IEC 60947-3:2008/AMD1:2012

IEC 60947-3


®


Edition 3.0 2012-02



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1

Low-voltage switchgear and controlgear –
Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination
units

Appareillage à basse tension –
Partie 3: Interrupteurs, sectionneurs, interrupteurs-sectionneurs et combinés-
fusibles

IEC 60947-3:2008/A1:2012

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IEC 60947-3



®



Edition 3.0 2012-02







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE




AMENDMENT 1

AMENDEMENT 1





Low-voltage switchgear and controlgear –

Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination

units




Appareillage à basse tension –

Partie 3: Interrupteurs, sectionneurs, interrupteurs-sectionneurs et combinés-


fusibles














INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX L


ICS 29.120.40; 29.130.20 ISBN 978-2-88912-921-8



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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
– 2 – 60947-3 Amend. 1 © IEC:2012



FOREWORD


This amendment has been prepared by subcommittee 17B: Low-voltage switchgear and

controlgear, of IEC technical committee 17: Switchgear and controlgear.


The text of this amendment is based on the following documents:


FDIS Report on voting

17B/1758/FDIS 17B/1763/RVD



Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this publication 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• withdrawn,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.
The contents of the corrigendum of November 2013 have been included in this copy.
_____________

1.2 Normative references
Replace the existing reference to IEC 60947-1 by the following new reference and footnote:
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
1)
Amendment 1:2010
1) A consolidated edition 3.1 exists, including IEC 60947-1:2007 and its Amendment 1:2010.
2 Terms and definitions

Replace the text of the existing Clause 2 by the following new text:
2.1 General
For the purposes of this document, the terms and definitions given in IEC 60050-441,
IEC 60947-1 and the following apply.

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60947-3 Amend. 1 © IEC:2012 – 3 –


2.2 Alphabetical index of terms

Reference

D


Disconnector . 2.3.1

Disconnector-fuse . 2.3.5

F


Fuse-combination unit . 2.3.2
Fuse-disconnector . 2.3.6

Fuse-switch . 2.3.4

Fuse-switch-disconnector . 2.3.8
S
Semi-independent manual operation . 2.3.10
Single pole operated three pole switch . 2.3.9
Switch-disconnector-fuse . 2.3.7
Switch-fuse . 2.3.3
2.3 Terms and definitions
2.3.1
disconnector
mechanical switching device which, in the open position, complies with the requirements
specified for the isolating function
[IEC 60050-441:1984, 441-14-05, modified]
NOTE 1 This definition differs from IEC 60050-441:1984, 441-14-05 by referring to isolating function instead of
isolating distance.
NOTE 2 A disconnector is capable of opening and closing a circuit when either a negligible current is broken or
made, or when no significant change in the voltage across the terminals of each of the poles of the disconnector
occurs. It is also capable of carrying currents under normal circuit conditions and carrying, for a specified time,
currents under abnormal conditions such as those of short circuit.
2.3.2
fuse-combination unit
combination of a mechanical switching device and one or more fuses in a composite unit,
assembled by the manufacturer or in accordance with his instructions
[IEC 60050-441:1984, 441-14-04]

2.3.3
switch-fuse
switch in which one or more poles have a fuse in series in a composite unit
[IEC 60050-441:1984, 441-14-14]
2.3.3.1
switch-fuse single break
switch-fuse which opens the circuit on one side of the fuse-link only
2.3.3.2
switch-fuse double break
switch-fuse which opens the circuit on both sides of the fuse-link
2.3.4
fuse-switch
switch in which a fuse-link or fuse-carrier with fuse-link forms the moving contact

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– 4 – 60947-3 Amend. 1 © IEC:2012


[IEC 60050-441:1984, 441-14-17]


2.3.4.1

fuse-switch single break

fuse-switch which opens the circuit on one side of the fuse link only


2.3.4.2

fuse-switch double break

fuse-switch which opens the circuit on both sides of the fuse link


2.3.5

disconnector-fuse
disconnector in which one or more poles have a fuse in series in a composite unit
[IEC 60050-441:1984, 441-14-15]
2.3.5.1
disconnector-fuse single break
disconnector-fuse which opens the circuit on one side of the fuse-link only
2.3.5.2
disconnector-fuse double break
disconnector-fuse which opens the circuit on both sides of the fuse-link
2.3.6
fuse-disconnector
disconnector in which a fuse-link or fuse-carrier with fuse-link forms the moving contact
[IEC 60050-441:1984, 441-14-18]
2.3.6.1
fuse-disconnector single break
fuse-disconnector which opens the circuit on one side of the fuse link only
2.3.6.2
fuse-disconnector double break
fuse-disconnector which opens the circuit on both sides of the fuse link
2.3.7
switch-disconnector-fuse
switch-disconnector in which one or more poles have a fuse in series in a composite unit

