Electromechanical elementary relays - Part 3: Relays with forcibly guided (mechanically linked) contacts

IEC 61810-3:2015 specifies special requirements and tests for elementary relays with forcibly guided contacts, also known as mechanically linked contacts. These special requirements apply in addition to the general requirements of IEC 61810-1.

Relais électromécaniques élémentaires - Partie 3: Relais à contacts guidés (liés mécaniquement)

L'IEC 61810-3:2015 spécifie les exigences et essais particuliers pour les relais élémentaires à contacts guidés, également connus sous le nom de contacts liés mécaniquement. Ces exigences particulières s'appliquent en plus des exigences générales de l'IEC 61810-1.

General Information

Status
Published
Publication Date
24-Feb-2015
Current Stage
PPUB - Publication issued
Start Date
25-Feb-2015
Completion Date
25-Feb-2015
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IEC 61810-3
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electromechanical elementary relays –
Part 3: Relays with forcibly guided (mechanically linked) contacts
Relais électromécaniques élémentaires –
Partie 3: Relais à contacts guidés (liés mécaniquement)
IEC 61810-3:2015-02(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61810-3
Edition 1.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electromechanical elementary relays –
Part 3: Relays with forcibly guided (mechanically linked) contacts
Relais électromécaniques élémentaires –
Partie 3: Relais à contacts guidés (liés mécaniquement)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70 ISBN 978-2-8322-2236-2

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61810-3:2015 © IEC 2015
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ....................................................................................................... 6

3 Terms and definitions....................................................................................................... 6

4 Functional requirements ................................................................................................... 7

4.1 Forcibly guided (mechanically linked) operation ....................................................... 7

4.2 Changeover contacts ............................................................................................... 7

4.3 Mechanical endurance............................................................................................. 8

4.4 Electrical endurance ................................................................................................ 8

4.5 Operating conditions ............................................................................................... 8

4.5.1 Ambient temperature ........................................................................................ 8

4.5.2 Energizing quantity ........................................................................................... 8

4.6 Characteristic values and marking ........................................................................... 8

4.6.1 Characteristic values ........................................................................................ 8

4.6.2 Marking ........................................................................................................... 8

5 Verification and type tests ................................................................................................ 9

5.1 Design verification ................................................................................................... 9

5.2 Type tests ............................................................................................................... 9

5.3 Test procedure ...................................................................................................... 10

5.3.1 Testing for failure to open .............................................................................. 10

5.3.2 Mechanical and electrical endurance .............................................................. 10

Bibliography .......................................................................................................................... 11

Figure 1 – Symbol for a forcibly guided (mechanically linked) contact set, type A ..................... 8

Figure 2 – Symbols for use on type B relays ............................................................................ 9

---------------------- Page: 4 ----------------------
IEC 61810-3:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMECHANICAL ELEMENTARY RELAYS –
Part 3: Relays with forcibly guided (mechanically linked) contacts
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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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.

International Standard IEC 61810-3 has been prepared by IEC technical committee 94: All-or-

nothing electrical relays.

The content of this standard was already published in EN 50205:2002. The revisions in this

standard only involve editorial changes and update of references.
The text of this standard is based on the following documents:
FDIS Report on voting
94/378/FDIS 94/382/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.
---------------------- Page: 5 ----------------------
– 4 – IEC 61810-3:2015 © IEC 2015

This publication 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.

The committee has decided that the contents of this publication will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 61810-3:2015 © IEC 2015 – 5 –
INTRODUCTION

This Standard applies to elementary relays in which special design and constructional

measures are used to ensure that make (normally-open) contacts cannot assume the same

state as break (normally-closed) contacts. These relays can be used in self-monitoring control

systems, e.g. safety-related control systems.
---------------------- Page: 7 ----------------------
– 6 – IEC 61810-3:2015 © IEC 2015
ELECTROMECHANICAL ELEMENTARY RELAYS –
Part 3: Relays with forcibly guided (mechanically linked) contacts
1 Scope

This part of IEC 61810 specifies special requirements and tests for elementary relays with

forcibly guided contacts, also known as mechanically linked contacts. These special

requirements apply in addition to the general requirements of IEC 61810-1.

NOTE 1 This standard does not apply to electromechanical control circuit devices as described in IEC 60947-5-1.

NOTE 2 IEC 61810-2-1 provides guidelines for the assignment of reliability values.

NOTE 3 Contacts that are not mechanically linked (forcibly guided) are not considered in this standard.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

IEC 60947-5-1, Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and

switching elements – Electromechanical control circuit devices

IEC 61810-1:2015, Electromechanical elementary relays – Part 1: General and safety

requirements
IEC 61810-7, Electromechanical elementary relays – Part 7: Test and measurement
procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
elementary relay
non-specified time all-or-nothing relay

Note 1 to entry: In this document the word “elementary” is sometimes omitted for clarity.

