IEC 60947-3:2008/AMD2:2015
(Amendment)Amendment 2 - Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
Amendment 2 - Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
Amendement 2 - Appareillage à basse tension - Partie 3: Interrupteurs, sectionneurs, interrupteurs-sectionneurs et combinés-fusibles
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Standards Content (Sample)
IEC 60947-3 ®
Edition 3.0 2015-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
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 60947-3:2008-08/AMD2:2015-07(en-fr)
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IEC 60947-3 ®
Edition 3.0 2015-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
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
INTERNATIONALE
ICS 29.120.40, 29.130.20 ISBN 978-2-8322-2718-3
– 2 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
FOREWORD
This amendment has been prepared by subcommittee 121A: Low-voltage switchgear and
controlgear, of IEC technical committee 121: Switchgear and controlgear and their assemblies
for low voltage.
The text of this amendment is based on the following documents:
FDIS Report on voting
121A/42/FDIS 121A/46/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 website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
1 General
1.2 Normative references
Replace the existing subclause by the following new subclause:
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 60050-441:1984, International Electrotechnical Vocabulary (IEV) – Chapter 441
Switchgear, controlgear and fuses
IEC 60050-441:1984/AMD1:2000
IEC 60269 (all parts), Low-voltage fuses
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60417-DB:2002 , Graphical symbols for use on equipment
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-1:2007/AMD1:2010
IEC 60947-1:2007/AMD2:2014
_____________
“DB” refers to the IEC on-line database.
© IEC 2015
IEC 60947-2:2006, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-2:2006/AMD1:2009
IEC 60947-2:2006/AMD2:2013
IEC 60947-4-1:2009, Low-voltage switchgear and controlgear – Part 4-1: Contactors and
motor-starters – Electromechanical contactors and motor-starters
IEC 60947-4-1:2009/AMD1:2012
IEC 60947-5-1:2003, Low-voltage switchgear and controlgear – Part 5-1: Control circuit
devices and switching elements – Electromechanical control circuit devices
IEC 60947-5-1:2003/AMD1:2009
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
CISPR 11:2009, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 11:2009/AMD1:2010
CISPR 22:2008, Information technology equipment – Radio disturbance characteristics –
Limits and methods of measurement
2 Terms and definitions
Replace the title and text of the existing clause, modified by Amendment 1, by the following
new title and text:
2 Terms, definitions and index of terms
2.1 General
For the purposes of this document, the terms and definitions given in IEC 60050-441 and
IEC 60947-1 as well as the following apply.
– 4 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
2.2 Alphabetical index of terms
Reference
D
Disconnector . 2.3.1
Disconnector-fuse . 2.3.5
Disconnector-fuse single opening . 2.3.5.1
Disconnector-fuse double opening . 2.3.5.2
F
Fuse-combination unit . 2.3.2
Fuse-disconnector . 2.3.6
Fuse-disconnector single opening . 2.3.6.1
Fuse-disconnector double opening . 2.3.6.2
Fuse-switch . 2.3.4
Fuse-switch single opening . 2.3.4.1
Fuse-switch double opening . 2.3.4.2
Fuse-switch-disconnector . 2.3.8
Fuse-switch-disconnector single opening . 2.3.8.1
Fuse-switch-disconnector double opening . 2.3.8.2
S
Semi-independent manual operation . 2.3.10
Single pole operated three pole device . 2.3.9
Switch-disconnector-fuse . 2.3.7
Switch-disconnector-fuse single opening . 2.3.7.1
Switch-disconnector-fuse double opening . 2.3.7.2
Switch-fuse . 2.3.3
Switch-fuse single opening . 2.3.3.1
Switch-fuse double opening . 2.3.3.2
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
Note 1 to entry: 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.
[SOURCE: IEC 60050-441:1984, 441-14-05, modified – reference to isolating function instead
of isolating distance]
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
[SOURCE: 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
[SOURCE: IEC 60050-441:1984, 441-14-14]
© IEC 2015
2.3.3.1
switch-fuse single opening
switch-fuse which provides an interruption in the circuit on one side of the fuse-link only
Note 1 to entry: With this arrangement safety precautions may be necessary when removing fuse-links.
