IEC 60691:2002/AMD1:2006

Amendment 1 - Thermal-links - Requirements and application guide

Amendement 1 - Protecteurs thermiques - Prescriptions et guide d'application

General Information

• Status: Published
• Publication Date: 26-Sep-2006
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: SC 32C - Miniature fuses
• Drafting Committee: MT 9 - TC 32/SC 32C/MT 9
• Current Stage: DELPUB - Deleted Publication
• Start Date: 08-Oct-2015
• Completion Date: 26-Oct-2025

Relations

• Amends: IEC 60691:2002 - Thermal-links - Requirements and application guide
• Effective Date: 05-Sep-2023
• Revised: IEC 60691:2015 - Thermal-links - Requirements and application guide
• Effective Date: 05-Sep-2023

Overview

IEC 60691:2002/AMD1:2006 - Amendment 1 updates the international standard for thermal-links (thermal cutouts/thermal fuses), providing clarified requirements and an application guide for design, testing and marking. This amendment harmonizes parts of IEC 60691 with the former US standard UL 1020 and adds procedural, testing and documentation refinements introduced in 2006.

Key topics and requirements

• Scope & harmonization: Aligns IEC 60691 provisions with UL 1020 where applicable and updates normative references (for example IEC 60085, IEC 60112, IEC 60695 and IEC 60730-1).
• Environmental test conditions: Standard test atmosphere is specified (temperature 15–35 °C, relative humidity 25–75 %, air pressure range) with guidance to repeat tests at (23 ± 1) °C if needed.
• Sample sizes & test schedule: Typical qualification uses 45 specimens (30 in groups A–J plus 15 spares). A detailed test schedule covers marking, mechanical, electrical and temperature tests.
• Mechanical tests: Lead secureness, tensile (1 min), thrust (1 min), bending/twist (new Figure 1) - to verify mechanical integrity.
• Electrical tests: Creepage/clearance, dielectric strength, insulation resistance, resistance to tracking and interrupting current tests. Interrupting test currents use multipliers (e.g., resistive and inductive AC = 1.5× rated current; motor locked rotor ≈ 6× full-load current; pilot duty and lamp conditions specified).
• Temperature tests: Rated functioning temperature (Tf) and maximum temperature limit (Tm) procedures updated (including oven stabilization and controlled ramp rates), plus multi-step ageing tests.
• Marking & documentation: Small, non-replaceable thermal-links may be marked on packaging instead of the part. Documentation must indicate non-repairability and catalogue parameters (temperature, current, voltage).
• Manufacturer’s validation programme: Manufacturers must test three samples per temperature rating every two years for key performance items: 10.6 (interrupting current), 11.2 (rated functioning temperature) and 11.3 (maximum temperature limit), followed by dielectric and insulation tests.

Applications and users

IEC 60691 is used by:

• Thermal-link / thermal fuse manufacturers for design, production control and type testing.
• Product safety engineers and test laboratories to certify compliance for appliances and equipment containing thermal-links.
• OEMs (appliances, heating, HVAC, motors, lighting control) that integrate thermal protection devices and must meet safety and reliability requirements.
• Regulatory/compliance teams preparing technical files and documentation for market access.

Keywords: IEC 60691, thermal-links, thermal links standard, interrupting current, rated functioning temperature, manufacturer validation programme, thermal fuse testing.

Related standards

• IEC 60085 (electrical insulation – thermal classification)
• IEC 60112 (tracking indices)
• IEC 60695 series (fire hazard and abnormal heat tests)
• IEC 60730-1 (automatic electrical controls - temperature limits)
• Harmonized reference: UL 1020 (historical alignment)

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 60691
AMENDMENT 1
2006-09
Amendment 1
Thermal-links –
Requirements and application guide –

 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale M

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60691 Amend. 1  IEC:2006(E)
FOREWORD
This amendment has been prepared by subcommittee 32C: Miniature fuses, of IEC technical
committee 32: Fuses.
The text of this amendment is based on the following documents:
FDIS Report on voting
32C/395/FDIS 32C/400/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this amendment may be issued at a later date.
_____________
Page 3
CONTENTS
Add, after Clause 12, the following new Clause heading:
13 Manufacturer’s validation programme

Page 5
FOREWORD
Add the following new paragraphs 7), 8) and 9) to the first part of the Foreword:
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.

