Amendment 2 - Thermal-links - Requirements and application guide

Amendement 2 - Protecteurs thermiques - Prescriptions et guide d'application

General Information

Status
Published
Publication Date
28-Sep-2000
Technical Committee
SC 32C - Miniature fuses
Drafting Committee
WG 2 - TC 32/SC 32C/WG 2
Current Stage
DELPUB - Deleted Publication
Start Date
19-Dec-2002
Completion Date
26-Oct-2025

Relations

Effective Date
05-Sep-2023
Effective Date
05-Sep-2023

Overview

IEC 60691:1993/AMD2:2000 is the second amendment to the international standard concerning thermal-links-critical safety components used in electrical devices for overtemperature protection. Developed by the IEC Technical Committee 32C on miniature fuses, this amendment updates requirements and application guidelines for thermal-links, enhancing product safety and reliability. It addresses marking requirements, testing procedures, dielectric strength, and environmental ageing among other parameters.

This amendment ensures thermal-links comply with modern industrial demands in controlling temperature to prevent overheating hazards. With stringent testing and marking rules, IEC 60691:1993/AMD2 promotes standardized quality assurance and uniform application across electrical systems worldwide.

Key Topics

  • Marking Requirements
    Each thermal-link must be marked with the following:

    • Type or catalogue reference
    • Manufacturer’s name or trademark
    • Rated functioning temperature (Tf) with units in degrees Celsius
      Additional optional markings include rated voltage (V), rated current (A), date codes, and other relevant identifiers. Markings must be indelible and legible, verified by specific abrasion tests simulating light rubbing with water-soaked cloth or an approved apparatus to ensure lasting identification.
  • Creepage and Clearance Distances
    The amendment revises minimum clearance and creepage distances for thermal-links based on rated voltage categories, conforming to IEC 60664-1. These distances ensure insulation integrity and reduce the risk of electrical arcing or tracking in varying environmental conditions such as altitude (up to 2000 m), pollution degree, and overvoltage category.

  • Dielectric Strength and Aging Tests
    Thermal-links must uphold adequate dielectric strength even after humidity and ageing test cycles. Aging tests verify the components' functionality under sustained high temperature within ±1 K tolerance, ensuring reliability over the device’s operational life.

  • Indelibility of Marking Test Apparatus
    Annex C introduces a novel, informative apparatus for testing marking durability using a white hard buffing felt disc under controlled pressure and motion. This method provides a standardized way to assess the permanence and readability of thermal-link markings after exposure to abrasion.

Applications

IEC 60691:1993/AMD2:2000 applies to thermal-links used across various electrical and electronic equipment where overtemperature protection is essential. Key application areas include:

  • Household Appliances: Protection of electrical heating elements and motors.
  • Industrial Equipment: Thermal safeguard in control units and fuse systems.
  • Consumer Electronics: Safety cut-offs in battery packs and power supplies.
  • HVAC Systems: Overtemperature protection for compressors and fans.
  • Automotive Electrical Circuits: Integration into fuse holders and switching devices.

Compliance with this amendment ensures thermal-links meet international safety, performance, and durability standards, thus enhancing user safety and product quality globally.

Related Standards

  • IEC 60730-1:1999: Automatic electrical controls for household and similar use-Part 1: General requirements. Referenced for normative content relevant to control devices associated with thermal-links.
  • IEC 60664-1: Insulation coordination for equipment within low-voltage systems, particularly governing creepage distances and clearance requirements critical to thermal-link design.
  • Other IEC fuse standards developed by Technical Committee 32 addressing miniature and other fuse types that complement thermal protective components.

By adhering to IEC 60691:1993/AMD2:2000, manufacturers and designers ensure thermal-link devices provide reliable overtemperature protection aligned with global safety expectations, fostering safe electrical operation across numerous applications.

Standard

IEC 60691:1993/AMD2:2000 - Amendment 2 - Thermal-links - Requirements and application guide Released:9/29/2000 Isbn:2831854202

English and French language
9 pages
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Frequently Asked Questions

IEC 60691:1993/AMD2:2000 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 2 - Thermal-links - Requirements and application guide". This standard covers: Amendment 2 - Thermal-links - Requirements and application guide

Amendment 2 - Thermal-links - Requirements and application guide

IEC 60691:1993/AMD2:2000 is classified under the following ICS (International Classification for Standards) categories: 29.120.50 - Fuses and other overcurrent protection devices. The ICS classification helps identify the subject area and facilitates finding related standards.

