IEC 63522-7:2025

Electrical relays - Tests and measurements - Part 7: Functional tests

IEC 63522-7:2025 is used for testing electromechanical elementary relays (electromechanical relays, reed relays, reed contacts, reed switches and technology combination of these) and evaluates their ability to perform under expected conditions of transportation, storage and all aspects of operational use.
This document defines a standard test method to evaluate the switching function of the device under test (DUT) at specified energization values throughout the defined temperature range.

Relais électriques - Essais et mesurages - Partie 7: Essais fonctionnels

IEC 63522-7:2025 traite des essais des relais électromécaniques élémentaires (relais électromécaniques, relais à lames souples, contacts à lames souples et leur combinaisons technologiques) et permet d'évaluer leur aptitude à fonctionner dans des conditions prévues de transport, de stockage, et tous les aspects d'utilisation opérationnelle.
Le présent document définit une méthode d'essai normalisée pour évaluer la fonction de commutation du dispositif soumis à l'essai (DUT, Device Under Test) à des valeurs d'alimentation spécifiées dans la plage de températures définie.

General Information

• Status: Published
• Publication Date: 14-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: 15-Apr-2025
• Completion Date: 06-Dec-2024

Standards Content (Sample)

IEC 63522-7 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 7: Functional tests
Relais électriques – Essais et mesurages –
Partie 7: Essais fonctionnels
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IEC 63522-7 ®
Edition 1.0 2025-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 7: Functional tests
Relais électriques – Essais et mesurages –

Partie 7: Essais fonctionnels
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0329-8

– 2 – IEC 63522-7:2025 © IEC 2025
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Test procedure . 7
4.1 Purpose . 7
4.2 Procedure . 7
4.3 Conditions . 13
5 Evaluation . 14
5.1 General . 14
5.2 Test report . 14
Annex A (normative) Test procedures for particular relay types . 15
A.1 Elementary relays with reed switches (reed contacts) . 15
A.1.1 General . 15
A.1.2 Procedure . 15
A.1.3 Requirements . 16
A.1.4 Information to be stated in the detail specification . 17
A.1.5 Influence of magnetic interferences . 17
A.1.6 Railway applications . 18
A.2 Time relays for industrial and residential use . 19
A.2.1 General . 19
A.2.2 Operate . 19
A.2.3 Release . 19
A.2.4 Time function . 20
A.3 Solid-state relays . 20
A.3.1 General . 20
A.3.2 OFF-state leakage current measurement . 21
A.3.3 ON-state voltage drop measurement . 21
A.4 Relays with forcibly guided (mechanically linked) contacts . 21
A.4.1 General . 21
A.4.2 Functional requirements . 21
A.4.3 Test procedure . 21
Annex B (normative) Standard test coils and test systems for reed switches . 23
B.1 Standard test coils for reed switches . 23
B.2 Ideal solenoid . 24
B.3 Test systems for reed switches . 25
B.3.1 Definition of test systems . 25
B.3.2 Test procedures and conditions of testing . 26
Bibliography . 27

Figure 1 – Monostable non-polarized DUT . 9
Figure 2 – Monostable DUT polarized by diode . 10
Figure 3 – Monostable polarized DUT with magnetic biasing . 11
Figure 4 – Bistable non-polarized DUT (not applicable to remanence DUTs) . 12
Figure 5 – Bistable polarized DUT (example) . 13

Figure A.1 – Example of test arrangement for multi-mounting . 18
Figure B.1 – Configuration of test coils . 23
Figure B.2 – Test system 1 . 25
Figure B.3 – Test system 2 . 25

Table 1 – Energization quantity values and corresponding functions . 8
Table A.1 – Special requirements for railway applications – Rolling stock . 19
Table A.2 – Changing of influencing quantities. 20
Table B.1 – List of standard test coils . 23

– 4 – IEC 63522-7:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS – TESTS AND MEASUREMENTS –

Part 7: Functional tests
FOREWORD
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IEC 63522-7 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
94/1048/FDIS 94/1083/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.