2.3.3.2
switch-fuse double opening
switch-fuse which provides an interruption in the circuit on both sides of the fuse-link
Note 1 to entry: With this arrangement safety precautions may be necessary when removing fuse-links.
2.3.4
fuse-switch
switch in which a fuse-link or fuse-carrier with fuse-link forms the moving contact
[SOURCE: IEC 60050-441:1984, 441-14-17]
2.3.4.1
fuse-switch single opening
fuse-switch which provides an interruption in the circuit on one side of the fuse-link only
Note 1 to entry: With this arrangement, safety precautions may be necessary when removing fuse-links.
2.3.4.2
fuse-switch double opening
fuse-switch which provides an interruption in the circuit on both sides of the fuse-link
NOTE 1 to entry: With this arrangement, safety precautions may be necessary when removing fuse-links.
2.3.5
disconnector-fuse
disconnector in which one or more poles have a fuse in series in a composite unit
[SOURCE: IEC 60050-441:1984, 441-14-15]
2.3.5.1
disconnector-fuse single opening
disconnector-fuse which provides an opening in the circuit on at least one side of the fuse-
link, that satisfies the requirements specified for the isolating function
Note 1 to entry: With this arrangement, safety precautions may be necessary when removing fuse-links.
2.3.5.2
disconnector-fuse double opening
disconnector-fuse which provides an opening in the circuit that satisfies the requirements
specified for the isolating function 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
[SOURCE: IEC 60050-441:1984, 441-14-18]
2.3.6.1
fuse-disconnector single opening
fuse-disconnector which provides an opening in the circuit on at least one side of the fuse-link
that satisfies the requirements specified for the isolating function
Note 1 to entry: With this arrangement, safety precautions may be necessary when removing fuse-links.
– 6 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
2.3.6.2
fuse-disconnector double opening
fuse-disconnector which provides an opening in the circuit, that satisfies the requirements
specified for the isolating function, 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
[SOURCE: IEC 60050-441:1984, 441-14-16]
2.3.7.1
switch-disconnector-fuse single opening
switch-disconnector-fuse which provides an interruption in the circuit on at least one side of
the fuse-link that satisfies the requirements specified for the isolating function
Note 1 to entry: With this arrangement, safety precautions may be necessary when removing fuse-links.
2.3.7.2
switch-disconnector-fuse double opening
switch-disconnector-fuse which provides an interruption in the circuit on both sides of the
fuse-link that satisfies the requirements specified for the isolating function
2.3.8
fuse-switch-disconnector
switch-disconnector in which a fuse-link or fuse-carrier with fuse-link forms the moving contact
[SOURCE: IEC 60050-441:1984, 441-14-19]
2.3.8.1
fuse-switch-disconnector single opening
fuse-switch-disconnector which provides an interruption in the circuit on at least one side of
the fuse-link that satisfies the requirements specified for the isolating function
Note 1 to entry: With this arrangement, safety precautions may be necessary when removing fuse-links.
2.3.8.2
fuse-switch-disconnector double opening
fuse-switch-disconnector which provides an interruption in the circuit on both sides of the
fuse-link that satisfies the requirements specified for the isolating function
2.3.9
single pole operated three pole device
mechanical unit consisting of three individually operable single pole switches and/or
disconnecting units according to this part, rated as a complete unit for use in a three-phase
system
Note 1 to entry: These mechanical units 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.
© IEC 2015
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
a a a
single opening single opening single opening
Switch-fuse Disconnector-fuse
Switch-disconnector-fuse
b
b
double opening double opening
double opening
Fuse-switch Fuse-disconnector Fuse-switch-disconnector
a a a
single opening single opening single opening
Fuse-switch Fuse-disconnector Fuse-switch-disconnector
b b
double opening double opening double opening
NOTE Equipment shown as single opening may comprise multiple openings in series.
a
The fuse may be on either side of the contacts of the equipment.
b
Depending on the design, breaking may take place on one or both sides of the fuse-link.
4.2 Type of equipment
Replace the existing text of this subclause including 4.2.1, 4.2.2, 4.2.3 and changes
introduced in Amendment 1 by the following:
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 opening or double opening).