[SOURCE: IEC 60050-444:2002, 444-01-03, modified – modification of the definition]

3.2
failure to open
fault condition when a contact does not open when expected to do so
3.3
failure criteria
specified conditions to judge if a fault or malfunction is a failure
---------------------- Page: 8 ----------------------
IEC 61810-3:2015 © IEC 2015 – 7 –
3.4
fault
fault condition
deviation of the existing condition from the expected condition
3.5
failure

termination of the ability of an item to perform a required function as defined in the failure

criteria
3.6
relay with mechanically linked contacts
relay with forcibly guided contacts

elementary relay with at least one make contact and at least one break contact and including

mechanical measures to prevent any make contact(s) and any break contact(s) being in the

closed position simultaneously
3.7
type A
relay in which all contacts are mechanically linked
3.8
type B

relay containing contacts that are mechanically linked to each other as well as contacts that are

not mechanically linked
4 Functional requirements
4.1 Forcibly guided (mechanically linked) operation

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 conditions.

The effects of reasonably foreseeable breakage of and/or wear to parts of the elementary relay

shall not nullify the function of forcibly guided (mechanically linked) operation.

Contact gaps of open contacts shall be greater than 0,5 mm for single break contacts and

0,3 mm each for double break contacts throughout the manufacturer’s specified endurance of

the relay.

Operation of forcibly guided (mechanically linked) contacts means that if any make contact fails

to open when the relay is de-energized, none of the break contacts shall close. If any break

contact fails to open when the relay is energized, no make contact shall close.
4.2 Changeover contacts

Only break contacts and make contacts are covered by this standard; in the case of relays that

include changeover contacts, either the make circuit or the break circuit of a changeover

contact can be considered to meet the requirements of this standard.

Changeover contacts shall be break-before-make. It shall be assured that the forcibly guided

operation is maintained, as described under the fault conditions described in 5.1.

NOTE Special care is taken in the design of the application to ensure that the integrity of the safety-related circuit

is maintained in the event of a failure.
---------------------- Page: 9 ----------------------
– 8 – IEC 61810-3:2015 © IEC 2015
4.3 Mechanical endurance

Elementary relays containing forcibly guided (mechanically linked) contacts shall have a

mechanical endurance of at least 10 operating cycles.
4.4 Electrical endurance

The electrical endurance shall be as specified by the manufacturer in accordance with

IEC 61810-1.
4.5 Operating conditions
4.5.1 Ambient temperature

Elementary relays with forcibly guided (mechanically linked) contacts shall function correctly

over an ambient temperature range of at least –10 °C to +55 °C.
4.5.2 Energizing quantity

Unless otherwise stated by the manufacturer, elementary relays with forcibly guided

(mechanically linked) contacts shall at least correspond to class ‘2’ in the operative range of

their rated coil voltage (see 5.3.1 of IEC 61810-1:2015).
4.6 Characteristic values and marking
4.6.1 Characteristic values
The manufacturer shall state in his documentation the following:

a) whether the relay is type A or type B. In the case of type B relays, which contacts are

mechanically linked and which contacts are not mechanically linked;

b) the vibration resistance over the frequency range at least from f = 10 Hz to 200 Hz (see

IEC 61810-7);
c) the shock resistance of the relay in accordance with IEC 61810-7;

d) the contact load(s) according to IEC 61810-1:2015, Annex B or the utilization category(ies)

in accordance with IEC 60947-5-1;
NOTE Commonly utilisation categories AC15 and DC13 are applied.
e) the limits of the operative range.
4.6.2 Marking

Relays with forcibly guided (mechanically linked) contacts shall be marked to indicate whether

they are type A or type B. If a contact schematic is marked on the relay then the following

marking shall be placed adjacent to the schematic.

Type A relays with forcibly guided (mechanically linked) contacts shall be marked either with

the words “type A” or with the symbol given in the Figure 1 below:

Figure 1 – Symbol for a forcibly guided (mechanically linked) contact set, type A

---------------------- Page: 10 ----------------------
IEC 61810-3:2015 © IEC 2015 – 9 –

Type B relays with forcibly guided (mechanically linked) contacts shall be marked either with

the words “type B” or with the symbols given in the Figure 2 (Source ISO 7000:2014/Figure

0434) below:
Figure 2 – Symbols for use on type B relays
5 Verification and type tests
5.1 Design verification

A failure mode and effect analysis shall be performed considering all parts that are involved in

the forcibly guided (mechanically linked) operation. The analysis shall consider the breakage

and wear of these parts as well as failure to open.

All reasonably foreseeable single faults shall be assumed and their effects considered. If the

fault of a part leads directly to a second fault then the two faults shall be considered. If the fault

of a part is excluded as a failure criteria, the manufacturer shall justify the exclusion, for

example by design calculations or measurements showing over-dimensioning. The failure

criteria “spring broken” shall not be excluded.

It shall be considered whether, in case any electrically conductive parts break or come loose,

the construction of the elementary relay prevents any short-circuits or conductive connections

from occurring which would nullify the function of forcibly guided (mechanically linked)

operation.

NOTE 1 Bridging by conductive parts can be prevented by such means as, for example, insulation or other

appropriate methods applied between the conducting parts.

