prEN IEC 63522-0:2025

SLOVENSKI STANDARD
oSIST prEN IEC 63522-0:2024
01-junij-2024
Električni releji - Preskusi in meritve - 0. del: Splošno in smernice
Electrical relays - Tests and Measurements - Part 0: General and Guidance
Ta slovenski standard je istoveten z: prEN IEC 63522-0:2024
ICS:
29.120.70 Releji Relays
oSIST prEN IEC 63522-0:2024 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 63522-0:2024
oSIST prEN IEC 63522-0:2024
94/990/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63522-0 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-04-26 2024-07-19
SUPERSEDES DOCUMENTS:
94/963/CD, 94/982/CC
IEC TC 94 : ELECTRICAL RELAYS
SECRETARIAT: SECRETARY:
Austria Mr Bernhard Spalt
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses to
be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC c lauses.
(SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Electrical relays - Tests and Measurements - Part 0: General and Guidance

PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:
file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You may not copy
or "mirror" the file or printed version of the document, or any part of it, for any other purpose without permission in writi ng from
IEC.
oSIST prEN IEC 63522-0:2024
94/990/CDV – 2 – IEC CDV 63522-0 © IEC 2024
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
3.1 Types of relays . 9
3.2 Types of relays, based upon environmental protection (relay technology RT) . 9
3.3 Functions of a relay . 10
3.4 Types of contacts . 11
3.5 Prefixes for the values applicable to relays . 12
3.6 Energization values . 12
3.7 Electrical properties of contacts . 14
3.8 Contact load categories . 15
3.9 Mechanical properties of contacts . 15
3.10 Terms relating to times . 16
3.11 Terms and definitions related to general terms . 17
3.12 Terms and definitions related to inspection . 19
4 General provisions for testing . 20
4.1 General . 20
4.2 Deviations . 20
4.3 Precision of measurement . 20
4.4 Reference conditions for testing . 20
4.5 Number of test samples . 21
4.6 Usage of suppression devices . 21
4.7 Cross sectional . 22
4.8 Torque . 24
5 Test report . 24
Annex A (normative) Test circuit . 26
A.1 General . 26
A.2 Description and requirements . 28
A.2.1 Power source . 28
A.2.2 Switching (coil control) device . 29
A.2.3 Control device . 29
A.2.4 Measuring and indicating device . 29
Annex B (normative) Contact Load Category . 31
B.1 Contact load categories (CC) . 31
Annex C (informative) Duty type . 32
C.1 Duty types . 33
C.1.1 Duty type S1 – Continuous running duty . 33
C.1.2 Duty type S2 – Short-time duty . 34
C.1.3 Duty type S3 – Intermittent periodic duty . 35
C.1.4 Duty type S4 – Intermittent periodic duty with starting . 36
C.1.5 Duty type S5 – Intermittent periodic duty with “electric braking” . 37
C.1.6 Duty type S6 – Continuous operation periodic duty . 38
C.1.7 Duty type S7 – Continuous operation periodic duty with electric braking . 39
Annex T (normative) Test report . 40

oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 3 – 94/990/CDV
Bibliography . 41

Figure A.1 – Standard test circuit . 26
Figure A.2 – Functional block diagram . 27
Figure A.3 – Contact measuring timing . 29
Figure A.4 – Electrical endurance test circuit example . 30
Figure B.1 – Contact load categories . 31
Figure C.1 - Continuous running duty - Duty type S1 . 33
Figure C. 2 - Short-time duty - Duty type S2. 34
Figure C. 3 - Intermittent periodic duty – Duty type S3 . 35
Figure C. 4 - Intermittent periodic duty with starting – Duty type S4 . 36
Figure C. 5 - Intermittent periodic duty with electric braking – Duty type S5 . 37
Figure C. 6 - Continuous operation periodic duty – Duty type S6 . 38
Figure C. 7 – Continuous operation periodic duty with electric braking – Duty type S7 . 39

