IEC 60269-6:2010

IEC 60269-6 ®
Edition 1.0 2010-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage fuses –
Part 6: Supplementary requirements for fuse-links for the protection of solar
photovoltaic energy systems
Fusibles basse tension –
Partie 6: Exigences supplémentaires concernant les éléments de remplacement
utilisés pour la protection des systèmes d'énergie solaire photovoltaïque

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IEC 60269-6 ®
Edition 1.0 2010-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage fuses –
Part 6: Supplementary requirements for fuse-links for the protection of solar
photovoltaic energy systems
Fusibles basse tension –
Partie 6: Exigences supplémentaires concernant les éléments de remplacement
utilisés pour la protection des systèmes d'énergie solaire photovoltaïque

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 29.120.50 ISBN 978-2-88912-188-5
– 2 – 60269-6 © IEC:2010
CONTENTS
FOREWORD.4
1 General .6
1.1 Scope and object.6
1.2 Normative references .6
2 Terms and definitions, .7
2.2 General terms .7
3 Conditions for operation in service.10
3.4 Voltage.10
3.4.1 Rated voltage .10
3.5 Current.10
3.5.1 Rated Current.10
3.6 Frequency, power factor and time constant .10
3.6.1 Frequency .10
3.6.2 Power factor .10
3.6.3 Time constant.10
3.10 Temperature inside an enclosure .11
4 Classification.11
5 Characteristics of fuses .11
5.1 Summary of characteristics .11
5.1.2 Fuse-links.11
5.2 Rated voltage.11
5.5 Rated power dissipation of the fuse-link .11
5.6 Limits of time-current characteristics .11
5.6.1 Time-current characteristics, time-current zones .11
5.6.2 Conventional times and currents.11
5.6.3 Gates .12
5.7 Breaking range and breaking capacity.12
5.7.1 Breaking range and utilization category .12
5.7.2 Rated breaking capacity .12
6 Markings .12
6.2 Markings on fuse-links.12
7 Standard conditions for construction.12
7.5 Breaking capacity.12
8 Tests .13
8.1 General .13
8.1.4 Arrangement of the fuse and dimensions .13
8.1.5 Testing of fuse-links .13
8.3 Verification of temperature rise limits and power dissipation.14
8.3.1 Arrangement of the fuse-link.14
8.3.3 Measurement of power dissipation of the fuse-link.14
8.3.5 Acceptability of test results.14
8.4 Verification of operation .15
8.4.1 Arrangement of fuse-link.15
8.4.3 Test method and acceptability of test results .15
8.5 Verification of the breaking capacity .15
8.5.1 Arrangement of the fuse .15

60269-6 © IEC:2010 – 3 –
8.5.5 Test method .16
8.5.8 Acceptability of test results.16
8.11 Mechanical and miscellaneous tests.17
Annex AA (normative) Examples of standardized fuse-links for the protection of solar
photovoltaic energy systems.19
Annex BB (informative) Guidance for the protection of Photovoltaic string and array
with fuse-links designed for PV applications .27
Bibliography.28

Figure 101 – Current of test cycling .18
Figure AA.1 – Fuse-links with cylindrical contact caps, type A .20
Figure AA.2 – Fuse-links with cylindrical contact caps type A with striker – Additional
dimensions for sizes 14 × 51, 20 × 127 and 22 × 127 only .21
Figure AA.3 – North American cylindrical fuse-links with blade contacts – Sizes 61-
600 A.
Figure AA.4 – Fuse-links with blade contacts, type C, C referring IEC 60269-2 “Fuse
system A (NH fuse system)”.24
Figure AA.5 – Fuse-links with long blade contacts, type D .26

Table 101 – Conventional times and currents for "gPV” fuse-links.12
Table 102 – Survey of complete tests on fuse-links and number of fuse-links to be
tested .13
Table 103 – Survey of tests on fuse-links of the smallest rated current of a
homogeneous series and number of fuse-links to be tested .14
Table 104 – Values for breaking-capacity tests on “gPV” fuse-links .16

– 4 – 60269-6 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
LOW-VOLTAGE FUSES –
Part 6: Supplementary requirements for fuse-links
for the protection of solar photovoltaic energy systems

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60269-6 has been prepared by subcommittee 32B: Low-voltage
fuses, of IEC technical committee 32: Fuses.
The text of this standard is based on the following documents:
FDIS Report on voting
32B/561/FDIS 32B/569/RVD
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
This part is to be used in conjunction with IEC 60269-1:2006, Low-voltage fuses, Part 1:
General requirements.
This Part 6 supplements or modifies the corresponding clauses or subclauses of Part 1.

