IEC 61992-3:2006

Railway applications - Fixed installations - DC switchgear - Part 3: Indoor d.c. disconnectors, switch-disconnectors and earthing switches

Specifies requirements for d.c. disconnectors, switch-disconnectors and earthing switches for use in indoor fixed installations of traction systems.

Applications ferroviaires - Installations fixes - Appareillage à courant continu - Partie 3: Interrupteurs-sectionneurs, sectionneurs et sectionneurs de terre à courant continu, pour l'intérieur

Spécifie les exigences relatives aux interrupteurs-sectionneurs, sectionneurs, et sectionneurs de terre à courant continu utilisés dans les installations fixes intérieures des systèmes de traction.

General Information

• Status: Published
• Publication Date: 06-Feb-2006
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: TC 9 - Electrical equipment and systems for railways
• Current Stage: PPUB - Publication issued
• Start Date: 07-Feb-2006
• Completion Date: 15-Apr-2006

Relations

• Amended By: IEC 61992-3:2006/AMD1:2015 - Amendment 1 - Railway applications - Fixed installations - DC switchgear - Part 3: Indoor d.c. disconnectors, switch-disconnectors and earthing switches
• Effective Date: 05-Sep-2023
• Revises: IEC 61992-3:2001 - Railway applications - Fixed installations - DC switchgear - Part 3: Indoor disconnectors and switch disconnectors
• Effective Date: 05-Sep-2023

Overview

IEC 61992-3:2006 is an international standard developed by the International Electrotechnical Commission (IEC) focused on railway applications, specifically fixed installations of DC switchgear equipment. This part 3 of IEC 61992 series details the specifications and requirements for indoor direct current (d.c.) disconnectors, switch-disconnectors, and earthing switches used in traction systems. The standard ensures the safety, reliability, and interoperability of these critical electrical components within fixed railway installations.

This standard applies to the design, construction, performance, and testing of indoor DC disconnecting devices essential for controlling electrical circuits in rail traction systems. It excludes switchgear assemblies, electromagnetic compatibility (EMC), and dependability, which are addressed in other parts of the IEC 61992 series.

Key Topics

• Scope and Purpose
  Defines technical and service requirements for indoor d.c. disconnectors, switch-disconnectors, and earthing switches tailored for fixed installations in railway traction systems.

• Device Categories and Types
  Classification of disconnectors and earthing switches based on use, rated values, operational characteristics, and control circuit requirements.

• Construction Requirements
  Mandatory features covering materials, arcing contacts, clearances, creepage distances, primary connections, manual operation means, enclosures, corrosion protection, and noise emission. Ensures devices are durable and safe for indoor environments.

• Performance Characteristics
  Details rating parameters such as voltage, current, mechanical and electrical endurance, dielectric strength, temperature-rise limits, and cooling provisions.

• Operational Aspects
  Guidelines for manual and servo-control operations of the disconnectors and earthing switches, auxiliary contacts, and safety locking mechanisms.

• Testing Procedures
  Prescribes tests for conformity assessment including dielectric tests, mechanical endurance, electrical endurance, temperature-rise, and corrosion resistance. The standard defines test sequences and performance criteria to validate device reliability.

• Marking and Documentation
  Requirements for clear marking of devices and the necessary information to be provided, aiding correct installation and maintenance.

• Relationship with Other IEC 61992 Parts
  Refers to Part 1 for general requirements applying to all DC switchgear; other parts cover outdoor devices, circuit breakers, surge arresters, and control/protection devices.

Applications

IEC 61992-3:2006 primarily caters to railway infrastructure stakeholders and manufacturers specializing in fixed DC switchgear installations. Key practical applications include:

• Railway Traction Systems
  Ensuring safe and reliable switching, isolation, and earthing operations of electrical circuits in traction substations and indoor switchgear rooms.

• Maintenance and Service Operations
  Facilitating safe disconnection and grounding during maintenance by complying with rigorous safety and operational requirements.

• Manufacturing and Quality Assurance
  Guiding manufacturers in designing compliant disconnectors and earthing switches with verified performance and endurance according to global standards.

• System Integration
  Assisting system integrators in selecting devices compatible with indoor fixed installations that meet international railway electrical standards.

By adhering to IEC 61992-3, railway operators enhance operational safety, extend equipment lifespan, and promote interoperability within traction system components.

Related Standards

IEC 61992-3 forms part of the comprehensive IEC 61992 series relevant to fixed DC switchgear in railway applications:

• IEC 61992-1: General Requirements
  Provides overarching guidelines on terminology, service conditions, testing principles, and safety for DC switchgear.

• IEC 61992-2: DC Circuit Breakers
  Specifies requirements for circuit breakers designed for DC traction system protection.

• IEC 61992-4: Outdoor DC Disconnectors and Earthing Switches
  Focuses on devices suitable for outdoor traction system environments.

• IEC 61992-5: Surge Arresters and Low-Voltage Limiters
  Details protective equipment for voltage transient mitigation in DC systems.

• IEC 61992-6: DC Switchgear Assemblies
  Covers assembly-level requirements and integration of switchgear components.

• IEC 61992-7 (parts 1-3): Measurement, Control and Protection Devices
  Applies to transducers, protection relays, and control devices specific to DC traction systems.

Additional references include IEC technical reports and specifications addressing electromagnetic compatibility and dependability of railway electrical installations.

---

Keywords: IEC 61992-3, DC switchgear, indoor disconnectors, switch-disconnectors, earthing switches, railway traction systems, fixed installations, traction substations, railway electrical standards, IEC railway standards, DC circuit isolation, railway maintenance safety.

Standards Content (Sample)

NORME CEI
INTERNATIONALE
IEC
61992-3
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2006-02
Applications ferroviaires –
Installations fixes –
Appareillage à courant continu –
Partie 3:
Interrupteurs-sectionneurs, sectionneurs et
sectionneurs de terre à courant continu,
pour l'intérieur
Railway applications –
Fixed installations –
DC switchgear –
Part 3:
Indoor d.c. disconnectors, switch-disconnectors
and earthing switches
Numéro de référence
Reference number
CEI/IEC 61992-3:2006
Numérotation des publications Publication numbering
Depuis le 1er janvier 1997, les publications de la CEI As from 1 January 1997 all IEC publications are
sont numérotées à partir de 60000. Ainsi, la CEI 34-1 issued with a designation in the 60000 series. For
devient la CEI 60034-1. example, IEC 34-1 is now referred to as IEC 60034-1.
Editions consolidées Consolidated editions
Les versions consolidées de certaines publications de la The IEC is now publishing consolidated versions of its
CEI incorporant les amendements sont disponibles. Par publications. For example, edition numbers 1.0, 1.1
exemple, les numéros d’édition 1.0, 1.1 et 1.2 indiquent and 1.2 refer, respectively, to the base publication,
respectivement la publication de base, la publication de the base publication incorporating amendment 1 and
base incorporant l’amendement 1, et la publication de the base publication incorporating amendments 1
base incorporant les amendements 1 et 2. and 2.
Informations supplémentaires Further information on IEC publications
sur les publications de la CEI
Le contenu technique des publications de la CEI est The technical content of IEC publications is kept
constamment revu par la CEI afin qu'il reflète l'état under constant review by the IEC, thus ensuring that
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cette publication, y compris sa validité, sont dispo- relating to this publication, including its validity, is
nibles dans le Catalogue des publications de la CEI available in the IEC Catalogue of publications
(voir ci-dessous) en plus des nouvelles éditions, (see below) in addition to new editions, amendments
amendements et corrigenda. Des informations sur les and corrigenda. Information on the subjects under
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NORME CEI
INTERNATIONALE
IEC
61992-3
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2006-02
Applications ferroviaires –
Installations fixes –
Appareillage à courant continu –
Partie 3:
Interrupteurs-sectionneurs, sectionneurs et
sectionneurs de terre à courant continu,
pour l'intérieur
Railway applications –
Fixed installations –
DC switchgear –
Part 3:
Indoor d.c. disconnectors, switch-disconnectors
and earthing switches
 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
CODE PRIX
R
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