Table 1 – Table of all related standards . 6
Table 2 - Reference values of influence quantities . 21
Table 3 Cross-sectional areas and lengths of conductors dependent on the current
carried by the terminal . 22
Table 4 - Test conductor for test current above 400 A and up to 800 A inclusive
dependent on the current carried by the terminal . 23
Table 5 - Test copper bars for test current above 400 A and up to 1 000 A inclusive
dependent on the current carried by the terminal . 23
Table 6 - Relationship between torque and nominal diameter of thread . 24
Table A.1 – Characteristics of power sources for contact loads . 27
Table A.2 – Standard contact load characteristics . 28

oSIST prEN IEC 63522-0:2024
94/990/CDV – 4 – IEC CDV 63522-0 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Electrical Relays –
Tests and measurements
Part 0: Testing - General and Guidance

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 p romote 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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
The International Standards of the IEC 61810 have been prepared by IEC technical committee
94: All-or-nothing electrical relays.
The text of this International Standard is based on the following documents:
CD CC
94/963/CD 94/982/CC
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 61810 series, published under the general title Electromechanical
elementary relays, can be found on the IEC website.

oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 5 – 94/990/CDV
This International Standard is to be used in conjunction with IEC 61810-1:2015.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
oSIST prEN IEC 63522-0:2024
94/990/CDV – 6 – IEC CDV 63522-0 © IEC 2024
2 Electrical Relays –
3 Tests and measurements
5 Part 0: General and Guidance
9 1 Scope
10 This document includes a series of methods for testing along with their appropriate severities
11 and conditions for measurements and tests designed to assess the ability of specimens to
12 perform under expected conditions of transportation, storage and all aspects of operational use.
13 This part of IEC 63522 series specifies the general condition conditions to be applied for all
14 testing if not otherwise specified and provide general guidance to be used in conjunction with
15 all other IEC 63522 parts.
16 Table 1 – Table of all related standards
Part Title
IEC 63522-0 General and Guidance
IEC 63522-1 Visual inspection and check of dimensions
IEC 63522-2 Mechanical tests and weighting
IEC 63522-3 Relay coil properties
IEC 63522-4 Dielectric strength test
IEC 63522-5 Insulation resistance
IEC 63522-6 Contact-circuit resistance (or voltage drop)
IEC 63522-7 Functional tests
IEC 63522-8 Timing Test
IEC 63522-9 Climatic tests
IEC 63522-10 Heating
IEC 63522-11 Enclosure Protection and Degree of Protection
IEC 63522-12 Internal moisture
IEC 63522-13 Corrosive atmospheres –Corrosive atmospheres due to sulfur impact
IEC 63522-14 Mould growth
IEC 63522-15 Robustness of terminals
IEC 63522-16 Soldering
IEC 63522-17 Shock, Acceleration and Vibration,
IEC 63522-18 Thermal resistance of the coil heating
IEC 63522-19 Electrical Endurance
IEC 63522-20 Mechanical Endurance
IEC 63522-21 Thermal Endurance
IEC 63522-22 Limiting continuous current
oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 7 – 94/990/CDV
IEC 63522-24 Load transfer
IEC 63522-25 Magnetic interference
IEC 63522-26 Crosstalk and insertion loss
IEC 63522-27 Electrical contact noise
IEC 63522-28 Thermoelectric electromotive force (e.m.f.)
IEC 63522-29 Capacitance
IEC 63522-30 Contact sticking (delayed release)
IEC 63522-31 Magnetic remanence
IEC 63522-32 Acoustic noise
IEC 63522-33 Continuity of protective earth connection
IEC 63522-34 Fluid contamination
IEC 63522-35 Resistance to cleaning solvents
IEC 63522-36 Fire hazard
IEC 63522-37 Teminal temperature rise at rated load
IEC 63522-38 Mechanical interlock
IEC 63522-39 Insertion and withdrawal force
IEC 63522-40 Short circuit testing
IEC 63522-41 Insulation coordination
EC 63522-42 EMC
IEC 63522-43 Prof tracking index (PTI)
IEC 63522-44 Corrosive atmosphere - Salt mist
IEC 63522-45 Maximum frequency of operation
IEC 63522-46 Impulse voltage test
IEC 63522-48 Contact failure rate test
IEC 63522-49 Long term stability of sealing
IEC 63522-52 Coil overvoltage
IEC 63522-54 Critical DC load current
IEC 63522-55 Maximum DC load breaking capacity
IEC 63522-56 Ball Pressure Test

