IEC 63522-9:2025

IEC 63522-9 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 9: Climatic tests
Relais électriques – Essais et mesurages –
Partie 9: Essais climatiques
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IEC 63522-9 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 9: Climatic tests
Relais électriques – Essais et mesurages –
Partie 9: Essais climatiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70 ISBN 978-2-8327-0346-5
– 2 – IEC 63522-9:2025 © 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
4.2.1 General. 6
4.2.2 Dry heat . 7
4.2.3 Cold . 7
4.2.4 Low air pressure . 7
4.2.5 Damp heat, cyclic . 7
4.2.6 Damp heat steady state . 8
4.3 Conditions . 8
5 Evaluation . 9
5.1 General . 9
5.1.1 Overview . 9
5.1.2 Final measurements . 9
5.1.3 Final judgement . 9
5.2 Test report . 9
Bibliography . 10

Table 1 – Summary of tests . 6

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 9: Climatic tests
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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shall not be held responsible for identifying any or all such patent rights.
IEC 63522-9 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
94/1068/FDIS 94/1097/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 63522-9:2025 © 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 9: Climatic tests
1 Scope
This part of IEC 63522 is used for testing all kind of electrical relays and for evaluating their
ability to perform under expected conditions of transportation, storage and all aspects of
operational use.
NOTE Examples for electrical relays in the sense of this document include electromechanical relays, reed relays,
reed contacts, reed switches, solid state relays, time relays and technology combinations of these.
It defines standard test methods to determine the ability of the relay to withstand certain climatic
test conditions, a sequence of such climatic test conditions or climatic storage 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 60068-2-1:1990, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-1:1990/AMD1:1993
IEC 60068-2-1:1990/AMD2:1994
IEC 60068-2-2:1974, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-2:1974/AMD1:1993
IEC 60068-2-2:1974/AMD2:1994
IEC 60068-2-13, Environmental testing – Part 2-13: Tests – Test M: Low air pressure
IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 h+ 12 h cycle)
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state
IEC 63522-0:– , Electrical relays – Tests and measurements – Part 0: General and guidance
IEC 63522-1:– , Electrical relays – Tests and measurements – Part 1: Visual inspection and
check of dimensions
IEC 63522-5:– , Electrical relays – Tests and measurements – Part 5: Insulation resistance
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-1:2024.
Under preparation. Stage at the time of publication: IEC CDV 63522-5:2024.

– 6 – IEC 63522-9:2025 © IEC 2025
IEC 63522-6:2025, Electrical relays – Tests and measurements – Part 6: Contact-circuit
resistance (or voltage drop)
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
To determine the ability of the DUT to withstand certain climatic test conditions or a sequence
of such climatic test conditions. For this purpose, the individual climatic tests described under
4.2.2 to 4.2.6 hereinafter can be carried out as separate tests. However, when a climatic
sequence is required, this sequence shall be as specified below. The damp heat steady state
test is to assess the suitability of the DUT for use or storage under conditions of high relative
humidity, or both.
4.2 Procedure
4.2.1 General
A summary of tests, conditions and evaluation details is summarized in Table 1.
Table 1 – Summary of tests
Test Standard Duration Conditions At the end of Recovery Final
test time evaluation
Dry heat Test Ba of 16 h 4.3 a) to q) Functional test 1 h to 2 h Visual
IEC 60068-2-2 immediately inspection
(4.2.2)
after test
duration at
elevated
temperature
Cold Test Aa or test Ab of 2 h 4.3 a) to q) 200 cycles at 1 h to 2 h Visual
IEC 60068-2-1 specified coil inspection
(4.2.3)
voltage and load
Low air Test M of 30 min 4.3 a) to q) Dielectric test 1 h 2 h Visual
pressure IEC 60068-2-13 under low inspection
pressure
(4.2.4)
Damp heat Test Db variant 2 of 12 h + 4.3 a) to q) (Recovery) 1 h to 2 h Visual
cycle IEC 60068-2-30 12 h, inspection
number of
(4.2.5)
cycles as
specified
Damp heat Test Cab As 4.3 a) to v) (Recovery) 1 h to 2 h Visual
steady state IEC 60068-2-78 specified inspection,
insulation
(4.2.6)
resistance,
contact
circuit
resistance
4.2.2 Dry heat
This test shall be carried out in accordance with test Ba or, if in relation to the test facilities, the
DUT is to be considered as an appreciably heat-dissipating specimen, with test Bc of
IEC 60068-2-2.
The duration period shall be 16 h. During the last 2 h of the dry heat exposure time, the DUT
shall be energized as specified and as follows:
a) for DUTs for continuous duty, the coil voltage shall be applied continuously for 2 h;
b) for DUTs for short-time or intermittent duty, the coil voltage shall be applied by pulses at
the number of cycles per hour and the duty factor, both as specified for the product;
c) contacts shall be loaded as specified.
Immediately following the 2 h operating period and still under dry heat exposure, all DUTs shall
have a functional test as specified.
4.2.3 Cold
This test shall be carried out in accordance with test Aa (sudden change of temperature) or test
Ab (gradual change of temperature) of IEC 60068-2-1.
The duration period shall be 2 h.
At the end of the conditioning period and before removal from the chamber, the DUT shall be
energized for 100 cycles at the coil voltage value as specified.
During the operating tests, all contacts shall be loaded as specified. The contact function shall
be checked as specified.
4.2.4 Low air pressure
This test shall be carried out in accordance with test M of IEC 60068-2-13. The duration period
shall be 30 min at normal ambient temperature.
At the end of the test period, and while the DUT is still under low pressure, a dielectric test
voltage as specified shall be applied between:
a) the two ends of the coil connected together (positive) and all other terminals together with
the exposed conductive parts (negative);
b) the terminals of an open circuit contact; break contacts shall be opened for this test.
During the dielectric test, there shall be no flashover or breakdown of the insulation of the DUT.
4.2.5 Damp heat, cyclic
This test shall be carried out when specified.
Upon completion of the cycle, the DUT shall be removed from the chamber and exposed to the
recovery conditions specified.
This test shall be carried out in accordance with test Db variant 2 of IEC 60068-2-30, where
one cycle consists of 12 h at 25 °C followed by 12 h at the specified upper temperature. The
number of cycles shall be one or more as specified.
Upon completion of the cycles, the DUT shall be removed from the chamber and exposed to
the recovery conditions specified.