IEC 60691:1993/AMD2:2000 has the following relationships with other standards: It is inter standard links to IEC 60691:1993, IEC 60691:2002. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

IEC 60691:1993/AMD2:2000 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
STANDARD
AMENDEMENT 2
AMENDMENT 2
2000-09
Amendement 2
Protecteurs thermiques –
Prescriptions et guide d'application
Amendment 2
Thermal-links –
Requirements and application guide

 IEC 2000 Droits de reproduction réservés  Copyright - all rights reserved
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
E
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

– 2 – 60691 amend. 2 © CEI:2000

AVANT-PROPOS
Le présent amendement a été établi par le sous-comité 32C: Coupe-circuit à fusibles

miniatures, du comité d'études 32 de la CEI: Coupe-circuit à fusibles.

Le texte de cet amendement est issu des documents suivants:

FDIS Rapport de vote
32C/247/FDIS 32C/254/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cette norme.
Le comité a décidé que le contenu de la publication de base et de ses amendements ne sera
pas modifié avant 2002. A cette date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
• amendée.
__________
Page 2
SOMMAIRE
Ajouter le titre de la nouvelle annexe C comme suit:
Annexe C (informative) Indélébilité du marquage
Page 10
2  Références normatives
Ajouter, à la liste existante, le titre de la norme suivante:
CEI 60730-1:1999, Dispositifs de commande électrique automatiques à usage domestique et
analogue – Partie 1: Règles générales
Page 20
7 Marquage
Remplacer le paragraphe 7.1 existant par le paragraphe suivant:
7.1  Chaque protecteur thermique doit porter les indications suivantes:
a) type ou référence du catalogue;
b) nom du constructeur ou marque commerciale;
c) température assignée de fonctionnement T , avec ou sans le symbole T , suivie du nombre
f f
de degrés Celsius.
60691 Amend. 2 © IEC:2000 – 3 –

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/247/FDIS 32C/254/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 the base publication and its amendments will
remain unchanged until 2002. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
__________
Page 3
CONTENTS
Add the title of the new annex C as follows:
Annex C (informative) Indelibility of marking
Page 11
2  Normative references
Add, to the existing list, the title of the following standard:
IEC 60730-1:1999, Automatic electrical controls for household and similar use – Part 1:
General requirements
Page 21
7  Marking
Replace the existing subclause 7.1 by the following:
7.1  Each thermal-link shall be marked with:
a) type or catalogue reference;
b) manufacturer's name or trade mark;
c) rated functioning temperature T , with or without the symbol T , followed by the number of
f f
degrees Celsius.
– 4 – 60691 amend. 2 © CEI:2000

La température assignée de fonctionnement T peut être omise si un type ou une référence
f
différents du catalogue sont utilisés pour chaque température différente de fonctionnement.

Là où les dimensions le permettent, des marquages complémentaires peuvent être apposés

sur le protecteur thermique, tels que la tension assignée suivie de V, le courant assigné suivi

de A, la date chiffrée, ainsi que tout autre marquage, si nécessaire.

Remplacer le paragraphe 7.2 existant par le paragraphe suivant:

7.2 Le marquage doit être indélébile et lisible.
La conformité est vérifiée par examen et en essayant d'effacer les indications en frottant
légèrement pendant 15 s avec un chiffon imbibé d'eau. Cet essai doit être répété après l'essai
de 10.2.
Après les essais de 11.4, la conformité est vérifiée par examen.
NOTE  Au lieu de «frotter légèrement», l'appareil présenté à la figure C.1 peut être utilisé.
Page 26
10.1 Lignes de fuite et distances d'isolement
Remplacer le tableau 3 existant par le nouveau tableau suivant:
Tableau 3 – Lignes de fuite et distances d'isolement
(valeurs minimales absolues)
Tension assignée U Distances d'isolement Lignes de fuite
r
mm mm
V
0 –  32 0,2 0,53
33 –  50 0,2 1,2
51 – 125 0,5 1,5
126 – 250 1,5 2,5
251 – 400 3,0 4,0
401 – 690 4,0 6,9
NOTE 1  Les distances d'isolement et les lignes de fuite sont spécifiées selon la CEI 60664-1.

NOTE 2  Les valeurs spécifiées sont applicables pour une utilisation typique des protecteurs
thermiques en supposant:
a) une contrainte continue de tension;
b) une altitude de 2 000 m;
c) une isolation principale;
d) un champ non homogène;
e) une catégorie de surtension II;
f) un degré de pollution 2;
g) un groupe de matériau IIIa.
NOTE 3  Si les conditions diffèrent de celles spécifiées à la note 2, il peut être nécessaire de
régler les lignes de fuite et les distances d'isolement selon la CEI 60664-1.

60691 Amend. 2 © IEC:2000 – 5 –

The rated functioning temperature T may be omitted if a different type or catalogue reference
f
is employed for each different functioning temperature.

Where size permits, additional markings such as rated voltage followed by V, rated current

followed by A, date co
...

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