IEC 61811-51:2002

IEC 61811-51 ®
Edition 2.0 2002-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electromechanical all-or-nothing relays –
Part 51: Blank detail specification – Electromechanical all-or-nothing telecom
relays of assessed quality – Non-standardized types and construction

Relais électromécaniques de tout-ou-rien –
Partie 51: Spécification particulière cadre – Relais électromécaniques de tout-
ou-rien télécom sous assurance de la qualité – Types et construction non
normalisés
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IEC 61811-51 ®
Edition 2.0 2002-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electromechanical all-or-nothing relays –

Part 51: Blank detail specification – Electromechanical all-or-nothing telecom

relays of assessed quality – Non-standardized types and construction

Relais électromécaniques de tout-ou-rien –

Partie 51: Spécification particulière cadre – Relais électromécaniques de tout-

ou-rien télécom sous assurance de la qualité – Types et construction non

normalisés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 29.120.70 ISBN 978-2-8322-1548-7

– 2 – IEC 61811-51:2002 © IEC 2002
CONTENTS
FOREWORD . 3

1 General . 5
1.1 Scope . 5
1.2 Normative references . 5
1.3 Front page of the detail specification . 7
2 Characteristic values of the relay . 8
2.1 General data . 8
2.2 Construction of IECQ type designation (ordering information) . 9
2.3 Coil data. 9
2.4 Contact data . 10
2.4.1 Electrical endurance and switching frequency . 10
2.4.2 Static contact-circuit resistance . 10
2.4.3 Mechanical endurance . 10
2.4.4 Timing (without suppression device) . 10
2.5 Mounting . 11
2.6 Environmental data . 11
2.7 Package of relays for automatic handling (if applicable) . 11
3 Qualification approval procedures . 11
4 Quality conformance inspection . 11
4.1 Formation of inspection lots . 12
4.2 Intervals between tests . 12
5 Marking and documentation . 12
5.1 Marking of the relay . 12
5.2 Marking of the package . 12
5.3 Documentation . 12
6 Annexes . 13
7 Tests . 13
7.1 Standard conditions for testing . 13
7.2 Mounting of test specimens during the test . 13
7.3 General conditions for testing . 13
8 Ordering information . 13
9 Relay reliability – failure rate data (optional) . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMECHANICAL ALL-OR-NOTHING RELAYS –

Part 51: Blank detail specification –
Electromechanical all-or-nothing telecom relays of assessed quality –
Non-standardized types and construction

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form of
standards, technical specifications, technical reports or guides and they are accepted by the National Committees
in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any divergence
between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the
latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61811-51 has been prepared by IEC technical committee 94:
All-or-nothing electrical relays.
This bilingual version (2014-04) corresponds to the English version, published in 2002-03.
This second edition of IEC 61811-51 cancels and replaces the first edition published in 1997 and
constitutes a technical revision.

– 4 – IEC 61811-51:2002 © IEC 2002
The text of this standard is based on the following documents:
FDIS Report on voting
94/145/FDIS 94/159/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
The QC number that appears on the front cover of this publication is the specification number in
the IEC Quality Assessment System for Electronic Components (IECQ).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
The committee has decided that the contents of this publication will remain unchanged until 2007. At
this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
ELECTROMECHANICAL ALL-OR-NOTHING RELAYS –

Part 51: Blank detail specification –
Electromechanical all-or-nothing telecom relays of assessed quality –
Non-standardized types and construction

1 General
1.1 Scope
This part of IEC 61811 is a blank detail specification applicable to electromechanical
all-or-nothing telecom relays of assessed quality. Relays according to this standard are
provided for operation in telecommunication applications. However, as electromechanical
all-or-nothing relays, they are also suitable for particular industrial and other applications.
This standard selects from IEC 61810-7 and other sources the appropriate methods of test
to be used in detail specifications derived from this specification, and contains basic test
schedules to be used in the preparation of such specifications in accordance with IEC 61811-1.
1.2 Normative references
The following referenced documents are indispensable for the application 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 60068-1:1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)
IEC 60068-2-17:1994, Environmental testing – Part 2: Tests – Test Q: Sealing
IEC 60068-2-20:1979, Environmental testing – Part 2: Tests – Test T: Soldering
Amendment 2 (1987)
IEC 60068-2-47:1999, Environmental testing – Part 2-47: Test methods – Mounting of
components, equipment and other articles for vibration, impact and similar dynamic tests
IEC 60255-14:1981, Electrical relays – Part 14: Endurance test for electrical relay contacts –
Preferred values for contact loads
IEC 60695-2-2:1991, Fire hazard testing – Part 2: Test methods – Section 2: Needle-flame test
IEC 61709:1996, Electronic components – Reliability – Reference conditions for failure rates
and stress models for conversion

