Thermal-links - Requirements and application guide

IEC 60694:2015 is applicable to thermal-links intended for incorporation in electrical appliances, electronic equipment and component parts thereof, normally intended for use indoors, in order to protect them against excessive temperatures under abnormal conditions. This standard may be applicable to thermal-links for use under conditions other than indoors, provided that the climatic and other circumstances in the immediate surroundings of such thermal-links are comparable with those in this standard. This standard may be applicable to thermal-links in their simplest forms (e.g. melting strips or wires), provided that molten materials expelled during function cannot adversely interfere with the safe use of the equipment, especially in the case of hand-held or portable equipment, irrespective of its position. Annex H of this standard is applicable to thermal-link packaged assemblies where the thermal-link(s) has already been approved to this standard but packaged in a metallic or non-metallic housing and provided with terminals/wiring leads. This standard is applicable to thermal-links with a rated voltage not exceeding 690 V a.c. or d.c. and a rated current not exceeding 63 A. The objectives of this standard are: to establish uniform requirements for thermal-links, to define methods of test, to provide useful information for the application of thermal-links in equipment. This standard is not applicable to thermal-links used under extreme conditions such as corrosive or explosive atmospheres. This standard is not applicable to thermal-links to be used in circuits on a.c. with a frequency lower than 45 Hz or higher than 62 Hz. This fourth edition cancels and replaces the third edition published in 2002, Amendment 1:2006 and Amendment 2:2010. This fourth edition constitutes a technical revision. This fourth edition includes the following significant technical changes with respect to the previous edition: - requirements for thermal-link packaged assemblies; - renew the requirements and definitions for Th-test; - change starting temperature for interrupt current test; - clarify requirements for marking (packing label); - minimum Proof Tracking Index 175 instead 120. Keywords: thermal protection of equipment, thermal-links

Temperatursicherungen - Anforderungen und Anwendungshinweise

Protecteurs thermiques - Exigences et guide d'application

L'IEC 60691:2015 est applicable aux protecteurs thermiques destinés à être incorporés dans les appareils électriques, le matériel électronique et ses composants, normalement utilisés à l'intérieur d'un local, afin de les protéger contre les températures excessives lors de conditions anormales. La présente Norme peut s'appliquer aux protecteurs thermiques utilisés dans d'autres conditions que celles qui sont réunies à l'intérieur d'un local, pourvu que les conditions climatiques ou autres de l'entourage immédiat de tels protecteurs thermiques soient comparables à celles de la présente Norme. La présente Norme peut s'appliquer aux protecteurs thermiques dans leurs formes les plus simples (par exemple les lames ou les fils de fusion), pourvu que le matériau fondu, expulsé pendant le fonctionnement, ne soit pas préjudiciable à la sécurité du matériel, particulièrement dans le cas du matériel tenu à la main, ou mobile indépendamment de sa position. L'Annexe H de la présente Norme s'applique aux ensembles conditionnés de protecteurs thermiques déjà conformes à la présente Norme mais conditionnés dans un boîtier métallique ou non métallique et munis de bornes/conducteurs à fils. La présente Norme s'applique aux protecteurs thermiques dont la tension assignée n'excède pas 690 V en courant alternatif ou en courant continu, et dont le courant assigné n'excède pas 63 A. Les objectifs de la présente Norme sont les suivants: établir des exigences uniformes pour les protecteurs thermiques, définir des méthodes d'essai, fournir des renseignements utiles pour l'utilisation des protecteurs thermiques dans les matériels. La présente Norme n'est pas applicable aux protecteurs thermiques utilisés dans des conditions extrêmes, telles que des atmosphères corrosives ou explosives. La présente Norme n'est pas applicable aux protecteurs thermiques destinés à être utilisés dans des circuits en courant alternatif avec une fréquence inférieure à 45 Hz ou supérieure à 62 Hz. Cette quatrième édition annule et remplace la troisième édition parue en 2002, l'Amendement 1:2006 et l'Amendement 2:2010. Cette quatrième édition constitue une révision technique. Cette quatrième édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - exigences relatives aux ensembles conditionnés de protecteurs thermiques; - reformulation des exigences et des définitions relatives à l'essai Th; - modification de la température initiale pour l'essai de courant de coupure; - clarification des exigences de marquage (étiquette de conditionnement); - Indice de tenue au cheminement minimum égal à 175 au lieu de 120. Mots clés: protection thermique des matériels, protecteurs thermiques