19 2 Normative references
20 The following documents are referred to in the text in such a way that some or all of their content
21 constitutes requirements of this document. For dated references, only the edition cited applies.
22 For undated references, the latest edition of the referenced document (including any
23 amendments) applies.
24 IEC 60028, International standard of resistance for copper

oSIST prEN IEC 63522-0:2024
94/990/CDV – 8 – IEC CDV 63522-0 © IEC 2024
25 IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test
26 requirements
27 IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature
28 IEC 60068-2-17, Basic environmental testing procedures – Part 2-17: Tests – Test Q: Sealing
29 IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
30 IEC 60068-2-64:2008, Environmental testing – Part 2-64: Tests – Test Fh: Vibration, broadband
31 random and guidance
32 IEC 60270, High-voltage test techniques – Partial discharge measurements
33 IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
34 Principles, requirements and tests
35 IEC 60664-3:2016, Insulation coordination for equipment within low-voltage systems – Part 3:
36 Use of coating, potting or moulding for protection against pollution
37 IEC 60721-3-3:2019, Classification of environmental conditions – Part 3-3: Classification of
38 groups of environmental parameters and their severities – Stationary use at weatherprotected
39 locations
40 IEC 60947-1:2020, Low-voltage switchgear and controlgear – Part 1: General rules
41 IEC 60999-1, Connecting devices – Electrical copper conductors – Safety requirements for
42 screw-type and screwless-type clamping units – Part 1: General requirements and particular
2 2
43 requirements for clamping units for conductors from 0,2 mm up to 35 mm (included)
44 IEC 60999-2, Connecting devices – Electrical copper conductors – Safety requirements for
45 screw-type and screwless-type clamping units – Part 2: Particular requirements for clamping
2 2
46 units for conductors above 35 mm up to 300 mm (included)
47 IEC 61810-1:2015, Electromechanical elementary relays – Part 1: General and safety
48 requirements
49 ISO 16750-1:2018, Road vehicles – Environmental conditions and testing for electrical and
50 electronic equipment – Part 1: General
51 ISO 16750-2:2012, Road vehicles – Environmental conditions and testing for electrical and
52 electronic equipment – Part 2: Electrical loads
53 3 Terms and definitions
54 For the purposes of this document, the following terms and definitions apply for the entire
55 IEC 63522 series.
56 ISO and IEC maintain terminological databases for use in standardization at the following
57 addresses:
58 • IEC Electropedia: available at http://www.electropedia.org/
59 • ISO Online browsing platform: available at http://www.iso.org/obp
60 NOTE In the text of this document, the term "relay" is used instead of "elementary relay" to improve the readability.

oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 9 – 94/990/CDV
61 3.1 Types of relays
62 3.1.1
63 electromechanical relay
64 electrical relay in which the intended response results mainly from the movement of mechanical
65 elements
66 [IEV 444-01-04]
67 3.1.2
68 all-or-nothing relay
69 electrical relay, which is intended to be energized by a quantity, the value of which is either
70 within its operative range or effectively zero
71 [IEV 444-01-02]
72 3.1.3
73 elementary relay
74 all-or-nothing relay which operates and releases without any intentional time delay
75 [IEV 444-01-03]
76 3.1.4
77 monostable relay
78 electrical relay which, having responded to an energizing quantity and having changed its
79 condition, returns to its previous condition when that quantity is removed
80 [IEV 444-01-07]
81 3.1.5
82 bistable relay
83 electrical relay which, having responded to an energizing quantity and having changed its
84 condition, remains in that condition after the quantity has been removed; a further appropriate
85 energization is required to make it change its condition
86 [IEV 444-01-08]
87 3.1.6
88 polarized relay
89 electrical relay, the change of condition of which depends upon the polarity of its DC energizing
90 quantity
91 [IEV 444-01-09]
92 3.1.7
93 non-polarized relay
94 electrical relay, the change of condition of which does not depend upon the polarity of its
95 energizing quantity
96 [IEV 444-01-10]
97 3.2 Types of relays, based upon environmental protection (relay technology RT)
98 3.2.1
99 RT 0 unenclosed relay
100 relay not provided with a protective case
101 3.2.2
102 RT I dust protected relay
103 relay provided with a case which protects its mechanism from dust

oSIST prEN IEC 63522-0:2024
94/990/CDV – 10 – IEC CDV 63522-0 © IEC 2024
104 3.2.3
105 RT II flux proof relay
106 relay capable of being automatically soldered without allowing the migration of solder fluxes
107 beyond the intended areas
108 NOTE Where an enclosed construction is used, venting to the outside atmosphere is permissible.
109 3.2.4
110 RT III wash tight relay
111 relay capable of being automatically soldered and subsequently undergoing a washing process
112 to remove flux residues without allowing the ingress of flux or washing solvents
113 NOTE In service, this type of relay is sometimes vented to the atmosphere after the soldering or washing process.
114 3.2.5
115 RT IV sealed relay
116 relay provided with a case which has no venting to the outside atmosphere, and having a time
117 constant better than 2  10 s (see IEC 60068-2-17)
118 3.2.6
119 RT V hermetically sealed relay
120 sealed relay having an enhanced level of sealing, assuring a time constant better than
121 2  10 s (see IEC 60068-2-17)
122 3.3 Functions of a relay
123 3.3.1
124 release condition
125 for a monostable relay, specified condition of the relay when it is not energized; for a bistable
126 relay, one of the conditions, as declared by the manufacturer
127 [IEV 444-02-01]
128 3.3.2
129 operate condition
130 for a monostable relay, specified condition of the relay when it is energized by the specified
131 energizing quantity and has responded to that quantity; for a bistable relay, the condition other
132 than the release condition as declared by the manufacturer
133 [IEV 444-02-02]
134 3.3.3
135 operate (verb)
136 set (for bistable relays only)
137 change from the release condition to the operate condition
138 [IEV 444-02-04]
139 3.3.4
140 release (verb)
141 for a monostable relay, change from the operate condition to the release condition
142 [IEV 444-02-05]
143 3.3.5
144 reset (verb)
145 for a bistable relay, change from the operate condition to the release condition
146 [IEV 444-02-06]
oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 11 – 94/990/CDV
147 3.3.6
148 change over (verb)
149 for a monostable relay, operate or release; for a bistable relay, operate or reset
150 [IEV 444-02-07]
151 3.3.7
152 cycle (verb)
153 for a monostable relay, operate and then release or vice versa; for a bistable relay, operate and
154 then reset or vice-versa
155 [IEV 444-02-08]
156 3.3.8
157 revert (verb)
158 for a specific type of polarized relay, release/reset again, or remain in the release condition,
159 when supplied with a coil voltage in excess of that required for operation and of the same
160 polarity as required for operation
161 [IEV 444-02-09, modified]
162 3.3.9
163 revert reverse (verb)
164 for a specific type of polarized bistable relay, operate again, or remain in the operate condition,
165 when supplied with a coil voltage in excess of that required for resetting and of the same polarity
166 as required for resetting
167 [IEV 444-02-10, modified]
168 3.4 Types of contacts
169 3.4.1
170 make contact (NO)
171 contact which is closed when the relay is in its operate condition and which is open when the
172 relay is in its release condition
173 [IEV 444-04-17]
174 3.4.2
175 break contact (NC)
176 contact which is open when the relay is in its operate condition and which is closed when the
177 relay is in its release condition
178 [IEV 444-04-18]
179 3.4.3
180 change-over contact (CO)
181 combination of two contact circuits with three contact members, one of which is common to the
182 two contact circuits; such that when one of these contact circuits is open, the other is closed
183 [IEV 444-04-19]
184 3.4.4
185 change-over make-before-break contact (CObNC)
186 change-over contact in which the make contact circuit closes before the break contact circuit
187 opens
188 [IEV 444-04-20]
oSIST prEN IEC 63522-0:2024
94/990/CDV – 12 – IEC CDV 63522-0 © IEC 2024
189 3.4.5
190 change-over break-before-make contact (CObNO)
191 change-over contact in which the break contact circuit opens before the make contact circuit
192 closes
193 [IEV 444-04-21]
194 3.5 Prefixes for the values applicable to relays
195 3.5.1
196 rated value
197 value of a quantity used for specification purposes, established for a specified set of operating
198 conditions of a relay
199 [IEV 444-02-18, modified]
200 3.5.2
201 actual (“just”) value
202 value of a quantity determined by measurement on a specific relay, during performance of a
203 specified function
204 [IEV 444-02-21, modified]
205 3.5.3
206 test (“must”) value
207 value of a quantity for which the relay shall comply with a specified action during a test
208 [IEV 444-02-20, modified]
209 3.5.4
210 characteristic value
211 value of a quantity with which, in the initial condition of a relay or for a specified number of
212 cycles as specified, the relay shall comply with a specified requirement
213 [IEV 444-02-19, modified]
214 3.6 Energization values
215 3.6.1
216 energizing quantity
217 electrical quantity which, when applied to the coil(s) of a relay under specified conditions,
218 enables it to fulfil its purpose
219 [IEV 444-03-01, modified]
220 NOTE 1 For elementary relays, the energizing quantity is usually a voltage. Therefore, the input voltage as
221 energizing quantity is used in the definitions given below. When a relay is energized by a given current instead, the
222 respective terms and definitions apply with “current” used instead of “voltage”.
223 NOTE 2 The general term “input voltage” used in IEV Chapter 444 applies to all types of elementary relays (e.g.
224 including solid-state relays). For electromechanical elementary relays the more specific term “coil voltage” has been
225 chosen for the terms of 3.6, as in IEC 61810-1.
226 3.6.2
227 coil voltage
228 voltage applied as an energizing quantity
229 [IEV 444-03-03]
230 3.6.3
231 operative range
232 range of values of coil voltage for which a relay is able to perform its specified function

oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 13 – 94/990/CDV
233 [IEV 444-03-05, modified]
234 NOTE For the following terms, refer also to Figures 3 to 7 which show the sequential functions of relays covered by
235 the definitions.
236 3.6.4
237 magnetic preconditioning value
238 value of the coil voltage at which the relay attains a defined magnetic condition
239 [IEV 444-03-19]
240 NOTE 1 For polarized relays, distinction is made between preconditioning in forward (operate) direction, and
241 preconditioning in reverse direction.
242 NOTE 2 For bistable relays, preconditioning may also be used to set the relay to a defined position.
243 3.6.5
244 non-operate voltage
245 value of the coil voltage at which a relay does not operate
246 [IEV 444-03-07, modified]
247 3.6.6
248 operate voltage, set voltage (for bistable relays only)
249 value of the coil voltage at which a relay operates
250 [IEV 444-03-06, modified]
251 3.6.7
252 non-release voltage
253 value of the coil voltage at which a monostable relay does not release
254 [IEV 444-03-09, modified]
255 3.6.8
256 release voltage
257 value of the coil voltage at which a monostable relay releases
258 [IEV 444-03-08, modified]
259 3.6.9
260 non-reset voltage
261 value of the coil voltage at which a bistable relay does not reset
262 [IEV 444-03-11, modified]
263 3.6.10
264 reset voltage
265 value of the coil voltage at which a bistable relay resets
266 [IEV 444-03-10, modified]
267 3.6.11
268 revert voltage
269 for a specific type of polarized relay, value of the coil voltage greater than and with the same
270 polarity as the operate voltage, at which the relay reverts
271 [IEV 444-03-12, modified]
oSIST prEN IEC 63522-0:2024
94/990/CDV – 14 – IEC CDV 63522-0 © IEC 2024
272 3.6.12
273 non-revert voltage
274 for a specific type of polarized relay, value of the coil voltage greater than and with the same
275 polarity as the operate voltage, at which the relay does not revert
276 [IEV 444-03-13, modified]
277 3.6.13
278 revert reverse voltage
279 for a specific type of polarized bistable relay, value of the coil voltage greater than and with the
280 same polarity as the reset voltage, at which the relay reverts reverse
281 [IEV 444-03-14, modified]
282 3.6.14
283 non-revert reverse voltage
284 for a specific type of polarized bistable relay, value of the coil voltage greater than and with the
285 same polarity as the reset voltage, at which the relay does not revert reverse
286 [IEV 444-03-15, modified]
287 3.6.15
288 reverse polarity voltage
289 for a polarized monostable relay, value of the coil voltage of reverse polarity at which the relay
290 does not operate
291 [IEV 444-03-16, modified]
292 3.6.16
293 active power
294 under periodic conditions, mean value, taken over one period T, of the instantaneous power p:
T
P= 1 T p dt