– 6 – IEC 61811-51:2002 © IEC 2002
IEC 61810-7:1997, Electromechanical all-or-nothing relays – Part 7: Test and measurement
procedures
IEC 61811-1:1999, Electromechanical non-specified time all-or-nothing relays of assessed
quality – Part 1: Generic specification
IEC 61811-50:2002, Electromechanical all-or-nothing relays – Part 50: Sectional specification –
Electromechanical all-or-nothing telecom relays of assessed quality
QC 001002-2:1998, Rules of Procedure for the IEC Quality Assessment System for Electronic
Components (IECQ) – Part 2: Documentation
QC 001002-3:1998, Rules of Procedure for the IEC Quality Assessment System for Electronic
Components (IECQ) – Part 3: Approval Procedures
QC 001005:2000, Register of Firms, Products and Services approved under the IECQ System,
including ISO 9000
(National authorized institutions will complete this clause by making reference to any documents
or specifications directly referred to in their national equivalent of this standard.)

1.3 Front page of the detail specification
The layout of the front page of the detail specification is as follows.
(1) QC xxxxxx (2)
Edition: 200X
Page 1 of x
(4)
Electronic components of assessed (3)
quality in accordance with:
IEC 61810-7:1997
IEC 61811-50:2002
Detail specification for electromechanical all-or-nothing telecom relays of assessed quality

Type: (5)
Construction: (6)
Outline drawing and wiring diagram (7) Application: (8)

Dimensions in millimetres
Coil data (9)
Rated voltages:              … V d.c.
Rated power:                … mW
Contact data (10)
Number(s) and type(s) of contacts
Rated contact voltage:
Rated contact current:
Rated contact power:
Component climatic category according to IEC 60068-1: (11)
Temperature range – operating ambient temperature: …°C to …°C
– storage temperature: …°C to …°C
Information about manufacturers who have components qualified according to this detail
specification is available in the current QC 001005.

– 8 – IEC 61811-51:2002 © IEC 2002
Key to front page:
The numbers between brackets on the front page correspond to the following indications which
should be given.
Identification of the detail specification
(1) The name of the national standards organization under whose authority the detail specifi-
cation is published and, if applicable, the organization from whom the detail specification
is available.
(2) The IECQ symbol and the number allotted to the completed detail specification by the
IECQ secretariat.
(3) The number and the year of availability of the IEC standard concerning test and
measurement procedures for electromechanical all-or-nothing relays and/or sectional
specification; also national reference, if different.
(4) If different from the IECQ number, the national number of the detail specification, date of
issue and any further information required by the national system, together with any
amendment numbers.
Identification of the relay
(5) Type: monostable or bistable, non-polarized or polarized, number and types of contacts.
(6) Construction: sizes, for example dual-in-line, base and overall height, type of relay, based
upon environmental protection (RT I to RT IV), mounting variants and other typical
construction details.
(7) An outline drawing with main dimensions which are of importance for interchangeability,
and/or reference to the appropriate national or international document for outlines.
Alternatively, this drawing may be given in an annex to the detail specification, but (7)
should always contain an illustration of the general outer appearance of the component.
(8) Typical field of applications.
(9) Available rated coil voltages and rated power.
(10) Available contact arrangements, defined special contact materials and contact voltage,
current and power. The respective code digit for contact materials shall be listed in an
annex, if applicable.
(11) Component climatic category according to clause 8 and annex A of IEC 60068-1, and
temperature range.
2 Characteristic values of the relay
2.1 General data
– Thermal resistance: max. … K/W
– Contact application: CA 0, CA 1, CA 2 and CA 3
– Relay mass: max. … g
– Finish of the terminals: presoldering; admissible non-presoldered part, for example max.
distance to the relay body, if applicable
– Insulation resistance: … MΩ min. at 500 V d.c. initial value
– Dielectric strength: see table 1

