SIST EN 60947-6-1:2006

Low-voltage switchgear and controlgear -- Part 6-1: Multiple function equipment - Transfer switching equipment

This part of EN 60947applies to transfer switching equipment (TSE) to be used in power systems with interruption of the supply to the load during transfer, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.

Niederspannungsschaltgeräte -- Teil 6-1: Mehrfunktionsschaltgeräte - Netzumschalter

Appareillage à basse tension -- Partie 6-1: Matériels à fonctions multiples - Matériels de connexion de transfert

La présente partie de la EN 60947 est applicable aux matériels de connexion de transfert (TSE) destinés à être utilisés dans des systèmes de puissance, avec interruption de l'alimentation de la charge pendant le transfert, dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu.

Nizkonapetostne stikalne naprave – 6-1. del: Večfunkcijska oprema – Oprema za samodejno predajanje stikanja (IEC 60947-6-1:2005)

Ta del standarda IEC 60947 velja za opremo za samodejno predajanje stikanja (TSE), ki je namenjena uporabi v napajalnih sistemih s prekinitvijo napajanja zaradi obremenitve med prenosom, katerih nazivna napetost ne presega 1000 V izmenične napetosti ali 1500 V enosmerne napetosti. Zajema: - ročno upravljano opremo za samodejno predajanje stikanja (MTSE); - daljinsko upravljano opremo za samodejno predajanje stikanja (RTSE); - avtomatsko opremo za samodejno predajanje stikanja (ATSE). Zajema samodejno opremo za predajanje stikanja z ohišjem ali brez. Naprave, ki so potrebne za krmiljenje (npr. krmilna stikala, itd.) in zaščito (npr. odklopniki, itd.) opreme za samodejno predajanje stikanja zajemajo ustrezni standardi IEC. Namen tega dela standarda IEC 60947 je, da navede: 1) Značilnosti opreme: a) določene vrste opreme; b) opreme, katere glavni del so naprave, ki jih zajemajo drugi standardi za proizvode IEC 60947. 2) Pogoje opreme glede na: a) dejavnost, za katero je oprema namenjena; b) delovanje in vedenje v primeru navedenih izrednih razmer, na primer kratkega stika; c) dielektrične lastnosti. 3) Preskuse, katerih cilj je potrditi, da oprema izpolnjuje te pogoje, in metode izvajanja teh preskusov. 4) Podatke, ki morajo biti navedeni na opremi in ki jih mora zagotoviti proizvajalec.

General Information

• Status: Published
• Publication Date: 31-Dec-2005
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2006
• Due Date: 01-Jan-2006
• Completion Date: 01-Jan-2006
• Directive: 2004/108/EC - Directive 2004/108/EC of the European Parliament and of the Council of 15 December 2004 on the approximation of the laws of the Member States relating to electromagnetic compatibility and repealing Directive 89/336/EEC
• Directive: 2004/108/EU - DIRECTIVE 2004/108/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 December 2004 on the approximation of the laws of the Member States relating to electromagnetic compatibility and repealing Directive 89/336/EEC
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive: 73/23/EEC - Electrical equipment designed for use within certain voltage limits
• Directive: 89/336/EEC - Electromagnetic compatibility (EMC)
• Mandate: M/404 - Standardisation Mandate to CEN, CENELEC and ETSI for harmonized standard according to the Electro Magnetic Compatibility (EMC) Directive 2004/108/EC
• Ref Project: EN 60947-6-1:2005 - Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment

Relations

• Replaces: SIST EN 60947-6-1:1995/A2:1999 - Low-voltage switchgear and controlgear -- Part 6-1: Multiple function equipment - Automatic transfer switching equipment
• Effective Date: 07-Jun-2022
• Replaces: SIST EN 60947-6-1:1995 - Low-voltage switchgear and controlgear -- Part 6-1: Multiple function equipment - Automatic transfer switching equipment
• Effective Date: 01-Jan-2006
• Replaces: SIST EN 60947-6-1:1995/A11:1998 - Low-voltage switchgear and controlgear -- Part 6-1: Multiple function equipment - Automatic transfer switching equipment
• Effective Date: 01-Jan-2006
• Amended By: SIST EN 60947-6-1:2006/A1:2014 - Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI SIST EN 60947-6-1:2006