60691 Amend. 1  IEC:2006(E) – 3 –
Replace the last paragraph on page 5 by the following:
The basis for this standard is the harmonization of the USA national standard, UL 1020, fifth
edition (withdrawn 2003), and IEC 60691, second edition, together with its amendments 1
and 2.
Page 7
Replace the first paragraph by the following:
The committee has decided that the contents of this publication will remain unchanged until
)
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
A bilingual version of this amendment may be issued at a later date.
Add the following footnote to the bottom of page 7:
)
The National Committees are requested to note that for this publication the maintenance result date is 2009.

Page 13
2 Normative references
Add, after IEC 60065:2001, the following:
”Amendment 1 (2005)
Replace the reference to IEC 60085:1984, by the following:
IEC 60085:2004, Electrical insulation –Thermal classification
Replace the reference to IEC 60112 (including its footnote) by the following:
IEC 60112:2003, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
Add, after IEC 60664-1, the following:
Amendment 1 (2000)
Amendment 2 (2002)
Replace the reference to IEC 60695-10-2:1995 by the following:
IEC 60695-10-2:2003, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
Add, after IEC 60695-11-10:1999, the following:
Amendment 1 (2003)
– 4 – 60691 Amend. 1  IEC:2006(E)
Add, after IEC 60730-1:1999, the following:
Amendment 1 (2003)
Delete the reference to UL 1020:1994.
Page 15
3 Definitions
Replace the existing definition 3.7 by the following:
3.7
pilot duty
rating assigned to a switching device that controls the coil of another electro-mechanical
device such as a solenoid, relay or contactor
Page 19
5 General notes on tests
Replace the existing Clause 5 by the following:
5 General notes on tests
Unless otherwise specified, all tests shall be carried out under the following atmospheric
conditions:
Temperature: 15 °C to 35 °C
Relative humidity: 25 % to 75 %
4 5
Air pressure: 8,6 × 10 Pa to 1,06 × 10 Pa
Where the above-mentioned conditions have a significant influence, they shall be kept
substantially constant during the tests.
If the temperature limits given in this clause are too wide for certain tests, these shall be
repeated, in case of doubt, at a temperature of (23 ± 1) °C.
In every test report, the ambient temperature shall be stated. If the standard conditions for
relative humidity or pressure are not fulfilled during the tests, a note to this affect shall be
added to the report.
If the result of a test is influenced, to an appreciate extent, by the position and method of
mounting of the specimen, the most unfavourable condition shall be chosen for the relevant
tests and recorded.
If a thermal-link has been specifically designed for use in a special type of equipment and
cannot be tested separately, the tests of this standard shall be performed in that equipment or
in the relevant part of it, or similar.
When testing a homogeneous series of thermal-links, all the tests shall be applied to thermal-
links with the lowest and highest T. Thermal-links with intermediate rated functioning
f
temperatures need only be subjected to tests according to 10.6, 11.2, 11.3 and 11.4.

60691 Amend. 1  IEC:2006(E) – 5 –
The total number of specimens required is 45. Out of a total of 45 specimens, 15 are kept as
spares in case some of the tests have to be repeated. Out of a total of 45 specimens, 30 are
divided into groups assigned an alphabetical letter from A to J. Each group consists of three
specimens. In general, tests shall be performed in the order indicated in Table 1 but, if so
required, tests may be repeated, for example the test on marking (see Clause 7). Additional
samples may be needed according to Note 2 of Table 1.
NOTE 1 For optional tests, additional samples will be required per the annexes.
If, in any of the tests carried out in accordance with any clause, a failure is reported, the
cause of the failure will be identified and corrective action taken. Based on the failure analysis
report and the corrective action, at a minimum, that test sequence shall be repeated on twice
the number of revised specimens and no further failures are allowed.
The conductive heat ageing test of Annex C is applicable when declared by the manufacturer.
Exception: The conductive heat ageing test may be omitted if the thermal-link is constructed
without contacts.
NOTE 2 In the USA the conductive heat ageing test is required to be declared.