60269-6 © IEC:2010 – 5 –
Where no change is necessary, this Part 6 indicates that the relevant clause or subclause
applies.
Tables and figures which are additional to those in Part 1 are numbered starting from 101.
Additional annexes are lettered AA, BB, etc.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60269 series, under the general title: Low-voltage fuses, can be
found on the IEC website.
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 December 2010 have been included in this copy.

– 6 – 60269-6 © IEC:2010
LOW-VOLTAGE FUSES –
Part 6: Supplementary requirements for fuse-links
for the protection of solar photovoltaic energy systems

1 General
IEC 60269-1 applies with the following supplementary requirements.
Fuse-links for the protection of solar photovoltaic (PV) energy systems shall comply with aIl
requirements of IEC 60269-1, if not otherwise indicated hereinafter, and shall also comply
with the supplementary requirements laid down below.
NOTE The abbreviation “PV” (photovoltaic) is used in this document.
1.1 Scope and object
These supplementary requirements apply to fuse-links for protecting PV strings and PV arrays
in equipment for circuits of nominal voltages up to 1 500 V d.c.
Their rated voltage may be up to 1 500 V d.c.
NOTE 1 Such fuse-Iinks are commonly referred to as “PV fuse-links”.
NOTE 2 In most cases, a part of the associated equipment serves the purpose of a fuse-base. Owing to the great
variety of equipment, no general rules can be given; the suitability of the associated equipment to serve as a fuse-
base should be subject to agreement between the manufacturer and the user. However, if separate fuse-bases or
fuse-holders are used, they should comply with the appropriate requirements of IEC 60269 series.
NOTE 3 PV fuse-links protect down stream inverter components such as capacitors or the discharge of capacitors
back into the arrays or array wiring up to the rated breaking capacity.
The object of these supplementary requirements is to establish the characteristics of PV fuse-
links in such a way that they can be replaced by other fuse-links having the same
characteristics, provided that their dimensions are identical. For this purpose, this standard
refers in particular to
a) the following characteristics of fuses:
1) their rated values;
2) their utilisation category;
3) their temperature rises in normal service;
4) their power dissipation;
4) their time-current characteristics;
6)  their breaking capacity;
7) their dimensions or size (if applicable).
b) type tests for verification of the characteristics of fuses;
c) the markings on fuses.
1.2 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.

60269-6 © IEC:2010 – 7 –
IEC 60269-1:2006, Low-voltage fuses – Part 1: General requirements
Amendment 1 (2009)
IEC 60269-2, Low-voltage fuses – Part 2: Supplementary requirements for fuses for use by
authorized persons (fuses mainly for industrial application) – Examples of standardized
systems of fuses A to J
ISO 3, Preferred numbers – Series of preferred numbers
2 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60269-1 as well as
the following apply.
2.2 General terms
2.2.101
photovoltaic fuse-link
fuse-link capable of breaking, under specific conditions, any current value within the breaking
range (see 7.5)
NOTE A PV fuse-link operates under two main conditions:
– Short-circuit in a string or in an array which leads to a very low over-current.
– Short-circuit current supplied by the discharge of the PV inverter through a very low inductance. This
short-circuit condition leads to a very high rate of rise of current equivalent to a low value of time constant,
corresponding to Table 104.
2.2.102
photovoltaic cell
most elementary photovoltaic device which generate d.c. voltage by the absorption of photons
[IEC 61836, 3.1.43 a) and d) modified]
2.2.103
photovoltaic module
complete and environmentally protected assembly of interconnected PV cells
[IEC 61836, 3.1.43 f)]
2.2.104
photovoltaic array, array field, assembly, generator, panel, string, sub-array
2.2.104.1
photovoltaic array
assembly of mechanically integrated and electrically interconnected PV modules, PV panels
or PV sub-array and its support structure
2.2.104.2
photovoltaic array field
aggregate of all PV arrays within a given PV system focusing on the mechanical arrangement
of the PV technology
2.2.104.3
photovoltaic assembly
PV components that are installed outdoors and remote from its loads, including modules,
support structure, foundation, wiring, tracking apparatus, and thermal control (were specified),
___________
There is a consolidated edition 4.1 (2009) that includes IEC 60269-1(2006) and its amendment 1 (2009).