– 8 – IEC 63522-9:2025 © IEC 2025
After recovery, the DUT shall be immediately subjected to the cold test.
4.2.6 Damp heat steady state
This test shall be carried out in accordance with test Cab of IEC 60068-2-78. During the
exposure time of the DUTs, one half of the number of samples exposed shall have a potential
of (100 ± 10) V DC or as specified, applied between the two ends of the coil connected together
(positive) and all other terminals together with the exposed conductive parts (negative). When
assessing the suitability for storage conditions only, it is not necessary to apply voltage.
At the end of the conditioning period, the DUTs shall be removed from the chamber and exposed
to the recovery conditions specified by the manufacturer.
4.3 Conditions
Unless otherwise described in this document the conditions of IEC 63522-0 are applicable.
The conditions to be specified are the following.
For tests of 4.2.2 to 4.2.5:
a) temperatures and humidity conditions of the tests;
b) degree of severity of the climatic conditions and recovery conditions;
c) coil voltage value, contact load during dry heat exposure, last 2 h;
d) details of the functional test after dry heat exposure;
e) whether or not the damp heat, cyclic, first cycle test is required;
f) for the cold test, method Aa or Ab;
g) coil voltage value, contact load after cold exposure for 100 cycles and criteria of contact
function, if required;
h) whether or not the low pressure exposure is required;
i) value of the dielectric test voltage during low pressure exposure;
j) whether or not the damp heat, cyclic, all or remaining cycles test is required;
k) permitted degradation in insulation resistance;
l) permitted increase in contact circuit resistance;
m) mechanical deterioration to be checked;
n) duration period for dry heat if different from 16 h;
o) duration period for cold if different from 2 h;
p) duration period for low air pressure if different from 30 min;
q) temperature for low air pressure if different from normal ambient temperature;
r) other final measurements, if required.
For the test of 4.2.6:
s) severity (temperature, relative humidity and duration), details of the conditioning and
recovery conditions;
t) voltage to be applied if other than (100 ± 10) V DC;
u) permitted insulation resistance after test;
v) permitted contact resistance after test.

5 Evaluation
5.1 General
5.1.1 Overview
A final evaluation of the test shall be done as specified in 5.2. Intermediate measurements can
be specified as needed or required by an application standard. Care should be taken on the
recovery time of the samples.
5.1.2 Final measurements
5.1.2.1 For all tests
After recovery of not less than 1 h and not more than 2 h, the DUT shall be visually inspected
in accordance with IEC 63522-1. There shall be no evidence of corrosion, peeling, chipping, or
of mechanical deterioration that could impair operation.
Other final measurements, if required, shall be done as specified.
5.1.2.2 For the test of 4.2.6
Insulation resistance shall be measured in accordance with IEC 63522-5. Degradation shall be
permitted as specified according to 4.3 u).
Contact circuit resistance shall be measured in accordance with IEC 63522-6. Increase shall
be permitted as specified according to 4.3 v).
5.1.3 Final judgement
A single test or a combination of tests shall be considered passed, when the results of the final
measurements meet the expected requirements.
5.2 Test report
If this document is executed as a part of a test record of another standard, then the results shall
be reported as required in the other standard.
Otherwise, it is recommended to issue a dedicated test report according to this document.
The test report shall contain all the information necessary to reproduce the test. In particular,
the following shall be recorded:
• description of the DUT before and after the test;
• test conditions;
• applicable conditions of 4.3;
• test result (pass or fail).
– 10 – IEC 63522-9:2025 © IEC 2025
Bibliography
IEC 60038, IEC standard voltages
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60068-2-20, Environmental testing – Part 2-20: Tests – Test Ta and Tb: Test methods for
solderability and resistance to soldering heat of devices with leads
IEC 60085, Electrical insulation – Thermal evaluation and designation
IEC 60364-4-44, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60417, Graphical symbols for use on equipment
(available at https://www.graphical-symbols.info/equipment)
IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems
IEC 60695-2-10, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods – Glow-
wire apparatus and common test procedure
IEC 60947-2:2016, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-5-1, Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and
switching elements – Electromechanical control circuit devices
IEC 61210, Connecting devices – Flat quick-connect terminations for electrical copper
conductors – Safety requirements
IEC 61810-1, Electromechanical elementary relays – Part 1: General and safety requirements
IEC 61810-7:2006, Electromechanical elementary relays – Part 7: Test and measurement
procedures
IEC
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