IEC 61811-51:2002

INTERNATIONAL IEC
STANDARD
61811-51
QC 160501
Second edition
2002-03
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
soumis au régime d'assurance de la qualité –
Types et construction non normalisés
Reference number
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INTERNATIONAL IEC
STANDARD
61811-51
QC 160501
Second edition
2002-03
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
soumis au régime d'assurance de la qualité –
Types et construction non normalisés
 IEC 2002  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
T
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61811-51  IEC:2002(E)
CONTENTS
FOREWORD.3
1 General .5
1.1 Scope.5
1.2 Normative references .5
1.3 Front page of the detail specification.6
2 Characteristic values of the relay .7
2.1 General data.7
2.2 Construction of IECQ type designation (ordering information).8
2.3 Coil data.8
2.4 Contact data.9
2.4.1 Electrical endurance and switching frequency.9
2.4.2 Static contact-circuit resistance.9
2.4.3 Mechanical endurance .9
2.4.4 Timing (without suppression device).9
2.5 Mounting .9
2.6 Environmental data.10
2.7 Package of relays for automatic handling (if applicable) .10
3 Qualification approval procedures .10
4 Quality conformance inspection .10
4.1 Formation of inspection lots .11
4.2 Intervals between tests .11
5 Marking and documentation .11
5.1 Marking of the relay .11
5.2 Marking of the package.11
5.3 Documentation .11
6 Annexes .11
7 Tests .12
7.1 Standard conditions for testing.12
7.2 Mounting of test specimens during the test .12
7.3 General conditions for testing .12
8 Ordering information .12
9 Relay reliability – failure rate data (optional) .12

61811-51 © IEC:2002(E) – 3 –
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 second edition of IEC 61811-51 cancels and replaces the first edition published in 1997
and constitutes a technical revision.
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 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.

– 4 – 61811-51  IEC:2002(E)
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.
61811-51 © IEC:2002(E) – 5 –
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
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

– 6 – 61811-51  IEC:2002(E)
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
Electronic components of assessed (3) (4)
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
...