Table 1 – Dielectric test voltages
Dielectric test Impulse voltage test
V a.c. min.
10/700 µs and/or 1,2/50µs
V min.
Opened contact circuits
Between separate contact circuits
Coil to contact circuits
All parts to case
2.2 Construction of IECQ type designation (ordering information)
Relay IECQ xxxxxx
X Y 9 Z
Denomination
IECQ detail specification number
Rated coil voltage (first letter of identification code of table 2)
Rated power (second letter of identification code of table 2)
Defined, special contact material (according to annex)
Special attributes and/or surface mounting type (according to annex)

The coding of the monostable or bistable relay type shall be combined with the rated power of
the coil, if applicable. The reference to the number and types of contacts shall be given on the
front page of the specification.
Use code 0 as the last digit if no special attributes apply. If one of the attributes in the example
for a detail specification shall not be considered, the corresponding code number or letter shall
be deleted; there shall be no special marks or open space for non-applicable attributes (see also
2.5).
The manufacturer may use his own numbering system, provided that a conversion list with the
IECQ type designations and the manufacturer's part numbers is given in an annex to the detail
specification.
2.3 Coil data
Table 2 – Coil data
Maximum
Coil
Must operate Must not Must release
coil
resistance
Identifi- Rated voltage release voltage voltage Rated
voltage
cation voltage at V V V power
V
code V (23 ± 2) °C at coil at coil at coil mW
at coil
temperature of temperature of temperature of
Ω ± 10 %
temperature of
°C 23 °C °C °C 23 °C °C 23 °C °C

– 10 – IEC 61811-51:2002 © IEC 2002
2.4 Contact data
2.4.1 Electrical endurance and switching frequency
Contact failure: contact-circuit resistance of a closed contact higher than the value stated

in 2.4.2, or resistance of an open contact-circuit lower than 100 kΩ, both more than once per 10
cycles or for the minimum number of switching cycles stated (if lower than 10 ), calculated for
each single contact.
Example: at a given endurance of 10 operations, the total number of faults, as described
above, shall not exceed 10.
Table 3 – Loads, contact-circuit resistance limits, switching cycles and frequencies
for electrical endurance and overload tests
Contact-circuit Number of Switching
Loads resistance switching frequencies
cycles min. cycles per s max.
Ω max.
Contact application 0
Resistive max. contact voltage/max. power
Resistive max. contact current/max. power
DC open-ended cable
Overload
2.4.2 Static contact-circuit resistance
100 mΩ max. initial condition at rated voltage;
10 mΩ max. difference of contact-circuit resistance at other coil voltages (e.g. at must
operate voltage for make contacts), initial value;
1 Ω max. during/after electrical endurance and environmental tests at rated voltage.
2.4.3 Mechanical endurance
Min. … switching cycles.
2.4.4 Timing (without suppression device)
– Operate time: max.  …ms
– Release time: max.  …ms
– Bounce time when the contacts are closing: max.  …ms
– Bounce time when the contacts are opening: max.  …ms
– Transfer time on operation and release (last break contact opens
before first make contact closes respectively last make contact opens
before first break contact closes – each contact monitored) or bridging
time on operation and release (last make contact closes before first
break contact opens respectively last break contact closes before first
make contact opens – each contact monitored): min.  …ms

