IEC 60947-3:2020/AMD1:2025

IEC 60947-3 ®
Edition 4.0 2025-04
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 60947-3:2020-04/AMD1:2025-04(en-fr)

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IEC 60947-3 ®
Edition 4.0 2025-04
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
INTERNATIONALE
ICS 29.120.40, 29.130.20 ISBN 978-2-8327-0366-3

– 2 – IEC 60947-3:2020/AMD1:2025
© IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 3: Switches, disconnectors, switch-disconnectors and
fuse-combination units
AMENDMENT 1
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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 60947-3 ED4 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.
This amendment includes the following significant technical changes with respect to the current
edition:
– addition of remotely operated devices;
– addition of a new Annex G defining the requirements for DC disconnectors,
switch-disconnectors and fuse combination units for use in Battery Power Supplies (BPS)
that are used in battery energy storage systems (BESS);

© IEC 2025
– addition of test requirements for short circuit making of single-phase operated switches and
switch-disconnectors;
– switches for photovoltaic applications with utilisation categories DC-PV1 and DC-PV2 can,
subject to marking, be suitable for current flow in one or both directions;
– more clarity in Annex F on the measurement of power loss in devices incorporating
electronics and different pole configurations in DC devices.
The text of this Amendment is based on the following documents:
Draft Report on voting
121A/645/FDIS 121A/675/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
___________
2 Normative references
Add the following new references:
IEC 60068-2-14:2023, Environmental testing – Part 2-14: Tests – Test N: Change of
temperature
IEC 62208:2023, Empty enclosures for low-voltage switchgear and controlgear assemblies –
General requirements
– 4 – IEC 60947-3:2020/AMD1:2025
© IEC 2025
3.3 General terms
Add the following new terms:
3.3.11
remotely operated equipment
switching equipment that is electrically operated from a point distant from the controlled
switching device
Note 1 to entry: A remotely operated switch can have an additional feature for either local or manual (non-electrical)
operation, or both.
Note 2 to entry: Remote operation can be performed by an integral device or an auxiliary device associated with
the switching device, for example, motor operator or coils.
Note 3 to entry: Remote operation can be achieved via physical wiring, wifi, Bluetooth, etc., as defined in the product
documentation.
3.3.12
operating time of a remotely operated equipment
time measured from the instant when the switching operation is initiated at the switching device
to (i) the closing of the main contacts or (ii) the opening of the main contacts
Note 1 to entry: Operating times from closed to open (opening time) and from open to closed (closing time) can be
different.
Note 2 to entry: For a definiton of closing time, see 3.7.44 of IEC 60947-1:2020 and for a definition of opening time,
see 3.7.39 of IEC 60947-1:2020.
4.2 According to the method of operation
4.2.2 Remotely operated equipment
Delete “Under consideration” and add the following:
– remotely operated:
• self-powered remotely operated equipment;
• externally powered remotely operated equipment;
– type of remote operation:
• opening and closing: both opening and close operation controllable from remote;
• opening only: only opening operation controllable from remote.
5 Characteristics
5.2 Type of equipment
Add, after the fifth dash, the following new dash:
– control method of the device.
Add the following new subclause:
5.9 Remote operation
The manufacturer shall declare the following:
a) minimum and maximum values of voltage operating limits for the control supply and, as
applicable, corresponding frequency;
b) the closing time, when applicable (3.7.44 of IEC 60947-1:2020);
c) the opening time (3.7.39 of IEC 60947-1:2020);