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 the IEC 63522 series, published under the general title Electrical relays –
Tests and measurements, can be found on the IEC website.
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.
– 6 – IEC 63522-7:2025 © IEC 2025
ELECTRICAL RELAYS – TESTS AND MEASUREMENTS –

Part 7: Functional tests
1 Scope
This document is used for testing electromechanical elementary relays (electromechanical
relays, reed relays, reed contacts, reed switches and technology combinations of these) and
evaluates their ability to perform under expected conditions of transportation, storage and all
aspects of operational use.
This document defines a standard test method to evaluate the switching function of the device
under test (DUT) at specified energization values throughout the defined temperature range.
This test method is part of the general DUT type test according to IEC 61810-1:2015, Table 3.
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 60077-1, Railway applications – Electric equipment for rolling stock – Part 1: General
service conditions and general rules
IEC 60571:2012, Railway applications – Electronic equipment used on rolling stock
IEC 61373:2010, Railway applications – Rolling stock equipment – Shock and vibration tests
IEC 61810-1:2015, Electromechanical elementary relays – Part 1: General and safety
requirements
IEC 61810-1:2015/AMD1:2019
IEC 61810-2:2017, Electromechanical elementary relays – Part 2: Reliability
IEC 61810-2-1:2017, Electromechanical elementary relays – Part 2-1: Reliability – Procedure
for the verification of B10 values
IEC 61810-3:2015, Electromechanical elementary relays – Part 3: Relays with forcibly guided
(mechanically linked) contacts
IEC 61812-1:2023, Time relays and coupling relays for industrial and residential use – Part 1:
Requirements and tests
IEC 62246-1:2015, Reed switches – Part 1: Generic specification
IEC 62479, Assessment of the compliance of low-power electronic and electrical equipment
with the basic restrictions related to human exposure to electromagnetic fields (10 MHz to
300 GHz)
IEC 62497-1:2010, Railway applications – Insulation coordination – Part 1: Basic requirements
– Clearances and creepage distances for all electrical and electronic equipment

IEC 62498-1, Railway applications – Environmental conditions for equipment – Part 1:
Equipment on board rolling stock
IEC 63522-0:—, Electrical relays – Tests and measurements – Part 0: Testing – General and
guidance
IEC 63522-25:2025, Electrical relays – Tests and measurements – Part 25: Testing – Magnetic
interference
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 test procedure is to ensure that the DUT performs satisfactorily at its
specified energization values throughout the defined temperature range.
4.2 Procedure
The tests stated in this document shall be carried out with appropriate test conditions and
severities, as well as suitable measurements conditions.
The basic operation functions for monostable and bistable relays are described in
IEC 61810-1:2015, Clause 9. The following functional tests cover a wider range and shall be
done in a sequence that covers all foreseeable DUT states and state changes. Table 1 sets out
the applicable values and the significance of the functional tests, referring to Figure 1 to
Figure 5, which give typical examples.
Additional and/or alternative functional test procedures for particular types of relays are
specified in Annex A:
• Elementary relays with reed switches (Clause A.1);
• Time relays for industrial and residential use (Clause A.2);
• Solid-state relays (Clause A.3);
• Relays with forcibly guided (mechanically linked) contacts (Clause A.4).
___________
First edition under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.

– 8 – IEC 63522-7:2025 © IEC 2025
Table 1 – Energization quantity values and corresponding functions
Diagram code Applied energization The DUT shall: Applicable to:
(see Figure 1 quantity
to Figure 5)
a Non-operate voltage Not operate All types
b Operate voltage Operate All types
c Rated voltage Operate / remain operated All types
d Non-revert voltage Remain operated Polarized
e Non-release voltage Not release Monostable
f Release voltage Release Monostable
g Non-reset voltage Not reset Bistable
h Reset voltage Reset Bistable
i Revert reverse voltage Operate Bistable
j Reverse rated voltage Reset Bistable polarized
k Non-revert reverse voltage Remain non-operated / reset Bistable polarized
l Reverse polarity voltage Not operate Monostable polarized
x Preconditioning value Be preconditioned All if required
y Setting voltage Be set in required position All if required
z Reverse setting voltage Be set in required position All if required

Testing shall be carried out in the order given in Figure 1 to Figure 5, unless otherwise specified
by the manufacturer.
When required by the manufacturer or by the relay specification, the external magnetic
preconditioning shall be applied, respecting the correct orientation of the DUT with regard to
the applied external magnetic fields.
When proceeding from one step to the next, the characteristics of the coil voltage shall be as
specified by the manufacturer. The corresponding function of the DUT shall be checked by
electrically monitoring the contact state as defined in IEC 63522-0.
DUTs incorporating permanent magnets should be preconditioned with the rated voltage for a
full cycle to achieve consistent electrical measurements. In case of expected external influences
like shocks, which may change contact state without energization, the functional tests should
be executed with and without preconditioning to verify performance.
For statistical evaluation across a number of DUTs or several batches of DUTs, actual data for
the values given in Table 1 may be recorded instead of attributive testing.

