SIST EN IEC 63522-48:2025

SLOVENSKI STANDARD
01-maj-2025
Električni releji - Preskusi in meritve - 48. del: Delež neuspešnih preskusov
Electrical relays - Tests and measurements - Part 48: Contact failure rate test
Elektrische Relais - Prüfungen und Messungen - Teil 48: Prüfung der Kontaktausfallrate
Relais électriques - Essais et mesurages - Partie 48: Essai de taux de défaillance des
contacts
Ta slovenski standard je istoveten z: EN IEC 63522-48:2025
ICS:
29.120.70 Releji Relays
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63522-48

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2025
ICS 29.120.70
English Version
Electrical relays - Tests and measurements - Part 48: Contact
failure rate test
(IEC 63522-48:2024)
Relais électriques - Essais et mesurages - Partie 48 : Essai Elektrische Relais - Prüfungen und Messungen - Teil 7-48:
de taux de défaillance des contacts Prüfung der Kontaktausfallrate
(IEC 63522-48:2024) (IEC 63522-48:2024)
This European Standard was approved by CENELEC on 2025-01-09. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63522-48:2025 E

European foreword
The text of document 94/1039/FDIS, future edition 1 of IEC 63522-48, prepared by TC 94 "Electrical
relays" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-01-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-01-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63522-48:2024 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60605-4 2001 Equipment reliability testing - Part 4: - -
Statistical procedures for exponential
distribution - Point estimates, confidence
intervals, prediction intervals and tolerance
intervals
IEC 61810-1 - Electromechanical elementary relays - Part EN 61810-1 -
1: General and safety requirements
IEC 61810-2 - Electromechanical elementary relays - Part EN 61810-2 -
2: Reliability
IEC 61810-4 - Electromechanical elementary relays - Part EN IEC 61810-4 -
4: General and safety requirements for
reed relays
IEC 62246-1 - Reed switches - Part 1: Generic EN 62246-1 -
specification
IEC 62246-1-1 2018 switches – Part 1-1: Generic specification - EN IEC 62246-1-1 2018
Blank detail specification
IEC 62246-4 2023 Reed switches - Part 4: Application in EN IEC 62246-4 2023
conjunction with magnetic actuator used
for magnetic sensing devices
1 2
IEC 63522-0 — Electrical relays - Tests and Measurements EN IEC 63522-0 —
- Part 0: General and Guidance
3 4
IEC 63522-6 - Electrical relays - Tests and measurements EN IEC 63522-6 -
- Part 6: Contact-circuit resistance (or
voltage drop)
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.
Under preparation. Stage at the time of publication: prEN IEC 63522-0:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-6:2024.
Under preparation. Stage at the time of publication: FprEN IEC 63522-6:2024.
Publication Year Title EN/HD Year
5 6
IEC 63522-7 - Electrical relays - Tests and measurements EN IEC 63522-7 -
- Part 7: Functional tests
7 8
IEC 63522-45 — Electrical relays - Tests and measurements EN IEC 63522-45 —
- Part 45: Maximum frequency of operation

Under preparation. Stage at the time of publication: IEC BPUB 63522-7:2024.
Under preparation. Stage at the time of publication: FprEN IEC 63522-7:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-45:2024.
Under preparation. Stage at the time of publication: FprEN IEC 63522-45:2024.
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

IEC 63522-48:2024 © IEC 2024 – 3 –
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
...