NOTE 2 Examples of conductive parts are contacts, contact springs and return springs.

The failure of movable functional parts as a result of, for example, breakage or wear shall be

considered and the result expected shall be evaluated.

NOTE 3 An example of a movable functional part is the actuator of the contact set.

5.2 Type tests

Type tests shall be performed to verify the function of forcibly guided (mechanically linked)

operation.

The tests shall be performed on new relays and also on relays that have been subjected to the

electrical and mechanical endurance tests.

The test shall be conducted by simulating the welding of a contact of the elementary relay. The

simulated welding shall be performed under worst case conditions using a separate sample for

each make contact and each break contact. A separate sample shall be used for each

simulated contact welding unless it can be demonstrated by analysis that a reduced number of

samples will give an equivalent test result.

Welding of the contacts shall be simulated by such means as, for example, soldering the

contacts together or using an appropriate glue. The thickness of the contact tips shall not

change by more than 0,02 mm as a result of having been soldered or glued. Break contacts

---------------------- Page: 11 ----------------------
– 10 – IEC 61810-3:2015 © IEC 2015

shall be soldered or glued with the relay in the release condition. Make contacts shall be

soldered or glued with the relay energised at the lower limit of the operative range.

The defect shall be built into break contacts with the elementary relay in the release condition.

The defect shall be built into make contacts at the lower limit of the operative range of the coil

voltage.
5.3 Test procedure
5.3.1 Testing for failure to open
5.3.1.1 Verification of the contact gap
The tests shall be performed at an ambient temperature of (23 ± 5) °C.

Either of the following methods may be used to verify the contact gap. The manufacturer shall

state in his documentation which method is used:

a) an optical check to determine if the contact gap is ≥ 0,5 mm in the case of single break

contacts, ≥ 0,3 mm in the case of double break contacts;
+0,02

b) it shall be possible to pass a measurement wire with a diameter of 0,5 mm in the case

−0,0
+0,02

of single break contacts, 0,3 mm in the case of double break contacts between the

−0,0
contact tips without the wire closing the circuit that includes the contact(s).

It shall be verified by analysis and/or additional tests as necessary that these requirements are

met throughout the manufacturer’s specified operating temperature range.
5.3.1.2 Testing
5.3.1.2.1 Failure to open of a make contact

After a defect has been built into a make contact and the relay de-energized, it shall be verified

that the contact gap of any break contact is ≥ 0,5 mm / ≥ 0,3 mm.

The relay shall then be energized with the maximum coil voltage for ≥ 5 min then de-energized

and the contact gap verified immediately.
5.3.1.2.2 Failure to open of a break contact

After a defect has been built into a break contact and the relay energized with the maximum

coil voltage the contact gap of any make contact shall be ≥ 0,5 mm / ≥ 0,3 mm.
The contact gap shall be verified
a) immediately after the application of the coil voltage,
b) after the relay has been energized for ≥ 5 min.

The tests shall be performed at an ambient temperature of (23 ± 5) °C. For the test,

consideration shall be given to the effect of the permissible range of operating temperature by

recalculating the values of the energizing quantity.

The contact gap of the make contact shall be determined after energizing the elementary relay

with the maximum value of the energizing quantity.
5.3.2 Mechanical and electrical endurance

The effects of wear shall be determined by means of appropriate endurance tests as specified

in 4.3 and 4.4.
---------------------- Page: 12 ----------------------
IEC 61810-3:2015 © IEC 2015 – 11 –
Bibliography

IEC 60050-444:2002, International Electrotechnical Vocabulary – Part 444: Elementary relays

IEC 61810-2-1, Electromechanical elementary relays – Part 2-1: Reliability – Procedure for the

verification of B values
ISO 7000:2014, Graphical symbols for use on equipment – Registered symbols
_____________
---------------------- Page: 13 ----------------------
– 12 – IEC 61810-3:2015 © IEC 2015
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 13

INTRODUCTION ................................................................................................................... 15

1 Domaine d'application .................................................................................................... 16

2 Références normatives .................................................................................................. 16

3 Termes et définitions ..................................................................................................... 16

4 Exigences fonctionnelles ................................................................................................ 17

4.1 Fonctionnement du guidage (lié mécaniquement) .................................................. 17

4.2 Contacts de commutation ...................................................................................... 17

4.3 Endurance mécanique ........................................................................................... 18

4.4 Endurance électrique ............................................................................................ 18

4.5 Conditions de fonctionnement ............................................................................... 18

4.5.1 Température ambiante ................................................................................... 18

4.5.2 Grandeur d'alimentation ................................................................................. 18

4.6 Valeurs caractéristiques et marquage .................................................................... 18

4.6.1 Valeurs caractéristiques ................................................................................. 18

4.6.2 Marquage ...................................................................................................... 18

5 Vérification et essais de type .......................................................................................... 19

5.1 Vérification de conception ..................................................................................... 19

5.2 Essais de type ....................................................................................................... 19

5.3 Procédure d'essai ...............................................
...

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