296 NOTE 1 Under sinusoidal conditions, the active power is the real part of the complex power.
297 NOTE 2 The SI unit for active power is the watt.
298 [IEV 131-11-42]
299 3.6.17
300 apparent power
301 product of the r.m.s. voltage U between the terminals of a two-terminal element or two-terminal
302 circuit and the r.m.s. electric current I in the element or circuit:
303 S = UI
304 NOTE 1 Under sinusoidal conditions, the apparent power is the modulus of the complex power.
305 NOTE 2 The SI unit for apparent power is the voltampere.
306 [IEV 131-11-41]
307 3.7 Electrical properties of contacts
308 3.7.1
309 contact current
310 electric current which a relay contact carries before opening or after closing

oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 15 – 94/990/CDV
311 [IEV 444-04-26]
312 3.7.2
313 switching current
314 electric current which a relay contact makes and/or breaks
315 [IEV 444-04-27]
316 3.7.3
317 switching voltage
318 voltage between the contact members before closing or after opening of a relay contact
319 [IEV 444-04-25, modified]
320 3.7.4
321 limiting continuous current
322 greatest value of electric current which a closed contact is capable of carrying continuously
323 under specified conditions
324 [IEV 444-04-28, modified]
325 3.7.5
326 contact noise
327 spurious voltage which appears across the terminals of a closed contact
328 [IEV 444-04-33]
329 3.8 Contact load categories
330 3.8.1
331 contact load category 0
332 CC 0
333 load characterized by a maximum switching voltage of 30 mV and a maximum switching current
334 of 10 mA
335 3.8.2
336 contact load category 1
337 CC 1
338 low load without contact arcing
339 NOTE Arcing with a duration of up to 1 ms is disregarded.
340 3.8.3
341 contact load category 2
342 CC 2
343 high load where contact arcing can occur
344 3.9 Mechanical properties of contacts
345 3.9.1
346 contact tip
347 contact point
348 part of a contact member at which the contact circuit opens or closes
349 [IEV 444-04-06]
350 3.9.2
351 contact gap
352 gap between the contact tips (points) when the contact circuit is open