STANDARD
januar 2006
1L]NRQDSHWRVWQHVWLNDOQHQDSUDYH±GHO9HþIXQNFLMVNDRSUHPD±2SUHPD
za samodejno predajanje stikanja (IEC 60947-6-1:2005)
(istoveten EN 60947-6-1:2005)
Low-voltage switchgear and controlgear – Part 6-1: Multiple function equipment –
Transfer switching equipment (IEC 60947-6-1:2005)
ICS 5HIHUHQþQDãWHYLOND
29.130.20
! "#$%!&!%’()*#+’
EUROPEAN STANDARD EN 60947-6-1
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2005

ICS 29.130.20 Supersedes EN 60947-6-1:1991 + A1:1994 + A2:1997

English version
Low-voltage switchgear and controlgear
Part 6-1: Multiple function equipment –
Transfer switching equipment
(IEC 60947-6-1:2005)
Appareillage à basse tension Niederspannungsschaltgeräte
Partie 6-1: Matériels à fonctions multiples - Teil 6-1: Mehrfunktionsschaltgeräte -
Matériels de connexion de transfert Netzumschalter
(CEI 60947-6-1:2005) (IEC 60947-6-1:2005)

This European Standard was approved by CENELEC on 2005-10-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, 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

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60947-6-1:2005 E
Foreword
The text of document 17B/1418/FDIS, future edition 2 of IEC 60947-6-1, prepared by SC 17B, Low-
voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 60947-6-1 on 2005-10-01.
This European Standard supersedes EN 60947-6-1:1991 + A1:1994 + A2:1997.
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) 2006-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-10-01
This part of EN 60947 shall be used in conjunction with EN 60947-1:2004 (IEC 60947-1:2004),
General rules.
The provisions of the general rules dealt with in IEC 60947-1 are applicable to this part of EN 60947,
where specifically called for. Clauses and subclauses, tables, figures and annexes of the general rules
thus applicable are identified by reference to IEC 60947-1 (e.g. 1.2.3 of IEC 60947-1, Table 4 of
IEC 60947-1 or Annex A of IEC 60947-1, etc.).
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 89/336/EEC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60947-6-1:2005 was approved by CENELEC as a
European Standard without any modification.
__________
- 3 - EN 60947-6-1:2005
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60695-11-10 1999 Fire hazard testing EN 60695-11-10 1999
Part 11-10: Test flames - 50 W horizontal
and vertical flame test methods
A1 2003 A1 2003
IEC 60947-1 2004 Low-voltage switchgear and controlgear EN 60947-1 2004
Part 1: General rules + corr. November 2004

IEC 60947-2 2003 Part 2: Circuit-breakers EN 60947-2 2003

IEC 60947-3 1999 Part 3: Switches, disconnectors, switch- EN 60947-3 1999
disconnectors and fuse-combination units
A1 2001 A1 2001
IEC 60947-4-1 2000 Part 4-1: Contactors and motor-starters - EN 60947-4-1 2001
Electromechanical contactors and motor-
starters
A1 2002 A1 2002
IEC 60947-4-2 1999 Part 4-2: Contactors and motor-starters - EN 60947-4-2 2000
AC semiconductor motor controllers and
starters
A1 2001 A1 2002
IEC 60947-4-3 1999 Part 4-3: Contactors and motor-starters - EN 60947-4-3 2000
AC semiconductor controllers and
contactors for non-motor loads

