SIST EN IEC 60691:2024/A1:2025

Thermal-links - Requirements and application guide (IEC 60691:2023/AMD1:2024)

Temperatursicherungen - Anforderungen und Anwendungshinweise (IEC 60691:2023/AMD1:2024)

Protecteurs thermiques - Exigences et guide d'application (IEC 60691:2023/AMD1:2024)

Termični taljivi vložki - Zahteve in navodilo za uporabo - Dodatek A1 (IEC 60691:2023/AMD1:2024)

General Information

• Status: Published
• Public Enquiry End Date: 26-May-2024
• Publication Date: 04-Feb-2025
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: EVA - Fuses
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Dec-2024
• Due Date: 14-Feb-2025
• Completion Date: 05-Feb-2025
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: EN IEC 60691:2023/A1:2024 - Thermal-links - Requirements and application guide

Relations

• Amends: SIST EN IEC 60691:2024 - Thermal-links - Requirements and application guide (IEC 60691:2023)
• Effective Date: 26-Sep-2023

Overview

EN IEC 60691:2023/A1:2024 is the CENELEC-approved amendment to IEC 60691 that updates the international guidance and requirements for thermal-links (thermal fuses/thermal-links used in overcurrent and temperature protection). This amendment clarifies test current requirements, refines requirements for polymeric insulating materials and glow-wire testing, and provides enhanced test-fixture and endurance guidance for manufacturers and test laboratories.

Key benefits:

• Improves safety and repeatability of thermal-link testing
• Clarifies material and ignition-resistance expectations for housings
• Aligns test methods for a range of load types including resistive, inductive and motor locked-rotor conditions

Key Topics

• Updated test currents (Table 5): The amendment replaces the existing Table 5 with new test-current guidance covering resistive, DC, inductive, motor locked-rotor (LRA), pilot duty and electric discharge lamp conditions. Examples include AC resistive tests at 1.5× rated current and specific multipliers for motor locked-rotor and lamp inrush conditions.

• Insulating materials and GWIT: Polymeric housings for thermal-link assemblies must meet specified ratings or be tested to the relevant standards. The glow-wire ignition test (GWIT) requirement has been updated to 750 °C (IEC 60695-2-13). Epoxy or potting compounds in direct contact with live parts are exempt from some items except those explicitly retained.

• Test-fixture and endurance procedures: The amendment includes practical test-fixture instructions such as placing three specimens in series in a stabilized static-air oven, energizing with the resistive rated current for 24 h or as declared by the manufacturer, whichever is higher, and guidance for thermal monitoring using a huge mass metal block.

• Fixturing details: A recommended size for the huge mass metal block is no less than 250 mm × 110 mm × 60 mm, with a thermocouple arranged at its center. The selected wire size for tests should follow the smallest cross-sectional area specified in Table 2 of IEC 60730-1:2022.

Applications

This amendment is essential for:

• Manufacturers of thermal-links and miniature fuses
• Design engineers developing overcurrent and thermal protection
• Test laboratories performing type and routine testing
• Compliance and certification bodies in electrotechnical safety

Practical applications include improving component selection, updating test plans, and ensuring housings and assemblies meet the updated ignition-resistance and endurance expectations.

Related Standards

• IEC 60691 (base edition) - Thermal-links: requirements and application guide
• IEC 60695 series - Glow-wire and flammability testing (referenced for GWIT)
• IEC 60730-1:2022 - Appliance automatic controls (referenced for wire sizes)

For implementers, consult the full EN IEC 60691:2023/A1:2024 text for complete normative references, detailed tables and precise test procedures. Contact your national CENELEC committee for national implementation dates and transition guidance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
Termični taljivi vložki - Zahteve in navodilo za uporabo - Dodatek A1 (IEC
60691:2023/AMD1:2024)
Thermal-links - Requirements and application guide (IEC 60691:2023/AMD1:2024)
Temperatursicherungen - Anforderungen und Anwendungshinweise (IEC
60691:2023/AMD1:2024)
Protecteurs thermiques - Exigences et guide d'application (IEC 60691:2023/AMD1:2024)
Ta slovenski standard je istoveten z: EN IEC 60691:2023/A1:2024
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60691:2023/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM December 2024
ICS 29.120.50
English Version
Thermal-links - Requirements and application guide
(IEC 60691:2023/AMD1:2024)
Protecteurs thermiques - Exigences et guide d'application Temperatursicherungen - Anforderungen und
(IEC 60691:2023/AMD1:2024) Anwendungshinweise
(IEC 60691:2023/AMD1:2024)
This amendment A1 modifies the European Standard EN IEC 60691:2023; it was approved by CENELEC on 2024-12-02. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment 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 amendment 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60691:2023/A1:2024 E

European foreword
The text of document 32C/645/FDIS, future edition 5 of IEC 60691/AMD1, prepared by SC 32C
"Miniature fuses" of IEC/TC 32 "Fuses" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60691:2023/A1:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-12-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-12-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60691:2023/AMD1:2024 was approved by CENELEC as a
European Standard without any modification.

IEC 60691 ®
Edition 5.0 2024-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Thermal-links – Requirements and application guide

Protecteurs thermiques – Exigences et guide d'application

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50  ISBN 978-2-8322-9901-2

– 2 – IEC 60691:2023/AMD1:2024
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
THERMAL-LINKS –
REQUIREMENTS AND APPLICATION GUIDE

AMENDMENT 1
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
cons
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