2.5 Mounting
The relay terminals are designed to be directly soldered onto the printed circuit board using
conventional assembling techniques or for surface mounting technology (if applicable).
2.6 Environmental data
The relays shall withstand at least the following environmental stresses:
– shock, functional: …m/s (g) half-sine acceleration, …ms duration;
– shock, survival: …m/s (g) half-sine acceleration, …ms duration;
– vibration (sinusoidal): …amplitude mm or …m/s (g), to …Hz;
– mechanical robustness of terminals
• thrust: …N;
• bending: …bends;
– soldering:
• if particular ageing is required, this shall be selected from procedures 1a, 1b, 2 or 3 of
4.2 of IEC 60068-2-20 and stated in the detail specification;
• solderability at 235 °C: 2 s;
• resistance to soldering heat,
terminal immersion time at 260 °C: 5 s or 10 s;
– enclosure (if relevant): leak rate: max. 100 Pa · cm /s;
– resistance to cleaning solvents when rubbed with tissue paper: demineralized or distilled
water at 55 °C: 5 min;
– fire hazard, needle flame: min. …s;
– acoustic noise level (optional requirement
shall be stated in detail specification): max. …dB.
2.7 Package of relays for automatic handling (if applicable)
If stick magazines or tape and reel packaging for automatic handling (to facilitate automatic
relay insertion) are used, their outline drawing (profile and length), storage capacity and
possible marking shall be given in an annex.
3 Qualification approval procedures
– As stated in 3.1.4 a) of QC 001002-3, fixed sample.
– Sampling and test schedule are specified in table 5.
– The tests specified and their order are mandatory.
4 Quality conformance inspection
Quality conformance inspection contains the tests stated in table 4:
– groups A and B: lot-by-lot tests;
– group C: periodic tests.
– 12 – IEC 61811-51:2002 © IEC 2002
Unless otherwise stated in this blank detail specification, all tests of table 4 are mandatory.
Where a subgroup contains cumulative tests, the order of the tests is mandatory. Specimens
subjected to tests denoted as destructive (D) shall not be released for delivery.
NOTE If a special level of AQL is required, the AQL value regarding subgroups A4, B1 and B2 in table 4 should be
provided between the manufacturer and user of a relay.
4.1 Formation of inspection lots
According to 3.2.3 of QC 001002-3, the basis for determination of sample size for the quality
conformance inspection is the relay quantity produced during one week.
4.2 Intervals between tests
– Subgroups A4, B1 and B2: minimum once a week.
– Subgroups C1 and C2: at least once a year.
– Subgroups C4 to C6: at least once every two years.
5 Marking and documentation
Relays and their package shall be marked as follows.
5.1 Marking of the relay
The marking shall be durable and easily legible, the following items shall be present:
a) manufacturer's name, logo or trade mark;
b) relay type and variant code;
c) coded date of manufacture, in terms of year/week according to 1.5.3 of IEC 61811-50;
d) IECQ in letters or IECQ mark of conformity;
e) IECQ type designation (ordering information), if not implicit in b), see also 2.2;
f) identification of terminal No. 1.
NOTE IECQ type designation in item e) may be omitted in an unavoidable case.
5.2 Marking of the package
a) Manufacturer's name, logo or trade mark.
b) Relay type and variant code.
c) Manufacture’s batch identification code.
d) IECQ in letters or IECQ mark of conformity;
e) IECQ type designation(ordering information), if not implicit in b), see also 2.2;
f) Detail specification reference if not marked on the relay.
g) Quantity.
NOTE IECQ type designation in item e) may be omitted in an unavoidable case.
5.3 Documentation
For each delivery, a declaration of conformity according to 2.4 of QC 001002-2 shall be added.

6 Annexes
Annexes may be added if necessary, for example to show more details on relay mounting,
terminal dimensions, etc.
7 Tests
7.1 Standard conditions for testing
If not otherwise stated, all tests shall be performed under standard conditions for testing
according to 3.5 of IEC 61810-7.
7.2 Mounting of test specimens during the test
The following indications shall apply for mechanical dynamic tests (shock and vibration). The
relay shall be mounted by its normal mounting method to the test fixture where inherent
resonances have been minimized so as not to invalidate the test (see also IEC 60068-2-47).
7.3 General conditions for testing
Unless otherwise stated, the rated coil voltage specified in table 2 and its suitable polarity (if
applicable) shall be used for all tests and its application to the relay.
8 Ordering information
See 2.2.
9 Relay reliability – failure rate data (optional)
The evaluation and indication of reliability data is not mandatory.
However, if required in a detail specification, this optional clause shall refer to, and be in line
with, clause 5 of IEC 61811-50 and give a concise description of the methods and the set of
parameters applied. Details shall be given in an appropriate annex to the detail specification,
preferably based upon the provisions of IEC 61709 as indicated in annex A of IEC 61811-50.