– 6 – 60691 Amend. 1  IEC:2006(E)
Table 1 – Test schedule
Specimen groups
Clause or
Test
subclause
A B C D E F G H I J
7* Marking (rub test) X X
9 Mechanical requirements
9.2* Tensile force X
9.3* Thrust force X
9.4* Bending/twist force  X
10 Electrical requirements
10.1* Creepage distances and clearances   X X
10.2* Temperature and humidity cycle conditioning X X X  X X
12* Resistance to rusting (ferrous parts only) X X X
10.3* Dielectric strength (if applicable) X X X  X X
10.4* Insulation resistance (if applicable) X X X  X X
10.5* Resistance to tracking  X X
10.6 Interrupting current   X X
10.7* Transient overload current X X   X
11 Temperature tests
11.2 Check on T X X
f
11.3 Check on T followed by dielectric test and  X X
m
insulation resistance
11.4 Ageing X  X  X X X
step 1 (optional) 21 days
step 2 (mandatory) 21 days
step 3 (mandatory) 14 days
step 4 (mandatory) 7 days
step 5 (mandatory) 7 days
step 6 (mandatory) 24 h
10.3 Dielectric strength X X  X X X X X X
10.4 Insulation resistance X X  X X X X X X
7* Marking (visual inspection only) X X
NOTE 1 For homogeneous series, tests marked with an asterisk may be omitted for intermediate ratings.
NOTE 2 If the conditions of voltage, power and current in c), d) and e) of 10.6.2 are not covered by one test,
a minimum of three samples should be tested for each condition.

Page 23
7 Marking
Replace, on page 25, the penultimate paragraph of Cla
...

IEC 60691 ®
Edition 3.0 2006-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Thermal-links – Requirements and application guide

Protecteurs thermiques – Prescriptions et guide d'application

IEC 60691:2002-12/AMD1:2006-09(en-fr)

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IEC 60691 ®
Edition 3.0 2006-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Thermal-links – Requirements and application guide

Protecteurs thermiques – Prescriptions et guide d'application

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-2192-1

– 2 – IEC 60691:2002/AMD1:2006
© IEC 2006
FOREWORD
This amendment has been prepared by subcommittee 32C: Miniature fuses, of IEC technical
committee 32: Fuses.
This bilingual version (2015-01) corresponds to the English version, published in 2006-09.
The text of this amendment is based on the following documents:
FDIS Report on voting
32C/395/FDIS 32C/400/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The French version of this amendment has not been vote upon.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
Page 3
CONTENTS
Add, after Clause 12, the following new Clause heading:
13 Manufacturer’s validation programme

Page 5
FOREWORD
Add the following new paragraphs 7), 8) and 9) to the first part of the Foreword:
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.

© IEC 2006
Replace the last paragraph on page 5 by the following:
The basis for this standard is the harmonization of the USA national standard, UL 1020, fifth
edition (withdrawn 2003), and IEC 60691, second edition, together with its amendments 1
and 2.
Page 7
Replace the first paragraph by the following:
The committee has decided that the contents of this publication will remain unchanged until
)
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
A bilingual version of this amendment may be issued at a later date.
Add the following footnote to the bottom of page 7:
)
The National Committees are requested to note that for this publication the maintenance result date is 2009.