[IEC 60050-441:1984, 441-14-16]
2.3.7.1
switch-disconnector-fuse single break
switch-disconnector-fuse which opens the circuit on one side of the fuse-link only
2.3.7.2
switch-disconnector-fuse double break
switch-disconnector-fuse which opens the circuit on both sides of the fuse-link
2.3.8
fuse-switch-disconnector
switch-disconnector in which a fuse-link or fuse-carrier with fuse-link forms the moving
contact
[IEC 60050-441:1984, 441-14-19]

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60947-3 Amend. 1 © IEC:2012 – 5 –


2.3.8.1

fuse-switch-disconnector single break

fuse-switch-disconnector which opens the circuit on one side of the fuse link only


2.3.8.2

fuse-switch-disconnector double break

fuse-switch-disconnector which opens the circuit on both sides of the fuse link


2.3.9

single pole operated three pole switch

device consisting of three individually operable single pole switch disconnecting devices

according to this part, rated as a complete unit for use in a three-phase system
NOTE These devices are intended for power distribution systems where switching and/or isolation of an individual
phase may be necessary and they should not be used for the switching of the primary circuit of three-phase
equipment.
2.3.10
semi-independent manual operation
operation solely by means of directly applied manual energy such that the manual force is
increased up to a threshold value beyond which the independent switching operation is
achieved unless deliberately delayed by the operator
2.4 Summary of the equipment types
A summary of equipment definitions and relevant diagrams is given in Table 1.

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– 6 – 60947-3 Amend. 1 © IEC:2012


Table 1 – Summary of equipment definitions

Functions

Making and breaking current Isolating Making, breaking and isolating

Switch Disconnector Switch-disconnector






Fuse-combination units

Switch-fuse Disconnector-fuse Switch-disconnector-fuse

b b
single break single break single break



 a  a a



Switch-fuse Disconnector-fuse
Switch-disconnector-fuse
b
b double break
double break double break





Fuse-switch Fuse-disconnector Fuse-switch-disconnector
b b
single break single break single break





Fuse-switch Fuse-disconnector Fuse-switch-disconnector
b b
double break double break double break


NOTE 1 Equipment shown as single break may be double break.
NOTE 2 Symbols are based on IEC 60617-7.
a
The fuse may be on either side of the contacts of the equipment or in a stationary position between these
contacts.
b
Disconnection between line and load terminals only is verified by test.


3.2 According to the method of operation of manually operated equipment
Replace the existing reference "(see 2.13)" by the following new reference "(see 2.4.12 of
IEC 60947-1)".
Replace the existing reference "(see 2.14)" by the following new reference "(see 2.4.15 of
IEC 60947-1)".
Replace the existing reference "(see 2.15)" by the following new reference "(see 2.3.10)".

4.2 Type of equipment
Replace the existing text of this subclause by the following new text:

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60947-3 Amend. 1 © IEC:2012 – 7 –


The following information shall be stated:


• number of poles;

• kind of current (a.c. or d.c.);


• in the case of a.c., number of phases and rated frequency;

• number of positions of the main contacts (if more than two);

• breaking arrangement for fused devices (single break or double break).





4.3.6.2 Rated short-circuit making capacity (I )
cm
Replace the existing text of this subclause by the following new text:
Subclause 4.3.6.2 of IEC 60947-1 applies with the following addition.
NOTE I is not applicable to fused devices.

cm

Add, after the existing subclause 4.7, the following new subclause 4.8:
4.8 Co-ordination with short circuit protective devices (SCPD)
Subclause 4.8 of IEC 60947-1 applies.