IEC 60947-6-2 2002 Part 6-2: Multiple function equipment - EN 60947-6-2 2003
Control and protective switching devices
(or equipment) (CPS)
IEC 61000-4-2 1995 Electromagnetic compatibility (EMC) EN 61000-4-2 1995
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
A1 1998 A1 1998
A2 2000 A2 2001
IEC 61000-4-3 2002 Part 4-3: Testing and measurement EN 61000-4-3 2002
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
A1 2002 A1 2002
Publication Year Title EN/HD Year
IEC 61000-4-4 1995 Part 4-4: Testing and measurement EN 61000-4-4 1995
techniques - Electrical fast transient/burst
immunity test
A1 2000 A1 2001
A2 2001 A2 2001
IEC 61000-4-5 1995 Part 4-5: Testing and measurement EN 61000-4-5 1995
techniques - Surge immunity test
A1 2000 A1 2001
IEC 61000-4-6 2003 Part 4-6: Testing and measurement - -
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields
A1 2004 - -
CISPR 11 2003 Industrial scientific and medical (ISM) - -
radio-frequency equipment -
Electromagnetic disturbance
characteristics - Limits and methods of
measurement
A1 2004 - -
- 5 - EN 60947-6-1:2005
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers all
relevant essential requirements as given in Article 4 of the EC Directive 89/336/EEC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling
within the scope of this standard.
___________
NORME CEI
INTERNATIONALE
IEC
60947-6-1
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2005-08
Appareillage à basse tension–
Partie 6-1:
Matériels à fonctions multiples –
Matériels de connexion de transfert

Low-voltage switchgear and controlgear –
Part 6-1:
Multiple function equipment –
Transfer switching equipment
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60947-6-1  IEC:2005 – 3 –
CONTENTS
FOREWORD.7

1 Scope and object.13
2 Normative references .15
3 Terms and definitions, symbols and abbreviations .17
3.1 Switching devices.17
3.2 Operation of TSE.19
3.3 Main contact positions.21
3.4 Symbols and abbreviations.21
4 Classification.23
5 Characteristics .23
5.1 Summary of characteristics .23
5.2 Type of equipment.23
5.3 Rated and limiting values for the main circuit.23
5.4 Utilization category.29
5.5 Control circuits .29
5.6 Auxiliary circuits .31
6 Product information .31
6.1 Nature of information.31
6.2 Marking .33
6.3 Instructions for installation, operation and maintenance .33
7 Normal service, mounting and transport conditions.33
8 Constructional and performance requirements.33
8.1 Constructional requirements.33
8.2 Performance requirements .33
8.3 Electromagnetic compatibility (EMC) .43
9 Tests .45
9.1 Kinds of tests .45
9.2 Compliance with constructional requirements .45
9.3 Performance.47
9.4 Routine tests .71
9.5 EMC tests .71

Annex A (normative) – Assignment of utilization categories based on the results of tests .81
Annex B (informative) – Items subject to agreement between manufacturer and user .85

Figure 1 – Test circuit for connection to normal and alternative supplies.77
Figure 2 – Test circuit for the verification of making and breaking capacities on three poles .79
Figure 3 – Test circuit for the verification of making and breaking capacities on two poles .79

60947-6-1  IEC:2005 – 5 –
Table 1 – Utilization categories .29
Table 2 – Verification of making and breaking capacity – Conditions for making and
breaking corresponding to the utilization categories.37
Table 3 – Verification of operational performance – Conditions for making and breaking
corresponding to the utilization categories .39
Table 4 – Value of the test current for the verification of the ability to operate under
short-circuit conditions.41
Table 5 – Acceptance criteria.45
Table 6 – List of type tests (overall scheme of test sequences).49
Table 7 – List of type tests (referred to by their subclause numbers) to which a given
derived TSE shall be submitted.51
Table 8 – Number and duration of operating cycles for the making and breaking
capacity test .59
Table 9 – Number and duration of operating cycles for the electrical and mechanical
operational performance tests for operation A utilization categories.63
Table 10 – Number and duration of operating cycles for the electrical and mechanical
operational performance tests for operation B utilization categories.63
Table A.1 – Equivalence between utilization categories used in some IEC 60947
product standards .83

60947-6-1  IEC:2005 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 6-1: Multiple function equipment –
Transfer switching equipment
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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 60947-6-1 has been prepared by subcommittee 17B: Low-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
This second edition cancels and replaces the first edition published in 1989, amendment 1
(1994), and amendment 2 (1997). This edition incorporates Amendment 3 which was not
published separately.
The text of this standard is based on first edition, amendment 1, amendment 2 and the
following documents:
FDIS Report on voting
17B/1418/FDIS 17B/1424/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.