5.2 Marking
Replace the existing item 5.2.2.c) by the following:
c) rated operational currents (or rated powers) with the corresponding rated operational
voltage and utilization category (see 4.3.1, 4.3.2 and 4.4);
– 8 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
Replace the existing item 5.2.2 e) by the following:
e) for fuse-combination units, the fuse characteristics and maximum rated current and the
maximum power loss of the fuse-link;
7.1.2 Materials
Delete the heading "7.1.2 Materials" (and associated text modified by Amendment 1).
Retain "7.1.2.2 Glow wire testing".
7.1.4 Clearance and creepage distances
Delete the existing title and text of 7.1.4 (as modified by Amendment 1).
7.1.7.2 Supplementary requirements for equipment with provision for electrical
interlocking with contactors or circuit breakers
Delete the existing title and text of 7.1.7.2 (as modified by Amendment 1).
7.1.7.3 Supplementary requirements for equipment provided with means for
padlocking the open position
Delete the existing title and text of 7.1.7.3 (as modified by Amendment 1).
7.1.12 Degrees of protection of enclosed equipment
Delete the existing title and text of 7.1.12 (as modified by Amendment 1).
7.3.1 Vacant
Replace the title "7.3.1 Vacant” by the following title and text:
7.3.1 General
Subclause 7.3.1 of IEC 60947-1:2007/AMD1:2010 applies.
8.2.5.2 Method of test
Delete the existing title and text of 8.2.5.2 (as modified by Amendment 1).
8.2.5.3 Condition of equipment during and after test
Delete the existing title and text of 8.2.5.3 (as modified by Amendment 1, except Table 9).
8.3.3.1 Temperature rise
Replace the second existing paragraph modified by Amendment 1, starting by "The test shall
be carried out … ", by the following:
As a minimum the test shall be carried out at the rated operational current I . At the
e
manufacturer’s discretion, when I and/or I are higher than I , the higher value may be
th the e
used. In the case of an AC-20 or DC-20 rating, the temperature rise test shall be carried out
at I , or I if the device is in a specified enclosure.
th the
8.3.3.5 Leakage current
Replace the second sentence of the first paragraph by the following:
The leakage current shall be checked across the contact gaps as follows:
© IEC 2015
a) disconnector and switch-disconnector: between load and line terminals;
b) disconnector-fuse, switch-disconnector-fuse, fuse-disconnector and fuse-switch-
disconnector single opening: between load and line terminals;
c) disconnector-fuse, switch-disconnector-fuse, fuse-disconnector and fuse-switch-
disconnector double opening: (i) between line terminals and the fuse-links; (ii) between
load terminals and the fuse-links; and (iii) between load and line terminals.
Add, after the existing Annex C, the following new Annex D:
– 10 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
Annex D
(normative)
Switches, disconnectors, switch-disconnectors and fuse-combination
units for use in photovoltaic (PV) d.c. applications
D.1 General
As part of the answer to the challenge of sustainable development, the number of photovoltaic
(PV) installations is increasing. This latest development in photovoltaic (PV) technology is
challenging the conventional approach to energy sources and power distribution systems,
including their operating conditions and environment.
PV applications have particular characteristics and require equipment with specific
performance. These performance requirements are identified for IEC 60947-3 products in this
annex.
NOTE The abbreviation “PV” (photovoltaic) is used in this annex.
The provisions of IEC 60947-3 are applicable to equipment specified in this annex, where
specifically identified. Clauses, subclauses, tables, figures and annexes of IEC 60947-3 thus
applicable are identified by their particular reference, for example as "4.3.4.1", "Table 2" or
"Annex A".
D.1.1 Scope and object
This annex apply to d.c. switches, disconnectors, switch-disconnectors and fuse-combination
units, rated up to 1 500 V d.c., intended for use in photovoltaic (PV) systems, and hereafter
referred to as "PV switches, PV disconnectors, PV switch-disconnectors and PV fuse-
combination units”.
Switches, disconnectors, switch-disconnectors and fuse-combination units used in PV
systems are subject to electrical, environmental and operational conditions that differ from the
general conditions taken into account in the body of this standard. The requirements have
thus been adapted to reflect these conditions of use.
