SIST EN 50205:2002
(Main)Relays with forcibly guided (mechanically linked) contacts
Relays with forcibly guided (mechanically linked) contacts
This European Standard 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 EN 61810-1, EN 61810-5, EN 116000-3 and EN 60255-23.
NOTE 1 This standard does not apply to electromechanical control circuit devices as described in IEC/EN 60947-5-1.
NOTE 2 EN 116000-3 is nearly equivalent to IEC 61810-7.
Relais mit (mechanisch) zwangsgeführten Kontakten
Diese Europäische Norm legt besondere Anforderungen an und Prüfungen für Elementarrelais mit zwangsgeführten Kontakten fest, die auch als mechanisch verbundene Kontakte bezeichnet werden. Diese besonderen Anforderungen gelten zusätzlich zu den allgemeinen Anforderungen von EN 61810 1, EN 61810 5, EN 116000 3 und EN 60255 23.
ANMERKUNG 1 Diese Norm gilt nicht für elektromechanische Steuerschaltungen, wie sie in IEC/EN 60947 5 1 beschrieben sind.
ANMERKUNG 2 EN 116000 3 entspricht in weitgehendem Maße IEC 61810 7.
Relais de tout ou rien à contacts guidés (liés)
Cette Norme européenne spécifie les dispositions et essais spéciaux pour les relais élémentaires à contacts guidés, aussi connus comme contacts liés mécaniquement. Ces dispositions spéciales s'appliquent en plus des dispositions générales de l'EN 61810-1, l'EN 61810-5, l'EN 116000-3 et l'EN 60255-23.
NOTE 1 Cette norme ne s'applique pas aux appareils électromécaniques pour circuits de commande comme décrits dans la CEI/EN 60947-5-1.
NOTE 2 L'EN 116000-3 est pratiquement équivalente à la CEI 61810-7.
Relays with forcibly guided (mechanically linked) contacts
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50205:2002
01-julij-2002
1DGRPHãþD
SIST EN 50205:2001
Relays with forcibly guided (mechanically linked) contacts
Relays with forcibly guided (mechanically linked) contacts
Relais mit (mechanisch) zwangsgeführten Kontakten
Relais de tout ou rien à contacts guidés (liés)
Ta slovenski standard je istoveten z: EN 50205:2002
ICS:
29.120.70 Releji Relays
SIST EN 50205:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50205:2002
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SIST EN 50205:2002
EUROPEAN STANDARD EN 50205
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2002
ICS 29.120.70 Supersedes EN 50205:1997
English version
Relays with forcibly guided (mechanically linked) contacts
Relais de tout ou rien Relais mit (mechanisch)
à contacts guidés (liés) zwangsgeführten Kontakten
This European Standard was approved by CENELEC on 2002-05-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any
other language made by translation under the responsibility of a CENELEC member into its own
language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50205:2002 E
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SIST EN 50205:2002
EN 50205:2002 - 2 -
Foreword
Following a request from the UK National Committee, the Technical Committee CENELEC
TC 94, Relays, decided to revise the standard EN 50205 and prepare a second edition.
This approach was endorsed by CENELEC Technical Board.
The text of the draft was submitted to the Unique Acceptance Procedure and was
approved by CENELEC as EN 50205 on 2002-05-01.
This European Standard supersedes EN 50205:1997.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-05-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-05-01
The contents of the standard has been amended by TC 94 in a way to
- improve the wording for better readability,
- improve the structure of the document,
- take into account other recently published standards.
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SIST EN 50205:2002
- 3 - EN 50205:2002
Introduction
This Standard applies to elementary relays in which special design and constructional
measures are used to ensure that make (normally-open) contacts can not 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.
1 Scope
This European Standard 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 EN 61810-1,
EN 61810-5, EN 116000-3 and EN 60255-23.
NOTE 1 This standard does not apply to electromechanical control circuit devices as described in
IEC/EN 60947-5-1.
NOTE 2 EN 116000-3 is nearly equivalent to IEC 61810-7.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from
other publications. These normative references are cited at the appropriate places in
the text and the publications are listed hereafter. For dated references, subsequent
amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated
references, the latest edition of the publication referred to applies.
EN 60255-23 Electrical relays
Part 23: Contact performance
EN 60947-5-1 Low-voltage switchgear and controlgear
Part 5-1: Control circuit devices and switching elements -
Electromechanical control circuit devices
EN 61810-1 Electromechanical non-specified time all-or-nothing relays
Part 1: General requirements
EN 61810-5 Electromechanical non-specified time all-or-nothing relays
Part 5: Insulation coordination
EN 116000-3 Generic specification: Electromechanical all-or-nothing relays
Part 3: Test and measurement procedures
3 Definitions
For the purposes of this standard, the following definitions apply:
3.1
elementary relay
non-specified time all-or-nothing relay
[IEV 444-01-03]
NOTE In this document the word “elementary” is sometimes omitted for clarity.
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SIST EN 50205:2002
EN 50205:2002 - 4 -
3.2
failure to open
state when a contact does not open when expected to do so
3.3
relay with forcibly guided (mechanically linked) 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
3.4
Type A
relay in which all contacts are mechanically linked
3.5
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 specified endurance 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 should be taken in the des
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