– 2 – 61992-3  CEI:2006
SOMMAIRE
AVANT-PROPOS .4

1 Domaine d'application.8
2 Références normatives .8
3 Termes et définitions.8
4 Exigences de fonctionnement en service.8
5 Caractéristiques de l'unité.10
5.1 Énumération des caractéristiques .10
5.2 Type d'unité.10
5.3 Valeurs assignées .10
5.4 Catégorie d'emploi.12
5.5 Circuits de commande .14
5.6 Contacts et circuits auxiliaires.14
6 Construction .16
6.1 Généralités.16
6.2 Matériaux .16
6.3 Contacts d'arc .16
6.4 Distances d'isolement et lignes de fuite.16
6.5 Connexions primaires .16
6.6 Emplacements des connexions primaires.16
6.7 Borne de terre .18
6.8 Manœuvre manuelle .18
6.9 Enveloppes de l'unité.18
6.10 Echauffements .18
6.11 Rigidité diélectrique .20
6.12 Endurance mécanique et électrique .20
6.13 Fonctionnement.20
6.14 Protection contre la corrosion .22
6.15 Emission de bruit.22
6.16 Refroidissement .22
6.17 Servocommande (le cas échéant) .22
6.18 Autres dispositifs .22
7 Information et marquage.24
7.1 Informations .24
7.2 Marquage .24
8 Essais .24
8.1 Généralités.24
8.2 Essais applicables et séquence d'essai.26
8.3 Réalisations des essais .26

Annexe A (informative) Information nécessaire.36

Tableau 1 – Catégories d'unités .12
Tableau 2 – Liste des essais applicables et séquence .26

61992-3  IEC:2006 – 3 –
CONTENTS
FOREWORD.5

1 Scope.9
2 Normative references.9
3 Terms and definitions.9
4 Service requirements .9
5 Characteristics of the unit .11
5.1 Enumeration of the characteristics .11
5.2 Type of unit .11
5.3 Rated values .11
5.4 Class of use .13
5.5 Control circuits .15
5.6 Auxiliary contacts and circuits .15
6 Construction .17
6.1 General .17
6.2 Materials .17
6.3 Arcing contacts.17
6.4 Clearances and creepage distances.17
6.5 Primary connections .17
6.6 Location of the primary connections .17
6.7 Earthing terminal .19
6.8 Manual operation means.19
6.9 Unit enclosures.19
6.10 Temperature-rises .19
6.11 Dielectric strength.21
6.12 Electrical and mechanical endurance .21
6.13 Operation .21
6.14 Corrosion protection .23
6.15 Noise emission .23
6.16 Cooling.23
6.17 Servo-control (where applicable).23
6.18 Other facilities .23
7 Information and marking .25
7.1 Information .25
7.2 Marking .25
8 Tests .25
8.1 General .25
8.2 Applicable tests and test sequence .27
8.3 Performance of tests .27

Annex A (informative) Information required.37

Table 1 – Categories of units.13
Table 2 – List of applicable tests and sequence.27

– 4 – 61992-3  CEI:2006
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
APPLICATIONS FERROVIAIRES –
INSTALLATIONS FIXES –
APPAREILLAGE À COURANT CONTINU –

Partie 3: Interrupteurs-sectionneurs, sectionneurs et
sectionneurs de terre à courant continu, pour l'intérieur

AVANT-PROPOS
1) La CEI (Commission Electrotechnique Internationale) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a pour objet de
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responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.
La Norme internationale CEI 61992-3 a été établie par le comité d’études 9 de la CEI: Matériels
et systèmes électriques ferroviaires.
Cette seconde édition annule et remplace la première édition publiée en 2001. Cette édition
constitue une révision technique.
Cette édition comprend les modifications techniques majeures suivantes par rapport à l'édition
précédente de la norme:
– toutes les exigences et procédures qui s’appliquent à plus d’une partie de la série
CEI 61992 sont maintenant regroupées dans la Partie 1 et en conséquence les articles
correspondants de la présente partie font maintenant référence à la Partie 1;
– la liste des essais applicables a été améliorée en tenant compte de la nouvelle Partie 4.

61992-3  IEC:2006 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS –
FIXED INSTALLATIONS –
DC SWITCHGEAR –
Part 3: Indoor d.c. disconnectors, switch-disconnectors
and earthing switches
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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agreement between the two organizations.
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consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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equipment declared to be in conformity with an IEC Publication.
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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 61992-3 has been prepared by IEC technical committee 9: Electrical
equipment and systems for railways.
This second edition cancels and replaces the first edition published in 2001. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– all requirements applying to more than one part of the IEC 61992 series are now specified
in Part 1 and consequently the related clauses in this part of the series now make reference
to Part 1;
– the list of applicable tests has been improved taking into account the new Part 4.

– 6 – 61992-3  CEI:2006
Le texte de la présente norme est issu de l’EN 50123-3 ainsi que des documents suivants:
FDIS Rapport de vote
9/888/FDIS 9/910/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de la présente Norme.
Cette publication a été rédigée selon les Directives ISO/CEI, Partie 2.
La CEI 61992 comprend les parties suivantes, présentées sous le titre général Applications
ferroviaires – Installations fixes – Appareillage à courant continu:
Partie 1: Généralités
Partie 2: Disjoncteurs en courant continu
Partie 3: Interrupteurs-sectionneurs, sectionneurs et sectionneurs de terre à courant
continu, pour l'intérieur
Partie 4: Interrupteurs-sectionneurs, sectionneurs et sectionneurs de terre à courant
continu, pour usage extérieur
Partie 5: Parafoudres et limiteurs de tension pour usage spécifique dans les systèmes de
traction à courant continu
Partie 6: Ensembles d’appareillage à courant continu
Partie 7-1: Appareils de mesure, de contrôle et de protection pour usage spécifique dans les
systèmes de traction à courant continu – Guide d'application
Partie 7-2: Appareils de mesure, de contrôle et de protection pour usage spécifique dans les
systèmes de traction à courant continu – Transducteurs de courant d’isolement et
autres appareils de mesure du courant
Partie 7-3: Appareils de mesure, de contrôle et de protection pour usage spécifique dans les
systèmes de traction à courant continu – Transducteurs de tension d’isolement et
autres appareils de mesure de la tension
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant la date de
maintenance indiquée sur le site web de la CEI sous «http://webstore.iec.ch» dans les données
relatives à la publication recherchée. A cette date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
• amendée.
61992-3  IEC:2006 – 7 –
The text of this standard is based on EN 50123-3 and the following documents:
FDIS Report on voting
9/888/FDIS 9/910/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61992 consists of the following parts, under the general title Railway applications – Fixed
installations – DC switchgear:
Part 1: General
Part 2: DC circuit breakers
Part 3: Indoor d.c. disconnectors, switch-disconnectors and earthing switches
Part 4: Outdoor d.c. disconnectors, switch-disconnectors and earthing switches
Part 5: Surge arresters and low-voltage limiters for specific use in d.c. systems
Part 6: DC switchgear assemblies
Part 7-1: Measurement, control and protection devices for specific use in d.c. traction
systems – Application guide
Part 7-2: Measurement, control and protection devices for specific use in d.c. traction
systems – Isolating current transducers and other current measuring devices
Part 7-3: Measurement, control and protection devices for specific use in d.c. traction
systems – Isolating voltage transducers and other voltage measuring devices
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site 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.
– 8 – 61992-3  CEI:2006
APPLICATIONS FERROVIAIRES –
INSTALLATIONS FIXES –
APPAREILLAGE À COURANT CONTINU –