Key
a non-operate voltage e non-release voltage (monostable DUTs)
b operate voltage f release voltage (monostable DUTs)
c rated voltage x preconditioning voltage
The upper traces each represent the energization values, the lower traces indicate the condition of the contact
(0 = release condition, 1 = operate condition).
The preconditioning pulses are examples only. Any other waveform direction, duration or amplitude may be used.
NOTE The drawings are not to scale.
Figure 1 – Monostable non-polarized DUT

– 10 – IEC 63522-7:2025 © IEC 2025

Key
a non-operate voltage e non-release voltage (monostable DUTs)
b operate voltage f release voltage (monostable DUTs)
c rated voltage k reverse polarity voltage
d non-revert voltage x preconditioning voltage
The upper traces each represent the energization values, the lower traces indicate the condition of the contact
(0 = release condition, 1 = operate condition).
The preconditioning pulses are examples only. Any other waveform direction, duration or amplitude may be used.
NOTE The drawings are not to scale.
Figure 2 – Monostable DUT polarized by diode

Key
a non-operate voltage e non-release voltage (monostable DUTs)
b operate voltage f release voltage (monostable DUTs)
c rated voltage l reverse polarity voltage
d non-revert voltage x preconditioning voltage
The upper traces each represent the energization values, the lower traces indicate the condition of the contact
(0 = release condition, 1 = operate condition).
The preconditioning pulses are examples only. Any other waveform direction, duration or amplitude may be used.
NOTE The drawings are not to scale.
Figure 3 – Monostable polarized DUT with magnetic biasing

– 12 – IEC 63522-7:2025 © IEC 2025

Key
a non-operate voltage h reset voltage (bistable DUTs)
b operate voltage x (reverse) preconditioning voltage
c rated voltage y setting voltage
g non-reset voltage (bistable DUTs) z reverse setting voltage
The upper traces each represent the energization values, the lower traces indicate the condition of the contact
(0 = release condition, 1 = operate condition).
The preconditioning pulses are examples only. Any other waveform direction, duration or amplitude may be used.
NOTE The drawings are not to scale.
Figure 4 – Bistable non-polarized DUT (not applicable to remanence DUTs)

Key (arranged by duality of characteristics)
a non-operate voltage g non-reset voltage (bistable DUTs)
b operate voltage h reset voltage (bistable DUTs)
c rated voltage j reverse rated voltage
d non-revert voltage k reverse non-revert voltage
x preconditioning voltage
y setting voltage z reverse setting voltage
The upper traces each represent the energization values, the lower traces indicate the condition of the contact
(0 = release condition, 1 = operate condition).
The preconditioning pulses are examples only. Any other waveform direction, duration or amplitude may be used.
NOTE 1 The drawings are not to scale.
NOTE 2 The sequence in this figure, bistable polarized DUT, is an example only. Other sequences can apply to
further types of such DUTs.
Figure 5 – Bistable polarized DUT (example)
4.3 Conditions
The DUT shall be in a new and clean condition, mounted as in service or as specified by the
manufacturer. The test shall be performed under applicable reference conditions given in
IEC 63522-0:— , 4.4.
The conditions to be specified are the following:
a) Energization quantity values and values for preconditioning, as required, and their polarity;
b) number of DUTs for the test;
c) order of steps, if different from the sequences described in 4.2;
d) application of consecutive pulses or voltage ramp, instead of stepwise changes, if
applicable;
e) duration of steps and time between the steps, or device to be used to perform them, if a
more precise specification is required;
___________
First edition under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.