© IEC 2025
d) the type of operating signal:
i) permanent signal;
ii) single impulse;
e) information on power consumption for remote operation:
i) nominal power consumption and duration;
ii) inrush power consumption and duration, if applicable;
f) connection arrangement for remote operation.
6 Product information
6.1 Nature of information
Replace the text with the following new text:
Subclause 6.1 of IEC 60947-1:2020 applies with the following modification:
th
Replace, under “Characteristics”, the 7 dash, “rated impulse withstand voltage (see 5.3.1.3)”,
with the following:
– rated impulse withstand voltage (see 5.3.1.3);
a) main power circuit of the equipment.
b) control circuits.
6.2 Marking
Replace the existing Table 3 with the following new table:
Marking
Item Information
location
Indication of the open and close position. If symbols are used, the open position shall be
1.1 indicated by graphical symbol IEC 60417-5008:2002-10 and the closed position by Visible
graphical symbol IEC 60417-5007:2002-10 (see 8.1.6.1 of IEC 60947-1:2020).
1.2 Suitability for isolation. The appropriate symbols of Table 1 shall be used. Visible
Additional marking for disconnectors.
Devices of utilization category AC-20A, AC-20B, DC-20A, DC-20B, DC-PV0 and DC-
1.3 Visible
BPS0 shall be marked "Do not operate under load" adjacent to these categories, unless
the device has interlocking means to prevent such an operation.
Additional marking for remotely operated equipment.
1.4 Visible
When remote closing is provided this mode of operation shall be clearly indicated on the
product if a locking means in the OFF position is not provided.
2.1 Manufacturer's name or trademark. Marked
2.2 Type designation or catalogue reference. Marked
Rated operational currents (or rated powers) with the corresponding rated operational
2.3 voltage and utilization category, (see 5.3.2, 5.3.3 and as applicable, 5.4, D.5.4 or Marked
G.5.4).
Value (or range) of the rated frequency or the indication "DC" (or the symbol
2.4 Marked
IEC 60417-5031:2002-10).
For fuse-combination units, the fuse type characteristics and maximum rated current
a
2.5
Marked
and the maximum power loss of the fuse-link.
2.6 IEC 60947-3, if the manufacturer claims compliance with this document. Marked
2.7 Degree of protection of enclosed equipment (see Annex C of IEC 60947-1:2020). Marked
Terminals shall be identified "load" and "line", unless the connection is immaterial
2.8 Marked
(see 9.3.4.4.1).
– 6 – IEC 60947-3:2020/AMD1:2025
© IEC 2025
Marking
Item Information
location
Neutral pole terminal, if applicable, shall be identified by the letter "N" (see 8.1.8.4 of
2.9 Marked
IEC 60947-1:2020).
2.10 Marked
When a protective earth terminal is provided, it shall be identified by the symbol
IEC 60417-5019:2006-08 (see 8.1.10.3 of IEC 60947-1:2020).
2.11 "+" and "−" polarities, if applicable. Marked
3.1 Classification of equipment if remotely controlled: Literature
– Remotely operated.
3.2 Rated insulation voltage. Literature
Rated impulse withstand voltage:
3.3 – Main power circuit of the equipment. Literature
– Control circuits.
3.4 Pollution degree, if different from 3. Literature
3.5 Rated duty (see 5.3.5 and Clause A.2). Literature
3.6 Rated short-time withstand current and duration, where applicable. Literature
3.7 Rated short-circuit making capacity, where applicable. Literature
3.8 Rated conditional short-circuit current, where applicable. Literature
Diagram and method of series connecting poles of mechanical switching devices for
3.9 Literature
each operational rating, if applicable.
For switches in accordance with Annex D and Annex G – appropriate connections to the
3.10 Literature
PV generator or supply and load, if applicable.
For devices in accordance with Annex D and Annex G – suitable for indoor or outdoor
3.11 Literature
use.
3.12 Closing time for equipment that can be closed remotely (see 3.3.12 operating time of a Literature
remotely operated equipment).
3.13 Opening time of a remotely operated equipment (see 3.3.12 operating time of a remotely Literature
operated equipment).
3.14 Connection arrangement for remote operation. Literature
3.15 Type of operating signal if remotely operated: Literature
– Permanent signal.
– Single impulse.
3.16 Details of power consumption for remote operation Literature
– Nominal power consumption and duration
– Inrush power consumption and maximum duration, if applicable.
3.17 Minimum and maximum values of voltage operating limits for the control supply and, as Literature
applicable, corresponding frequency.
Key
Visible: visible from the front when the device is installed as in service in accordance with the manufacturer's
instructions and the actuator is accessible and operable.
Marked: marked on the product but need not be visible when the device is installed as in service in accordance
with the manufacturer's instructions.
Literature: in the manufacturer's literature. (A visible digital link, for example a QR-code, may be added on the
product to guide user to literature in electronic/digital format).
In information relating to auxiliaries shall be marked on the auxiliary or the product. If space is insufficient the
data shall be given in the manufacturer's literature.
a
Shall be visible after the product is installed in accordance with the manufacturer's instructions but need not
necessarily be visible from the front.