Partie 3: Interrupteurs-sectionneurs, sectionneurs et
sectionneurs de terre à courant continu, pour l'intérieur

1 Domaine d'application
La présente partie de la CEI 61992 spécifie les exigences relatives aux interrupteurs-
sectionneurs, sectionneurs, et sectionneurs de terre à courant continu utilisés dans les
installations fixes intérieures des systèmes de traction.
NOTE 1 Les ensembles d'appareillage, la compatibilité électromagnétique (CEM) et la disponibilité ne sont pas
couvertes dans la présente norme, mais par d'autres parties de cette série ou par d'autres documents comme
indiqués dans la CEI 61992-1.
NOTE 2 Dans la présente norme, le mot «unité» signifie «sectionneur et/ou interrupteur-sectionneur et/ou
sectionneur de terre» selon la définition donnée aux paragraphes 3.1.5, 3.1.6 et 3.1.7 de la CEI 61992-1.
NOTE 3 Les sectionneurs, interrupteurs-sectionneurs et sectionneurs de terre peuvent être dotés de mécanismes
à accrochage électrique et, dans ce cas, peuvent être qualifiés du terme courant de «contacteur de puissance».
2 Références normatives
Les documents de référence suivants sont indispensables pour l'application du présent
document. Pour les références datées, seule l'édition citée s'applique. Pour les références non
datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
CEI 60694:1996, Spécifications communes aux normes de l’appareillage à haute tension
CEI 60850:2000, Applications ferroviaires – Tensions d'alimentation des réseaux de traction
CEI 61992-1:2006, Applications ferroviaires – Installations fixes – Appareillage à courant
continu – Partie 1: Généralités
CEI 61992-6:2006, Applications ferroviaires – Installations fixes – Appareillage à courant
continu – Partie 6: Ensembles d’appareillage à courant continu
EN 50124-1:2001, Applications ferroviaires – Coordination de l’isolement – Partie 1:
Prescriptions fondamentales – Distances d’isolement dans l’air et lignes de fuite pour tout
matériel électrique et électronique
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions donnés dans la CEI 61992-1
s'appliquent.
4 Exigences de fonctionnement en service
Les conditions d'environnement applicables aux matériels traités dans la présente norme sont
couvertes par 4.1 de la CEI 61992-1.

61992-3  IEC:2006 – 9 –
RAILWAY APPLICATIONS –
FIXED INSTALLATIONS –
DC SWITCHGEAR –
Part 3: Indoor d.c. disconnectors, switch-disconnectors
and earthing switches
1 Scope
This part of IEC 61992 specifies requirements for d.c. disconnectors, switch-disconnectors and
earthing switches for use in indoor fixed installations of traction systems.
NOTE 1 Switchgear assemblies, electromagnetic compatibility (EMC) and dependability are not covered in this
standard, but rather by other parts of the IEC 61992 series or other documents as indicated in IEC 61992-1.
NOTE 2 In this standard, the word "unit" means "disconnector and/or switch-disconnector and/or earthing switch"
as defined in 3.1.5, 3.1.6 and 3.1.7 of IEC 61992-1.
NOTE 3 Disconnectors, switch-disconnectors and earthing switches may have electrically latched mechanisms
and, in such cases, may be indicated with the current term of "power contactors".
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 60694:1996, Common specifications for high-voltage switchgear and controlgear standards
IEC 60850:2000, Railway applications – Supply voltage of traction systems
IEC 61992-1:2006, Railway applications – Fixed installations – DC switchgear – Part 1:
General
IEC 61992-6:2006, Railway applications – Fixed installations – DC switchgear – Part 6:
DC switchgear assemblies
EN 50124-1:2001, Railway applications – Insulation coordination – Part 1: Basic requirements
– Clearances and creepage distances for electrical and electronic equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61992-1 apply.
4 Service requirements
Environmental conditions applicable to the equipment discussed in this standard are covered in
4.1 of IEC 61992-1.
– 10 – 61992-3  CEI:2006
5 Caractéristiques de l'unité
5.1 Énumération des caractéristiques
Les caractéristiques de l'unité et ses désignations et valeurs assignées (le cas échéant) sont
les suivantes:
– type d'appareil (5.2);
– valeurs assignées (5.3);
– catégorie d'emploi (5.4);
– circuits de commande (5.5);
– circuits auxiliaires (5.6).
5.2 Type d'unité
Une unité doit être définie par les particularités suivantes selon le cas:
– si l'unité est un interrupteur-sectionneur, un sectionneur, un sectionneur de terre ou une
combinaison de ces types;
– nombre de pôles;
– nombre de positions (s'il y en a plus de deux);
– présence d'une enveloppe;
– degré de protection assuré par l'enveloppe (voir 3.3.29 de la CEI 61992-1).
5.3 Valeurs assignées
5.3.1 Généralités
Les valeurs des caractéristiques assignées doivent être spécifiées par l'acheteur. Les valeurs
des tensions nominales doivent être choisies parmi celles du Tableau 1 de la CEI 61992-1; et il
convient de prendre les valeurs du courant parmi les valeurs préférentielles de 5.1.2 de la
CEI 61992-1.
Ces valeurs doivent être confirmées par le fabricant, qui doit indiquer les valeurs assignées
pour le type d'unité proposée, et elles doivent être complétées par d'autres données.
Toutes ces valeurs sont à stipuler selon 5.3.2 à 5.3.4, mais il n'est pas nécessaire de spécifier
toutes les valeurs assignées énumérées.
5.3.2 Tensions
Une unité est définie par les tensions suivantes:
– tension nominale U (voir la CEI 60850);
n
– tensions et limites du système (voir 3.2.1.2 et 5.1.3 de la CEI 61992-1);
– tension assignée U (voir 3.2.1.4 de la CEI 61992-1);
Ne
– tension d'isolement assignée U (voir 3.2.1.3 de la CEI 61992-1). Elle doit être égale ou
Nm
supérieure à U ;
max
– tension assignée de tenue aux chocs U (voir 3.2.1.7 de la CEI 61992-1);
Ni
– niveau de tenue de la tension à fréquence industrielle U (voir 3.2.1.8 de la CEI 61992-1);
a
– tensions assignées d'alimentation auxiliaire et de commande (voir 3.2.1.5 de la
CEI 61992-1).
61992-3  IEC:2006 – 11 –
5 Characteristics of the unit
5.1 Enumeration of the characteristics
The characteristics of the unit and its assigned designations and values (where applicable) are
covered as follows:
– type of unit (5.2);
– rated values (5.3);
– class of use (5.4);
– control circuits (5.5);
– auxiliary circuits (5.6).
5.2 Type of unit
A unit shall be defined by the following details as applicable:
– whether the unit is a switch-disconnector, disconnector, earthing switch or a combination of
these types;
– number of poles;
– number of positions (if there are more than two);
– provision of an enclosure;
– degree of protection provided by the enclosure (see 3.3.29 of IEC 61992-1).
5.3 Rated values
5.3.1 General
The rated characteristic values shall be specified by the purchaser. Nominal voltage values
shall be selected from the values indicated in Table 1 in IEC 61992-1; current values should
have one of the preferred values in 5.1.2 of IEC 61992-1.
These values shall be confirmed by the manufacturer, who shall indicate the rated values for
the type of unit proposed, and shall be complemented with other data.
All these values shall be stipulated in accordance with 5.3.2 to 5.3.4, but it is not necessary to
specify all the listed rated values.
5.3.2 Voltages
A unit is defined by the following voltages:
– nominal voltage U (see IEC 60850);
n
– system voltages and limits (see 3.2.1.2 and 5.1.3 of IEC 61992-1);
– rated voltage U (see 3.2.1.4 of IEC 61992-1);
Ne
– rated insulation voltage U (see 3.2.1.3 of IEC 61992-1). It shall be equal to or higher
Nm
than U ;
max
– rated impulse withstand voltage U (see 3.2.1.7 of IEC 61992-1);
Ni
– power-frequency voltage withstand level U (see 3.2.1.8 of IEC 61992-1);
a
– rated auxiliary and control supply voltages (see 3.2.1.5 of IEC 61992-1).