– 14 – IEC 61811-51:2002 © IEC 2002
Table 4 – Quality conformance inspection
Group A
Subgroup A0
For all tests in this subgroup: 100 % test. Discard all failed relays. Tests in this subgroup shall
be carried out as a screening or sorting function, possibly
on-line, prior to the formation of lots from which samples for the
other subgroups are taken. The lot shall be rejected in case of a
failure rate of more than 10 % cumulative.
Test Test Test conditions according to Performance
No. IEC 61810-7 requirements
A0 – 1 Coil resistance (ND) Subclause 3.8.1 Values according to table 2
A0 – 2 Dielectric test (ND) Subclause 3.9 No breakdown or flashover
Maximum leakage current
Application points and test voltage: according to
1 mA
2.1, table 1 of this specification
Duration of test: 1 s
NOTE A shorter test with a higher voltage can be
stated in the detail specification if its equivalence is
proved by the manufacturer.
A0 – 3 Contact-circuit resistance, Subclause 3.12 Initial value according to 2.4.2
static (ND) for each contact closing
Application points: terminals of all closed
contacts
Test voltage max.: 30 mV d.c. or a.c.
Test current max.: 10 mA
A0 – 4 Functional tests (ND) Subclause 3.13 Values according to table 2
Checking the relay function by
Order of steps for monostable non-polarized relays:
monitoring the contacts
1) 1,5 × rated voltage for conditioning
2) zero voltage
3) must operate voltage
4) rated voltage
5) must not release voltage
6) must release voltage
Order of steps for other relay types:
analogous according to figures 2 to 5
One cycle
Contact voltage: max. 6 V
Mounting: optional
A0 – 5 Timing tests (ND)
Subclause 3.14 Values according to 2.4.4
Coil voltage: rated voltage Checking of contact
Application points: all contacts sequencing by measuring the
Contact voltage: max. 6 V transfer/bridging time (see 4.4,
Mounting: optional note 4 of IEC 61811-50)
A0 – 6 Sealing (ND) Subclause 3.20.2 Value according to 2.6
Procedure 1, 2 or 4 for RT III and RT IV
R
A0 – 33 Acoustic noise (ND) Subclause 3.44, method 1 Value according to 2.6
Suppression diode, microphone distance,
R
measuring dynamic characteristics and other
conditions, if required, shall be stated in the detail
specification
R  recommended test.
Table 4 (continued )
Subgroup A4 (period: inspection lot refers to the production volume of one week)
Test Test Test conditions according to IL AQL Performance
No. IEC 61810-7 requirements
1 Visual inspection – relay Subclause 3.6.4, items a) and b)  Marking as specified in 5.1
marking (ND)
2 Coil resistance (ND) Subclause 3.8.1  Values according to
table 2
3 Contact-circuit Subclause 3.12  Initial value and the
resistance, static (ND) Application points: terminals of difference according to
all closed 2.4.2 for each contact
contacts closing
Test voltage max.: 30 mV d.c.
or a.c.
Test current max.: 10 mA
4 Functional tests (ND) Subclause 3.13 S4 1,0
Values according to
table 2
Checking the relay function
Order of steps for monostable
by monitoring the contacts
non-polarized relays:
1) 1,5 × rated voltage for conditioning
2) zero voltage
3) must operate voltage
4) rated voltage
5) must not release voltage
6) must release voltage
Order of steps for other relay types:
analogous according to figures 2 to 5
One cycle
Contact voltage: max. 6 V
Mounting: optional
5 Timing tests (ND) Subclause 3.14  Values according to 2.4.4

Checking of contact
Coil voltage: rated voltage
sequencing by measuring
Application points: all contacts
the transfer/bridging time
Contact voltage: max. 6 V
(see 4.4, note 4 of
Mounting: optional
IEC 61811-50)
6 Sealing (ND) Subclause 3.20.2  Value according to 2.6
Procedure 1, 2 or 4 for RT III and RT IV
33 Acoustic noise (ND) Subclause 3.44, method 1  Value according to 2.6
R
Suppression diode, microphone
distance, measuring dynamic
characteristics and other conditions, if
required, shall be stated in the detail
specification
R recommended test.
Group B
Subgroup B1 (period: inspection lot refers to the production volume of one week)
Test IL AQL
Test Test conditions according to Performance
No. IEC 61810-7 requirements
7 Visual inspection – other Subclauses 3.6.1 and 3.6.4, items c) S3 2,5 Dimensions according to
than marking, check of and d) outline drawing on front
outside key dimensions page
– correct housing
(ND)
– terminals
– dimensions
– 16 – IEC 61811-51:2002 © IEC 2002
Table 4 (continued)
Subgroup B2 (period: inspection lot refers to the production volume of one week)
Test Test Test conditions according to IL AQL Performance
No. IEC 61810-7 requirements
8 Solderability (D) Subclause 3.25, test 1 S3 2,5

Ageing, if applicable – see 2.6 of this

specification
Test method 1 (test Ta, method 1)

Number of terminals to be tested: all
M*
M* mandatory if not tested in C1.

