IEC 63522-21:2025 PDF

Name: IEC 63522-21:2025 — Electrical relays - Tests and measurements - Part 21: Thermal endurance
SKU: IEC 63522-21:2025
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Electrical relays - Tests and measurements - Part 21: Thermal endurance

Название (английский):

IEC 63522-21:2025

Electrical relays - Tests and measurements - Part 21: Thermal endurance

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 11 августа 2025 г.
Издание:: IEC IS 63522 edition 1 version 1
ICS:: 29.120.70

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Описание (английский):

IEC 63522-21:2025 This part is used for testing along with the appropriate severities and conditions for measurements and tests designed to assess the ability of DUTs to perform under expected conditions of transportation, storage and all aspects of operational use. This document defines a standard test method for evaluation of resistance against high temperature for long periods.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

IEC 63522-21:2025 - "Electrical relays - Tests and measurements - Part 21: Thermal endurance" defines a standardized test method to evaluate the resistance of electrical relays to prolonged high-temperature exposure. The standard is intended to assess relay performance under expected conditions of transportation, storage and operational use, with relays energized at rated coil voltage and carrying specified continuous currents. The preferred test duration is 1 000 h, extendable to 2 000 h and 5 000 h depending on results.

Key topics and requirements

Purpose: Verify that relays continue to operate correctly (operate/release at specified voltages) after long periods at the upper value of their operating temperature range while energized.

Test durations (duration levels): Recommended intermediate checks at 72 h, 200 h, 500 h; final measurements at 1 000 h (level A), 2 000 h (level B) and 5 000 h (level C).

Conditions to be specified: mounting method (PCB, PWB, flat-quick connectors, sockets), mounting distance, maximum ambient temperature (chamber with air recirculation), energization (rated coil voltage), and load (limiting continuous current).

Sample size: minimum 5 pieces (5–10 recommended).

Measurements and evaluations:

Intermediate functional checks per IEC 63522-7 (functional tests).
Final checks include contact-circuit resistance per IEC 63522-6 and timing per IEC 63522-8.
Pass criteria: correct switching at operating and release voltages after cooldown to ambient temperature; no malfunction during final functional cycles.

Reporting: A detailed test report must record DUT description, method, deviations, ambient conditions, voltages/currents, duty cycle, mounting, limiting currents and all observations (see Table 3 of the standard).

Practical applications and users

Who uses it: relay manufacturers, component qualification and reliability labs, quality assurance engineers, design and test engineers, and certification bodies.

Why it matters: Thermal endurance testing verifies long-term reliability of relays in high-temperature environments - crucial for industrial control systems, power distribution, automotive control modules, and other applications where relays remain energized under elevated temperatures.

Benefits: Helps prevent contact failures, high contact resistance and timing drift; informs design choices (materials, cooling, mounting) and supports product claims about thermal lifetime and operational robustness.

Related standards

IEC 63522-0: General testing guidance

IEC 63522-6: Contact-circuit resistance (voltage drop)

IEC 63522-7: Functional tests

IEC 63522-8: Timing tests

IEC 63522-22: Limiting continuous current

Keywords: IEC 63522-21, thermal endurance, electrical relays, high temperature testing, relay qualification, contact resistance, limiting continuous current, operating voltage, release voltage, test duration.

IEC 63522-21:2025 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Practical applications and users

Related standards

Технические детали

BS EN IEC 63522-7:2025

Electrical relays. Tests and measurements - Functional tests

BS EN IEC 63522-6:2025

Electrical relays. Tests and measurements - Contact-circuit resistance or voltage drop

BS EN IEC 63522-8:2024

Electrical relays. Tests and measurements - Timing

BS EN IEC 63522-22:2025

Electrical relays. Tests and measurements - Limiting continuous current

BS EN IEC 63522-21:2025

Electrical relays. Tests and measurements - Thermal endurance