– 12 – 61992-3  CEI:2006
5.3.3 Courants
Une unité est définie par les courants suivants:
– courant thermique conventionnel I , I (voir 3.2.3 et 3.2.4 de la CEI 61992-1);
th the
NOTE 1 Cette caractéristique assignée n'est pas demandée aux sectionneurs de terre.
– courant assigné de service I (voir 3.2.5 de la CEI 61992-1);
Ne
NOTE 2 Cette caractéristique assignée n'est pas demandée aux sectionneurs de terre.
– pouvoirs de coupure et de fermeture assignés (voir 3.2.18 et 3.2.22 de la CEI 61992-1);
• Les interrupteurs-sectionneurs et les sectionneurs pour lesquels le fabricant déclare un
pouvoir de fermeture doivent être capables d'établir le courant présumé fixé à une
tension U égale à 1,2 × U .
Ne
• Un pouvoir de coupure assigné exige que l'unité soit capable d'interrompre tout courant
d'une valeur inférieure ou égale à ce pouvoir de coupure assigné.
– courant assigné de courte durée admissible I (voir 3.2.7 de la CEI 61992-1);
Ncw
NOTE 3 Il n'est pas nécessaire que les courants assignés de courte durée I aient la même valeur que le
Ncw
courant assigné de court-circuit I .
Nss
– capacité de surcharge: l'acheteur doit informer le fournisseur des exigences relatives aux
cycles de fonctionnement (voir la CEI 61992-1, 3.2.5, note 2).
5.4 Catégorie d'emploi
Les sectionneurs doivent se fermer et s'ouvrir sans charge, sauf déclaration contraire du
fabricant.
Les interrupteurs-sectionneurs doivent se fermer et s'ouvrir en charge, y compris avec des
charges fortement inductives.
Les deux systèmes doivent disposer de mécanismes à accrochage, soit électrique, soit
mécanique.
Les courants minimaux de coupure, de fermeture et de courte durée admissibles des unités
doivent être au moins égaux aux valeurs du Tableau 1 pour la catégorie appropriée.
Tableau 1 – Catégories d'unités
Catégorie Pouvoirs Courant de courte durée admissible
(avec t ≥ 0,01 s)
c
Fermeture Coupure Courant Durée
I 0 0 I / I 0,25 s
Ncw Ncwe
II 0 I I 0,25 s
Ne Ncw
III 0,25 s
I I I
Ne Ne Ncw
IV 0,25 s
3 I 3 I I
Ne Ne Ncw
V 0 0,25 s
I I / I
Nss Ncw Ncwe
VI I 3 I I 0,25 s
Nss Ne Ncw
61992-3  IEC:2006 – 13 –
5.3.3 Currents
A unit is defined by the following currents:
– conventional thermal current I , I (see 3.2.3 and 3.2.4 of IEC 61992-1);
th the
NOTE 1 Earthing switches are not required to be assigned this rating.
– rated service current I (see 3.2.5 of IEC 61992-1);
Ne
NOTE 2 Earthing switches are not required to be assigned this rating.
– rated breaking and making capacities (see 3.2.18 and 3.2.22 of IEC 61992-1);
• Switch-disconnectors and those disconnectors for which the manufacturer declares a
making capacity, shall be able to make the stated prospective current at a voltage U
equal to 1,2 × U .
Ne
• A rated breaking capacity requires the unit to be able to interrupt any current of a value
lower than or equal to this rated breaking capacity.
– rated short-time withstand current I (see 3.2.7 of IEC 61992-1);
Ncw
NOTE 3 Rated short-time currents I need not have the same value as the rated short-circuit current I .
Ncw Nss
– overload capability: the purchaser shall inform the supplier of the load cycle requirements
(see 3.2.5, Note 2, of IEC 61992-1).
5.4 Class of use
Disconnectors shall close and open at no-load except if otherwise declared by the
manufacturer.
Switch-disconnectors shall close and open on-load, including highly inductive loads.
Both devices shall have either electrically latched or mechanically latched mechanisms.
The minimum breaking, making and short-time withstand currents of the units shall be at least
those in Table 1 for the appropriate category.
Table 1 – Categories of units
Category Capacities Short-time withstand current
(with t ≥ 0,01 s)
c
Making Breaking Current Duration
I 0 0 I / I 0,25 s
ncw Ncwe
II 0 I I 0,25 s
Ne Ncw
III I I I 0,25 s
Ne Ne Ncw
IV 3 I 3 I I 0,25 s
Ne Ne Ncw
V I 0 I / I 0,25 s
Nss ncw Ncwe
VI I 3 I I 0,25 s
Nss Ne Ncw
– 14 – 61992-3  CEI:2006
Tableau 1 (suite)
NOTE 1 Sauf spécification contraire, I a les mêmes caractéristiques assignées que I ou que I
Nss Ncw Ncwe
pour les sectionneurs de terre.
NOTE 2 Une application-type des catégories ci-dessus est la suivante:
Catégorie I: Sectionneur et sectionneur de terre utilisés dans les emplacements où l'acheteur a pris
toutes les précautions pour empêcher une fermeture sur un courant de défaut.
Catégorie II: Interrupteur-sectionneur adapté à la coupure du courant de charge uniquement.
Catégorie III: Interrupteur-sectionneur en série avec la ligne d'alimentation, adapté à la fermeture et à la
coupure du courant assigné uniquement.
Catégorie IV: Interrupteur-sectionneur comme en III, mais adapté à la fermeture et à la coupure du
courant de démarrage du train.
Catégorie V: Sectionneur et sectionneur de terre utilisé dans les emplacements où il y a une possibilité
de fermeture involontaire sur un courant de défaut.
Catégorie VI: Interrupteur-sectionneur comme en IV mais adapté à la fermeture sur un courant de
défaut.
NOTE 3 Pour la définition de t : voir 3.2.13 de la CEI 61992-1.
c
NOTE 4 Pour les sectionneurs de terre, se référer à 8.3.4.3 de la CEI 61992-6 pour déterminer la valeur
de I dont il convient que la valeur minimale ininterrompue soit de 10 kA.
Ncwe
5.5 Circuits de commande
Les circuits de commande sont identifiés par les données suivantes:
– la tension des circuits de commande;
– le type de courant (continu ou alternatif);
– la fréquence, en cas de courant alternatif.
La tension de la source d'alimentation et sa fréquence sont les valeurs sur lesquelles sont
basées les performances, le comportement thermique et les caractéristiques d'isolement.
Sauf spécification contraire, la tension doit être conforme à 5.2 de la CEI 61992-1, et la tension
d'isolement assignée, à l’EN 50124-1.
La tension d'alimentation doit être comprise entre 85 % et 110 % de la tension spécifiée,
conformément à 5.2 de la CEI 61992-1.
Lorsque la tension de commande est la même que dans le circuit principal, les mêmes
variations que celles du circuit principal s'appliquent.
Le fabricant doit indiquer les valeurs de l'intensité du courant prélevé par les circuits de
commande à la tension spécifiée. Dans le cas où les circuits de commande prélèvent le
courant de manière intermittente, la durée de conduction du courant doit être précisée.
5.6 Contacts et circuits auxiliaires
Les circuits auxiliaires sont principalement définis par le nombre de contacts fournis, leurs
caractéristiques assignées (courant thermique et tension) et leurs caractéristiques (NO ou NC
ou commutation). Sauf spécification contraire, la tension assignée doit être conforme à 5.2 de
la CEI 61992-1 et la tension d'isolement assignée, à l’EN 50124-1.
L'acheteur doit spécifier le nombre minimal de contacts auxiliaires requis.