7.1.2 Materials
Replace the existing text of this subclause by the following new text:
(Void)

7.1.4 Clearances and creepage distances
Replace the existing text of this subclause by the following new text:

(Void)

7.1.7.2 Supplementary requirements for equipment with provision for electrical
interlocking with contactors or circuit-breakers
Replace the existing text of this subclause by the following new text:
(Void)

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– 8 – 60947-3 Amend. 1 © IEC:2012


7.1.7.3 Supplementary requirements for equipment provided with means for

padlocking the open position


Replace the existing text of this subclause by the following new text:


(Void)





7.1.12 Degrees of protection of enclosed equipment


Replace the existing text of this subclause by the following new text:
(Void)

7.2.1.1 General
In the second paragraph, replace the existing references "see 2.13 and 2.15" by the following
new references "see 2.4.12 of IEC 60947-1 and 2.3.10".

Add, after the existing subclause 7.2.1.1, the following new subclauses 7.2.1.2, 7.2.1.3 and
7.2.1.4:
7.2.1.2 Limits of operation of power operated equipment
Subclause 7.2.1.2 of IEC 60947-1 applies.
7.2.1.3 Limits of operation of under-voltage relays and releases.
Subclause 7.2.1.3 of IEC 60947-1 applies.
7.2.1.4 Limits of operation of shunt releases
Subclause 7.2.1.4 of IEC 60947-1 applies.
7.3.2 Immunity

Replace the existing text of this subclause, including subclauses 7.3.2.1 and 7.3.2.2, by the
following new text:
Subclause 7.3.2 of IEC 60947-1 applies with the following change and addition.
7.3.2.1 Equipment not incorporating electronic circuits
Subclause 7.3.2.1 of IEC 60947-1 applies.
7.3.2.2 Equipment incorporating electronic circuits
Equipment incorporating electronic circuits (for example fuse-blowing indicator) shall have
satisfactory immunity to electromagnetic disturbances (see 8.4.1.2).
For the appropriate tests to verify the compliance with these requirements, see 8.4 of
IEC 60947-1.

---------------------- Page: 10 ----------------------
60947-3 Amend. 1 © IEC:2012 – 9 –


Specific performance criteria shall be given in the relevant product standard based on the

acceptance criteria given in Table 24 of IEC 60947-1.


Table 6 provides the specific immunity performance criteria to be considered.


Table 6 − Immunity tests


Types of test Test level required Acceptance criteria

(as defined in Table 24

of IEC 60947-1)

8 kV / air discharge
Electrostatic discharge immunity test
or B
IEC 61000-4-2
4 kV / contact discharge
Radiated radio-frequency electromagnetic field
immunity test 10 V/m A
IEC 61000-4-3
2 kV / 5 kHz on power ports
Electrical fast transient/burst immunity test
B
IEC 61000-4-4 1 kV / 5 kHz on signal ports
Surge immunity test 2 kV (common mode)
B
IEC 61000-4-5 1 kV (differential mode)
Conducted disturbances induced by radio-
frequency fields immunity test 10 V A
IEC 61000-4-6
NOTE 1 A simple rectifier is not sensitive to electromagnetic disturbances in normal service conditions and
does not therefore require immunity tests.
NOTE 2 Where an acceptance criteria B is specified there shall be no change of the status of the main contacts
as a result of the disturbance.

7.3.3.1 Equipment not incorporating electronic circuits
Replace the existing text of this subclause by the following new text:
Subclause 7.3.3.1 of IEC 60947-1 applies.

8.2.5.2 Method of test
Replace the existing text of this subclause, including subclauses 8.2.5.2.1 to 8.2.5.2.3, by the
following new text:

(Void)

8.2.5.3 Condition of equipment during and after test
Replace the existing text of this subclause, including subclauses 8.2.5.3.1, 8.2.5.3.2, Table 8
and Figure 1, by the following new text:
(Void)

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– 10 – 60947-3 Amend. 1 © IEC:2012


8.3.2.1 General requirements


In the second paragraph, replace "8.2.5.2" by "8.2.5.2 of IEC 60947-1".





8.3.2.1.2 Requirements for equipment having the same fundamental design


Replace the existing text of item j) by the following new text:


j) design of terminal provided that clearances and creepage distance are not reduced (see

8.2.4 and 8.3.3.2 of this standard and also see 7.1.4 and 8.3.3.1 of IEC 60947-1);

8.3.3.1 Temperature-rise
Replace the existing second paragraph of this subclause by the follo
...