Termični taljivi vložki - Zahteve in navodilo za uporabo (IEC 60691:2015 + popravek COR1:2016)

Ta mednarodni standard se uporablja za termične taljive vložke, namenjene za vgradnjo v električne naprave in elektronsko opremo ter njihove sestavne dele, ki so običajno predvideni za notranjo uporabo, z namenom zagotavljanja zaščite pred prekomernimi temperaturami v izrednih razmerah.
OPOMBA 1: Oprema ni zasnovana za ustvarjanje toplote.
OPOMBA 2: Učinkovitost zaščite pred prekomernimi temperaturami je seveda odvisna od položaja in načina vgradnje termičnega taljivega vložka ter toka, ki ga prevaja.
Ta standard se lahko uporablja za termične taljive vložke, namenjene za uporabo pri pogojih, ki ne vključujejo notranje uporabe, pod pogojem, da so podnebne in druge razmere v neposredni okolici bližini takih termičnih taljivih vložkov primerljive z razmerami, opisanimi v tem standardu.
Ta standard se lahko uporablja za termične taljive vložke v najosnovnejši obliki (npr. taljivi trakovi ali žice) pod pogojem, da staljeni materiali, ki se izločijo v primeru uporabe vložkov, ne vplivajo škodljivo na varno uporabo opreme, zlasti pri ročni ali prenosni opremi, ne glede na svoj položaj.
Priloga H tega standarda se uporablja za sklope termičnih taljivih vložkov, predhodno odobrenih za uporabo v skladu s tem standardom, ki so vstavljeni v kovinsko ali nekovinsko ohišje in vključujejo priključke/žične vodnike.
Ta standard se uporablja za termične taljive vložke z nazivno napetostjo največ 690 V izmenične ali
enosmerne napetosti in nazivnim tokom največ 63 A.
Namen tega standarda je:
a) vzpostaviti enotne zahteve za termične taljive vložke,
b) določiti preskusne metode,
c) podati uporabne informacije za uporabo termičnih taljivih vložkov v opremi.
Ta standard se ne uporablja za termične taljive vložke, ki se uporabljajo v ekstremnih pogojih, kot so korozivne ali eksplozivne atmosfere.
Ta standard se ne uporablja za termične taljive vložke, predvidene za uporabo v vezjih izmenične napetosti s frekvenco manj kot 45 Hz ali več kot 62 Hz.

General Information

Status
Published
Publication Date
06-Oct-2016
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
08-Apr-2016

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SLOVENSKI STANDARD
SIST EN 60691:2017
01-april-2017
1DGRPHãþD
SIST EN 60691:2004
SIST EN 60691:2004/A1:2007
SIST EN 60691:2004/A2:2010

7HUPLþQLWDOMLYLYORåNL=DKWHYHLQQDYRGLOR]DXSRUDER ,(&SRSUDYHN

&25
Thermal-links - Requirements and application guide (IEC 60691:2015 + COR1:2016)
Temperatursicherungen - Anforderungen und Anwendungshinweise (IEC 60691:2015 +
COR1:2016)
Protecteurs thermiques - Exigences et guide d'application (IEC 60691:2015 +
COR1:2016)
Ta slovenski standard je istoveten z: EN 60691:2016
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
SIST EN 60691:2017 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60691:2017
---------------------- Page: 2 ----------------------
SIST EN 60691:2017
EUROPEAN STANDARD EN 60691
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2016
ICS 29.120.50 Supersedes EN 60691:2003
English Version
Thermal-links -
Requirements and application guide
(IEC 60691:2015 + COR1:2016)
Protecteurs thermiques - Temperatursicherungen -
Exigences et guide d'application Anforderungen und Anwendungshinweise
(IEC 60691:2015 + COR1:2016) (IEC 60691:2015 + COR1:2016)

This European Standard was approved by CENELEC on 2015-11-12. 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, 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: Avenue Marnix 17, B-1000 Brussels

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60691:2016 E
---------------------- Page: 3 ----------------------
SIST EN 60691:2017
EN 60691:2016
European foreword

The text of document 32C/512/FDIS, future edition 4 of IEC 60691, 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 60691:2016.
The following dates are fixed:
(dop) 2017-04-07
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2019-10-07
• latest date by which the national standards conflicting with
the document have to be withdrawn
This document supersedes EN 60691:2003.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.