The object of this annex is to state:
– the requirements for PV switches, PV disconnectors, PV switch-disconnectors and PV
fuse-combination units to be used on the d.c. side of PV applications;
– the tests to verify that the product performance is consistent with the PV applications and
the expected life in PV environmental conditions.
D.1.2 Normative references
Subclause 1.2 applies with the following additions:
IEC 60068-2-14:2009, Environmental testing – Part 2-14: Tests – Test N: Change of
temperature
IEC 62208:2011, Empty enclosures for low-voltage switchgear and controlgear assemblies –
General requirements
D.2 Terms and definitions
Clause 2 applies with the following additions:
© IEC 2015
D.2.3
critical load current
I
crit
value of breaking current, within the range of service conditions, at which the arcing time is
significantly extended
Note 1 to entry: This phenomenon, crucial for PV applications, is due to the low magnetic field coming from the
arc current, creating a slow moving arc.
[SOURCE: IEC 60947-1:2007, 2.5.16, modified – addition of the Note 1 to entry.]
D.3 Classification
Clause 3 applies with the following changes:
D.3.1 According to the utilization category
For PV applications the utilization categories given in existing Table 2 are replaced by DC-
PV0, DC-PV1 or DC-PV2 (see Table D.1).
D.4 Characteristics
Clause 4 applies with the following changes:
D.4.3.5.1 Ability to withstand motor switching overload currents
Subclause 4.3.5.1 is not applicable.
D.4.3.5.2 Rated making capacity
Replace, in the second paragraph of 4.3.5.2, "Table 3" by "Table D.5".
D.4.3.5.3 Rated breaking capacity
Replace, in the second paragraph of 4.3.5.3, "Table 3" by "Table D.5".
D.4.3.6.1 Rated short-time withstand current (I )
CW
Subclause 4.3.6.1 applies as follows:
Equipment with utilization category:
a) DC-PV1: rated short-time withstand current is not applicable;
b) DC-PV0 and DC-PV2: in accordance with 4.3.6.1.
D.4.4 Utilization category
Replace the existing text of 4.4 by the following:
The utilization categories define the intended application and are given in Table D.1.
Each utilization category is characterized by the values of the currents and voltages,
expressed as multiples of the rated operational current and rated operational voltage, as well
as the time constant of the circuit. The conditions for making and breaking given in Table D.5
correspond to the application listed in Table D.1.
– 12 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
Table D.1 – Utilization categories
Utilization category Typical applications
DC-PV0 Opening and closing a PV circuit to provide disconnection when no current is flowing.
DC-PV1 Connecting and disconnecting single PV string(s) where reverse currents and
significant overcurrent cannot occur.
DC-PV2 Connecting and disconnecting PV circuits where significant overcurrents may prevail
and where current flow can be in both directions; for example, where several strings
are connected in parallel and to the same inverter, or, one or more strings with a
battery.
D.5 Product information
Clause 5 applies with the following modifications:
D.5.2 Marking
Replace the last paragraph of 5.2.1 by the following new paragraph:
Devices of utilization category AC-20A, AC-20B, DC-20A, DC-20B and DC-PV0 shall be
marked "Do not operate under load", unless the device is interlocked to prevent such
operation.
Replace the existing item 5.2.2.c) by the following:
c) rated operational currents (or rated powers) with the corresponding rated operational
voltage and utilization category (see 4.3.1, 4.3.2 and D.4.4);
Add to the existing list in 5.2.2 the following new item h):
h) PV category: “DC-PV0”, “DC-PV1” or “DC-PV2”.
Add to the existing list in 5.2.4 the following new items h), i), j) and k):
h) diagram and method of series connecting poles of mechanical switching devices for each
operational rating;
i) appropriate connection to the PV generator and load, if applicable;
j) “+” and “-“ polarities, if applicable;
k) suitable for indoor or outdoor use.
D.6 Normal service, mounting and transport conditions
Clause 6 applies, with the following changes:
This annex covers the use of PV switches, PV disconnectors, PV switch-disconnectors and
PV fuse-combination units for use in the alternative service arrangements detailed in
Table D.2.
