IEC 63522-15:2024

Overview

IEC 63522-15:2024 is a crucial international standard published by the International Electrotechnical Commission (IEC) that specifies test methods for assessing the robustness of terminals in electromechanical elementary relays. This includes electromechanical relays, reed relays, reed contacts, reed switches, and their technology combinations. The standard evaluates these relays' ability to withstand stresses encountered during transportation, storage, and all normal operational uses, ensuring terminal integrity and performance reliability.

This document defines standardized test procedures that apply specific mechanical loads-such as direct axial pulls, bending, twisting, and torque stresses-to relay terminals. These tests simulate conditions relays encounter during assembly, handling, and use. The standard covers various terminal types, including screw terminals, screwless terminals, flat quick-connect terminations, and threaded terminals with nuts.

Key Topics

• Test Procedures for Relay Terminals:

  • Application of defined mechanical loads (axial pulls, bending, twisting) on terminals.
  • Torque stress testing on nuts and threaded terminals simulating assembly conditions.
  • Use of recognized IEC precedents for testing different terminal types (IEC 60999-1 for screw/screwless terminals, IEC 61210 for flat quick-connect terminations, and IEC 60068-2-21 for others).

• Sample Requirements:

  • Minimum of three relay samples tested.
  • At least three terminations of the same size and type per device under test (DUT).
  • Ensuring tests on one termination do not affect others in assembled conditions.

• Testing Conditions:

  • Devices tested in clean, new condition and mounted either as in service or according to manufacturer instructions.
  • Ambient test conditions comply with IEC 63522-0.

• Evaluation Criteria:

  • Visual inspection and dimensional verification post-test according to IEC 63522-1.
  • Measurement of coil resistance (IEC 63522-3) and contact-circuit resistance (IEC 63522-6).
  • DUTs must show no damage or malfunction; all parameters must stay within product specifications.

• Test Reporting:

  • Comprehensive documentation of the testing process, conditions, and individual device evaluations.
  • Inclusion of test method, setup, initial conditions, number of devices tested, and other relevant observations.

Applications

IEC 63522-15:2024 is highly applicable to manufacturers, designers, and quality assurance teams involved in:

• Electromechanical Relay Manufacturing
  Ensures terminals are robust and maintain electrical and mechanical integrity throughout the relay’s life cycle, meeting regulatory and safety requirements.

• Component Reliability Testing
  Provides standardized test methods to evaluate terminal durability during shipping, handling, and installation, reducing failures related to terminal deformation or loosening.

• Assembly and Maintenance Processes
  Assesses terminal torque resistance and mechanical stress tolerances experienced during assembly, promoting reliable connection integrity.

• Quality Control and Certification
  Supports compliance testing aligned with international norms, facilitating market access and customer confidence through documented robustness.

Related Standards

IEC 63522-15:2024 references and complements several other important IEC standards:

• IEC 60999-1:1999 – Safety requirements for screw-type and screwless-type clamping units used in terminals.
• IEC 61210:2010 – Safety standards for flat quick-connect terminations for electrical copper conductors.
• IEC 60068-2-21 – Environmental testing for robustness of terminations and integral mounting devices.
• IEC 63522-0 – General testing guidelines for electrical relays.
• IEC 63522-1 – Visual inspection and dimensional check for electrical relays.
• IEC 63522-3 – Test methods for relay coil properties.
• IEC 63522-6 – Measurement of contact-circuit resistance or voltage drop in relays.
• IEC 61810-1 – General and safety requirements for electromechanical elementary relays.

By integrating these standards, IEC 63522-15:2024 ensures a comprehensive approach to relay terminal testing, promoting durability, reliability, and performance consistency in electromechanical relay applications.

Keywords: IEC 63522-15, relay terminal robustness, electromechanical relays, terminal testing standards, mechanical load testing, torque stress, screw terminals, flat quick-connect terminations, relay quality assurance, IEC electrical standards.