© IEC 2025
8.1 Constructional requirements
Add the following new subclause:
8.1.10 Additional requirements for remotely operated equipment
All remotely operated equipment with an isolation function shall have a manual means of
opening when operating power is not available.
8.2 Performance requirements
8.2.1.1 General
Add, at the end of the subclause, the following new text:
In the case of remotely operated equipment, unexpected simultaneously remote and manual
operation shall be prevented, unless alternative precautions are used, for example:
i) it is possible to disable the remote operation mode when the operator is local to the
device;
ii) the device operation is triggered at the device only (local operation) by an electric
signal (e.g. via a pushbutton);
iii) simultaneous operation does not present any danger for the operator (for example:
trip free mechanism). If accessible parts are subjected to movement during the
remote operation when the operator is local to the device, these parts shall be
arranged such that they do not represent a danger to the operator.
In the case of equipment that can be closed remotely, it shall be possible to prevent the remote
closing operation. The means to prevent remote closing shall be defined in the product
documentation.
When a means is provided to lock the device in the open position, remote closing of the device
shall be prevented when it is locked open. The means of locking shall be defined in the product
documentation.
The means of checking correct operation of the local and remote operation shall be defined in
the product documentation.
NOTE In some applications, for safety reasons, remote operation is always required, for example, emergency stop
or where continuity of service is essential.
Add the following new subclause:
8.2.1.5 Power operated equipment
Subclause 9.3.3.2.1 of IEC 60947-1:2020, power operated equipment, applies with the following
addition.
All remotely operated devices, excluding AC-20 and DC-20 devices, shall have an operating
mechanism with the same characteristics as independent manual operation.
8.3.3.2 Equipment incorporating electronic circuits
Delete the last sentence and the warning label.

– 8 – IEC 60947-3:2020/AMD1:2025
© IEC 2025
9 Tests
9.3.4.1 General
Add, at the end of the subclause, the following new paragraph:
When a device is suitable for dependent or semi-independent manual operation and remote
operation, the making and breaking capacities shall be verified by conducting the full test
sequence both manually and remotely. Two samples may be used. When a device is suitable
for independent manual operation and uses the same operating mechanism for remote
operation it shall be verified using the manually independent or remote mode of operation.
9.3.4.3.1 General
Replace the existing text with the following new text:
Subclause 9.3.3.4.1 of IEC 60947-1:2020 applies with the following additional note.
NOTE Attention is drawn to basic safety standard IEC 61140, and IEC 60364-5-53; both require a minimum
overvoltage category III for an isolation function.
9.3.5.1 General
Add, at the end of the subclause, the following new text:
If the equipment to be tested includes current transformers with external connection, the core
of the current transformer, if intended to be earthed, and all terminals of secondary windings
for external connection shall be connected to earth.
When a device is suitable for dependent or semi-independent manual operation and remote
operation, the ability to make and/or break currents shall be verified by conducting the full test
sequence both manually and remotely. Two samples may be used.
9.3.5.2.1 Test values and conditions
Add, at the beginning of the subclause, the following new text:
Devices suitable for manual or remote operation shall have their operations carried out using
manual or remote means as applicable.
When a device is suitable for remote and independent manual operation, 80 % of the total
operations shall be carried out remotely and 20 % manually, with the number of operations
rounded to the nearest whole number. 80 % of the specified operations with current shall be
carried out using the remote operating mode and 20 % in the manual mode.
When manual operation involves the use of external power (i.e. stored energy charging motor),
the 20 % of manual operations specified above can be carried out using external power, except
for 10 operating cycles without current which shall be carried out using the manual (hand, no
electrical power) operating means.
9.3.5.2.6 Condition of the equipment after the operational performance test
Replace the second and third paragraphs with the following new paragraphs:
For manual operation, the manual force required for any opening action shall not be greater
than the test force of 9.2.6.2 of IEC 60947-1:2020 and Table 17 of IEC 60947-1:2020.