Page 13
2 Normative references
Add, after IEC 60065:2001, the following:
Amendment 1 (2005)
Replace the reference to IEC 60085:1984, by the following:
IEC 60085:2004, Electrical insulation –Thermal classification
Replace the reference to IEC 60112 (including its footnote) by the following:
IEC 60112:2003, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
Add, after IEC 60664-1, the following:
Amendment 1 (2000)
Amendment 2 (2002)
Replace the reference to IEC 60695-10-2:1995 by the following:
IEC 60695-10-2:2003, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
Add, after IEC 60695-11-10:1999, the following:
Amendment 1 (2003)
– 4 – IEC 60691:2002/AMD1:2006
© IEC 2006
Add, after IEC 60730-1:1999, the following:
Amendment 1 (2003)
Delete the reference to UL 1020:1994.
Page 15
3 Definitions
Replace the existing definition 3.7 by the following:
3.7
pilot duty
rating assigned to a switching device that controls the coil of another electro-mechanical
device such as a solenoid, relay or contactor
Page 19
5 General notes on tests
Replace the existing Clause 5 by the following:
5 General notes on tests
Unless otherwise specified, all tests shall be carried out under the following atmospheric
conditions:
Temperature: 15 °C to 35 °C
Relative humidity: 25 % to 75 %
4 5
Air pressure: 8,6 × 10 Pa to 1,06 × 10 Pa
Where the above-mentioned conditions have a significant influence, they shall be kept
substantially constant during the tests.
If the temperature limits given in this clause are too wide for certain tests, these shall be
repeated, in case of doubt, at a temperature of (23 ± 1) °C.
In every test report, the ambient temperature shall be stated. If the standard conditions for
relative humidity or pressure are not fulfilled during the tests, a note to this affect shall be
added to the report.
If the result of a test is influenced, to an appreciate extent, by the position and method of
mounting of the specimen, the most unfavourable condition shall be chosen for the relevant
tests and recorded.
If a thermal-link has been specifically designed for use in a special type of equipment and
cannot be tested separately, the tests of this standard shall be performed in that equipment or
in the relevant part of it, or similar.
When testing a homogeneous series of thermal-links, all the tests shall be applied to thermal-
links with the lowest and highest T. Thermal-links with intermediate rated functioning
f
temperatures need only be subjected to tests according to 10.6, 11.2, 11.3 and 11.4.

© IEC 2006
The total number of specimens required is 45. Out of a total of 45 specimens, 15 are kept as
spares in case some of the tests have to be repeated. Out of a total of 45 specimens, 30 are
divided into groups assigned an alphabetical letter from A to J. Each group consists of three
specimens. In general, tests shall be performed in the order indicated in Table 1 but, if so
required, tests may be repeated, for example the test on marking (see Clause 7). Additional
samples may be needed according to Note 2 of Table 1.
NOTE 1 For optional tests, additional samples will be required per the annexes.
If, in any of the tests carried out in accordance with any clause, a failure is reported, the
cause of the failure will be identified and corrective action taken. Based on the failure analysis
report and the corrective action, at a minimum, that test sequence shall be repeated on twice
the number of revised specimens and no further failures are allowed.
The conductive heat ageing test of Annex C is applicable when declared by the manufacturer.
Exception: The conductive heat ageing test may be omitted if the thermal-link is constructed
without contacts.
NOTE 2 In the USA the conductive heat ageing test is required to be declared.