© IEC 2015
Table D.2 – Service arrangements
Unenclosed Unenclosed PV switches, PV disconnectors, PV switch-disconnectors or PV fuse-
combination units that have a conventional free air thermal current rating and which are
suitable for installation within a cabinet or enclosure.
Enclosed Enclosed PV switches, PV disconnectors, PV switch-disconnectors or PV fuse-combination
units that have a conventional enclosed thermal current rating and which are suitable for
installation in indoor or outdoor locations.
D.6.1.1 Ambient air temperature
Replace 6.1.1 of IEC 60947-1:2007/AMD2:2014 by the following:
The ambient air temperature does not exceed the maximum and minimum values given in
°
Table D.3. Daily average ambient temperature over a period of 24 h does not exceed 35 C.
Table D.3 – Environmental conditions
Environmental Maximum ambient Minimum
class temperature without ambient Comment
de-rating temperature
Unenclosed +40 °C –5 °C Guidance on de-rating for higher ambient air
O
temperature up to 70 C may be provided. In addition
guidance on operation at temperature lower than -5 °C
may also be given.
Enclosed – –5 °C Normal indoor service conditions in accordance with
+40 °C
Indoor Clause 6.
Enclosed – +40 °C (without solar –25 °C Rating apply when the enclosed equipment is subject to
Outdoor solar radiation of 1,2 kW/m and the maximum ambient
effects)
temperature.
Guidance may be provided on de-rating of enclosed
equipments to be installed in locations with a higher
maximum ambient temperature and/or lower minimum
ambient temperature
Ambient air temperature is that existing in the vicinity of the equipment if supplied without an
enclosure, or in the vicinity of the enclosure if supplied with an enclosure.
D.7 Constructional and performance requirements
Clause 7 applies with the following addition:
Enclosures shall comply with IEC 62208.
D.7.1.4 Clearances and creepage distances
Subclause 7.1.4 of IEC 60947-1:2007/AMD2:2014 applies with the following modification:
The minimum rated impulse voltage shall be in accordance with Table D.4.
D.7.1.12 Degrees of protection of enclosed equipment
Subclause 7.1.12 of IEC 60947-1:2007 applies with the following addition:
The degree of protection provided by the enclosure against contact with live parts, ingress of
solid foreign bodies and water as indicated by the IP code according to Annex C of
– 14 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
IEC 60947-1:2007/AMD1:2010, shall be declared by the manufacturer. For indoor enclosed
and outdoor enclosed equipment this shall not be less than IP2X and IP33, respectively.
D.7.2.3 Dielectric properties
Subclause 7.2.3 of IEC 60947-1:2007/AMD1:2010 applies with the following changes:
PV switches, PV disconnectors, PV switch-disconnectors and PV fuse-combination units shall
have a rated impulse withstand voltage as given in Table D.4.
NOTE In general, for PV circuits, overvoltage category II is assumed, and the impulse withstand voltage ratings
for the PV circuit are assigned based on the PV system voltage, with a minimum impulse voltage of 2,5 kV.
Table D.4 – Rated impulse withstand levels for PV switches, PV disconnectors, PV
switch-disconnectors or PV fuse-combination units
Maximum value of rated Impulse withstand voltage
operational voltage d.c. used in d.c. PV equipment
V kV
300 2,5
600 4,0
1 000 6,0
1 500 8,0
NOTE 1 Interpolation is not permitted in main circuits.
NOTE 2 These values are based on requirements in IEC 60364-7-712 for overvoltage category II as defined in
IEC 60664-1 and IEC TR 60664-2-1:2011, Annex D.
NOTE 3 The application of surge arrestors is the responsibility of the assembly/installation designer.
D.7.2.4.1 Making and breaking capacities
Replace 7.2.4.1 by the following:
PV switches, PV switch-disconnectors and PV fuse-combination units shall be capable of
interrupting any current up to their rated making and breaking capacities. Compliance with these
requirements is checked by the tests of 8.3.3 as modified by D.8.3.3.3.1.
The rated making and breaking capacities are stated by reference to the rated operational
voltage, rated operational current and to the PV utilization category according to Table D.5.
Test conditions are as specified in D.8.3.3.3.1.
