertion of its leads in suitably designed holes

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SIST EN IEC 60127-8:2019
IEC 60127-8:2018 © IEC 2018 – 9 –
3.3
fuse resistor with particular overcurrent protection for surface mounting
fuse resistor with particular overcurrent protection designed for direct conductive attachment
by solder or other means onto the surface of a substrate, without insertion of its leads in
suitably designed holes or sockets
3.4
land
portion of a conductive pattern usually but not exclusively used for the connection and/or
attachment of components
SEE: IEC 60194
Note 1 to entry: Further definitions which may be useful in the application of surface-mount fuse resistors with
particular overcurrent protection may be found in IEC 60115-1 and IEC 60115-8.
3.5
critical resistance
resistance value at which the rated voltage is equal to the limiting element voltage
Note 1 to entry: At an ambient temperature of 70 °C, the maximum voltage which may be applied across the
terminations of a fuse resistor with particular overcurrent protection is either the calculated rated voltage, if the
resistance is less than the critical resistance, or the limiting element voltage, if the resistance is equal to or greater
than the critical resistance. At temperatures other than 70 °C, it is important that account be taken of the derating
curve and of the limiting element voltage in the calculation of any voltage to be applied
Note 2 to entry: Related terminology: Rated voltage, limiting element voltage.
3.6
limiting element voltage
U
max
maximum DC or AC r.m.s. voltage that may be continuously applied to the terminations of a
fuse resistor with particular overcurrent protection (generally dependent upon size and
manufacturing technology of the fuse resistor with particular overcurrent protection)
Note 1 to entry: Where the term "AC r.m.s. voltage" is used in this standard, the peak voltage should not exceed
1,42 times the r.m.s. value.
Note 2 to entry: This voltage can only be applied to fuse resistors with particular overcurrent protection when the
resistance value is equal to or higher than the critical resistance value.
Note 3 to entry: Related terminology: rated voltage, critical resistance.
3.7
rated resistance
resistance value for which the fuse resistor with particular overcurrent protection has been
designed, and which is generally used for denomination of the fuse resistor with particular
overcurrent protection
3.8
rated dissipation
P
70
maximum permissible dissipation at an ambient temperature of 70 °C under the conditions of
the respective acceptance criteria
Note 1 to entry: If the rated dissipation depends on special means supporting the abduction of the dissipation to
the environment, for example, special circuit board material, special conductor dimensions, heat-sink, such means
have to be identified whenever the rated dissipation is mentioned.
Note 2 to entry: Related terminology: rated tempe
...