IEC 60691:2023

Overview

IEC 60691:2023, published by the International Electrotechnical Commission (IEC), specifies the requirements and application guidelines for thermal-links. Thermal-links are non-resettable safety devices designed to protect electrical appliances, electronic equipment, and component parts against excessive temperatures due to abnormal conditions. These devices are essential for ensuring thermal protection in equipment that is not intended to generate heat during normal operation.

IEC 60691:2023 applies to thermal-links used primarily in indoor environments, but also covers other settings if similar climatic conditions exist. The standard addresses the effectiveness of thermal-link protection, which depends greatly on proper mounting and the amount of electrical current carried. This international standard is especially important for manufacturers, design engineers, and testing laboratories seeking uniform compliance and reliable safety performance for over-temperature protection components.

Key Topics

IEC 60691:2023 covers the following essential subjects:

• Scope and Purpose: Defines applicability to thermal-links in equipment for preventing damage from overheating.
• Classification: Details classification based on electrical, thermal, and material resistance conditions.
• Terminology: Provides clear definitions for technical terms such as holding temperature, rated functioning temperature, and interrupting current.
• Marking and Documentation: Stipulates requirements for labeling thermal-links and supplying critical product information.
• Constructional Requirements: Outlines standards for the mechanical strength, dielectric properties, and safety of the thermal-link design.
• Testing Methods: Specifies detailed test procedures, including tensile, thrust, bending, insulation, dielectric, and thermal cycling tests.
• Temperature Performance: Addresses tests and evaluations for rated functioning temperature, holding temperature, and ageing.
• Packaged Assemblies: Introduces requirements for thermal-links supplied in housing assemblies, with added guidance in Annex H.
• Resistance to Tracking and Rusting: Includes evaluation of insulation materials and corrosion resistance.

Applications

Thermal-links governed by IEC 60691:2023 are widely used in:

• Electrical appliances: Ensuring over-temperature protection in products such as fans, lighting fixtures, and small household appliances.
• Electronic equipment: Providing safety in consumer electronics, power supplies, and industrial control units.
• Component parts: Integrating thermal-links into subassemblies or modules where overheat protection is critical.
• Portable and hand-held devices: Safeguarding user safety in equipment that can be moved or repositioned during operation.
• Packaged assemblies: Using thermal-links in built-up assemblies for simplified installation and enhanced reliability.

The standard is indispensable for manufacturers designing compliant products, test labs conducting conformity assessment, OEMs sourcing reliable components, and certification bodies verifying product safety. Proper application of IEC 60691:2023 helps prevent electric shock, fire hazards, and equipment failure due to thermal overload.

Related Standards

For comprehensive compliance and safety, IEC 60691:2023 is frequently used together with:

• IEC 60065: Safety requirements for audio, video, and similar electronic apparatus.
• IEC 60112: Testing of the tracking index for solid insulating materials.
• IEC 60127-2: Cartridge fuse-links for miniature fuses.
• IEC 60664-1: Insulation coordination principles and tests for low-voltage equipment.
• IEC 60695 series: Fire hazard testing, including glow-wire and ball pressure tests.
• IEC 60730-1: General requirements for automatic electrical controls.
• IEC 61210: Connecting devices and safety requirements for electrical copper conductors.

Manufacturers and engineers should reference these associated standards to ensure comprehensive safety, compatibility, and quality in the design and certification of electrical and electronic products.

By adhering to IEC 60691:2023, organizations help guarantee the safety and reliability of products worldwide, maintaining essential compliance with international thermal-link requirements.