EN IEC 63522-28:2025

• Abstract:

  IEC 63522-28:2025 This part of IEC 63522 is used for testing all kinds of electrical relays and for evaluating their ability to perform under expected conditions of transportation, storage and all aspects of operational use. This document defines a standard test method for thermoelectric electromotive force (e.m.f.).

• Status: Published
• Publication Date: 05-Jun-2025
• ICS: 29.120.70 - Relays
• Technical Committee: CLC/SR 94 - All-or-nothing electrical relays
• Drafting Committee: IEC/TC 94 - IEC_TC_94
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 06-Jun-2025
• Due Date: 01-Sep-2023
• Completion Date: 06-Jun-2025
• Ref Project: SIST EN IEC 63522-28:2025 - Electrical relays - Tests and measurement - Part 28: Thermoelectric electromotive force (e.m.f.)

• Refers: FprEN IEC 63522-0:2026 - Electrical relays - Tests and measurements - Part 0: General and guidance
• Effective Date: 03-Feb-2026

Overview

EN IEC 63522-28:2025 is a European Standard developed by CLC and based on IEC 63522-28:2025. It details a standardized test method for evaluating the thermoelectric electromotive force (e.m.f.) in electrical relays. This standard applies to a wide variety of relay types, including electromechanical relays, reed relays, solid-state relays, time relays, and combinations of these technologies. The document is integral for assessing a relay’s performance and reliability under conditions expected during storage, transport, and operational use.

Adherence to this standard ensures consistency and reliability across testing laboratories, providing confidence in the quality and safety of electrical relays within the supply chain.

Key Topics

• Standard Test Method: EN IEC 63522-28:2025 defines a repeatable procedure for measuring thermoelectric e.m.f., focusing on the potential voltage generated by relay contacts due to temperature differences and the use of unlike metals.
• Scope of Application: Applies to all types of electrical relays, including:
  • Electromechanical relays
  • Reed relays
  • Reed contacts and switches
  • Solid-state relays
  • Time relays and technology combinations
• Test Procedure and Conditions:
  • Relays are subjected to temperatures near their maximum permissible limits, with terminals soldered to specific bare copper wires.
  • After thermal equilibrium is achieved, the voltage (e.m.f.) is measured to verify it does not exceed specified limits.
  • Essential test conditions to be specified include the soldering method/materials, ambient temperature, and acceptable e.m.f. limits.
• Reporting Requirements:
  • Test results, methods, ambient conditions, and measured values must be thoroughly documented.
  • If the test is part of another standard’s assessment, results must integrate accordingly; otherwise, a dedicated test report is recommended.

Applications

EN IEC 63522-28:2025 is crucial for any manufacturer, testing laboratory, or end user involved with the quality and reliability assessment of electrical relays. Typical applications include:

• Product Qualification and Compliance: Ensuring relays meet industry safety and operational requirements during certification processes.
• Quality Assurance: Supporting ongoing quality control by providing a standardized framework for measuring thermoelectric e.m.f. during manufacturing and final inspection.
• Research and Development: Serving as a reference for R&D teams in the selection of materials or design validation to minimize unwanted e.m.f. effects in high-reliability applications.
• Failure Analysis: Facilitating root cause investigations when unwanted voltages or performance degradation is suspected due to thermoelectric effects.

By specifying clear test methodologies, EN IEC 63522-28:2025 helps organizations consistently assess relay performance and maintain product safety standards, thus supporting reliable operation in a broad range of electrical and electromechanical systems.

Related Standards

Implementing EN IEC 63522-28:2025 often requires consideration of other related standards, such as:

• IEC 63522-0: Electrical relays – Tests and measurements – Part 0: General and guidance (provides foundational test definitions and methods).
• Additional IEC and EN standards relevant to relay design, performance, and safety.
• ICS 29.120.70: Classification covering relays.

For the most up-to-date and harmonized approach to relay testing and electromotive force measurement, it is advisable to consult the latest revisions of these related standards.

Keywords: EN IEC 63522-28:2025, electrical relays, thermoelectric electromotive force, e.m.f., relay testing, CLC standard, relay performance, relay measurement, product compliance, quality standards.