IEC 63522-36:2025

Overview

IEC 63522-36:2025 is an essential international standard developed by the International Electrotechnical Commission (IEC) for the fire hazard testing of electrical relays. This standard specifies test methods to evaluate the fire risk posed by materials used in various types of relays, ensuring they remain safe under conditions such as transportation, storage, and operational use. Electrical relays covered by this standard include electromechanical relays, reed relays, solid-state relays, and hybrid combinations.

By standardizing fire hazard assessments, IEC 63522-36:2025 helps reduce the risk of ignition and fire propagation linked to relay components, promoting safer performance in electrical and electronic devices.

Key Topics

• Scope and Coverage
  The standard applies to all electrical relays, assessing their fire hazard potential in realistic conditions including handling and typical usage.

• Fire Hazard Testing Methods
  Two primary tests are defined to measure fire risks:

  • Glow-wire Test: Simulates thermal stress from heat sources like overloaded components to assess ignition risks using heated wires at temperatures starting from 650 °C.
  • Needle Flame Test: Applies a test flame to gauge flammability and the material’s reaction to open flames.

• Test Conditions
  Specific parameters include:

  • Test temperatures selected according to product relevancy and IEC 60695 series guidelines.
  • Specimen preparation, including size and thickness based on typical relay materials.
  • Preconditioning steps following established IEC fire hazard test procedures.

• Test Points on Relays
  Testing targets critical relay areas such as the relay case near contacts and the base near contact terminals. For PCB relays, bottom-side testing is optional.

• Evaluation Criteria
  Assessment ensures that neither ignition nor sustained burning occurs, or if burning occurs, it must be limited in duration and extent without fire spread or emission of burning particles.

• Documentation
  Test reports must include detailed descriptions of procedures and results, referencing relevant IEC test methods for transparency and repeatability.

Applications

IEC 63522-36:2025 is invaluable for manufacturers, test laboratories, and safety certification bodies involved in:

• Relay Design and Manufacturing
  Ensures selection of safe materials and designs that mitigate fire risks, critical for end products in industrial automation, automotive systems, telecommunications, and consumer electronics.

• Quality Assurance and Compliance
  Helps in verifying product safety compliance with international fire safety requirements, facilitating market access and regulatory approvals.

• Risk Management in Electrical Systems
  Supports risk evaluation frameworks for systems integrating relays, contributing to safer electrical installations and reduced liability related to fire hazards.

• Research and Development
  Provides methodology for innovating materials and relay technologies with enhanced fire resistance features.

Related Standards

IEC 63522-36:2025 references key complementary IEC fire hazard testing standards including:

• IEC 60695-2-10 to IEC 60695-2-13
  Cover various glow-wire test methods, such as glow-wire apparatus, flammability tests for materials and end-products, glow-wire ignition temperatures, and flammability index determinations.

• IEC 60695-11-5
  Defines the needle flame test method, apparatus, and confirmatory test arrangements.

• IEC 63522-0
  Provides general testing guidance and definitions applicable across the IEC 63522 relay test series.

Integration with these standards ensures a harmonized framework for evaluating electrical relay safety under fire hazard conditions.

By following IEC 63522-36:2025, industry stakeholders can effectively measure and mitigate fire hazards posed by relays, thereby enhancing safety, regulatory compliance, and product reliability within electrical and electronic systems worldwide.