IEC 63522-20:2025

Electrical relays – Tests and measurements - Part 20: Mechanical endurance

IEC 63522-20:2025 This part of IEC 63522 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 mechanical endurance.

Relais électriques - Essais et mesurages - Partie 20: Endurance mécanique

IEC 63522-20:2025 La présente partie de l’IEC 63522 est utilisée pour les essais réalisés dans des conditions et des sévérités appropriées pour les mesurages et essais destinés à évaluer l'aptitude des DUT à fonctionner dans des conditions prévues de transport, de stockage et d'utilisation opérationnelle sous tous ses aspects.
Le présent document définit une méthode d'essai normalisée pour l'endurance mécanique.

General Information

• Status: Published
• Publication Date: 21-Apr-2025
• 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: 22-Apr-2025
• Completion Date: 28-Feb-2025

Standards Content (Sample)

IEC 63522-20 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 20: Mechanical endurance
Relais électriques – Essais et mesurages –
Partie 20: Endurance mécanique
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IEC 63522-20 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 20: Mechanical endurance
Relais électriques – Essais et mesurages –

Partie 20: Endurance mécanique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0353-3

– 2 – IEC 63522-20:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test procedure . 6
4.1 Purpose . 6
4.2 Procedure . 6
4.2.1 General. 6
4.2.2 Method 1: Continuous checking . 6
4.2.3 Method 2: Intermediate checking . 6
4.3 Conditions to be specified. 7
5 Evaluation . 7
5.1 General . 7
5.1.1 Number of cycles . 7
5.1.2 Visual inspection . 7
5.1.3 Final measurement . 7
5.2 Test report . 7

IEC63522-20:2025 © IEC 2025 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 20: Mechanical endurance
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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IEC 63522-20 has been prepared by IEC technical committee 94: Electrical relays. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
94/1062/FDIS 94/1113/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 4 – IEC 63522-20:2025 © IEC 2025
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of IEC 63522 series, published under the general title Electrical relays – Tests
and measurements, can be found on the IEC website.
This International Standard is to be used in conjunction with IEC 63522-0:– .
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.

IEC63522-20:2025 © IEC 2025 – 5 –
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 20: Mechanical endurance
1 Scope
This part of IEC 63522 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 mechanical endurance.
2 Normative references
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.
IEC 63522-0:– , Electrical relays – Tests and measurements – Part 0: Testing – General and
guidance
IEC 63522-6, Electrical relays – Tests and measurements – Part 6: Contact-circuit resistance
(or voltage drop)
IEC 63522-7:– , Electrical relays – Tests and measurements – Part 7: Functional tests
IEC 63522-45, Electrical relays – Tests and measurements – Part 45: Maximum frequency of
operation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63522-0 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-7:2024.

– 6 – IEC 63522-20:2025 © IEC 2025
4 Test procedure
4.1 Purpose
The test determines the mechanical performance of relays under specified energization
conditions over an extended number of cycles.
NOTE The mechanical endurance is unrelated to electrical endurance. However, performed electrical endurance
can be assessed as a mechanical endurance.
4.2 Procedure
4.2.1 General
The relay shall be energized with the rated coil voltage or an appropriate value within the rated
coil voltage range or operative range and the test shall be conducted at ambient room
temperature or as otherwise specified.
Unless otherwise specified, the mechanical endurance shall be performed with nominal coil
voltage.
For alternate current coil driven relays, the switching action shall not be synchronous with the
source of the monitoring circuit. The frequency of operation shall be as specified; the relay shall
attain both the operate and release/reset condition within one cycle. However, the frequency of
operations shall be less than the maximum frequency of operation according to IEC 63522-45,
if not otherwise specified by a detailed specification or the manufacturer.
It is good practice that the chosen contact load should ensure reliable monitoring of the
performed cycle, whilst not causing a level of wear of the contact points that might devalue the
test. It is recommended to use a load within CC0 or CC1 category.
4.2.2 Method 1: Continuous checking
4.2.2.1 With contact load monitoring
The mechanical operation of the relay shall be monitored electrically, using a contact load as
specified. The contact load chosen shall ensure reliable monitoring of the performed cycles,
while not causing a level of wear of the contact points that might devalue the test.
It is permitted that all the contacts of the same type of the relay are connected in parallel, or as
specified by the relevant standards or the manufacturer.
NOTE It is possible to gather more information on the single contact monitoring for product development reasons.
This is up to the manufacturer.
4.2.2.2 With other monitoring means
It is permitted to use other monitoring methods such as the coil current curve or sensors.
Reliable monitoring of the performed cycle shall be ensured.
4.2.3 Method 2: Intermediate checking
Intermediate checking shall be made as specified by the manufacturer, but at least at each 20%
of the specified mechanical endurance.

IEC63522-20:2025 © IEC 2025 – 7 –
4.3 Conditions to be specified
The valid influence quantities shall be in accordance with IEC 63522-0:–, 4.4.
The conditions to be specified are the following:
a) method 1 or 2;
b) mounting conditions;
c) energization value;
...