© IEC 2025
A closing operation is considered satisfactory when normal operation will close the contacts
sufficiently for the equipment to be able to carry its rated operational current.
9.3.6.1 General
Add, at the end of the subclause, the following new text:
When a device is suitable for dependent or semi-independent manual operation and remote
operation, the ability to make, break or withstand short-circuit currents shall be verified by
conducting the full test sequence both manually and remotely. When a device is suitable for
independent manual operation and remote operation it shall be verified by using the manually
independent or remote mode of operation.
9.3.6.2.4 Test procedure
Replace the text with the following new text:
The temporary connections B are replaced by the equipment under test, with test cables if
applicable, (see 9.3.3.1) and the test current is applied for the specified time with the equipment
in the closed position.
9.3.6.3.4 Test procedure
Replace the text with the following new text:
The temporary connections B are replaced by the equipment under test, with test cables if
applicable (see 9.3.3.1), and the equipment shall be closed twice with an interval of
approximately 3 min between these operations on a prospective peak current not less than the
rated short-circuit making capacity of the equipment. The current or voltage shall be maintained
for at least 0,05 s.
9.3.7.2.4 Test procedure
Replace the second paragraph with the following new text:
The temporary connections are replaced by the equipment under test, with the test cables if
applicable (see 9.3.3.1), and the test current applied according to 9.3.7.3.1. The recovery
voltage shall be maintained for at least 0,05 s after interruption of the test current by the circuit-
breaker.
9.3.7.3.4 Test procedure
Replace the second paragraph with the following new text:
The temporary connections are replaced by the equipment under test, with test cables if
applicable (see 9.3.3.1), and the test current applied according to 9.3.7.3.1.
9.3.7.5 Leakage current
Replace the existing text with the following new text:
Subclause 9.3.4.6 applies, except that the maximum value of leakage current shall not exceed
2 mA per pole for all utilization categories.

– 10 – IEC 60947-3:2020/AMD1:2025
© IEC 2025
Annex C
(normative)
Single pole operated three-pole switches
C.1 General
Replace the first sentence of the second paragraph with the following new text:
The test requirements according to this document for verification of making and breaking
capacities, operational performance, short circuit making capacity and conditional short-circuit
withstand, apply to devices with poles operated simultaneously.
C.2 Tests
Add the following new dash after the second dash:
– 9.3.6.3 – Short circuit making capacity test;
C.3.1 Making and breaking capacities (9.3.4.3) and operational performance (9.3.5.2)
Replace the title with the following new title:
C.3.1 Making and breaking capacities (9.3.4.4) and operational performance (9.3.5.2)
Add the following new subclause:
C.3.3 Short circuit making test for switches and switch-disconnectors
For the making test of the switch/switch disconnector, the following test shall be applied.
With L1 open and L2 closed, L3 is subjected to the required make cycle. The test shall be
performed in a three-phase test circuit according to Figure 11 of IEC 60947-1:2020.

