IEC 63522-48:2024

Electrical relays - Tests and measurements - Part 48: Contact failure rate test

IEC 63522-48:2024 is used for for testing electromechanical elementary relays (electromechanical relays, reed relays, reed contacts, reed switches and technology combinations of these) 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 contact failure rate test of electromechanical elementary relays applied to low-load applications (e.g., CC 0, CC 1) and failure rates and failure rate levels at low loads under specified conditions.

Relais électriques - Essais et mesurages - Partie 48 : Essai de taux de défaillance des contacts

Le IEC 63522-48:2024 traite des essais des relais électromécaniques élémentaires (relais électromécaniques, relais à lames souples, contacts à lames souples, interrupteurs à lames souples et combinaisons de ces technologies) et évalue leur aptitude à fonctionner dans des conditions prévues de transport, de stockage, et tous les aspects de leur utilisation opérationnelle.
Le présent document définit une méthode d’essai normalisée pour l'essai de taux de défaillance des contacts des relais électromécaniques élémentaires dans le cas d'applications à faible charge (par exemple, CC 0, CC 1) et de taux de défaillance et de niveaux de taux de défaillance à faibles charges dans des conditions spécifiées.

General Information

• Status: Published
• Publication Date: 04-Dec-2024
• ICS: 29.120.70 - Relays
• Technical Committee: TC 94 - Electrical relays
• Drafting Committee: WG 3 - TC 94/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 06-Dec-2024
• Completion Date: 05-Dec-2024

Standards Content (Sample)

IEC 63522-48 ®
Edition 1.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 48: Contact failure rate test

Relais électriques – Essais et mesurages –
Partie 48 : Essai de taux de défaillance des contacts
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IEC 63522-48 ®
Edition 1.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 48: Contact failure rate test

Relais électriques – Essais et mesurages –

Partie 48 : Essai de taux de défaillance des contacts

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0061-7

– 2 – IEC 63522-48:2024 © IEC 2024
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Terms and definitions related to failure rate . 7
3.2 Terms and definitions related to conditions and operations . 8
3.3 Terms and definitions related to contact faults . 8
4 Test procedure . 8
4.1 Purpose . 8
4.2 Procedure . 8
4.2.1 General . 8
4.2.2 Test circuit . 9
4.2.3 Contact load . 9
4.2.4 Test cycle . 10
4.2.5 Method 1: Continuous monitoring . 10
4.2.6 Method 2: Intermediate monitoring . 11
4.3 Conditions to be specified . 11
5 Evaluation . 12
5.1 General . 12
5.1.1 Acceptance criteria . 12
5.1.2 Final tests (if applicable) . 12
5.1.3 Visual inspection (if applicable) . 12
5.2 Test report . 13
Annex A (informative) Test procedures for electromechanical elementary relays . 14
Annex B (normative) Test procedures for particular reed switch (reed contact) types
and similar products . 16
Annex C (normative) Test circuits for contact failure rate test . 18
C.1 Test circuit with monitoring equipment using relays . 18
C.2 Test circuit with monitoring equipment using a monitoring device with
capability of storing measurement results . 19
C.3 ON check and OFF check timing portion . 19
Annex D (normative) Assessment of test results . 20
D.1 General . 20
D.2 Calculation of upper limit value of failure rate. 20
D.3 Calculation of total number of operations . 21
D.4 Failure rate level . 22
Annex E (informative) Practical example . 24
E.1 Purpose . 24
E.2 Basic assumptions . 24
E.3 Example. 24
Bibliography . 26

Figure C.1 – Test circuit with monitoring equipment using relays . 18
Figure C.2 – Test circuit with monitoring equipment using a monitoring device with
capability of storing measurement results . 19
Figure C.3 – ON check and OFF check timing portion . 19

Figure D.1 – Example of test results in the case of fixed number testing plan . 22

Table 1 – Contact load characteristics . 9
Table 2 – Recommended test current . 9
Table 3 – Recommended test voltage . 10
Table 4 – Recommended number of testing cycles . 10
Table 5 – Recommended value of contact-circuit resistance . 11
Table A.1 – Test procedures for electromechanical elementary relays . 15
Table B.1 – Test procedures for particular reed switch (reed contact) types and similar
products. 17
Table D.1 – Coefficient k for calculating failure rate . 21
Table D.2 – Failure rate level . 22
Table D.3 – Acceptable number and total testing cycles (number of testing cycles) . 23
Table E.1 – Example with number of cycles at which ON failures have been recorded . 24

– 4 – IEC 63522-48:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 48: Contact failure rate test

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