Group C
Subgroup C1 (period: one year)
Test Test Test conditions according to Sample Acceptable Performance
No. IEC 61810-7 size number of requirements
defectives
34 Magnetic Subclause 3.37, method 1, 2 or 3 20 0 Failure criteria
interference (ND) according to the detail
specification
R If required, test conditions shall be stated
in detail specification
8 a Solderability (D) Subclause 3.25, test 1 10 0

Ageing, if applicable – see 2.6 of this
specification
Test method 1 (test Ta, method 1)
M** Number of terminals to be tested: all
9 Electrical Subclause 3.30.3, method 1 20 0 Number of cycles
endurance, according to table 3
cable load (D) Contact load: open-end cable, 10 m Contact failure
telephony cable n × 4 × 0,6 mm, one wire according to 2.4.1
connected to the contact
tested and the other three wires to
ground, 48 V d.c. according to 4.5 of IEC
60255-14
Number of contacts loaded/tested:
two contact circuits or one change-over
contact respectively
Coil voltage: rated voltage
Number of cycles per s:
Duty factor: 1:1
Ambient temperature: °C
Test contact voltage: max. 6 V
Test contact current: max. 10 mA
R recommended test.
M** mandatory for relays manufactured with automatic facilities only, if not tested in subgroup B2 and if stated in
the detail specification.
Table 4 (continued)
Subgroup C1 (concluded)
Test Test Test conditions according to Sample Acceptable Performance
No. IEC 61810-7 size number of requirements
defectives
9 Electrical Final measurements:
endurance,
cable load (D) Test 3 – contact-circuit resistance Value according to 2.4.2
(continued) Test 4 – functional tests Values according to table 2
Checking the relay function
by monitoring the contacts
Test 5 – timing tests Values according to 2.4.4
Test 13 – insulation resistance Value according to 2.1
10 Electrical Subclause 3.30.4 20 0 Number of cycles according
endurance, to table 3
contact Number of contacts loaded/tested: Contact failure according to
application 0 two contact circuits or one change-over 2.4.1
(D) contact respectively
Coil voltage: rated voltage
Number of cycles per s:
Duty factor: 1:1
Ambient temperature: °C
Test contact voltage: max. 30 mV
Test contact current: max. 10 mA

Final measurements:
Test 3 – contact-circuit resistance Value according to 2.4.2
Test 4 – functional tests Values according to table 2
Checking the relay function
by monitoring the contacts
Test 5 – timing tests Values according to 2.4.4
Test 13 – insulation resistance Value according to 2.1

– 18 – IEC 61811-51:2002 © IEC 2002
Table 4 (continued)
Subgroup C2 (period: one year)
Test Test Test conditions according to Sample Acceptable Performance
No. IEC 61810-7 size number of requirements
defectives
33 Acoustic Subclause 3.44, method 1 10 0 Value according to 2.6
noise (ND)
Suppression diode, microphone
distance, measuring dynamic
characteristics and other conditions, if
R*
required, shall be stated in the detail
specification
11 Dielectric test Subclause 3.9 20 0 No breakdown or
(ND) flashover
Application points and test voltage: Maximum leakage current:
according to 2.1, table 1 of this 1 mA
specification
Duration of test: 60 s
12 Impulse Subclause 3.10 5 0
voltage test
(ND) Application points and test voltage:
according to 2.1, table 1 of this
specification
Consecutive pulses with the polarity
reversed
Frequency: 2 or 4 pulses/min
Total number of pulses: 6
Final measurements:
Test 3 – contact-circuit resistance Value according to 2.4.2
Test 4 – functional tests Values according to
table 2
Checking the relay
function by monitoring the
contacts
Test 13 – insulation resistance Value according to 2.1
13 Insulation Subclause 3.11 20 0 Value according to 2.1
resistance
(ND)
Application points: all terminals as
specified in 3.11.2
Test voltage: according to 2.1 of this
specification
Duration of test: 60 s or when the steady
value has been reached
14 Sealing (ND) Subclause 3.20.2  Failure criteria according
to 3.5.5 of
Procedure 1 (test Qc, method 2) for RT III IEC 60068-2-17
and RT IV
Test liquid temperature: °C
Immersion time: 1 min
R recommended test.
* Only if not tested in A0 or A4 respectively.