– 6 – IEC 60691:2002/AMD1:2006
© IEC 2006
Table 1 – Test schedule
Specimen groups
Clause or
Test
subclause
A B C D E F G H I J
7* Marking (rub test) X X
9 Mechanical requirements
9.2* Tensile force X
9.3* Thrust force X
9.4* Bending/twist force  X
10 Electrical requirements
10.1* Creepage distances and clearances   X X
10.2* Temperature and humidity cycle conditioning X X X  X X
12* Resistance to rusting (ferrous parts only) X X X
10.3* Dielectric strength (if applicable) X X X  X X
10.4* Insulation resistance (if applicable) X X X  X X
10.5* Resistance to tracking  X X
10.6 Interrupting current   X X
10.7* Transient overload current X X   X
11 Temperature tests
11.2 Check on T X X
f
11.3 Check on T followed by dielectric test and  X X
m
insulation resistance
11.4 Ageing X  X  X X X
step 1 (optional) 21 days
step 2 (mandatory) 21 days
step 3 (mandatory) 14 days
step 4 (mandatory) 7 days
step 5 (mandatory) 7 days
step 6 (mandatory) 24 h
10.3 Dielectric strength X X  X X X X X X
10.4 Insulation resistance X X  X X X X X X
7* Marking (visual inspection only) X X
NOTE 1 For homogeneous series, tests marked with an asterisk may be omitted for intermediate ratings.
NOTE 2 If the conditions of voltage, power and current in c), d) and e) of 10.6.2 are not covered by one test,
a minimum of three samples should be tested for each condition.

Page 23
7 Marking
Replace, on page 25, the penultimate paragraph of Clause 7 (which starts with “The marking
in accordance with a), b), c) etc.)“ by the following:
If the thermal-link is small in size, and not intended to be replaced, the markings in
accordance with a), b), c) and d) above shall be printed on the packaging, together with a
reference to this standard.
© IEC 2006
Page 25
8 Documentation
Delete all three NOTES in this Clause.
Add the following new item e):
e) thermal-links small in size and not intended to be replaced.
NOTE 1 In order to avoid possible damage to the thermal-link, the manufacturer should be consulted when
the end-use application involves sealing in or the use of cleaning solvents.
NOTE 2 For reasons of safety, it should be made clear in the documentation that a thermal-link is a non-
repairable item and that, in case of replacement, an equivalent thermal-link from the same manufacturer and
having the same catalogue reference should be used, mounted in exactly the same way.
NOTE 3 Catalogue or reference numbers should define those parameters such as temperature, current and
voltage, which together classify a thermal-link.

Page 25
9 Mechanical requirements
Replace, on page 27, the fifth paragraph of Clause 9 by the following:
For current-carrying parts, temperature limits should be considered according to Table 14.1 of
IEC 60730-1.
Page 29
9.1 Lead secureness tests
Delete the last paragraph.
9.2 Tensile test
Replace “10 min” by “1 min”.
9.3 Thrust test
Replace “10 min” by “1 min”.
90°
– 8 – IEC 60691:2002/AMD1:2006
© IEC 2006
Page 31
9.4 Bending/twist test
Replace the existing Figure 1 by the following new Figure 1:
Thermal-link
rigidly supported
10 mm
Step 1: Bend
180°
Step 2: Twist
IEC  2769/02
Page 33
10 Electrical requirements
Insert, before Notes 1 and 2, the following new text:
If it is necessary to investigate an insulating material, the following standards shall be used :
IEC 60085, IEC 60216-1, IEC 60695-2-11, IEC 60695-10-2, IEC 60695-10-3, IEC 60695-11-
10 and IEC 60695-11-20.
Exception: Seals and potting compounds not relied upon for contact alignment or secureness of leads may be
subjected to the seal ageing test specified in Annex E.

© IEC 2006
Page 33
10.1 Creepage distances and clearances
Delete all text from the fourth paragraph inclusive, up to Table 3.

Page 35
10.2 Humidity conditioning
Replace, in the second sentence, “of 10.2.1 and 10.2.2 below” by “specified below”.
Add the following new text:
For temperature and humidity cycle conditioning, the thermal-link samples shall be subjected
to three complete conditioning cycles. Each cycle shall consist of 24 h at T followed
h
immediately (within 15 min) by at least 24 h at (35 ± 5) °C and (90 ± 5) % relative humidity,
followed by 8 h at (0 ± 2) °C.
NOTE The dielectric and insulation resistance tests are performed after removal of the samples from the
conditioning chamber.
Page 37
Delete the title and text of both 10.2.1 and 10.2.2.

