IEC 63522-22:2025

IEC 63522-22 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 22: Limiting continuous current

Relais électriques – Essais et mesurages –
Partie 22: Courant limite de service continu
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IEC 63522-22 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 22: Limiting continuous current

Relais électriques – Essais et mesurages –

Partie 22: Courant limite de service continu

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0354-0

– 2 – IEC 63522-22:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Test procedure . 6
4.1 Purpose . 6
4.2 Procedure . 6
4.3 Conditions . 6
5 Evaluation . 7
5.1 General . 7
5.2 Test report . 7
Bibliography . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 22: Limiting continuous current

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
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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6) All users should ensure that they have the latest edition of this publication.
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63522-22 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
94/1061/FDIS 94/1112/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 63522-22:2025 © 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.

ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 22: Limiting continuous current

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 evaluation of the limiting continuous current
under specified conditions.
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 63522-4:– , Electrical relays – Tests and measurements – Part 4: Dielectric strength test
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 63522-8:– , Electrical relays – Tests and measurements – Part 8: Timing
IEC 63522-10:– , Electrical relays – Tests and measurements – Part 10: Heating
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-4:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-6:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-7:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-8:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-10:2024.

– 6 – IEC 63522-22:2025 © IEC 2025
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63522-0 and the
following 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
3.1
limiting continuous current
greatest value of electric current which a closed contact is capable of carrying continuously
under specified conditions
[IEC 60050-444:2002, 444-04-28, modified – Deletion of "of an output circuit" in the term,
deletion of "or effectively conducting output" in the definition and Note has been removed.]
4 Test procedure
4.1 Purpose
The purpose of the test is to assess the suitability of the contacts to carry the limiting continuous
current.
4.2 Procedure
The relay terminals shall be connected as given in IEC 63522-10:–, Annex A.
The coil(s) shall be energized with the rated coil voltage unless otherwise specified (testing in
operate condition), and not energized (testing in release/reset condition) for bistable relays or
break contacts only.
The test shall be performed at ambient temperature, if not otherwise specified.
NOTE 1 Temperature cycling can also apply, if specified by the manufacturer.
The contacts shall be loaded with a current as specified by the manufacturer for the contact
set, until thermal equilibrium is reached. Then the relay shall be cooled down until the ambient
temperature is reached.
...