60947-6-1  IEC:2005 – 9 –
This part of IEC 60947shall be used in conjunction with IEC 60947-1: General rules.
The provisions of the general rules dealt with in IEC 60947-1 are applicable to this part of
IEC 60947, where specifically called for. Clauses and subclauses, tables, figures and
annexes of the general rules thus applicable are identified by reference to IEC 60947-1 (e.g.
1.2.3 of IEC 60947-1, Table 4 of IEC 60947-1 or Annex A of IEC 60947-1, etc.).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 60947 consists of the following parts, under the general title Low-voltage switchgear and
controlgear:
Part 1: General rules
Part 2: Circuit-breakers
Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
Part 4-1: Contactors and motor-starters – Electromechanical contactors and motor-starters
Part 4-2: Contactors and motor-starters – AC semiconductor motor controllers and starters
Part 4-3: Contactors and motor-starters – AC semiconductor controllers and contactors for
non-motor loads
Part 5-1: Control circuit devices and switching elements – Electromechanical control circuit
devices
Part 5-2: Control circuit devices and switching elements – Proximity switches
Part 5-3: Control circuit devices and switching elements – Requirements for proximity
devices with defined behaviour under fault conditions (PDF)
Part 5-4: Control circuit devices and switching elements – Method of assessing the
performance of low-energy contacts – Special tests
Part 5-5: Control circuit devices and switching elements – Electrical emergency stop device
with mechanical latching function
Part 5-6: Control circuit devices and switching elements – DC interface for proximity
sensors and switching amplifiers (NAMUR)
Part 5-7: Control circuit devices and switching elements – Requirements for proximity
devices with analogue output
Part 5-8: Control circuit devices and switching elements – Three-position enabling switches
Part 5-9: Control circuit devices and switching elements – Flow rate switches
Part 6-1: Multiple function equipment – Automatic transfer switching equipment
Part 6-2: Multiple function equipment – Control and protective switching devices (or
equipment) (CPS)
—————————
Under consideration.
60947-6-1  IEC:2005 – 11 –
Part 7-1: Ancillary equipment – Terminal blocks for copper conductors
Part 7-2: Ancillary equipment – Protective conductor terminal blocks for copper conductors
Part 7-3: Ancillary equipment – Safety requirements for fuse terminal blocks
Part 7-3: Ancillary equipment – Safety requirements for fuse terminal blocks
Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines

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.
60947-6-1  IEC:2005 – 13 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 6-1: Multiple function equipment –
Transfer switching equipment
1 Scope and object
This part of IEC 60947applies to transfer switching equipment (TSE) to be used in power
systems with interruption of the supply to the load during transfer, the rated voltage of which
does not exceed 1 000 V a.c. or 1 500 V d.c.
It covers:
– manually operated transfer switching equipment (MTSE);
– remote operated transfer switching equipment (RTSE);
– automatic transfer switching equipment (ATSE).
It covers TSE provided with or without an enclosure.
Devices necessary for the control (e.g. control switches, etc.) and the protection (e.g. circuit-
breakers, etc.) of a TSE are covered by the relevant IEC standards.
NOTE TSE used only for emergency lighting may be subject to specific rules and/or legal requirements and are
not, therefore, covered by this standard.
The object of this part of IEC 60947 is to state:
1) The characteristics of the equipment:
a) specific equipment;
b) equipment the main part of which being devices covered by other IEC 60947 product
standards.
2) The conditions of the equipment with respect to:
a) operation for which the equipment is intended;
b) operation and behaviour in case of specified abnormal conditions, for example, short-
circuit;
c) dielectric properties.
3) The tests intended to confirm that these conditions have been met and the methods for
performing these tests.
4) The data to be marked on the equipment and provided by the manufacturer.