61992-3  IEC:2006 – 15 –
Table 1 (continued)
NOTE 1 Unless otherwise specified I has the same rating as I or, for earthing switches, I .
Nss Ncw Ncwe
NOTE 2 A typical application of the above categories is the following:
Category I: Disconnector and earthing switch used in locations where the purchaser has taken all
precautions to inhibi
...

IEC 61992-3 ®
Edition 2.1 2015-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Railway applications – Fixed installations – DC switchgear –
Part 3: Indoor d.c. disconnectors, switch-disconnectors and earthing switches

Applications ferroviaires – Installations fixes – Appareillage à courant continu –
Partie 3: Interrupteurs-sectionneurs, sectionneurs et sectionneurs de terre à
courant continu, pour l'intérieur

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IEC 61992-3 ®
Edition 2.1 2015-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Railway applications – Fixed installations – DC switchgear –

Part 3: Indoor d.c. disconnectors, switch-disconnectors and earthing switches

Applications ferroviaires – Installations fixes – Appareillage à courant continu –

Partie 3: Interrupteurs-sectionneurs, sectionneurs et sectionneurs de terre à

courant continu, pour l'intérieur

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 45.060 ISBN 978-2-8322-2945-3

IEC 61992-3 ®
Edition 2.1 2015-09
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Railway applications – Fixed installations – DC switchgear –
Part 3: Indoor d.c. disconnectors, switch-disconnectors and earthing switches

Applications ferroviaires – Installations fixes – Appareillage à courant continu –
Partie 3: Interrupteurs-sectionneurs, sectionneurs et sectionneurs de terre à
courant continu, pour l'intérieur

– 2 – IEC 61992-3:2006+AMD1:2015 CSV
 IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
4 Service requirements . 5
5 Characteristics of the unit . 6
5.1 Enumeration of the characteristics . 6
5.2 Type of unit . 6
5.3 Rated values . 6
5.4 Class of use . 7
5.5 Control circuits . 8
5.6 Auxiliary contacts and circuits . 9
6 Construction . 9
6.1 General . 9
6.2 Materials . 9
6.3 Arcing contacts . 9
6.4 Clearances and creepage distances . 9
6.5 Primary connections . 9
6.6 Location of the primary connections . 9
6.7 Earthing terminal . 10
6.8 Manual operation means . 10
6.9 Unit enclosures . 10
6.10 Temperature-rises . 10
6.11 Dielectric strength . 10
6.12 Electrical and mechanical endurance . 11
6.13 Operation . 11
6.14 Corrosion protection . 12
6.15 Noise emission . 12
6.16 Cooling . 12
6.17 Servo-control (where applicable) . 12
6.18 Other facilities . 12
7 Information and marking . 12
7.1 Information . 12
7.2 Marking . 12
8 Tests . 13
8.1 General . 13
8.2 Applicable tests and test sequence . 13
8.3 Performance of tests . 14
Annex A (informative) Information required . 19

Table 1 – Categories of units . 8
Table 2 – List of applicable tests and sequence . 14

 IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS –
FIXED INSTALLATIONS –
DC SWITCHGEAR –
Part 3: Indoor d.c. disconnectors, switch-disconnectors
and earthing switches
FOREWORD
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This consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 61992-3 edition 2.1 contains the first edition (2006-02) [documents 9/888/FDIS and 9/910/
RVD] and its amendment 1 (2015-09) [documents 9/2017/CDV and 9/2066/RVC].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red text. A
separate Final version with all changes accepted is available in this publication.

– 4 – IEC 61992-3:2006+AMD1:2015 CSV
 IEC 2015
International Standard IEC 61992-3 has been prepared by IEC technical committee 9: Electrical
equipment and systems for railways.
This edition includes the following significant technical changes with respect to the previous
edition:
– all requirements applying to more than one part of the IEC 61992 series are now specified
in Part 1 and consequently the related clauses in this part of the series now make reference
to Part 1;
– the list of applicable tests has been improved taking into account the new Part 4.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61992 consists of the following parts, under the general title Railway applications – Fixed
installations – DC switchgear:
Part 1: General
Part 2: DC circuit breakers
Part 3: Indoor d.c. disconnectors, switch-disconnectors and earthing switches
Part 4: Outdoor d.c. disconnectors, switch-disconnectors and earthing switches
Part 5: Surge arresters and low-voltage limiters for specific use in d.c. systems
Part 6: DC switchgear assemblies
Part 7-1: Measurement, control and protection devices for specific use in d.c. traction
systems – Application guide
Part 7-2: Measurement, control and protection devices for specific use in d.c. traction
systems – Isolating current transducers and other current measuring devices
Part 7-3: Measurement, control and protection devices for specific use in d.c. traction
systems – Isolating voltage transducers and other voltage measuring devices
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability date indicated on the IEC web site 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