This document has been prepared under a mandate given to CENELEC by the European Commission

and the European Free Trade Association.
Endorsement notice

The text of the International Standard IEC 60691:2015 + COR1:2016 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 60085:2007 NOTE Harmonized as EN 60085:2008 (not modified).
IEC 60695-10-3:2002 NOTE Harmonized as EN 60695-10-3:2002 (not modified).
IEC 60695-11-20:1999/A1:2003 NOTE Harmonized as EN 60695-11-20:1999/A1:2003
(not modified).

IEC 60127-1:2006/A1:2011 NOTE Harmonized as EN 60127-1:2006/A1:2011 (not modified).

IEC 60216-1:2013 NOTE Harmonized as EN 60216-1:2013 (not modified).
IEC 60695-2-11:2014 NOTE Harmonized as EN 60695-2-11:2014 (not modified).
---------------------- Page: 4 ----------------------
SIST EN 60691:2017
EN 60691:2016
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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 60065 (mod) 2014 Audio, video and similar electronic EN 60065 2014
apparatus - Safety requirements
IEC 60112 2003 Method for the determination of the EN 60112 2003
proof and the comparative tracking
+ A1 2009 + A1 2009
indices of solid insulating materials
IEC 60127-2 2014 Miniature fuses - EN 60127-2 2014
Part 2: Cartridge fuse-links
IEC 60216-5 2008 Electrical insulating materials - Thermal EN 60216-5 2008
endurance properties -
Part 5: Determination of relative thermal
endurance index (RTE) of an insulating
material
IEC 60664-1 2007 Insulation coordination for equipment EN 60664-1 2007
within low-voltage systems -
Part 1: Principles, requirements and
tests
IEC 60695-2-12 2010 Fire hazard testing - EN 60695-2-12 2010
Part 2-12: Glowing/hot-wire based test
+ A1 2014 + A1 2014
methods - Glow-wire flammability index
(GWFI) test method for materials
IEC 60695-2-13 2010 Fire hazard testing - EN 60695-2-13 2010
Part 2-13: Glowing/hot-wire based test
+ A1 2014 + A1 2014
methods - Glow-wire ignition
temperature (GWIT) test method for
materials
IEC 60695-10-2 2014 Fire hazard testing - EN 60695-10-2 2014
Part 10-2: Abnormal heat - Ball pressure
test method
---------------------- Page: 5 ----------------------
SIST EN 60691:2017
EN 60691:2016
Publication Year Title EN/HD Year
IEC 60695-11-10 2013 Fire hazard testing - EN 60695-11-10 2013
Part 11-10: Test flames - 50 W
horizontal and vertical flame test
methods
IEC 60730-1 (mod) 2013 Automatic electrical controls - EN 60730-1 2016
Part 1: General requirements
IEC 61210 (mod) 2010 Connecting devices - Flat quick-connect EN 61210 2010
terminations for electrical copper
conductors - Safety requirements
---------------------- Page: 6 ----------------------
SIST EN 60691:2017
IEC 60691
Edition 4.0 2015-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Thermal-links – Requirements and application guide
Protecteurs thermiques – Exigences et guide d'application
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-2921-7

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: 7 ----------------------
SIST EN 60691:2017
– 2 – IEC 60691:2015 © IEC 2015
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 General requirements .................................................................................................... 10

5 General notes on tests .................................................................................................. 11

6 Classification ................................................................................................................. 13

6.1 Electrical conditions .............................................................................................. 13

6.2 Thermal conditions................................................................................................ 14

6.3 Resistance to tracking ........................................................................................... 14

7 Marking ......................................................................................................................... 14

8 Documentation .............................................................................................................. 15

9 Constructional requirements .......................................................................................... 15

9.1 General ................................................................................................................. 15

9.2 Lead secureness tests .......................................................................................... 16

9.2.1 General ......................................................................................................... 16

9.2.2 Tensile test .................................................................................................... 16

9.2.3 Thrust test ..................................................................................................... 17

9.2.4 Bending/twist test .......................................................................................... 17

9.3 Contacts used for the current path ........................................................................ 18

9.4 Accessible mounting brackets or metal parts ........................................................ 18

9.5 Insulating materials ............................................................................................... 18

9.6 Resistance to tracking ........................................................................................... 18

9.7 Creepage distances and clearances ...................................................................... 18

9.8 Temperature and humidity cycle conditioning ........................................................ 19

9.9 Terminals and terminations ................................................................................... 19

10 Electrical requirements .................................................................................................. 19

10.1 Dielectric strength ................................................................................................. 19

10.2 Insulation resistance ............................................................................................. 20

10.3 Interrupting current ............................................................................................... 21