For PV switches, PV switch-disconnectors and PV fuse-combination units with a utilization
category DC-PV1 the test supply shall be connected in accordance with the terminal markings
(generator, load, “+” and “-“). Equipment with a utilization category DC-PV2 shall have one
sequence of tests carried out on a sample with the test supply and load connected to the main
poles as convenient. Unless the manufacturer can demonstrate the contact system and arc
control arrangement is symmetrical in respect of current flow in each pole, the sequence shall
then be repeated on a new sample with the supply and load terminals interchanged.
© IEC 2015
Table D.5 – Verification of rated making and breaking capacities (see 8.3.3.3) –
Conditions for making and breaking corresponding to the DC-PV category
Utilization Making and breaking
Number of
a
categories
operating cycles
L/R
I/I and I /I U/U
e c e e
ms
DC-PV0 – – –
DC-PV1 1,5 1,05 1 5
DC-PV2 4 1,05 1 5
a
One switching operation without current between each making and breaking operation is allowed, providing it
does not alter the time interval between the prescribed operations as defined in D.8.3.3.3.1.
D.7.2.4.2 Operational performance
Replace 7.2.4.2 by the following:
Tests concerning the verification of the operational performance of equipment are intended to
verify that the equipment is capable of making and breaking without failure any current up to
the rated current, including the critical load current. Compliance with the operational
performance requirements is checked by the tests of 8.3.4 as modified by D.8.3.4.1.1.
NOTE Requirements for operation at the critical load current is dealt with separately in D.7.2.8.
The number of operating cycles and the test circuit parameters for the operational
performance tests for the various utilization categories are given in Table D.6 and Table D.7.
Test conditions are as specified in D.8.3.4.1.1.
For PV switches, PV disconnectors, PV switch-disconnectors and PV fuse-combination units
with a utilization category DC-PV1, the test supply shall be connected in accordance with the
terminal markings (generator, load, “+” and “-“). Equipment with a utilization category DC-PV2
shall have one sequence of tests carried out on a sample with the test supply and load
connected to the main poles as convenient. Unless the manufacturer can demonstrate the
contact system and arc control arrangement is symmetrical in respect of current flow in each
pole, the sequence shall then be repeated on a new sample with the supply and load
terminals interchanged.
Table D.6 – Number of operating cycles
a
Rated operational Number of operating cycles
Number of
current I
operating cycles
e
c d
b
Without current With current Total
per hour
A
120 9 700 300 10 000
I ≤ 100
n
100 < I 315 120 7 800 200 8 000
≤
n
60 4 800 200 5 000
315 < I ≤ 630
n
630 < I ≤ 2 500 20 2 900 100 3 000
n
2 500 < I 10 1 900 100 2 000
n
a
At the discretion of the manufacturer, the number of operating cycles with current may be increased whilst
the total number of operating cycles remains unchanged.
b
Column 2 gives the minimum operating rate. This operating rate may be increased with the consent of the
manufacturer, in which case the rate used shall be stated in the test report.
c
During each operating cycle, the PV switches, PV switch-disconnectors and PV fuse-combination units shall
remain closed for a sufficient time to ensure that the full current is established, but not exceeding 2 s.
d
PV disconnectors shall comply with the number of operating cycles in the “Total” column without current.
– 16 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
Table D.7 – Test circuit parameters for Table D.6
Utilization Making and breaking
categories
L/R
I/I and I /I U/U
e c e e
ms
DC-PV1 1 1 1
DC-PV2 1 1 1
Key
I making current
I breaking current
c
I rated operational current
e
U applied voltage
U rated operational voltage
e
D.7.2.4.4 Electrical durability
Subclause 7.2.4.3.2 of IEC 60947-1:2007 applies. Test conditions are specified in D.8.5.2.
D.7.2.8 Critical load current performance
The main circuits of an equipment shall be capable of making and breaking its critical load
current according to D.8.3.8 and as verified by test sequence VI.
