Miniature fuses - Part 8: Fuse resistors with particular overcurrent protection

IEC 60127-8:2018 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.
This part of IEC 60127 applies in addition to the requirements of IEC 60127-1.
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.
Keywords: Miniature Fuses, Fuse-Resistors, Overcurrent Protection

Coupe-circuit miniatures - Partie 8: Résistances de protection avec protection particulière contre les surintensités

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.

General Information

Status
Published
Publication Date
25-Jun-2018
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
26-Jun-2018
Ref Project

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IEC 60127-8
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 8: Fuse resistors with particular overcurrent protection
Coupe-circuit miniatures –
Partie 8: Résistances de protection avec protection particulière contre les
surintensités
IEC 60127-8:2018-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60127-8
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Miniature fuses –
Part 8: Fuse resistors with particular overcurrent protection
Coupe-circuit miniatures –
Partie 8: Résistances de protection avec protection particulière contre les
surintensités
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-6238-2

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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

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

---------------------- Page: 5 ----------------------
– 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 bilingual version (2018-12) corresponds to the monolingual English version, published in

2018-06.
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.
---------------------- Page: 6 ----------------------
IEC 60127-8:2018 © IEC 2018 – 5 –
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.
The French version of this standard has not been voted upon.

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.
---------------------- Page: 7 ----------------------
– 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.
---------------------- Page: 8 ----------------------
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

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
___________
This standard has been withdrawn.
---------------------- Page: 9 ----------------------
– 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
---------------------- Page: 10 ----------------------
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
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

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 temperature, rated voltage.
---------------------- Page: 11 ----------------------
– 10 – IEC 60127-8:2018 © IEC 2018
3.9
rated temperature

maximum ambient temperature at which the rated dissipation may be applied continuously

Note 1 to entry: The rated temperature has a value of 70 °C, unless otherwise prescribed in IEC 60115-1.

Note 2 to entry: Related terminology: rated dissipation.
3.10
rated voltage

DC or AC r.m.s. voltage calculated from the square root of the product of the rated resistance

and the rated dissipation

Note 1 to entry: At high values of resistance, the rated voltage may not be applicable because of the size and the

construction of the fuse resistor with particular overcurrent protection.

Note 2 to entry: Related terminology: rated dissipation, limiting element voltage.

3.11
minimum breaking dissipation

minimum value of the breaking dissipation which is equal to a multiple of the rated dissipation

and at which the fuse resistor with particular overcurrent protection can still safely interrupt

the circuit

Note 1 to entry: In this standard the minimum breaking dissipation is specified to be 16 times the rated dissipation.

This value corresponds to the values given by most of the manufacturers.
4 General requirements
The requirements of IEC 60127-1:2006, Clause 4, are replaced as follows:
Fuse res
...

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