Table 4 (continued)
Subgroup C4 (period: two years)
Test Test Test conditions according to Sample Acceptable Performance
No. IEC 61810-7 size number of requirements
defectives
15 Electrical Subclauses 3.30.6 or 3.30.3, method 1 20 0 Number of cycles according
endurance, to table 3
cable load, Contact load: open-end cable, 10 m Contact failure according
extended telephony cable n × 4 × 0,6 mm, one wire to 2.4.1
assessment (D) connected to the contact tested and the
other three wires to ground, 48 V d.c.
according to 4.5 of IEC 60255-14
Number of contacts loaded/tested:
two contact circuits or one change-over
contact respectively
Coil voltage: rated voltage
Number of cycles per s:
Duty factor: 1:1
Ambient temperature: °C
Test contact voltage: max. 6 V
Test contact current: max. 10 mA

Final measurements:
Test 3 – contact-circuit resistance Value according to 2.4.2
Test 4 – functional tests Values according to table 2
Checking the relay function
by monitoring the contacts
Test 5 – timing tests Values according to 2.4.4
Test 13 – insulation resistance Value according to 2.1
16 Electrical Subclause 3.30.3, method 1 20 0 Number of cycles according
endurance, to table 3
rated contact Contact load according to 4.1 of Contact failure according to
voltage resistive IEC 60255-14: V d.c./W 2.4.1
load (D) Number of contacts loaded/tested:
two contact circuits or one change-over
contact respectively
Coil voltage: rated voltage
Number of cycles per s:
Duty factor: 1:1
Ambient temperature: °C
Test contact voltage: max. 6 V
Test contact current: max. 10 mA

Final measurements:
Test 3 – contact-circuit resistance Value according to 2.4.2
Test 4 – functional tests Values according to table 2
Checking the relay function
by monitoring the contacts
Test 5 – timing tests Values according to 2.4.4
Test 13 – insulation resistance Value according to 2.1

– 20 – IEC 61811-51:2002 © IEC 2002
Table 4 (continued)
Subgroup C4 (concluded)
Test Test Test conditions according to Sample Acceptable Performance
No. IEC 61810-7 size number of requirements
defectives
17 Electrical Subclause 3.30.3, method 1 5 0 Number of cycles according
endurance, to table 3
rated contact Contact load according to 4.1 of Contact failure according
current, resistive IEC 60255-14: A d.c./ W to 2.4.1
load (D) Number of contacts loaded/tested:
two contact circuits or one change-over
contact respectively
Coil voltage: rated voltage
Number of cycles per s:
Duty factor: 1:1
Ambient temperature: °C
Test contact voltage: max. 6 V
Test contact current: max. 10 mA
Final measurements:
Test 3 – contact-circuit resistance Value according to 2.4.2
Test 4 – functional tests Values according to table 2
Checking the relay function
by monitoring the contacts
Test 5 – timing tests Values according to 2.4.4
Test 13 – insulation resistance Value according to 2.1
18 Electrical Subclauses 3.30.6 or 3.30.4 20 0 Number of cycles according
endurance, to table 3
contact Number of contacts loaded/tested: Contact failure according
application 0, two contact circuits or one change-over to 2.4.1
extended contact respectively
assessment (D) Coil voltage: rated voltage
Number of cycles per s:
Duty factor: 1:1
Ambient temperature: °C
Test contact voltage: max. 30 mV
Test contact current: max. 10 mA

Final measurements:
Test 3 – contact-circuit resistance Value according to 2.4.2
Test 4 – functional tests Values according to table 2
Checking the relay function
by monitoring the contacts
Test 5 – timing tests Values according to 2.4.4
Test 13 – insulation resistance Value according to 2.1

Table 4 (continued)
Subgroup C5 (period: two years)
Test Test Test conditions according to Sample Acceptable Performance
No. IEC 61810-7 size number of requirements
defectives
19 Thermal Subclause 3.32 5 0
endurance (D) Duration: 21 days
Ambient temperature:   °C
Coil voltage: rated
voltage
Contact current: A
Final measurements:
Test 3 – contact-circuit resistance Value according to 2.4.2
Test 4 – funct
...