– 8 – 60269-6 © IEC:2010
and including junction boxes, charge controllers and inverters depending on the assembly’s
installed configuration
2.2.104.4
photovoltaic generator
generator that uses the photovoltaic effect to convert sunlight into electricity
2.2.104.5
photovoltaic panel
PV modules mechanically integrated, pre-assembled and electrically interconnected
2.2.104.6
photovoltaic string
circuit of series-connected PV modules
2.2.104.7
photovoltaic sub-array
portion of a PV array that can be considered as a unit
[IEC 61836, 3.3.56 a), b), c), d), e), f) and g)]
2.2.105
inverter
electric energy converter that changes direct electric current to single-phase or polyphase
alternating currents
[IEC 61836, 3.3.15] and [IEV 151-13-46]
2.2.106
junction box
closed or protected enclosure in which circuits are electrically connected
2.2.106.1
array junction box
junction box where PV strings are connected
2.2.106.2
generator junction box
junction box where PV arrays are connected
[IEC 61836, 3.2.16]
2.2.107
standard operating conditions
SOC
–2
operating value of in-plane irradiance (1 000 Wm ), PV device junction temperature equals
the nominal operating PV cell junction temperature (NOCT), and air mass (AM =1,5)
[IEC 61836, 3.4.16 d)]
2.2.108
standard test conditions
STC
–2
reference values of in-plane irradiance (G = 1 000 Wm ), PV cell junction temperature
I,ref
(25 °C), and air mass (AM=1,5) to be used during the testing of any PV device
[IEC 61836, 3.4.16 e)]
60269-6 © IEC:2010 – 9 –
2.2.109
photovoltaic currents
2.2.109.1
load current
(symbol I ) (unit : A)
L
electric current supplied to a load by a PV system
[IEC 61836, 3.4.39 a)]
2.2.109.2
maximum power current
(symbol I ) (unit: A)
PMax
electric current at the conditions of maximum power
[IEC 61836, 3.4.42 a)]
2.2.109.3
rated current
(symbol I ) (unit: A)
R
electric current produced by a PV device at a rated voltage under specified operating
conditions
[IEC 61836, 3.4.69 c)]
2.2.109.4
short-circuit current
(symbol I ) (unit : A)
SC
electric current at the output terminals of a PV device at a particular temperature and
irradiance when the device output voltage is equal to or close to zero
[IEC 61836, 3.4.80]
2.2.110
photovoltaic voltages
2.2.110.1
load voltage
(symbol V ) (unit: V)
L
voltage supplied across the terminals of a load by a PV system
[IEC 61836, 3.4.39 c)]
2.2.110.2
maximum power voltage
(symbol V ) (unit: V)
PMax
voltage at the conditions of maximum power
[IEC 61836, 3.4.42 h)]
2.2.110.3
maximum power voltage under standard operating conditions
(unit: V)
voltage at the maximum power point of a PV device under standard operating conditions, SOC
[IEC 61836, 3.4.42 i)]
2.2.110.4
maximum power voltage under standard test conditions
(unit: V)
voltage at the maximum power point of a PV device under standard test conditions, STC

– 10 – 60269-6 © IEC:2010
[IEC 61836, 3.4.42 j)]
2.2.110.5
open-circuit voltage of PV devices
(symbol V ) (unit: V)
OC
voltage at the output terminals of a PV device at a particular temperature and irradiance when
the output electric current of the PV device is zero
2.2.110.6
open-circuit voltage under standard test conditions
(symbol V )
OC STC
open-circuit voltage as measured under standard test conditions, STC
[IEC 61836, 3.4.56 a)]
2.2.110.7
rated voltage
(symbol V ) (unit: V)
R
voltage at which a generator is designed to generate maximum electricity under specified
operating conditions
[IEC 61836, 3.4.69 k)]
3 Conditions for operation in service
IEC 60269-1 applies with the following supplementary requirements.
3.4 Voltage
3.4.1 Rated voltage
The rated d.c. voltage of a fuse-link shall exceed the maximum value of the open circuit
voltage (V ) of the PV string. See Annex BB.2.1
OC
3.5 Current
3.5.1 Rated Current
The rated current of a fuse-link shall exceed the maximum value of the current produced by
the module. See Annex BB.3.1
3.6 Frequency, power factor and time constant
3.6.1 Frequency
Not applicable
3.6.2 Power factor
Not applicable
3.6.3 Time constant
The time constants expected in practice are considered to correspond to those in Table 104.

