IEC 63522-25:2025

IEC 63522-25 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 25: Magnetic interference

Relais électriques – Essais et mesurages –
Partie 25 : Perturbations par les champs magnétiques
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IEC 63522-25 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 25: Magnetic interference

Relais électriques – Essais et mesurages –

Partie 25 : Perturbations par les champs magnétiques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0196-6

– 2 – IEC 63522-25:2025 © 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 Method 1 . 6
4.2.2 Method 2 . 6
4.2.3 Method 3 . 8
4.3 Conditions to be specified . 8
5 Evaluation . 8
5.1 General . 8
5.2 Test report . 9
Bibliography . 10

Figure 1 – Mounting array for adjacent similar relays . 6
Figure 2 – Mounting direction for adjacent similar relays . 7
Figure 3 – Example of test arrangement for multi mounting . 7
Figure 4 – Directions of the test current for magnetic interference test, method 3 . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
TESTING AND MEASUREMENT –
Part 25: Magnetic interference

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,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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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
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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)
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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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shall not be held responsible for identifying any or all such patent rights.
IEC 63522-25 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
94/1055/FDIS 94/1115/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 63522-25:2025 © 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 –
TESTING AND MEASUREMENT –
Part 25: Magnetic interference

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 to check the magnetic interference between
relays under operating conditions and their influence on other relays in the neighbourhood.
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 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
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 63522-7, Electrical relays – Tests and measurements – Part 7: Functional tests
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.

– 6 – IEC 63522-25:2025 © IEC 2025
4 Test procedure
4.1 Purpose
The test checks that the functional performance values of the relay remain within specified limits
when the relay is subjected to the effects of external magnetic inductions.
4.2 Procedure
4.2.1 Method 1
The relay shall be mounted by suitable non-magnetic means within the central volume of a test
coil. The axis of maximum sensitivity of the relay shall be aligned with the longitudinal axis of
the test coil. Operate and release values shall be measured in accordance with IEC 63522-7 in
zero magnetic field in air and
– for magnetically shielded relays: in (8 × 10 ) A/m;
– for all other relays: in (0,8 × 10 ) A/m,
magnetic field of both polarities.
4.2.2 Method 2
The relay under test and eight similar relays of the same type shall be mounted in the same
physical orientation by non-magnetic means, as shown in Figure 1, unless otherwise specified
by the manufacturer. Operate and release values of the relay under test shall be measured as
specified in IEC 63522-7, with the coils of the eight outer relays energized at rated voltage, and
with the coils not energized. The magnetic polarity of each relay shall be similarly orientated.

Figure 1 – Mounting array for adjacent similar relays
The relays shall be placed in all possible usage combinations, as shown in Figure 2.

Figure 2 – Mounting direction for adjacent similar relays
For reed relays, the following applies:
The manufacturer shall declare different values for functional operate voltage and release
voltage between single mounting and multi mounting (i.e. reed relays are mounted in array
arrangement).
The mounting grid pattern shall be as specified by the manufacturer. See Figure 3 for an
example, all relevant details of the test arrangement (e.g., S : horizontal mounting distance and
S : vertical mounting distance and coil polarity) shall be indicated in the test report.
Key
1, 2 contact terminals, a, b: coil terminals
S horizontal mounting distance between relays
S vertical mounting distance between relays
Figure 3 – Example of test arrangement for multi mounting

– 8 – IEC 63522-25:2025 © IEC 2025
4.2.3 Method 3
The relay to be tested shall be mounted by non-magnetic means. A conducting wire of 0,5 mm
diameter shall be placed on the test relay surface in 24 directions as shown in Figure 4. One
current impulse with wavesape 1/20 µs in accordance with IEC 60060-1 shall be applied in each
of these directions. Operate and release values of the relay under test shall be measured as
specified in IEC 63522-7 in each of the wire positions after the respective current impulse. The
following current impulse shall be used, unless otherwise specified by t
...