– 14 – IEC 63522-7:2025 © IEC 2025
f) application of the test to new DUTs or after a specified number of cycles, or any other pre-
treatment, if required;
g) mechanical setup (installation, mechanical fixation, orientation of DUT, etc.);
h) reference conditions (ambient temperature, humidity, etc.), if different from those of
IEC 63522-0:— , Table 2.
i) magnetic orientation, if required;
j) details of monitoring, if required;
k) contact monitoring load;
l) precycling, if required.
For the test, the specified duty cycle shall be maintained to avoid impermissible coil heating.
NOTE 1 General requirements on the switching function for elementary relays are stated in IEC 61810-1:2015,
Clause 9.
NOTE 2 Recommended coil voltage values for release and reset are stated in IEC 61810-1:2015, 5.4 and 5.5,
respectively.
5 Evaluation
5.1 General
The DUT shall respond to each functional test step with its intended contact state for each
defined voltage step. The DUT response should be recorded and documented, for each
individual test step of each DUT test. The test is passed if all steps are performed satisfactorily.
5.2 Test report
If this document is applied 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 in accordance with this document.
The test report shall contain all the information necessary to reproduce the test. In particular,
the following shall be recorded:
The test report shall include at least the following:
• Number of DUTs under test, numbered individually;
• Initial condition of each of the DUTs;
• Test procedure applied according to 4.2;
• Test conditions used according to 4.3;
• Evaluation of each of the DUTs individually, as defined under 5.1;
• Test method/setup (only if several setups possible)
• If applicable, any other observations.

___________
First edition under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.

Annex A
(normative)
Test procedures for particular relay types
A.1 Elementary relays with reed switches (reed contacts)
A.1.1 General
For elementary relays with reed switches (reed contacts) the following test and measurement
procedures for functional tests, which are in accordance with IEC 62246-1:2015, 6.5, shall be
applied.
A.1.2 Procedure
A.1.2.1 Procedures for reed switches
Functional tests shall be applied, in the order given, to the switch mounted in a test coil. Unless
otherwise defined by the manufacturer or relay specification, the increase and decrease of the
energization of the coil shall be performed at a rate not greater than:
• 5 A × turns/ms for saturate value and zero energization;
• 1 A × turns/ms for must-not-release, must-release, must-not-operate, must-operate,
just-release and just-operate values.
Either of the following monitoring procedures (either Procedure 1 or Procedure 2 a or 2 b) may
be used. Standard test coils are given in Clause B.1.
Procedure 1: Contact circuits shall be monitored, throughout the tests, for failure-to-make and
failure-to-break at the appropriate values of test coil energization.
Procedure 2a: Physical opening and closing of the contact shall be monitored throughout the
tests by magnetic induction or other equivalent methods.
a) Saturate: The test coil shall be energized for a specified period to the saturate
value. The contact is then in the operate position.
b) Must-not-release: When specified in the relay specification, the energization
of the coil shall be reduced to the must-not-release value (see Note 1 and
Note 2 at the end of this Subclause A.1.2.1).
c) Must-release: The energization of the coil shall be reduced from the
must-not-release value (or in its absence, the saturate value) to the
must-release value. Unless otherwise prescribed, the release energization
attained shall then be reduced to zero for a minimum period of 20 ms.
d) Must-not-operate: When specified in the relay specification, the energization
of the coil shall be increased from zero to the must-not-operate value (see
Note 1 at the end of this Subclause A.1.2.1).
e) Must-operate: The energization of the coil shall be increased from zero (or
from the must-not-operate value, when specified) to the must-operate value.

