IEC 61811-10:2002

INTERNATIONAL IEC
STANDARD
61811-10
QC 160100
First edition
2002-11
Electromechanical elementary relays
of assessed quality –
Part 10:
Sectional specification –
Relays for industrial application
Relais élémentaires électromécaniques
soumis au régime d'assurance de la qualité –
Partie 10:
Spécification intermédiaire –
Relais pour applications industrielles
Reference number
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INTERNATIONAL IEC
STANDARD
61811-10
QC 160100
First edition
2002-11
Electromechanical elementary relays
of assessed quality –
Part 10:
Sectional specification –
Relays for industrial application
Relais élémentaires électromécaniques
soumis au régime d'assurance de la qualité –
Partie 10:
Spécification intermédiaire –
Relais pour applications industrielles
 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
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Commission Electrotechnique Internationale
S
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61811-10  IEC:2002(E)
CONTENTS
FOREWORD . 3
1 General . 5
1.1 Scope . 5
1.2 Normative references . 5
1.3 Marking . 6
1.4 Ordering information. 6
2 Quality assessment procedures . 6
2.1 Primary stage of manufacture . 6
2.2 Structurally similar relays. 6
2.3 Subcontracting . 7
2.4 Qualification approval procedures. 7
2.5 Quality conformance inspection requirements. 7
2.6 Test schedule . 7
2.7 Order of tests . 8
3 Preparation of blank detail and detail specifications. 8
3.1 Contents of blank detail and detail specifications. 8
3.2 Basic test schedule. 9
3.3 Test schedule for blank detail specifications .10
4 Relay reliability – Failure rate data.13
Annex A (informative) Explanations and examples regarding IL and AQL values.15
Annex B (informative) Data base for failure rates .17
Figure B.1 – Factor π depending on the operating cycles .20
S
Table 1 – Tests for quality conformance inspection . 10-13
Table B.1 – Factor π .20
ES
Table B.2 – Factor π .21
T
61811-10  IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMECHANICAL ELEMENTARY RELAYS
OF ASSESSED QUALITY –
Part 10: Sectional specification –
Relays for industrial application
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 61811-10 has been prepared by IEC technical committee 94: All-
or-nothing electrical relays.
This standard cancels and replaces IEC 60255-19 (1983) and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
94/168/FDIS 94/172/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 2.

– 4 – 61811-10  IEC:2002(E)
The committee has decided that the contents of this publication will remain unchanged until
2006. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
61811-10  IEC:2002(E) – 5 –
ELECTROMECHANICAL ELEMENTARY RELAYS
OF ASSESSED QUALITY –
Part 10: Sectional specification –
Relays for industrial application
1 General
1.1 Scope
This part of IEC 61811 is a sectional specification applicable to electromechanical elementary
(non-specified time all-or-nothing) relays of assessed quality for industrial application.
NOTE Electromechanical all-or-nothing telecom relays of assessed quality are covered by IEC 61811-50.
It is based on the basic relay standard IEC 61810-1 as well as on the generic specification
IEC 61811-1 and selects from IEC 61810-7 the appropriate test and measurement procedures
to be used in detail specifications derived from this specification. Moreover it contains a basic
test schedule to be used in the preparation of such specifications. Detailed test schedules are
given in the blank detail specifications supplementary to this sectional specification.
For the purpose of this standard, only fundamental tests have been compiled. Depending on
the field of application, further tests should be selected as appropriate, preferably in
accordance with the test and measurement procedures of IEC 61810-7.
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 60062:1992, Marking codes for resistors and capacitors
IEC 60255-23:1994, Electrical relays – Part 23: Contact performance
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 61709:1996, Electronic components – Reliability – Reference conditions for failure rates
and stress models for conversion
IEC 61810-1:1998, Electromechanical non-specified time all-or-nothing relays – Part 1:
General requirements
IEC 61810-5:1998, Electromechanical non-specified time all-or-nothing relays – Part 5:
Insulation coordination
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 QC 001002-3, IEC Quality Assessment System for Electronic Components (IECQ) –
Rules of Procedure – Part 3: Approval procedures

– 6 – 61811-10  IEC:2002(E)
1.3 Marking
Relays and their package supplied in accordance with detail specifications covered by this
sectional specification, shall as a minimum be marked as follows:
1.3.1 Relay
• Trade mark or manufacturer’s name
• Relay type and variant code
• Date of manufacture, year/week, coded in accordance with IEC 60062
• IECQ mark
Where space permits, a circuit diagram or terminal identification should be given.
1.3.2 Package
• Trade mark or manufacturer’s name
• Detail specification reference if not marked on the relay
• Quantity
• Relay type and variant code
• Manufacturer’s batch identification code
1.4 Ordering information
The ordering information shall be coded and shall contain the following details:
• IECQ detail specification number
• Coded coil voltage
• Terminal code
• Coded mounting arrangement
• Specials code
2 Quality assessment procedures
2.1 Primary stage of manufacture
The primary stage of manufacture is the first process subsequent to the manufacture of
finished parts and subassemblies of the relay.
NOTE 1 A subassembly is understood to mean here the permanent assembly of two or more piece parts.
NOTE 2 Important manufacturing steps are as follows:
a) fabrication, heat treatment and plating of the component parts of the relay;
b) coil winding;
c) assembling of the electrical and electromechanical parts;
d) adjustment of the relay contacts, if applicable;
e) high-temperature drying, gas backfilling and sealing of the relay, if applicable;
f) final measurements and periodic inspection of test groups A to D.
2.2 Structurally similar relays
Relays are considered structurally similar if having no differences in design other than in:
a) coil wire diameter, number of windings and the coil transient suppression device;
b) types, numbers and material of contacts;
c) rated coil and/or contact voltage(s);
d) mounting and terminal variants within the limits prescribed in the detail specification.

61811-10  IEC:2002(E) – 7 –
2.3 Subcontracting
Subcontracting the primary stage of manufacture (see 2.1) and/or subsequent stages to an
unapproved manufacturer is forbidden. Subcontracting is permitted for any stages preceding
the primary stage of manufacture and shall be in accordance with the requirements of
(normative) Annex B to Clause 2 of IEC QC 001002-3.
2.4 Qualification approval procedures
The manufacturer shall comply with the general requirements of the basic rules governing
qualification approval defined in Clause 3 of IEC QC 001002-3 and the provisions given in 2.2
of IEC 61
...