 IEC 2015
RAILWAY APPLICATIONS –
FIXED INSTALLATIONS –
DC SWITCHGEAR –
Part 3: Indoor d.c. disconnectors, switch-disconnectors
and earthing switches
1 Scope
This part of IEC 61992 specifies requirements for d.c. disconnectors, switch-disconnectors and
earthing switches for use in indoor fixed installations of traction systems.
NOTE 1 Switchgear assemblies, electromagnetic compatibility (EMC) and dependability are not covered in this
standard, but rather by other parts of the IEC 61992 series or other documents as indicated in IEC 61992-1.
NOTE 2 In this standard, the word "unit" means "disconnector and/or switch-disconnector and/or earthing switch"
as defined in 3.1.5, 3.1.6 and 3.1.7 of IEC 61992-1.
NOTE 3 Disconnectors, switch-disconnectors and earthing switches may have electrically latched mechanisms
and, in such cases, may be indicated with the current term of "power contactors".
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 60694:1996, Common specifications for high-voltage switchgear and controlgear standards
IEC 60850:2000, Railway applications – Supply voltage of traction systems
IEC 61992-1:2006, Railway applications – Fixed installations – DC switchgear – Part 1:
General
IEC 61992-6:2006, Railway applications – Fixed installations – DC switchgear – Part 6:
DC switchgear assemblies
EN 50124-1:2001, Railway applications – Insulation coordination – Part 1: Basic requirements
– Clearances and creepage distances for electrical and electronic equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61992-1 apply.
4 Service requirements
Environmental conditions applicable to the equipment discussed in this standard are covered in
4.1 of IEC 61992-1.
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5 Characteristics of the unit
5.1 Enumeration of the characteristics
The characteristics of the unit and its assigned designations and values (where applicable) are
covered as follows:
– type of unit (5.2);
– rated values (5.3);
– class of use (5.4);
– control circuits (5.5);
– auxiliary circuits (5.6).
5.2 Type of unit
A unit shall be defined by the following details as applicable:
– whether the unit is a switch-disconnector, disconnector, earthing switch or a combination of
these types;
– number of poles;
– number of positions (if there are more than two);
– provision of an enclosure;
– degree of protection provided by the enclosure (see 3.3.29 of IEC 61992-1).
5.3 Rated values
5.3.1 General
The rated characteristic values shall be specified by the purchaser. Nominal voltage values
shall be selected from the values indicated in Table 1 in IEC 61992-1; current values should
have one of the preferred values in 5.1.2 of IEC 61992-1.
These values shall be confirmed by the manufacturer, who shall indicate the rated values for
the type of unit proposed, and shall be complemented with other data.
All these values shall be stipulated in accordance with 5.3.2 to 5.3.4, but it is not necessary to
specify all the listed rated values.
5.3.2 Voltages
A unit is defined by the following voltages:
– nominal voltage U (see IEC 60850);
n
– system voltages and limits (see 3.2.1.2 and 5.1.3 of IEC 61992-1);
– rated voltage U (see 3.2.1.4 of IEC 61992-1);
Ne
– rated insulation voltage U (see 3.2.1.3 of IEC 61992-1). It shall be equal to or higher
Nm
than U ;
max
– rated impulse withstand voltage U (see 3.2.1.7 of IEC 61992-1);
Ni
– power-frequency voltage withstand level U (see 3.2.1.8 of IEC 61992-1);
a
– rated auxiliary and control supply voltages (see 3.2.1.5 of IEC 61992-1).
5.3.3 Currents
A unit is defined by the following currents:

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– conventional thermal current I , I (see 3.2.3 and 3.2.4 of IEC 61992-1);
th the
NOTE 1 Earthing switches are not required to be assigned this rating.
– rated service current I (see 3.2.5 of IEC 61992-1);
Ne
NOTE 2 Earthing switches are not required to be assigned this rating.
– rated breaking and making capacities (see 3.2.18 and 3.2.22 of IEC 61992-1);
• Switch-disconnectors and those disconnectors for which the manufacturer declares a
making capacity, shall be able to make the stated prospective current at a voltage U
equal to 1,2 × U .
Ne
• A rated breaking capacity requires the unit to be able to interrupt any current of a value
lower than or equal to this rated breaking capacity.
– rated short-time withstand current I (see 3.2.7 of IEC 61992-1);
Ncw
NOTE 3 Rated short-time currents I need not have the same value as the rated short-circuit current I .
Ncw Nss
– overload capability: the purchaser shall inform the supplier of the load cycle requirements
(see 3.2.5, Note 2, of IEC 61992-1).
5.4 Class of use
Disconnectors shall close and open at no-load except if otherwise declared by the
manufacturer.
Switch-disconnectors shall close and open on-load, including highly inductive loads.
Both devices shall have either electrically latched or mechanically latched mechanisms.
The minimum breaking, making and short-time withstand currents of the units shall be at least
those in Table 1 for the appropriate category.

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 IEC 2015
Table 1 – Categories of units
Category Capacities Short-time withstand current
(with t ≥ 0,01 s)
c
Making Breaking Current Duration
I 0 0 0,25 s
I / I
ncw Ncwe
II 0 0,25 s
I I
Ne Ncw
III I I 0,25 s
I
Ne Ne Ncw
IV 3 I 3 I I 0,25 s
Ne Ne Ncw
V I 0 I / I 0,25 s
Nss ncw Ncwe
VI I 3 I I 0,25 s
Nss Ne Ncw
NOTE 1 Unless otherwise specified I has the same rating as I or, for earthing switches, I .
Nss Ncw Ncwe
NOTE 2 A typical application of the above categories is the following:
Category I: Disconnector and earthing switch used in locations where the purchaser has taken all
precautions to inhibit making on to a fault current.
Category II: Switch disconnector required for breaking load current only.
Category III: Switch-disconnector in series with the feeder, required for making and breaking the rated
current only.
Category IV: Switch-disconnector as in III, but required for making and breaking the train starting
current.
Category V: Disconnector and earthing switch used in locations where the possibility exists of an
inadvertent make on to a fault current.
Category VI: Switch-disconnector as in IV, but required for making on to a fault current.
NOTE 3 For definition of t see 3.2.13 of IEC 61992-1.
c
NOTE 4 For earthing switches, refer to 8.3.4.3 of IEC 61992-6 to establish the value of I which
Ncwe
should be 10 kA sustained as a minimum.

5.5 Control circuits
The control circuits are identified by the following:
– the voltage of the control circuits;
– the kind of current (d.c. or a.c.);
– the frequency, in case of a.c.
The voltage of the supply source and its frequency are the values on which the performance,
the thermal behaviour and the insulation characteristics are based.
Unless otherwise required, the voltage shall be in accordance with 5.2 of IEC 61992-1 and the
rated insulation voltage shall be in accordance with EN 50124-1.
The supply voltage shall be within a range between 85 % and 110 % of the specified voltage
according to 5.2 of IEC 61992-1.
When the control voltage is the same as in the main circuit, the same variations as in the main
circuit apply.
The manufacturer shall indicate the value(s) of the current drawn by the control circuits at the
specified voltage. In case of control circuits which draw current intermittently, the duration of
the current flow shall be given.

