IEC 63522-56:2025

IEC 63522-56 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 56: Ball Pressure test
Relais électriques - Essais et mesurages -
Part 56: Essai à la bille
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IEC 63522-56 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 56: Ball Pressure test
Relais électriques - Essais et mesurages -
Part 56: Essai à la bille
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70 ISBN 978-2-8327-0351-9
– 2 – IEC 63522-56:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test procedure . 5
4.1 Purpose . 5
4.2 Procedure . 6
4.2.1 Pre-conditioning. 6
4.2.2 Test specimen . 6
4.2.3 Test process. 6
4.3 Conditions . 8
5 Evaluation . 8
5.1 General . 8
5.2 Test report . 8
Bibliography . 9

Figure 1 – Ball pressure test apparatus. 7
Figure 2 – Measurement points . 7

Table 1 – Measurement points . 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 56: Ball pressure test
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
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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.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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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
may be required to implement this document. However, implementers are cautioned that this may not represent
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 63522-56 have 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
94/1067/FDIS 94/1117/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 63522-56:2025 © 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 56: Ball pressure test
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 specimens to perform under
expected conditions of transportation, storage and all aspects of operational use.
The object of this test is to define a standard test method for evaluation of appropriate materials
to withstand mechanical pressure at elevated temperatures without undue deformation.
NOTE The test is not made on parts of ceramic material.
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: General and guidance
ISO 293, Plastics – Compression moulding of test specimens of thermoplastic materials
ISO 294 (all parts), Plastics – Injection moulding of test specimens of thermoplastic materials
ISO 295, Plastics – Compression moulding of test specimens of thermosetting materials
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
4 Test procedure
4.1 Purpose
The purpose of the ball pressure test is to assess the ability of materials to withstand
mechanical pressure at elevated temperatures without undue deformation.
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.

– 6 – IEC 63522-56:2025 © IEC 2025
4.2 Procedure
4.2.1 Pre-conditioning
The parts to be tested are stored for 24 h in an atmosphere having a temperature between
15 °C and 35 °C and a relative humidity between 45 % and 75 %, before starting the test.
4.2.2 Test specimen
4.2.2.1 End product test method
A test specimen is cut from the end product in such a way that a piece at least 2,5 mm thick
with approximately parallel upper and lower surfaces is obtained. If necessary, the thickness
may be attained by stacking two or more sections so long as there is no noticeable movement
between the surfaces prior to testing. If it is not possible to cut a test specimen with parallel
surfaces, care shall be taken to support the area of the test specimen directly under the
pressure ball. The test specimen shall be a square with a minimum of 10 mm sides or a circle
with a diameter of at least 10 mm.
If it is impracticable to use a test specimen from the end product, then a plaque of identical
material may be used as the test specimen as described in 4.2.2.2.
NOTE Three test specimens can be necessary.
4.2.2.2 Material Test method
4.2.2.2.1 Test specimen – Preparation
Test specimens shall be fabricated using the appropriate ISO method, for example casting and
injection moulding in accordance with the ISO 294 series, compression moulding in accordance
with ISO 293 or ISO 295, or transfer moulding to the necessary shape.
4.2.2.2.2 Test specimen – Dimensions
The dimensions of the planar sections of the test specimens shall be at least 10 mm in length
and 10 mm in width, or a circle with a diameter of at least 10 mm and shall be provided in a
thickness of 3,0 mm ± 0,5 mm.
NOTE Fifteen test specimens can be necessary.
4.2.3 Test process
The following applies for this document (see also IEC 60695-10-2):
The test is made in a heating cabinet at a temperature of 20 °C ± 2 °C plus the value of the
maximum temperature determined during the heating tests of IEC 63522-10, or at
• 75 °C ± 2 °C for external parts,
• 125 °C ± 2 °C for parts that support active parts,
whichever is higher.
The support and the test apparatus shall be at the specified test temperature before the test is
started.
The test apparatus is shown in Figure 1.
The surface of the part to be tested is placed in the horizontal position supported on a 3 mm
thick steel plate.
The thickness of the specimen shall be not less than 2,5 mm; if necessary, two or more layers
of the part subjected to the test shall be used.
A steel ball of 5 mm diameter is pressed against the surface of the specimen by a force of
20 N ± 0,2 N. Care should be taken that the ball does not move during the test.
After 1 h, the ball is removed from the specimen which is then cooled down to approximately
room temperature by immersion for 10 s in water. The water shall have a temperature within
the reference ambient temperature.
The diameter of the impression caused by the ball is measured with an accuracy of 0,1 mm
within 3 min after removal of the specimen from the water.

Figure 1 – Ball pressure test apparatus
The measurement points according to the descriptions are listed in Table 1. The diagrams in
Figure 2 illustrate these indentation measurement points.
Table 1 – Measurement points
Measurement points
A Edges of a simple indent
B Inside face of raised (rounded) edges
C Outside perimeter of raised (rounded) edges
D Limit of the shoulder of a slight subsidence
E Edges of the direct ball indent within a slight subsidence
Other Other – if applicable – description needed e.g., irregular shaped indent

Figure 2 – Measurement points
– 8 – IEC 63522-56:2025 © IEC 2025
4.3 Conditions
• Pre-conditioning as defined
• Test temperature
...