EN 60691:2003

SLOVENSKI STANDARD
01-marec-2004
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SIST EN 60691:1998
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Thermal-links - Requirements and application guide
Temperatursicherungen - Anforderungen und Anwendungshinweise
Protecteurs thermiques - Prescriptions et guide d'application
Ta slovenski standard je istoveten z: EN 60691:2003
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Troisième édition
STANDARD
Third edition
2002-12
Protecteurs thermiques –
Prescriptions et guide d'application
Thermal-links –
Requirements and application guide
 IEC 2002 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
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Commission Electrotechnique Internationale PRICE CODE
International Electrotechnical Commission
Международная Электротехническая Комиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

60691  IEC:2002 – 3 –
CONTENTS
FOREWORD . 5
INTRODUCTION .9
1 Scope .11
2 Normative references.13
3 Definitions .15
4 General requirements .17
5 General notes on tests.19
6 Classification .23
7 Marking .23
8 Documentation.25
9 Mechanical requirements .25
10 Electrical requirements .33
11 Temperature tests.47
12 Resistance to rusting .49
Annex A (normative) Application guide.53
Annex B (normative) Alternative ageing test for thermal-links with T
h
greater than 250 °C for use in electric irons .55
Annex C (normative) Conductive heat ageing test .57
Annex D (informative) Extended holding temperature evaluation .67
Annex E (normative) Seal ageing test .71
Annex F (normative) Identification requirements.75
Annex G (informative) Indelibility of markings .77
Figure 1 – Bending/twist test .31
Figure C.1 – Typical test fixture assembly .63
Figure C.2 – Typical thermal-link test oven.65
Figure D.1 – Typical terminal block support test fixture .69
Figure E.1 – Conditioning time versus oven temperature for proposed temperature index .73
Figure G.1 – Apparatus for testing durability of markings .77
Table 1 – Test schedule .21
Table 2 – Strength of terminals – Minimum required tensile and thrust test forces.33
Table 3 – Creepage distances and clearances (absolute minimum values).35
Table 4 – Test voltages for dielectric strength .37
Table 5 – Test current for interrupting test.41
Table 6 – Limited short-circuit test capacity.45

60691  IEC:2002 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
THERMAL-LINKS –
REQUIREMENTS AND APPLICATION GUIDE
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The 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 third edition cancels and replaces the second edition published in 1993, its amendment 1
(1995) and its amendment 2 (2000). This third edition constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
32C/321/FDIS 32C/329/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 US national standard UL 1020 (fifth edition) which deals with thermal cutoffs/thermal-
links, has served as a basis for the elaboration of this new edition.

60691  IEC:2002 – 7 –
The committee has decided that the contents of this publication will remain unchanged until
2005. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60691  IEC:2002 – 9 –
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 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.

60691  IEC:2002 – 11 –
THERMAL-LINKS –
REQUIREMENTS AND APPLICATION GUIDE
1 Scope and object
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 need not be 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.
NOTE 3 Attention is drawn to the fact that the external creepage distances and clearances specified in Table 3
may in some cases be smaller than those required by certain appliance or equipment standards. In such cases,
additional means should be provided when a thermal-link is mounted in the equipment in order to adjust the
creepage distances and clearances to the values required by the relevant equipment standard.
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.
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 object of this standard is
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.

60691  IEC:2002 – 13 –
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60065:2001, Audio, video and similar electronic apparatus – Safety requirements
IEC 60085:1984, Thermal evaluation and classification of electrical insulation
IEC 60112, Method for determining the comparative and the proof tracking indices of solid
insulating materials under moist conditions
IEC 60216-1:2001, Electrical insulating materials – Properties of thermal endurance – Part 1:
Ageing procedures and evaluation of test results
IEC 60664-1:1992, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-11:2000, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products
IEC 60695-10-2:1995, Fire hazard testing – Part 10-2: Guidance and test methods for the
minimization of the effects of abnormal heat on electrotechnical products involved in fires –
Method for testing products made from non-metallic materials for resistance to heat using the
ball pressure test
IEC 60695-10-3:2002, Fire hazard testing – Part 10-3: Abnormal heat – Mould stress relief
distortion test
IEC 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
IEC 60695-11-20:1999, Fire hazard testing – Part 11-20: Test flames – 500 W flame test
methods
IEC 60730-1:1999, Automatic electrical controls for household and similar use – Part 1:
General requirements
IEC 61210:1993, Connecting devices – Flat quick-connect terminations for electrical copper
conductors – Safety requirements
UL 1020:1994, Thermal Cutoffs for Use in Electrical Appliances and Components
———————
A fourth edition of IEC 60112, due to be published in 2003, is being prepared.

60691  I
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