60947-6-1  IEC:2005 – 15 –
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 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
Amendment 1 (2003)
IEC 60947-1:2004, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-2:2003, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-3:1999, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
Amendment 1 (2001)
IEC 60947-4-1:2000, Low-voltage switchgear and controlgear – Part 4-1: Contactors and
motor-starters – Electromechanical contactors and motor-starters
Amendment 1 (2002)
IEC 60947-4-2:1999, Low-voltage switchgear and controlgear – Part 4-2: Contactors and
motor-starters – AC semiconductor motor controllers and starters
Amendment 1 (2001)
IEC 60947-4-3:1999, Low-voltage switchgear and controlgear – Part 4-3: Contactors and
motor-starters – AC semiconductor controllers and contactors for non-motor loads
IEC 60947-6-2:2002, Low-voltage switchgear and controlgear – Part 6-2: Multiple function
equipment – Control and protective switching devices (or equipment) (CPS)
IEC 61000-4-2:1995, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
Amendment 1 (1998)
Amendment 2 (2000)
IEC 61000-4-3:2002, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
Amendment 1 (2002)
IEC 61000-4-4:1995, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
Amendment 1 (2000)
Amendment 2 (2001)
IEC 61000-4-5:1995, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
Amendment 1 (2000)
IEC 61000-4-6:2003, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
Amendment 1 (2004)
60947-6-1  IEC:2005 – 17 –
CISPR 11:2003, Industrial, scientific and medical (ISM) radio-frequency equipment –
Electromagnetic disturbance characteristics – Limits and methods of measurement
Amendment 1 (2004)
3 Terms and definitions, symbols and abbreviations
For the purpose of this part of IEC 60947 the relevant terms and definitions given in Clause 2
of IEC 60947-1 and the following additional definitions shall apply:
Reference
A
Alternative position . 3.3.2
Automatic transfer switching equipment (ATSE). 3.1.4

C
Contact transfer time . 3.2.5

D
Derived transfer switching equipment (derived TSE) . 3.1.5

F
Frequency supply deviation . 3.2.4

M
Manually operated transfer switching equipment (MTSE). 3.1.2
Monitored supply deviation of ATSE . 3.2.2

N
Normal position. 3.3.1

O
Off position . 3.3.3
Off-time. 3.2.9
Operating sequence of ATSE. 3.2.1
Operating transfer time . 3.2.6

R
Remotely operated transfer switching equipment (RTSE). 3.1.3
Return transfer time. 3.2.8

T
Total operating time. 3.2.7
Transfer switching equipment (TSE). 3.1.1

V
Voltage supply deviation . 3.2.3

3.1 Switching devices
3.1.1
transfer switching equipment
TSE
equipment containing one or more switching devices for disconnecting load circuits from one
supply and connecting to another supply
3.1.2
manually operated transfer switching equipment
MTSE
transfer switching equipment operated manually

60947-6-1  IEC:2005 – 19 –
3.1.3
remotely operated transfer switching equipment
RTSE
transfer switching equipment operated remotely
NOTE RTSE may have an optional feature for local operation.
3.1.4
automatic transfer switching equipment
ATSE
self-acting transfer switching equipment
NOTE 1 ATSE normally includes all necessary devices for monitoring and transferring operations.
NOTE 2 ATSE may have an optional feature for manual operation.
3.1.5
derived transfer switching equipment
derived TSE
TSE in which the main part are device(s) fulfilling requirements of other IEC 60947 product
standards
NOTE 1 For convenience, derived TSE may be called derived ATSE, derived MTSE or derived RTSE.
NOTE 2 For convenience, parts other than main parts (e.g. those intended to control the TSE: control switches,
mechanical interlocking devices, …) are called other parts.
3.2 Operation of TSE
3.2.1
operating sequence of ATSE
automatic transfer of a load from the normal supply to an alternative supply in the event of a
monitored supply deviation with an automatic return of the load to the normal supply when
restored
NOTE 1 The transfer may be with or without a predetermined time delay and may include an off position.
NOTE 2 In the case of both the normal and the alternative supplies being present, the ATSE assumes the normal
supply position.
3.2.2
monitored supply deviation of ATSE
variation in the power supply characteristics which signals the ATSE to operate when a
deviation from the specified limits occurs
EXAMPLE Abnormal changes in voltage or frequency of the supply are supply deviations.
3.2.3
voltage supply deviation
change or loss of voltage of the normal power supply
3.2.4
frequency supply deviation
change in frequency from the normal operating frequency of the normal supply
3.2.5
contact transfer time
time measured from the parting of one set of main contacts from one power supply to the
closing of a second set of main contacts on an alternative power supply

