EN IEC 60691:2023/A2:2026

Overview

EN IEC 60691:2023/A2:2026, published by CLC, is a key international standard providing requirements and guidance for thermal-links. Thermal-links are non-resettable protective devices designed to interrupt an electrical circuit when a specified temperature is exceeded, thereby preventing overheating and potential hazards in electrical and electronic equipment. This amendment to the base standard focuses on updated requirements and enhanced application guidance, supporting the reliable integration of thermal-links in various industries.

Key Topics

• Definition and Purpose: Clearly outlines what constitutes a thermal-link and its role in circuit protection by disconnecting when predetermined temperature thresholds are reached.
• Holding Temperature Testing: Details procedures for verifying the holding temperature of thermal-links, emphasizing accuracy and consistency in test environments to ensure product reliability.
• Test Equipment and Setup: Specifies requirements for test fixtures, oven temperature uniformity, and the use of fine wire thermocouples or equivalent methods for reliable temperature measurements.
• Installation and Integration: Offers guidance on securing specimens, electrical isolation, proper wire selection, and prevention of heat sink effects that could influence performance.
• Verification and Compliance: Describes compliance criteria, such as ensuring the thermal-link maintains continuity after the holding temperature test if it remains within its designed limits.

Applications

Thermal-links covered under EN IEC 60691:2023/A2:2026 are widely used to enhance the safety and reliability of electrical products in many sectors, including:

• Consumer Electronics: Used in appliances such as hair dryers, coffee makers, and heaters to prevent overheating.
• Industrial Equipment: Incorporated into motor windings, transformers, and power supplies to avoid costly damage or safety incidents.
• Automotive Systems: Serve as crucial protection in battery packs, wiring harnesses, and electronic control modules.
• Lighting Fixtures: Safeguard against excessive heat in lamps and luminaires, prolonging lifespan and maintaining safety.
• Battery Packs: Ensure protection for rechargeable batteries in tools, personal devices, and backup systems.

Proper specification and application of thermal-links, as guided by this standard, directly impact product safety, regulatory compliance, and market acceptance. The inclusion of updated Annexes and test procedures enables manufacturers to demonstrate compliance and uphold robust quality management systems.

Related Standards

Stakeholders working with EN IEC 60691:2023/A2:2026 may also benefit from familiarity with the following related standards:

• IEC 60691: The base standard outlining general requirements and testing for non-resettable thermal-links.
• IEC 60127 Series: Standards for miniature fuses, often used alongside thermal-links for complete circuit protection.
• IEC 60730: Standards governing automatic electrical controls for household and similar use.
• EN 60695 Series: Standards covering the fire hazard testing of electrical equipment.

Understanding and implementing EN IEC 60691:2023/A2:2026 strengthens product development, protects consumers, and facilitates market access across regions. Compliance with these evolving thermal-link requirements is essential for organizations committed to safety and global standards in electrical engineering.