10.3.1 General ......................................................................................................... 21

10.3.2 Specific conditions ......................................................................................... 21

10.4 Transient overload current .................................................................................... 22

10.5 Limited short-circuit test ........................................................................................ 23

10.5.1 General ......................................................................................................... 23

10.5.2 Test method .................................................................................................. 23

10.5.3 Fuse size (rating) ........................................................................................... 23

10.5.4 Compliance ................................................................................................... 24

11 Temperature tests ......................................................................................................... 24

11.1 General ................................................................................................................. 24

11.2 Holding temperature, T ........................................................................................ 24

11.3 Rated functioning temperature, T ......................................................................... 25

11.4 Maximum temperature limit, T ............................................................................ 25

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SIST EN 60691:2017
IEC 60691:2015 © IEC 2015 – 3 –

11.5 Ageing .................................................................................................................. 25

12 Resistance to rusting ..................................................................................................... 26

13 Manufacturer’s validation programme ............................................................................ 26

Annex A (normative) Application guide................................................................................. 28

Annex B (normative) Alternative ageing test for thermal-links with T greater than

250 °C for use in electric irons .............................................................................................. 29

Annex C (normative) Conductive heat ageing test ................................................................ 30

C.1 Conductive heat ageing test .................................................................................. 30

C.2 Method ................................................................................................................. 30

C.3 Ageing .................................................................................................................. 31

C.4 Results ................................................................................................................. 32

C.5 Dielectric strength test .......................................................................................... 32

C.6 Test oven .............................................................................................................. 32

Annex D (informative) Extended holding temperature evaluation .......................................... 34

D.1 Extended holding temperature conditioning test .................................................... 34

D.2 Load current interrupt test ..................................................................................... 34

Annex E (normative) Seal ageing test .................................................................................. 36

Annex F (normative) Identification requirements .................................................................. 38

Annex G (normative) Indelibility of markings ........................................................................ 39

Annex H (normative) Requirements for thermal-link packaged assemblies ........................... 40

Bibliography .......................................................................................................................... 43

Figure 1 – Bending/twist test ................................................................................................. 17

Figure C.1 – Typical test fixture assembly ............................................................................. 32

Figure C.2 – Typical thermal-link test oven ........................................................................... 33

Figure D.1 – Typical terminal block support test fixture ......................................................... 35

Figure E.1 – Conditioning time versus oven temperature for proposed temperature

index..................................................................................................................................... 37

Figure G.1 – Apparatus for testing durability of markings ...................................................... 39

Table 1 – Test schedule ........................................................................................................ 13

Table 2 – Strength of leads and terminal parts – Minimum required tensile and thrust

test forces ............................................................................................................................. 17

Table 3 – Creepage distances and clearances (absolute minimum values) ........................... 19

Table 4 – Test voltages for dielectric strength ....................................................................... 20

Table 5 – Test current for interrupting test ............................................................................ 21

Table 6 – Limited short-circuit test capacity .......................................................................... 23

Table H.1 – Push and pull force ............................................................................................ 41

Table H.2 – Minimum nominal cross-sectional area of conductor .......................................... 42

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SIST EN 60691:2017
– 4 – IEC 60691:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
THERMAL-LINKS –
REQUIREMENTS AND APPLICATION GUIDE
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 60691 has been prepared by subcommittee 32C: Miniature fuses,

of IEC technical committee 32: Fuses.

This fourth edition cancels and replaces the third edition published in 2002, Amendment 1:

2006 and Amendment 2: 2010. This fourth edition constitutes a technical revision.

This fourth edition includes the following significant technical changes with respect to the

previous edition:
a) requirements for thermal-link packaged assemblies;
b) renew the requirements and definitions for T -test;
c) change starting temperature for interrupt current test;
d) clarify requirements for marking (packing label);
e) minimum Proof Tracking Index 175 instead 120.
---------------------- Page: 10 ----------------------
SIST EN 60691:2017
IEC 60691:2015 © IEC 2015 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
32C/512/FDIS 32C/515/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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The basis for this standard is the harmonization of the USA national standard, UL 1020, fifth

edition (withdrawn 2003), and IEC 60691:1993, together with its Amendment 1:1995 and

Amendment 2:2000.