© IEC 2025
Annex D
(normative)
Switches, disconnectors, switch-disconnectors and fuse combination
units for use in photovoltaic (PV) DC applications
D.5 Characteristics
D.5.3.6.2 Rated making capacity
Replace "Table D.6" with "Table D.5".
D.5.3.6.3 Rated breaking capacity
Replace "Table D.6" with "Table D.5".
Table D.1 – Utilization categories
Replace the existing Table D.1 with the following new table:
Table D.1 – Utilization categories
Utilization categories Typical applications
DC-PV0 Opening and closing a PV circuit to provide disconnection when no current is flowing.
Opening and closing single PV string(s) or circuits where significant overcurrent
DC-PV1
cannot occur.
Opening and closing PV circuits where significant overcurrent may prevail, and where
DC-PV2 current flow can be in both directions; for example, where several strings are
connected in parallel and to the same inverter.

Table D.4 – Rated impulse withstand level for PV switches, PV disconnectors, PV
switch-disconnectors or PV fuse-combination units
Replace the existing Table D.4 with the following new table:
Table D.4 – Rated impulse withstand level for PV switches, PV disconnectors, PV
switch-disconnectors or PV fuse-combination units
Maximum value of rated Impulse withstand Impulse withstand Impulse withstand
operational voltage DC voltage used in DC voltage used in DC voltage used in DC
PV equipment PV equipment PV equipment
(overvoltage (overvoltage (overvoltage
category II) category III) category IV)
V kV kV kV
300 2,5 4,0 6,0
600 4,0 6,0 8,0
1 250 6,0 8,0 12,0
1 500 8,0 10,0 15,0
Interpolation is not permitted in main circuits.
NOTE 1 These values are based on requirements as defined in IEC 60664-1.
NOTE 2 The application of surge protective devices (SPD) is the responsibility of the assembly or installation
designer.
– 12 – IEC 60947-3:2020/AMD1:2025
© IEC 2025
D.8 Constructional and performance requirements
Replace the existing text with the following new text:
Clause 8 applies with the following changes.
Add the following new subclause:
D.8.1.1 General
Add the following text at the end of 8.1.1.
Enclosures shall comply with IEC 62208.
D.8.2.4.1 Making and breaking capacities
Replace, in the fourth paragraph, the existing text with the following new text:
For PV switches, PV switch-disconnectors and PV fuse-combination units with a utilization
category DC-PV1, the test supply and the load shall be connected in accordance with the
terminal markings (generator, load, "+" and "−"). Equipment with a utilization category DC-PV1
and unmarked terminals, and 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.
D.9.3.5.2.2 Test circuit
Replace the existing text with the following new text:
Subclause 9.3.3.5.2 of IEC 60947-1:2020 applies with the following change and addition.
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.9.3.6.2.2 Test circuit
Replace "Subclause D.9.3.5.2.2 applies" with the following new text:
Subclause 9.3.6.2.2 applies except the time constant shall be 1,0 ms.
D.9.5.2 Electrical durability
Replace the existing first paragraph with the following new text:
The electrical durability test (see D.8.2.4.4 and 9.1.5), where required, is made in accordance
with the appropriate requirements of 9.3.5.2 as modified by D.9.3.5.2.1 and D.9.3.5.2.2, except
that for equipment suitable for isolation, the maximum value of leakage current shall not exceed
2 mA per pole for utilization categories DC-PV1 and DC-PV2.

© IEC 2025
Annex E
(normative)
Additional requirements for LV switchgear intended
for connection of aluminium conductors
E.8 Constructional and performance requirements
Replace the existing first paragraph with the following new text:
Clamping units of devices and their accessories (including the terminals) which are not made
of aluminium or aluminium alloy intended for use with aluminium conductor(s) shall be treated
with an electrically conductive coating such as tin, or alternative means that will inhibit corrosion
due to difference in electrochemical series.