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3.2.6
operating transfer time
time measured from the instant of the monitored supply deviation to the closing of main
contacts on an available alternative supply source, exclusive of any purposely introduced time
delay
3.2.7
total operating time
sum of operating transfer time and any purposely introduced time delay
3.2.8
return transfer time
time from the instant when the normal supply is fully restored to the instant when the set of
main contacts is closed on the normal supply, plus any purposely introduced time delay
3.2.9
off-time
time measured during transfer from the instant of final arc extinction, under the conditions
producing the longest arcing time, in all poles to the closing of main contacts on another
supply
NOTE Any purposely introduced time delay would be included within the off-time.
3.3 Main contact positions
3.3.1
normal position
contact position of the equipment when there is no deviation of the normal supply
3.3.2
alternative position
contact position of the equipment when the load circuit is switched on the alternative
(emergency) supply in the event of a monitored supply deviation of the normal supply
3.3.3
off position
contact position of the equipment when the load circuit is not switched on any supply
NOTE This position results from either automatic tripping caused by a fault in the load circuit or intentional
interruption of the automatic transfer function.
3.4 Symbols and abbreviations
EMC Electromagnetic compatibility
I Rated short-circuit making capacity (5.3.6.2)
cm
I Rated short-circuit breaking capacity (5.3.6.3)
cn
I Rated short-time withstand current (5.3.6.1)
cw
I Rated operational current (5.3.2)
e
I Rated uninterrupted current (5.3.2)
u
SCPD Short-circuit protective device
U Rated operational voltage (5.3.1.1)
e
U Rated insulation voltage (5.3.1.2)
i
U Rated impulse withstand voltage (5.3.1.3)
imp
U Power frequency or d.c. recovery voltage (Table 2)
r
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4 Classification
Transfer switching equipment is classified according to:
a) their short-circuit capability:
− class PC: TSE that is capable of making and withstanding, but is not intended for
breaking short-circuit currents;
NOTE Contactors can be used in class PC if they fulfil the test requirements of class PC.
− class CB: TSE provided with over-current releases and the main contacts of which are
capable of making and are intended for breaking short-circuit currents;
− class CC: TSE that is capable of making and withstanding, but is not intended for
breaking short-circuit currents. TSE based on devices fulfilling the requirements of
IEC 60947-4-1;
b) the method of controlling the transfer:
− manually operated switching equipment (MTSE);
− remote operated switching equipment (RTSE);
− automatic transfer switching equipment (ATSE).
5 Characteristics
5.1 Summary of characteristics
Wherever practicable the characteristics of the TSE shall be stated as follows:
– Type of equipment (5.2).
– Rated and limiting values for the main circuit (5.3).
– Utilization category (5.4).
– Control circuits (5.5).
– Auxiliary circuits (5.6).
Where the TSE uses IEC 60947 products, the relevant characteristics from those standards
may also be additionally used.
5.2 Type of equipment
The following shall be stated:
– class and transfer control method of the equipment (see Clause 4);
– number of poles;
– kind of current;
– operating sequence.
5.3 Rated and limiting values for the main circuit
Subclause 4.3 of IEC 60947-1 applies. However, minimum values for 5.3.6.1, 5.3.6.3 and
5.3.6.4 are given in Table 4.
60947-6-1  IEC:2005 – 25 –
5.3.1 Rated voltages
5.3.1.1 Rated operational voltage (U )
e
Subclause 4.3.1.1 of IEC 60947-1 applies.
5.3.1.2 Rated insulation voltage (U )
i
Subclause 4.3.1.2 of IEC 60947-1 applies.
5.3.1.3 Rated impulse withstand voltage (U )
imp
Subclause 4.3.1.3 of IEC 60947-1 applies.
5.3.2 Rated operational current (I )
e
The rated operational current of TSE is the rated uninterrupted current (I ). See 4.3.2.4 of
u
IEC 60947-1.
5.3.3 Rated frequency
Subclause 4.3.3 of IEC 60947-1 applies.
5.3.4 Uninterrupted duty
Subclause 4.3.4.2 of IEC 60947-1 applies.
5.3.5 Rated making and breaking capacities
The rated making and breaking capacities are the values of current, stated by the
manufacturer, which the transfer equipment can satisfactorily make and break under specified
conditions. Unless stated otherwise, they are given in terms of a steady state current value.
During the making operation, the peak value of the current on contact closing may be higher
than the peak value of the steady state current depending on the characteristics of the test
circuit (load) and the instant of closing on the voltage wave.
The rated making and breaking capacities are stated with reference to the rated operational
voltage, the rated operational current and the utilization category according to Table 2.
For a.c., the rated making and breaking capacities are expressed by the r.m.s. value of the
a.c. component of the current.
5.3.6 Short-circuit characteristics
5.3.6.1 Rated short-time withstand current (I )
cw
The rated short-time withstand current is the value of short-time withstand current stated by
the manufacturer which the equipment can carry under the test conditions specified in 9.3.4.3.
For a.c., the value of the current is the r.m.s. value of the a.c. component and the highest
peak value in any one phase shall be not less than n times this r.m.s. value, the ratio n being
given in Table 16 of IEC 60947-1.