– 16 – IEC 63522-7:2025 © IEC 2025
Procedure 2b: Physical opening and closing of the contact shall be monitored throughout the
tests by magnetic induction or other equivalent methods.
a) Saturate: The test coil shall be energized for a specified period to the saturate
value. The contact is then in the operate condition.
b) Zero energization: The energization shall be reduced to zero for a period of
20 ms.
c) Must-not-operate: When specified in the relay specification, the energization
of the coil shall be increased from zero to the must-not-operate value
(see Note 1).
d) Must-operate: The energization of the coil shall be increased from zero (or
from the must-not-operate value, when specified) to the must-operate value.
e) Must-not-release: When specified in the relay specification, the energization
of the coil shall be reduced to the must-not-release value (see Note 1 and
Note 2).
f) Must-release: The energization of the coil shall be reduced from the
must-not-release value (or in its absence, the saturate value) to the must-
release value.
NOTE 1 Must-not-release and must-not-operate tests are optional and are performed only when prescribed in the
detail specification.
NOTE 2 When specified in the relay specification, the functional test for the must-not-release can be replaced by a
similar test performed at the characteristic non-release value.
A.1.2.2 Special procedures for magnetically biased switches
The procedures of A.1.2.1 apply with a rate of 0,1 A × turns/ms for must-not-release, must
release, must-not-operate, must-operate, just-release, and just-operate values.
Either of the following test systems, 1) or 2), may be used (see Clause B.3):
1) Procedure when using test system 1:
a) The central coil M energization shall be zero.
b) The L coil energization shall be increased to the saturate value of the release position
and afterwards decreased to zero.
c) The R coil energization shall be increased from zero to the must-operate value.
d) The R coil energization shall further be increased to the saturate value of the operate
position and afterwards decreased to zero.
e) The L coil energization shall be increased to the must-release value.
2) Procedure when using test system 2:
a) The central coil M energization shall be brought to the saturate value of the operate
position and shall afterwards be decreased to zero.
b) The energization of the coil shall then be increased to the opposite polarity to the release
value and further increased to the saturate value of the release position and afterwards
brought back to zero.
c) The energization of the coil shall be increased in the opposite polarity to the operate
position.
A.1.3 Requirements
Procedure 1: The contact circuit resistance limits for failure-to-make and failure-to-break shall
be complied with.
Procedure 2: Physical opening and closing of the contact shall be within the limits of
must-release, must-not-release, must-operate and must-not-operate.

A.1.4 Information to be stated in the detail specification
The detail specification shall include the following:
a) Test coil (and test system, if applicable),
b) Method of monitoring opening and closing of the contact,
c) Saturate value and period of application,
d) Must-not-release value (if applicable),
e) Must-release value,
f) Must-not-operate value (if applicable),
g) Must-operate value,
h) Characteristic non-release value (if applicable),
i) Failure-to-make (for Procedure 1): contact circuit resistance limit,
j) Failure-to-break (for Procedure 1): contact circuit resistance limit,
k) Time at zero energization if other than 20 ms,
l) Rate of increase and decrease of energization (if applicable).
A.1.5 Influence of magnetic interferences
The following tests are in accordance with IEC 61810-4:2020, 9.4.
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).
For multi-mounting, the test is carried out in accordance with method 2 of IEC 63522-25 to
check the values of functional performance of the relay subjected to the effects of external
magnetic induction from other relays. The mounting grid pattern shall be specified by the
manufacturer. See Figure A.1 for example, all relevant details of the test arrangement (e.g., S :
horizontal mounting distance and S : vertical mounting distance and coil polarity) are to be
indicated in the test report.
The manufacturer shall define, in case of applications with additional influence from surrounding
solenoid (like from filter or switching power supplies inductances), which additional magnetic
influence testing shall be performed.
To cover this, method 1 or 3 (or both) of IEC 63522-25 is recommended.

– 18 – IEC 63522-7:2025 © IEC 2025

Key
1, 2: contact terminals
a, b: coil terminals
S : horizontal mounting distance between relays
S : vertical mounting distance between relays
Figure A.1 – Example of test arrangement for multi-mounting
A.1.6 Railway applications
The following information is in accordance with IEC 61810-4:2020, Clause Q.4. For railway
applications IEC 60571, IEC 60077-1 and IEC 62479 apply.
The railway market requests reliability data including the expected useful life and the
maintenance procedures. When using reed relays to equipment on rolling stock, the system
designer measures and verifies the safety requirements in accordance with the International
Standards on railways in Table A.1.
For the basic operating function of reed relays in railway applications, see A.1.1 to A.1.5.
Table A.1 defines the special tests that shall be used for rolling stock.
The number of DUTs is specified by the manufacturer.