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© IEC 2025
Annex F
(informative)
Power loss
F.2.1 General
Add the following text at the end of the subclause:
For products complying with this document that are suitable for AC and DC applications, the
power loss can be assumed to be the AC value, providing the pole configuration is identical.
Where this is not the case, separate AC and DC tests have to be carried out.
For products covered by this document and only suitable for DC, the DC power loss shall be
measured using a DC current.
DC power loss is evaluated as in F.2.4, or F.2.5, as applicable.
F.2.4 Switches and/or disconnectors of rated current not exceeding 400 A
Replace the existing paragraph with the following new text:
For AC switches, disconnectors and switch-disconnectors without integrated electronics, and
of a rated current not exceeding 400 A, it is acceptable to use a single-phase AC measurement
without power factor measurement.
F.2.5 Fuse combination units and fuse disconnectors of rated current not exceeding
400 A
Replace the existing first paragraph with the following new text:
For AC fuse disconnectors and fuse-combination units, without integrated electronics, and of a
rated current not exceeding 400 A, it is acceptable to use single-phase AC measurement
without power factor measurement.
Delete the last three paragraphs.

© IEC 2025
Add the following new Annex G:
Annex G
(normative)
DC disconnectors, switch-disconnectors and fuse-combination units for
use with battery power supplies (BPS) DC applications
G.1 General
G.1.1 Background
The development of battery power supplies (BPS) technology is challenging the conventional
approach to energy sources and power distribution systems, including their operating conditions
and environment.
When a DC disconnector, switch disconnector or fuse-combination unit is directly connected
and located electrically between the battery and the power convertor in a battery energy storage
system (BESS) in accordance with IEC 62933-5-2, the device requires particular characteristics
and specific performance. These performance requirements are identified for IEC 60947-3
products in Annex G.
G.1.2 Object
Annex G applies to DC disconnectors, switch-disconnectors and fuse-combination units, rated
up to 1 500 V DC, intended for use with BPS systems, and hereafter referred to as "BPS
disconnectors, BPS switch-disconnectors and BPS fuse-combination units".
Disconnectors, switch-disconnectors and fuse-combination units used with BPS systems are
subject to electrical, environmental and operational conditions that differ from the general
conditions taken into account in the main body of this document. The requirements have thus
been adapted to reflect these conditions of use.
The object of Annex G is to state:
– the requirements for BPS disconnectors, BPS switch-disconnectors and BPS
fuse-combination units to be used on the DC side of BPS applications;
– the tests to verify that the product performance is consistent with the BPS applications and
the expected life in BPS environmental conditions.
G.2 Vacant
G.3 Vacant
G.4 Classification
Clause 4 applies with the following changes:
G.4.1 According to the utilization category
For BPS applications, the utilization categories given in Table 2 are replaced by DC-BPS0,
DC-BPS1 as given in Table G.1.

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© IEC 2025
G.5 Characteristics
Clause 5 applies with the following changes:
G.5.3.6.1 Ability to withstand motor switching overload currents
Subclause 5.3.6.1 is not applicable.
G.5.3.6.2 Rated making capacity
Replace, in the second paragraph of 5.3.6.2 "Table 4" by "Table G.5".
G.5.3.6.3 Rated breaking capacity
Replace, in the second paragraph of 5.3.6.3 "Table 4" by "Table G.5".
G.5.4 Utilization category
Replace the existing text of 5.4 by the following:
The utilization categories define the intended application and are given in Table G.1.
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 G.5 correspond
to the application listed in Table G.1.
Table G.1 – Utilization categories
Utilization category Typical applications
DC-BPS0 Opening and closing a BPS circuit to provide disconnection when no current is flowing.
DC-BPS1 Opening and closing a BPS circuit, where significant overcurrent may prevail, to
provide disconnection where current flow can be in both directions