D.8 Tests
Clause 8 applies with the following modifications:
D.8.3.1 Test sequences
Subclause 8.3.1 applies with the following addition:
Add to existing Table 10 the following new sequences listed in new Table D.8:
© IEC 2015
Table D.8 – Overall scheme of test sequences (addition)
Sequences Test
Critical load current performance Critical load current test
(see D.8.3.8) Dielectric verification
a
Leakage current
Temperature rise verification
Thermal cycling Thermal cycling test
(see D.8.3.9) Temperature rise verification
Mechanical operation
Dielectric verification
Climatic Climatic test
(see D.8.3.10) Temperature rise verification
Temperature rise verification with solar effects – Temperature rise verification with simulated solar
Enclosed outdoor units only effects
(see D.8.3.11)
Verification of resistance of insulating materials to Glow wire test
abnormal heat and fire
(see D.8.3.12)
Degree of protection – enclosed units only IP test
(see D.8.3.13)
Clearance and creepage distances Measurement of creepage and clearance distances
(see D.8.3.14)
EMC EMC test
(see D.8.4)
a
Only required for equipment suitable for isolation of rated voltage greater than 50 V.
D.8.3.2 General test conditions
D.8.3.2.1 General requirements
Subclause 8.3.2.1 applies with the following addition:
For all tests, the connection of poles of the PV switches, PV disconnectors, PV switch-
disconnectors and PV fuse-combination units shall be as in accordance with the manufacturer
installation instructions.
D.8.3.3.3.1 Test values and conditions
Subclause 8.3.3.3.1 applies with the following modifications:
Replace all references to "Table 3" by "Table D.5".
Subclause 8.3.3.3.1, seventh paragraph is not applicable.
D.8.3.4.1.1 Test values and conditions
Subclause 8.3.4.1.1 applies with the following modifications:
Replace all references to existing "Table 4" and "Table 5" by "Table D.6" and "Table D.7",
respectively.
– 18 – IEC 60947-3:2008/AMD2:2015
© IEC 2015
D.8.3.5.1.2 Test circuit
Replace 8.3.5.1.2 by the following:
Subclause 8.3.4.1.2 of IEC 60947-1:2007/AMD1:2010 applies.
The time constant of the test circuit shall be 1 ms.
At the discretion of the manufacturer, a higher value of time constant may be used. In this
case, it should be stated in the test report.
D.8.3.6.2.2 Test circuit
Replace 8.3.6.2.2 by the following:
Subclause D.8.3.5.1.2 applies.
D.8.3.7.1 Overload test
Subclause 8.3.7.1 applies with the following changes:
Replace the existing first paragraph with the following:
The equipment shall first be temperature-conditioned at room temperature. The test current is
1,45 × I or 1,45 × I for a period of 1 h, or until one or more of the gPV fuse-links operate.
the th
If the time is less than the specified period, the time shall be recorded in the test report.
D.8.3.8 Test sequence VI: critical load current performance
D.8.3.8.1 Determination of critical load current
D.8.3.8.1.1 Test values and conditions
This test does not apply to PV disconnectors, PV fuse-disconnectors and PV disconnector-
fuses.
The test shall be made at the rated operational voltage U assigned by the manufacturer to
e
the PV switches, PV switch-disconnectors and PV fuse-combination units.
The time constant of the test circuit shall be 1 ms.
At the discretion of the manufacturer, a higher value of time constant may be used. The same
value of time constant should be used for all tests carried out to determine the critical load
current. In this case, it should be stated in the test report.
The PV switches, PV switch-disconnectors and PV fuse-combination units shall be opened
seven times, manually or mechanically at the manufacturer’s discretion, on to each of the test
currents: 4 A, 8 A, 16 A, 32 A and 63 A, and steps of two times the previous current thereafter
until a maximum arcing time is determined, without exceeding rated operational current. If the
extinction time does not show a peak with shorter times each side, within the range of test
currents, there is no critical load current. If a maximum in arcing time is shown, this is at the
critical load current. Test currents shall be within the nominated value ±10 %. At the
manufacturer’s discretion, the test at each value of current may be carried out on a new
sample.
© IEC 2015
During each cycle, the PV switches, PV switch-disconnectors and PV fuse-combination units
shall remain closed for a time sufficient to ensure that the full current is established, but not
exceeding 2 s.
The number of operating cycles per hour shall be in accordance with Table D.6.
In the case of equipment of Category DC-PV1, all the operations shall be with the supply
connected in accordance with the generator and
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