oSIST prEN IEC 63522-0:2024
94/990/CDV – 16 – IEC CDV 63522-0 © IEC 2024
353 [IEV 444-04-09, modified]
354 3.9.3
355 contact force
356 force which two contact members exert against each other at their contact tips (points) in the
357 closed position
358 [IEV 444-04-10, modified]
359 3.9.4
360 contact member
361 conductive part designed to co-act with another to close or open the contact
362 [IEV 444-04-05, modified]
363 3.10 Terms relating to times
365 unnecessary delay
366 Operation without any delay which is not required to fulfil the intended task
367 NOTE The necessary handling process should not generate any influence on the results .
368 NOTE Possibly, this unnecessary delay definition could lead to a handling process evaluation.
370 3.10.1
371 operate time
372 set time (for bistable relays only)
373 time interval between the application of the specified coil voltage to a relay in the release
374 condition and the change of state of the last contact circuit, bounce time not included
375 [IEV 444-05-01, modified]
376 NOTE The operate time covers the closing time of a make contact, and the opening time of a break contact.
377 3.10.2
378 release time
379 time interval between the removal of the specified coil voltage from a monostable relay in the
380 operate condition and the change of state of the last contact circuit, bounce time not included
381 [IEV 444-05-02, modified]
382 NOTE The release time covers the opening time of a make contact and the closing time of a break contact.
383 3.10.3
384 reset time
385 time interval between the application of the specified coil voltage to a bistable relay in the
386 operate condition and the change of state of the last contact circuit, bounce time not included
387 [IEV 444-05-03, modified]
388 NOTE The reset time covers the opening time of a make contact and the closing time of a break contact.
389 3.10.4
390 bounce time
391 for a contact which is closing/opening its circuit, time interval between the instant when the
392 contact circuit first closes/opens and the instant when the circuit is finally closed/opened

oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 17 – 94/990/CDV
393 [IEV 444-05-04]
394 3.10.5
395 transfer time; transit time
396 for a change-over break-before-make contact, time interval during which both contact circuits
397 are open
398 [IEV 444-05-06]
399 3.10.6
400 bridging time
401 for a change-over make-before-break contact, the time interval during which both contact
402 circuits are closed
403 [IEV 444-05-05]
404 3.10.7
405 stabilization time
406 time interval between the instant when a specified coil voltage is applied and the instant when
407 the last contact circuit is closed/opened and fulfils the specified requirements, bounce time
408 included
409 [IEV 444-05-07, modified]
410 3.10.8
411 minimum time of energization
412 minimum duration of application of the coil voltage to ensure that the relay operates or resets
413 [IEV 444-05-08, modified]
414 3.10.9
415 contact time difference
416 for a relay having several contacts of the same type, difference between the maximum value of
417 the operate (release/reset) time and the minimum value of the operate (release/reset) time
419 unnecessary delay
420 Operation without any delay which is not required to fulfil the intended task
421 NOTE Due to a necessary handling process should be no result influence generated.
422 NOTE Possibly, this unnecessary delay definition could lead to a handling process evaluation.
424 start time
425 moment, where an intended operation begins
426 NOTE It is the time were the time measurement starts (for instance: applying the dielectric strength value).
427 3.11 Terms and definitions related to general terms
429 Device under test (DUT)
430 DUT is the abbreviation for Device Under Test and commonly used to many product and/or
431 component undergoing testing
432 NOTE DUT has the same meaning as test samples and many other and will replaces all of them in terms of testing
433 standards.
oSIST prEN IEC 63522-0:2024
94/990/CDV – 18 – IEC CDV 63522-0 © IEC 2024
434 NOTE The meaning of device in conjunction with standards of TC 94 stands for any component and device covered
435 by the scope TC 94. E.g. Relays. SSR, Read Contacts aso….
437 Specimen
438 a limited quantity of something which is intended to be similar to and represent a larger
439 amount
440 NOTE Specimen is used most likely in combination with material testing like ball pressure or GWFI test.
442 coil transient suppression device
443 device connected to the relay coil to limit its back electromotive force (e.m.f.) to a prescribed
444 value
446 thermal equilibrium
447 state reached when the temperature of the parts of a component or equipment operating in a
448 given environment no longer varies faster than a gradient of 2K
449 NOTE For (heavy) DUT it is recommended to monitor permanently (plot) the temperature rise for estimation of the
450 thermal equilibrium.
451 NOTE A temperature rise is considered to be constant when three successive readings that are taken at intervals
452 of not less than 15 minutes indicate no change between any two of three consecutive readings of more than a gradient
453 of 2K.
454 [SOURCE: IEC 60050-151:2002, 151-16-33, modified – modification of the definition – two
455 notes added]
457 Steady-state (Steady) conditions
458 state of a system at which all state and output variables remain constant in time while all input
459 variables are constant.
460 [IEV 351-45-10]
462 Ambient conditions
463 Environmental conditions
464 characteristic of the environment which may affect performance of a DUT
465 Note – Examples of ambient conditions are pressure, temperature, humidity, radiation, vibration.
466 [IEV 151-16-03, modified]
468 Ambient temperature
469 Environmental temperature
470 temperature of the air or other medium within the proximity of a DUT
471 NOTE It is possible that different ambient temperatures are measured within the proximity of the relay.
473 Initial value
474 characteristic measured at the beginning of a test and after a stabilization time to reach e.g
475 thermal equilibrium.
oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 19 – 94/990/CDV
477 duty types
478 a continuous, short-time or periodic duty, comprising one or more loads remaining constant for
479 the duration specified or a non-periodic duty in which generally load and speed vary within the
480 permissible operating range.
481 [IEV 411-51-13]
482 3.12 Terms and definitions related to inspection
484 inspection
485 inspection by eye to verify that there are no apparent discrepancies with respect to provisions
486 of the product specification and/ or requirement
488 initial inspection
489 inspection of all samples in regard to correctness of marking, terminal identification and correct
490 housing (outside parts) before they are brought into test
492 visual inspection
493 inspection that identifies, without the use of access equipment or tools, those observations /
494 defects, such as melted / deformed enclosures, which will be apparent to the eye
496 detail inspection
497 inspection that encompasses those aspects covered by a visual inspection and, in addition,
498 identifies those defects, such as loose terminations or inside thermal stressed parts, which will
499 only be apparent by opening the enclosure, and/or using, where necessary, tools and other
500 equipment
oSIST prEN IEC 63522-0:2024
94/990/CDV – 20 – IEC CDV 63522-0 © IEC 2024
502 4 General provisions for testing
503 4.1 General
504 The test and measurement procedures specified in this part of IEC 63522 series are
505 recommended to be used for the testing of parameters given for a relay.
506 4.2 Deviations
507 Any test and measurement procedures deviating from those given in this standard may be
508 applied but shall be indicated in the documentation of the relay and stated in the test report.
509 4.3 Precision of measurement
510 Measurement uncertainty shall be taken into account when evaluating the results. If not
511 otherwise specified, all measurements shall be taken with following accuracy:
512 1) Electrical ±2 %
513 2) Mechanical ±5 %
514 3) Timing ±10 %
515 4) Temperatures ±2 K
516 4.4 Reference conditions for testing
517 Unless otherwise specified, all tests shall be carried out under reference conditions for testing
518 as follows:
oSIST prEN IEC 63522-0:2024
IEC CDV 63522-0 © IEC 2024 – 21 – 94/990/CDV
519 Table 2 - Reference values of influence quantities
Tolerance range and conditions
Influence quantity Reference value

a
for testing
Ambient temperature 23 °C 5 K
Atmospheric pressure 96 kPa 86 kPa to 106 kPa
Relative humidity 50 % 25 % to 75 %
–4
External magnetic induction 0
0  5  10 T in any direction
Position As indicated by the According to clause 5.2 of IEC 63522-10
manufacturer
Voltage/current (for coil and load) As indicated by the
5 % for steady-state conditions
manufacturer
Frequency 16 / Hz or
...