G.6 Product information
Clause 6 applies.
G.7 Normal service, mounting and transport conditions
Clause 7 applies, with the following changes and additions:
Annex G covers the use of BPS disconnectors, BPS switch-disconnectors and BPS
fuse-combination units for use in the alternative service arrangements detailed in Table G.2.
Table G.2 – Service arrangements
Unenclosed Unenclosed BPS disconnectors, BPS switch-disconnectors or BPS fuse-combination units that
have a conventional free air thermal current rating and which are suitable for installation within a
cabinet or enclosure, which may be suitable for indoor or outdoor use.
Enclosed Enclosed BPS disconnectors, BPS switch-disconnectors or BPS fuse-combination units that have
a conventional enclosed thermal current rating and which are suitable for installation in indoor or
outdoor locations.
© IEC 2025
G.7.1.1 Ambient air temperature
Replace 7.1.1 of IEC 60947-1:2020 by the following:
The ambient air temperature does not exceed the maximum and minimum values given in
Table G.3. Daily average ambient air temperature over a period of 24 h does not exceed 35 °C.
Table G.3 – Environmental conditions
Environmental Maximum ambient Minimum
class air temperature ambient air Comment
without de-rating temperature
Unenclosed +40 °C –5 °C Guidance on de-rating for higher ambient air
temperature up to 70 C may be provided. In addition,
guidance on operation at temperature lower than -
5 °C may also be given.
Enclosed – Normal indoor service conditions in accordance with
+40 °C –5 °C
Indoor Clause 7.
Enclosed – +40 °C (without solar –25 °C Rating applies when the enclosed equipment is
Outdoor effects)
subject to solar radiation of 1,2 kW/m and the
maximum ambient air temperature.
Guidance may be provided on de-rating of enclosed
equipment to be installed in locations with a higher
maximum ambient air temperature and/or lower
minimum ambient air 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.
G.8 Constructional and performance requirements
Clause 8 applies with the following additions:
G.8.1.4 Clearances and creepage distances
Subclause 8.1.4 of IEC 60947-1:2020, applies with the following modification:
The minimum rated impulse voltage shall be in accordance with Table G.4.

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© IEC 2025
Table G.4 – Rated impulse withstand levels for BPS disconnectors,
BPS switch-disconnectors or BPS fuse-combination units
Maximum value of rated Impulse withstand Impulse withstand Impulse withstand
operational voltage DC voltage used in BPS voltage used in BPS voltage used in BPS
equipment equipment equipment
(overvoltage (overvoltage (overvoltage
category II) category III) category IV)
V kV kV kV
300 2,5 4,0 6,0
600 4,0 6,0 8,0
1 250 6,0 8,0 12,0
1 500 8,0 10,0 15,0
Interpolation is not permitted in main circuits.
NOTE 1 These values are based on requirements as defined in IEC 60664-1.
NOTE 2 The application of surge protective devices (SPD) is the responsibility of the assembly or installation
designer.
G.8.1.12 Degrees of protection of enclosed equipment
Subclause 8.1.12 of IEC 60947-1:2020, 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
IEC 60947-1:2020, shall be declared by the manufacturer. For indoor enclosed and outdoor
enclosed equipment this shall not be less than IP2X and IP33, respectively.
G.8.2.3 Dielectric properties
Subclause 8.2.3 of IEC 60947-1:2020, applies.
G.8.2.4.1 Making and breaking capacities
Replace 8.2.4.1 by the following:
BPS switch-disconnectors and BPS fuse-combination units with a utilisation category DC-BPS1
shall be capable of making any current up to their making capacity and breaking any current up
to the rated breaking capacity. Compliance with these requirements is verified by the tests of
9.3.4.4 as modified by G.9.3.4.4.1.
The rated making and breaking capacities are stated by reference to the rated operational
voltage, rated operational current and to the BPS utilization category according to Table G.5.
Test conditions are as specified in G.9.3.5.2.1.
BPS switch-disconnectors and BPS fuse-combination units with a utilization category DC-BPS1
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 2025
Connection of the poles shall be according to the manufacturer`s description.
Table G.5 – Verification of rated making and breaking capacities (see 9.3.4.4) –
Conditions for making and breaking corresponding to the DC-BPS 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-BPS0 – – –
DC-BPS1 1,5 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 required operations as defined in 9.3.4.4.1.

G.8.2.4.2 Operational performance
Replace 8.2.4.2 by the following:
G.8.2.4.2.1 Operational performance at a normal ambient air temperature
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 9.3.5 as modified by G.9.3.5.2.1.
NOTE Requirements for operation at
...