The following differing practices of a less permanent nature exist in the country indicated

below:
– Annex C is required to be declared in the USA;
– Annex E is required in the USA, if applicable;
– Annex F is required to be declared in the USA.
In this standard, the following type is used:
– compliance statements: in italic type.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website 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.
The contents of the corrigendum of August 2016 have been included in this copy.
---------------------- Page: 11 ----------------------
SIST EN 60691:2017
– 6 – IEC 60691:2015 © IEC 2015
INTRODUCTION

Thermal-links, defined as non-resettable devices functioning once only without refunctioning,

are widely applied for the thermal protection of equipment in which, under fault (abnormal)

conditions, one or more parts may reach hazardous temperatures.

As these devices have several aspects in common with miniature fuse-links and are used for

obtaining a comparable degree of protection, this standard has endeavoured to lay down a

number of basic requirements for such devices.
---------------------- Page: 12 ----------------------
SIST EN 60691:2017
IEC 60691:2015 © IEC 2015 – 7 –
THERMAL-LINKS –
REQUIREMENTS AND APPLICATION GUIDE
1 Scope

This International Standard is applicable to thermal-links intended for incorporation in

electrical appliances, electronic equipment and component parts thereof, normally intended

for use indoors, in order to protect them against excessive temperatures under abnormal

conditions.
NOTE 1 The equipment is not designed to generate heat.

NOTE 2 The effectiveness of the protection against excessive temperatures logically depends upon the position

and method of mounting of the thermal-link, as well as upon the current which it is carrying.

This standard may be applicable to thermal-links for use under conditions other than indoors,

provided that the climatic and other circumstances in the immediate surroundings of such

thermal-links are comparable with those in this standard.

This standard may be applicable to thermal-links in their simplest forms (e.g. melting strips or

wires), provided that molten materials expelled during function cannot adversely interfere with

the safe use of the equipment, especially in the case of hand-held or portable equipment,

irrespective of its position.

Annex H of this standard is applicable to thermal-link packaged assemblies where the

thermal-link(s) has already been approved to this standard but packaged in a metallic or non-

metallic housing and provided with terminals/wiring leads.

This standard is applicable to thermal-links with a rated voltage not exceeding 690 V a.c. or

d.c. and a rated current not exceeding 63 A.
The objectives of this standard are:
a) to establish uniform requirements for thermal-links,
b) to define methods of test,

c) to provide useful information for the application of thermal-links in equipment.

This standard is not applicable to thermal-links used under extreme conditions such as

corrosive or explosive atmospheres.

This standard is not applicable to thermal-links to be used in circuits on a.c. with a frequency

lower than 45 Hz or higher than 62 Hz.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60065:2014, Audio, video and similar electronic apparatus – Safety requirements

---------------------- Page: 13 ----------------------
SIST EN 60691:2017
– 8 – IEC 60691:2015 © IEC 2015

IEC 60112:2003, Method for the determination of the proof and the comparative tracking

indices of solid insulating materials
IEC 60112:2003/AMD1:2009
IEC 60127-2:2014, Miniature fuses – Part 2: Cartridge fuse-links

IEC 60216-5:2008, Electrical insulating materials – Thermal endurance properties – Part 5:

Determination of relative thermal endurance index (RTE) of an insulating material

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 60695-2-12:2010/AMD1:2014

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 60695-2-13:2010/AMD1:2014

IEC 60695-10-2:2014, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test

method

IEC 60695-11-10:2013, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and

vertical flame test methods
IEC 60730-1:2013, Automatic electrical controls – Part 1: General requirements

IEC 61210:2010, Connecting devices – Flat quick-connect terminations for electrical copper

conductors – Safety requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
clearance
shortest distance in air between two conductive parts
3.2
creepage distance

shortest distance along the surface of insulating material between two conductive parts

3.3
holding temperature

maximum temperature of the thermal-link at which it will not change its state of conductivity

during a specified time at the rated current
Note 1 to entry: The minimum permissible value of T is 35 °C.
3.4
homogeneous series

series of thermal-links having the same external dimensions and common overall construction,

deviating from each other only in such characteristics (including ratings) that, for a given test,

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SIST EN 60691:2017
IEC 60691:2015 © IEC 2015 – 9 –

the testing of one or a reduced number of particular thermal-links of that series shall be taken

as representative for all the thermal-links of the series
3.5
interrupting current

value of the current that the thermal-link is capable of interrupting at rated voltage and under

specified circuit conditions
3.6
maximum temperature limit

temperature of the thermal-link stated by the manufacturer, up to which the mechanical and

electrical properties of the thermal-link, having changed its state of conductivity, will not be

impaired for a given time
3.7
pilot duty
rating assigned to a switching device that controls the coil of anoth
...

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