 IEC 2015
5.6 Auxiliary contacts and circuits
Auxiliary circuits are mainly defined by the number of contacts provided, their rating (thermal
current and voltage) and by their characteristics (NO, NC or commutation). Unless otherwise
required, the rated voltage shall be in accordance with 5.2 of IEC 61992-1, and the rated
insulation voltage shall be in accordance with EN 50124-1.
The purchaser shall specify the minimum number of auxiliary contacts required.
The auxiliary wiring connected to a circuit at 1 000 V a.c. or 1 500 V d.c. or above shall be
physically separated from those connected to a circuit at a voltage below these limits.
For other characteristics of the auxiliary circuits, the requirements of 5.5 apply.
6 Construction
6.1 General
All apparatus and connections required for the safe and satisfactory operation, control and
protection of the equipment concerned, shall be provided, whether or not specifically
mentioned. The equipment shall be earthed, insulated, screened or enclosed as may be
appropriate to ensure the protection of the equipment and the safety of those concerned in its
operation and maintenance.
Control and auxiliary circuits and contacts shall comply with the requirements of 5.2 of
IEC 61992-1.
6.2 Materials
No materials containing asbestos shall be used in the construction of the units.
NOTE Special attention should be paid to the ability of the material used to resist moisture and fire: materials
used should be of the self-extinguishing type, so that the risk of propagation of fire from one cubicle to another is
minimised (see Annex B of IEC 61992-1).
6.3 Arcing contacts
Arcing contacts, if any, which are liable to be consumed during arc interruption shall be easy to
replace.
6.4 Clearances and creepage distances
Clearances and creepage distances shall not be lower than those indicated in Table 1 of
IEC 61992-1 and Annex D of IEC 61992-1 respectively.
NOTE Clearance and creepage distances may be increased to take into account the presence of foreign
substances after the number of operations, in normal and short-circuit conditions, occurring during the normal life-
span between cleaning procedures.
Where applicable, ribs shall be provided in order to break the continuity of conducting deposit
which occurs during operation.
6.5 Primary connections
The units shall be equipped with fixed, removable (bolted or clamped) or plug-in coupling.
6.6 Location of the primary connections
For non-withdrawable units, the terminals for the primary connections shall be accessible with
the unit as in its normal operating position.

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 IEC 2015
For withdrawable units, the terminals for the primary connections shall be accessible in the
conditions detailed in IEC 61992-6.
6.7 Earthing terminal
The frames, the structure and the fixed parts of the metallic enclosures shall be connected to
each other and to a suitable earthing terminal, placed in an accessible position, in order to
allow earthing.
NOTE 1 This condition may be fulfilled by normal construction elements ensuring an adequate electric continuity.
For withdrawable units, the earth connection shall be made before the shutters are opened,
and the shutters shall be closed before the earth connection is disconnected.
NOTE 2 The purchaser may require a dedicated earth connection for this purpose. For non-dedicated earth
connections, any bolt or similar fixing used for earth continuity, the maintenance instructions should state the
requirements for cleaning the surfaces and ensuring tightness.
The earthing terminal shall be suitably protected against corrosion. The standard earth symbol
shall be adequately and permanently marked.
for 0,25 s
The earthing terminal shall be capable of carrying the rated earth fault current I
Ncwe
(see 8.3.4.3 of IEC 61992-6).
6.8 Manual operation means
All units shall be provided with a manual closing handle for service, emergency and/or
maintenance use as indicated in 6.13.1.
6.9 Unit enclosures
Unit enclosures shall conform with the requirements of IEC 61992-6.
6.10 Temperature-rises
6.10.1 Limits
The temperature shall not rise by more than the values given in Clause 6 of IEC 61992-1.
6.10.2 Main circuit
The main circuit of a unit, including all electrically connected parts, shall withstand its rated
currents I , I or I . It shall also comply with the overcurrent load cycle which may be
Ne th the
specified by the purchaser (see 3.2.5, Note 2, of IEC 61992-1).
6.10.3 Control circuit
The control circuit, as well as the control devices, used for the opening and closing operations
of a unit shall not exceed the rated temperature-rise limits during their operation.
6.10.4 Auxiliary circuits
The auxiliary circuits, as well as the auxiliary devices, shall withstand their conventional
thermal current (for switching devices) or their rated service current (for other equipment),
without exceeding the rated temperature-rise limits.
6.11 Dielectric strength
Dielectric strength shall conform to the values stipulated in Table 1 in IEC 61992-1.

 IEC 2015
6.12 Electrical and mechanical endurance
The unit shall be capable of carrying out the following number of operations when tested in
accordance with 7.3.2 and 7.3.3 of IEC 61992-1:
a) To check mechanical endurance, without current in the main circuit, the following operating
cycles shall be performed:
dependent manually operated units only: 100;
units used in place of a rectifier circuit-breaker R or an interconnecting circuit-breaker I:
4 000;
units used in place of a line circuit-breaker L: 20 000 or 10 000;
NOTE The value of 20 000 cycles is recommended when two or more operations per day are expected.
other units: as stated by the manufacturer;
b) To check electrical endurance, with the rated service current I in the main circuit, the
Ne
following operating cycles shall be performed (see 8.3.5):
1) switch-disconnectors: 50 minimum;
2) disconnectors: as stated by the manufacturer.
The test shall consist of carrying out the above number of operating cycles in groups of no less
than 10 CO operations at no greater than 180 s intervals. For current ratings higher than
4 000 A, the group number may be reduced subject to agreement between purchaser and
supplier.
6.13 Operation
6.13.1 Opening and closing operations
The following operation types exist:
a) manually dependent operated units;
b) power-operated units with no manual back-up;
c) manually non-dependent units;
d) power-operated units with non-dependent manual back-up;
e) power-operated units with dependent manual back-up.
The units given in items b), c) and d) may be either disconnectors or switch-disconnectors.
The units given in items a) and e) are disconnectors only.
The units given in items a) and c) shall be provided with a service handle. The units given in d)
shall have an emergency handle. All units shall be equipped with facilities for manual closing
during maintenance procedures.
The purchaser shall specify the operation type required.
For power-operated units, the operation shall operate correctly for any voltage value as
indicated in 5.5.
Earthing switches shall not employ mechanisms of types a) and e).
6.13.2 Padlock
If a padlock system is provided for locking in one or several positions, preventing any
unauthorised operation, this unit shall be designed to receive padlocks, the number and the
characteristics of which are indicated by the purchaser.