Page 39
10.5 Resistance to tracking
Delete, after the first two paragraphs, the remaining text in this subclause (where it begins “In
order to determine … etc.)”.
– 10 – IEC 60691:2002/AMD1:2006
© IEC 2006
Page 41
10.6 Interrupting current
10.6.2 Specific conditions
Replace the existing Table 5 by the following new Table 5:
Table 5 – Test current for interrupting test
Type of rating Rated in Test current Power factor
Resistive AC amperes 1,5 times rated current 0,95 – 1,0
Inductive AC amperes 1,5 times rated current 0,6
DC amperes Current --
Motor AC locked rotor 6 times full-load current * 0,4 – 0,5
Amperes (LRA)
DC amperes 10 times full-load current --
Pilot duty AC volt-amperes 10 times VA 0,35
Electric discharge lamp AC amperes 4 times rated current 0,4 – 0,5
* Or the specified value, such as horsepower, if locked rotor ampere rating is omitted.

Replace, on page 43, the existing item g) by the following new item g):
g) Compliance is checked by the following test. For thermal-links rated 249 °C or lower, the
sample shall be placed in a test oven, stabilized at a temperature of T – 12 K or as
f
declared by the manufacturer, but not higher than 2 K below the lowest tolerance. For
thermal-links rated at 250 °C or higher, and a tolerance of T , the sample shall be
f
−20
placed in a test oven, stabilized at a temperature of T – 22 K, or as declared by the
f
manufacturer, but not higher than 2 K below the lowest tolerance. The temperature of the
oven shall then re-stabilize. All thermal links, rated 249 °C or lower, and 250 °C or higher,
shall then be energized and the oven temperature increased at the rate of (2 ± 1) K/min
and the test shall be continued until the thermal-link functions or the oven temperature
reaches 30 K above T .
f
NOTE 1 The thermal-link may operate immediately after being energized, in which case the temperature
increase of (2 + 1) K is not necessary and the test may be stopped.

Add the following new note at the end of 10.6.2:
NOTE 2 The main purpose of this test is to evaluate the mechanical and electrical integrity of the thermal-link to
interrupt a certain load.
Page 45
10.8.2 Method
Replace, in line 8, “. of the appropriate size.” by “. having a cross-sectional area as indicated
in Table 10.2.1 of IEC 60730-1.”

© IEC 2006
Page 47
11.2 Rated functioning temperature, T
f
Replace the existing subclause by the following:
Thermal-links shall be exposed, in the test oven or oil bath, to T – 12 K or as declared by the
f
manufacturer but not higher than 2 K below the lowest tolerance for devices rated less than
250 °C, until the temperature has stabilized shown when two consecutive readings taken
5 min apart are within 1 K of each other. For devices rated 250 °C or higher, the thermal-links
shall be exposed to T – 22 K, or as declared by the manufacturer, but not higher than 2 K
f
below the lowest tolerance. The temperature shall then be stabilized, shown when two
consecutive readings taken 5 min apart are within 1 K of each other. The temperature shall
then be increased steadily with a rate of rise between 0,5 K/min to 1 K/min, until all
specimens have functioned. The individual functioning temperature of thermal-links, rated less
than 250 °C, shall be recorded and they shall be not less than as declared by the
manufacturer, or T – 10 K if no declaration is made. For thermal-links rated at 250 °C or
f
higher, the recorded temperature shall be not less than that declared by the manufacturer, or
T – 20 K if no declaration is made. For thermal-links rated lower than 250 °C, or higher than
f
250 °C, the temperature shall not be greater than T .
f
NOTE The equipment recommended for the tests of 11.2 is shown in Clause C.6.

Page 49
11.3 Maximum temperature limit, T
m
Replace the first paragraph of 11.3 by the following:
The specimens shall be subjected to T °C for a period of 10 min. With the samples
m
−5
maintained at T °C, a dielectric test per 10.3, and an insulation resistance test per 10.4,
m
−5
shall be conducted.
...