60947-6-1  IEC:2005 – 27 –
The minimum value of the short-time withstand current is given in column 2 of Table 4.
NOTE Additional lower values of short-time withstand current for longer durations may be stated by the
manufacturer.
The minimum durations are:
– 3 half-cycles of the rated frequency or 0,025 s for d.c. for rated operational currents up to
and including 400 A;
– 3 cycles of the rated frequency or 0,05 s for d.c. for rated operational currents higher than
400 A.
5.3.6.2 Rated short-circuit making capacity (I )
cm
The rated short-circuit making capacity is the value of short-circuit making capacity assigned
by the manufacturer for the rated operational voltage at rated frequency and at a specified
power-factor (or time-constant). It is expressed as the maximum prospective peak current.
For class CB TSE and for a.c., the rated short-circuit making capacity shall be not less than
highest value of short-circuit breaking capacity, multiplied by the ratio n of Table 16 of
IEC 60947-1. The manufacturer may assign a higher value of short-circuit making capacity.
For d.c., the rated short-circuit making capacity shall be not less than its rated short-circuit
breaking capacity, on the assumption that the steady-state short-circuit current is constant.
A rated short-circuit making capacity implies that the TSE shall be able to make the current
corresponding to that rated capacity at an applied voltage up to and including that
corresponding to 105 % of the rated operational voltage.
5.3.6.3 Rated short-circuit breaking capacity (I )
cn
The rated short-circuit breaking capacity is the value of short-circuit breaking capacity
assigned by the manufacturer for the rated operational voltage, at rated frequency and at a
specified power-factor (or time-constant).
It is expressed as the value of the prospective breaking current (r.m.s. value of the a.c.
component in the case of a.c.).
The minimum value of the rated short-circuit breaking capacity is given in column 2 of
Table 4. The manufacturer may assign a higher value of breaking capacity.
A rated short-circuit breaking capacity implies that a Class CB TSE shall be able to break any
current up to the rated capacity.
5.3.6.4 Rated conditional short-circuit current
The rated conditional short-circuit current is the value of prospective current, stated by the
manufacturer, which the TSE, protected by a specified short-circuit protective device (SCPD),
can satisfactorily withstand for the operating time of this device under the test conditions
specified in 9.3.4.4.
The minimum value of the prospective current is given in column 2 of Table 4.