Table A.1 – Special requirements for railway applications – Rolling stock
Item no. Requirements Reference standards
1.1 Basic operating function IEC 60571:2012
(all coil voltages) IEC 60077-1:2017
1.2 Operating ambient temperature IEC 60077-1:2017, Table 1
(all coil voltages) IEC 60571:2012, 5.1.2
1.3 Coil fluctuation range IEC 60571:2012, 4.1.2
(all coil voltages)
1.4 Interruptions of voltage supply IEC 60571:2012, 5.1.1.3
(all coil voltages)
1.5 Overvoltage category: OV1 to OV4 IEC 62497-1:2010, 8.2
(all coil voltages)
2 Fire safety performance Standards or national practices required in the
(if applicable) destination of products
3 Functional random vibration test IEC 61373:2010, Table 1 and Table 2
Simulated long-life testing at increased random
vibration levels
Shock test IEC 61373:2010, Table 3
4 Environmental tests IEC 60077-2:2017, Table 9
IEC 60571:2012, Table 2
IEC 62498-1
5 Reliability tests IEC 61810-2:2017
IEC 61810-2-1:2017
IEC 62246-1:2015, 6.28
A.2 Time relays for industrial and residential use
A.2.1 General
Time relays for industrial and residential use shall be tested in accordance with the following
procedures, in accordance with IEC 61812-1:2023, Clause 10 for also proving functional
stability of switching times.
Prior to the tests, the relays are subjected to the specified atmospheric test conditions so that
they are in thermal equilibrium.
A.2.2 Operate
The relay shall be preconditioned at the maximum permissible ambient temperature specified
by the manufacturer by applying – as indicated by the manufacturer – the rated input voltage,
or the upper limit of the rated input voltage range, and with the contacts (contact set) loaded
with the maximum continuous current(s) specified by the manufacturer for this test until thermal
equilibrium is reached. Immediately after removal of the input voltage and related arrival at the
release condition, the relay shall operate again when energized at the lower limit of the
operative range.
A.2.3 Release
The relays shall reach thermal equilibrium at the minimum permissible ambient temperature.
After a short application of the operate voltage to establish the operate condition, the coil
voltage shall be immediately reduced to the relevant release value as specified.
When this occurs, the relay shall release.

– 20 – IEC 63522-7:2025 © IEC 2025
A.2.4 Time function
A.2.4.1 Functional test at reference values of input quantities
A.2.4.1.1 General
The functional tests are to be carried out with the reference values of the input quantities as
given in IEC 61812-1:2023, Table 1. The number of successive measurements shall be 10
minimum.
A.2.4.1.2 Determination of the setting accuracy
The difference between the mean of the measured values and the setting value shall be within
the tolerances of the setting accuracy indicated by the manufacturer.
A.2.4.1.3 Determination of the repeatability
The difference between the mean of the measured values and the measured values shall be
within the tolerances of the repeatability indicated by the manufacturer.
A.2.4.2 Influencing effects of voltage and temperature
The influencing effect of the input voltage and temperature on the specified time(s) is checked;
for this purpose, only one quantity as given in Table A.2 will be changed whereas the other
quantity has the nominal value.
The number of successive measurements shall be 10 minimum.
For checking the influence on temperature, the relays are operated in an appropriate chamber
until thermal equilibrium is attained at the ambient temperature as given in Table A.2. Thermal
equilibrium is attained when variation of less than 1 K occurs between any two out of three
consecutive measurements made at an interval of 5 min.
The test shall be considered satisfactory if the relay accomplishes its function properly within
the tolerance values as indicated by the manufacturer.
Table A.2 – Changing of influencing quantities
Changed quantity Value Tolerance unit
Input voltage 110 % and %/volt
80 % or
85 % or
90 %
Ambient temperature −5 °C %/K
+40 °C
A.3 Solid-state relays
A.3.1 General
Solid-state relays shall be tested also as follows for their basic operating function, in accordance
with IEC 62314:2022, Clause 9.

A.3.2 OFF-state leakage current measurement
The OFF-state leakage current shall be measured at rated operational voltage. Measurement
inaccuracies shall be taken into account when evaluating the results. If not specified by the
detailed specification, all measurements shall be taken with an accuracy of ±2 %. The result
shall be lower than the specified value.
A.3.3 ON-state voltage drop measurement
The ON-state voltage drop shall be measured at rated operational current. Measurement
inaccuracies shall be taken into account when evaluating the results. If not otherwise specified,
all measurements shall be taken with an accuracy of ±2 %. The result shall be lower than the
specified value.
A.4 Relays with forcibly guided (mechanically linked) contacts
A.4.1 General
Relays with forcibly guided (mechanically linked) contacts shall be tested as follows for the
forcibly guided operation function, in accordance with IEC 61810-3:2015.
A.4.2 Functional requirements
The relay shall be designed such that if a make contact is closed, none of the mechanically
linked break contacts can close and that if a break contact is closed, none of the mechanically
linked make contacts can close. These requirements apply throughout the lifetime of the relay
and under reasonably foreseeable failure c
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