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 IEC 2015
6.14 Corrosion protection
Steelwork and other materials of the equipment shall be treated in accordance with an
approved type of corrosion protection except for arc-extinguishing sheets in the arc chute.
Purchasers may have their own specification, in which case the supplier shall either comply or
offer an equivalent specification.
6.15 Noise emission
Noise emission from all equipment shall be minimised. The level of the noise emission during
breaking of its rated service current I , shall be given by the supplier, if required by the
Ne
purchaser.
6.16 Cooling
Unless otherwise agreed between purchaser and supplier, all equipment is expected to be
naturally cooled.
6.17 Servo-control (where applicable)
The servo-control shall be mounted either on the unit or on a structure on which the unit is also
mounted. This structure shall be earthed.
6.18 Other facilities
The units shall have the following facilities:
a) a latching device either electrical, magnetic or mechanical;
b) a mechanical indicator coupled to the moving contact, or equivalent means, to indicate the
“closed” and the “open” conditions of the unit. Symbols “I” and “O” or “ON” and “OFF” shall
be used to indicate the closed and open positions respectively; this indicator is not
compulsory when the isolating distance or gap on the unit is visible with the unit in the
installation conditions;
c) means for earthing the unit structure either through a moving contact or a terminal.
Units may have an operation counter.
In addition to the number of auxiliary switch contacts required for normal operating circuits of
the unit, the manufacturer shall provide an additional two contacts for remote control and
monitoring circuits. The number and type of contacts in addition to these shall be subject to
agreement between the purchaser and the supplier.
7 Information and marking
7.1 Information
Both parties shall exchange any necessary information in order to assure that the unit is
suitable for the intended duty. This information is given in general in Clause 5, and with regard
to particular features or alternative choices for the contents, in Clause 6. A summary of this
information is provided in Annex A.
7.2 Marking
Each unit shall be indelibly marked.
The following indications shall be placed on the unit itself or on one or more rating plates
attached to the unit:
 IEC 2015
a) name of the manufacturer or trademark;
b) the reference to this part of IEC 61992, corresponding to any other standard with which the
manufacturer declares compliance;
c) class and category (see 5.4);
d) serial number and designation;
e) year of manufacture;
;
f) rated voltage(s) U
Ne
g) rated auxiliary and control supply voltages;
h) rated service/thermal current I , I or I ;
Ne th the
i) rated breaking current, if applicable;
j) rated making current, if applicable;
k) rated short-time withstand current, I ;
Ncw
l) weight of the complete unit and of each separately removable part;
m) input and output terminals, unless they can be connected either way;
n) earth terminal, if applicable, by the symbol;
o) compliance to service requirements differing from those indicated as normal (see Clause 4
of IEC 61992-1) (on a separate label if convenient).
All necessary labelling shall also be provided as necessary for the purposes of safety,
identification, instruction and information. Lifting attachments shall be marked.
The serial number and designation shall be visible after installation of the unit. The other
markings shall be visible at least before installation.
8 Tests
8.1 General
General requirements concerning tests are shown in Clause 7 of IEC 61992-1.
Unless otherwise indicated, the tests shall be performed at the rated service values: current,
voltage, frequency (if applicable), air pressure (if applicable). This applies to all complete units
(main, control and auxiliary) and in accordance with the values indicated in Clause 5.
The test variables shall be within the tolerances indicated in Table 6 of IEC 61992-1.
8.2 Applicable tests and test sequence
The applicable tests are summarised in Table 2. The tests shall be performed in the order
given in Table 2 for each sequence group.

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 IEC 2015
Table 2 – List of applicable tests and sequence
Kind
Reference to
Group Test description
subclause
D, ES SD
General operating characteristics
Verification of conformity to the manufacturing drawings T – R T – R 8.3.1.1
Measurement of the resistance T – R T – R 8.3.1.2
Mechanical operation T – R T – R 8.3.2
Dielectric withstand  8.3.3
Impulse withstand voltage T – I T – I 8.3.3.2
Power-frequency voltage T – R T – R 8.3.3.3
Temperature-rise T T 8.3.4
Electrical endurance - T 8.3.5
Mechanical endurance T T 8.3.6
Overcurrent behaviour
a
2 Verification of the rated making and breaking capacities T T 8.3.7
Verification of the behaviour under short-time withstand current T T 8.3.8
Verification of the sturdiness of the manual control device and T T 8.3.9
reliability of the position indicator
4 Search for critical currents and low current test duty - T 8.3.10
a
If declared by the manufacturer for disconnectors.
NOTE T = Type test
R = Routine test
I = Investigation test
ES = Earthing switch
D = Disconnector
SD = Switch-disconnector
8.3 Performance of tests
8.3.1 Verification of the conformity to the manufacturing drawings and to the
characteristics of the unit
8.3.1.1 Verification of the conformity to the manufacturing drawings
The units to be tested shall comply in all essential details with the drawings of the type which
they represent.
8.3.1.2 Measurement of the resistance of the main circuit
Resistance measurements of the main circuit shall be made with the unit at ambient
temperature.
The tests shall be carried out according the requirements of 6.4.1 of IEC 60694.
NOTE This measurement is also required both before and after each test in 8.3.5, 8.3.7 and 8.3.8.
8.3.1.3 Measurement of the resistance of the coils (if any) at ambient temperature
Measurements shall be taken at ambient temperature and shall be corrected to a measurement
for a temperature of 35 °C.
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8.3.2 Mechanical operation test
This test is carried out at the laboratory ambient temperature in accordance with 7.3.1 of
IEC 61992-1.
NOTE This test is intended to prove the correct operation of the unit and that the unit complies with the operating
conditions stipulated.
Electrically powered control devices, if any, shall be checked for correct operation within the
maximum and minimum voltage limits specified.
The opening and closing times (when indicated) shall be verified.
This test is repeated, when required, as a type test for abnormal operating conditions
(see 7.3.1 of IEC 61992-1).
8.3.3 Dielectric tests
8.3.3.1 General
Dielectric tests shall be in accordance with 7.5 of IEC 61992-1, with the following qualifications.
Dielectric tests shall be carried out on a new unit, mounted as in service conditions. Where the
supporting structure of the unit is made of insulating material, suitable metallic pieces shall be
inserted on the fixing point simulating the installation conditions.
8.3.3.2 Impulse withstand voltage test
This test is a type test for units having U greater than 2 500 V and is an investigation test in
Nm
all other cases.
The tests shall be performed in accordance with the requirements of 7.5.1 of IEC 61992-1 both
in the open and closed positions.
8.3.3.3 Power-frequency voltage withstand test
8.3.3.3.1 General
Power-frequency voltage withstand tests are routine tests.
8.3.3.3.2 Main circuit
This test shall be carried out in accordance with 7.5.2 of IEC 61992-1 both in the open and
closed positions.
8.3.3.3.3 Control and auxiliary circuits
The test voltage is applied for 60 s in the following conditions:
a) between all the interconnected auxiliary and control circuits, which are not normally
connected to the main circuit, and the unit metallic frame;
b) if an auxiliary circuit is intended to be physically segregated or fully isolated from the
remaining auxiliary circuits, then the test is between this circuit and the remainder;
c) all equipment having previously satisfactorily passed this test may be disconnected.
NOTE Semi-conductors should be short-circuited during the test.
8.3.3.4 Test values
RMS test values are specified in Table 1 of IEC 61992-1.

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The level required for the test between the contacts may be selected at the level just below that
for the main circuits and earth. Similarly, different voltage levels may be chosen for auxiliary
and control circuits to earth and between themselves.
Repeated tests are carried out at 75 % of the voltage value stipulated for a new unit submitted
for the first time to dielectric tests.
8.3.4 Temperature-rise test
General provisions concerning the temperature-rise test are given in 7.4 of IEC 61992-1.
Temperature rises specified in Clause 6 of IEC 61992-1 shall not be exceeded.
8.3.5 Electrical endurance test
This test is a type test for switch-disconnectors only and is carried out in laboratory conditions.
The test procedure shall be in accordance with 7.3.2 of IEC 61992
...