60947-6-1  IEC:2005 – 29 –
Details of the specified short-circuit protective device shall be indicated by the manufacturer.
They shall include the type, rating, characteristics and, for current limiting devices, the
maximum peak current and the I t corresponding to the value of the prospective current.
NOTE 1 For a.c., the rated conditional short-circuit current is expressed by the r.m.s. value of the a.c. component.
NOTE 2 The short-circuit protective device may either form an integral part of the equipment or be a separate unit.
5.4 Utilization category
TSE may be assigned one or more of the standard utilization categories given in Table 1 at
one or more rated utilization voltages.
The designation of utilization categories is completed by the suffix A or B, according to the
number of operations (see Tables 8, 9 and 10) required by the application.
TSE assigned any utilization category shall comply with the rated making and breaking
capacity (Table 2) and the electrical and mechanical operational performance requirements
(Table 3) corresponding to the assigned utilization category.
Table 1 – Utilization categories
Nature Utilization category Typical applications
of current
Operation A Operation B
AC-31A AC-31B Non-inductive or slightly inductive loads
AC-32A AC-32B Switching of mixed resistive and inductive loads,
including moderate overloads
Alternating
AC-33A AC-33B Motor loads or mixed loads including motors, resistive
current
loads and up to 30 % incandescent lamp loads
AC-35A AC-35B Electric discharge lamp loads
AC-36A AC-36B Incandescent lamp loads
DC-31A DC-31B Resistive loads
Direct current DC-33A DC-33B Motor loads or mixed loads including motors
DC-36A DC-36B Incandescent lamp load

For TSE for which the main parts are covered by other IEC 60947 product standards,
utilization categories defined in these product standards may be used as equivalent as those
defined in Table 1, see Annex A.
5.5 Control circuits
Subclause 4.5 of IEC 60947-1 applies with the following additions for monitored supply (see
3.2.2).
5.5.1 Electro-mechanical devices controlling the main circuit
The minimum and maximum values of voltage or voltage and frequency operating limits shall
be stated by the manufacturer. These limits shall correspond to the limits for the transfer
control devices.
60947-6-1  IEC:2005 – 31 –
5.5.2 Transfer control devices
The manufacturer shall state the following:
a) the voltage and frequency deviations at which transfer should occur;
b) the contact transfer time, the operating transfer time, the return transfer time range and
the off time range (if any).
5.6 Auxiliary circuits
Subclause 4.6 of IEC 60947-1 applies.
6 Product information
6.1 Nature of information
The following information shall be given by the manufacturer:
Identification:
a) the manufacturer's name or trade mark;
b) type designation or serial number;
c) number of this part of IEC 60947 if the manufacturer claims compliance;
Characteristics:
d) class of equipment: PC, CB or CC;
e) rated operational voltage(s);
f) utilization category and rated operational current at the rated operational voltage;
g) either value of the rated frequency, for example: 50 Hz or the indication "d.c." (or the
symbol );
h) rated short-circuit making capacity for class PC/CC, and
i) rated short-time withstand current, where applicable;
j) rated conditional short-circuit current and associated SCPD (see 5.3.6.4), where
applicable;
k) rated short-circuit making and breaking capacities for Class CB;
l) number of main contact positions;
m) monitored supply deviation and operating limits;
n) operating sequence and time delays, if any, and the position of time delays in the
operating sequence;
o) rated impulse withstand voltage;
p) environment A or B (see 7.3.1 of IEC 60947-1);
q) special requirements, if applicable, for example shielded or twisted conductors;
NOTE Unshielded or untwisted conductors are considered as normal installation conditions.
r) off-time for derived TSE (see 3.2.9).

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6.2 Marking
Each TSE shall be marked in a durable manner with the following data. The markings shall be
o
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