60269-6 © IEC:2010 – 11 –
3.10 Temperature inside an enclosure
Since the rated values of the fuse-links are based on specified conditions that do not always
correspond to those prevailing at the point of installation, including the local air conditions,
the user may have to consult the manufacturer concerning the possible need for re-rating.
4 Classification
IEC 60269-1 applies.
5 Characteristics of fuses
IEC 60269-1 applies with the following supplementary requirements.
5.1 Summary of characteristics
5.1.2 Fuse-links
a) Rated voltage (see 5.2)
b) Rated current (see 5.3 of IEC 60269-1)
c) Rated power dissipation (see 5.5)
d) Time-current characteristics (see 5.6)
e) Breaking range (see 5.7.1)
f) Rated breaking capacity (see 5.7.2)
g) Dimensions or size (if applicable)
h) Utilization category (see 5.7.1)
5.2 Rated voltage
For voltages up to 750 V, IEC 60269-1 applies; for higher voltages, the values should be
selected from R5 series or, where not possible, from the R10 series of ISO 3.
5.5 Rated power dissipation of the fuse-link
In addition to the requirements of IEC 60269-1, the manufacturer shall indicate the power
dissipation as a function of current for the range contained between 70 % to 100 % of the
rated current.
5.6 Limits of time-current characteristics
5.6.1 Time-current characteristics, time-current zones
5.6.1.1 General requirements
The time-current characteristics depend on the design of the fuse-link, and, for a given fuse-
link, on the ambient air temperature and the cooling conditions.
The manufacturer shall provide mean time-current characteristics in accordance with the
conditions specified in 8.3.1.
5.6.2 Conventional times and currents
5.6.2.2 Conventional times and currents for "gPV"- fuse-links
The conventional times and currents are given in Table 101.

– 12 – 60269-6 © IEC:2010
Table 101 – Conventional times and currents for "gPV” fuse-links
Conventional current
Rated current Conventional time
Type “gPV”
A h
Inf If
I ≤ 63 1
n
63 < I ≤ 160 2
n
1,13 I 1,45 I
n n
160 < I ≤ 400
n
I > 400
n
5.6.3 Gates
Not applicable.
5.7 Breaking range and breaking capacity
IEC60269-1 applies with the following supplementary requirement.
5.7.1 Breaking range and utilization category
The first letter indicates the breaking range:
– "g" fuse-links (full-range breaking capacity fuse-link).
The following letters indicate the utilization category:
– "gPV" indicates fuse-links with a full-range d.c. breaking capacity for photovoltaic energy
systems.
5.7.2 Rated breaking capacity
The rated breaking capacity is based on type tests performed in a circuit containing linear
components with mean value of applied voltage. The minimum value of the rated breaking
capacity is 10 kA d.c.
6 Markings
IEC 60269-1 applies with the following supplementary requirements.
6.2 Markings on fuse-links
Subclause 6.2 of IEC 60269-1 applies with the following addition:
– utilization category “gPV”.
7 Standard conditions for construction
IEC 60269-1 applies with the following supplementary requirement.
7.5 Breaking capacity
A fuse-link shall be capable of breaking, at rated d.c. voltage, any circuit having a prospective
current between the conventional fusing current and the rated breaking capacity with time
constant not greater than the values specified in Table 104.

60269-6 © IEC:2010 – 13 –
8 Tests
IEC 60269-1 applies with the following supplementary requirements.
8.1 General
8.1.4 Arrangement of the fuse and dimensions
The fuse-link shall be mounted open in surroundings free from draughts and, unless otherwise
specified, in a vertical position (see 8.3.1).
8.1.5 Testing of fuse-links
The following Tables 102 and 103 replaces Tables 11, 12 and 13 of IEC 60269-1.
8.1.5.1 Complete tests
Before the tests are commenced, the internal resistance R of all samples shall be measured
at an ambient-air temperature of (20 ± 5) °C with a measuring current of not more than 0,1 In.
The value R shall be recorded in the test report.
A survey of the complete tests is given in Table 102.
8.1.5.2 Type test exemptions for fuse-links of a homogeneous series
Fuse-links having intermediate values of rated current of a homogeneous series are exempted
from type tests if the fuse-link of the largest rated current has been tested to the requirements
of 8.1.5.1 and if the fuse-link of the smallest rated current has been submitted to the tests
indicated in Table 103.
Table 102 – Survey of complete tests on fuse-links and number
of fuse-links to be tested
Test according to subclause Number of samples
1 3 1 1 3 3 1 1 1
8.1.4 Dimensions X X   X X
8.1.5.1 Resistance X X X X X X X X X
8.3 Temperature rise and power dissipation X
8.4.3.2 Verification of rated current X
8.11.2.4 Verification of freedom from unacceptable levels of  X X X X X
thermally induced drift
After 50 temperature cycles, but tested at ambient
temperature
8.4.3.1 Conventional non-fusing current (I)   X
nf
Conventional fusing current (I)   X
f
8.5 No.1 Breaking capacity and operating   X
characteristics (Table 104)
No.2 Breaking capacity and operating   X
characteristics (Table 104)
No.5 Breaking capacity and operating    X
characteristics (Table 104)
8.11.2.5 Verification of functionality at temperature extreme    X X
(50 °C)
a Verification of ability to carry rated current at    X
temperature extreme
– 14 – 60269-6 © IEC:2010
Test according to subclause Number of samples
b Conventional fusing current (I ) at temperature     X
f
extreme
Table 103 – Survey of tests on fuse-links of the smallest rated current
of a homogeneous series and number of fuse-links to be tested
Test according to subclause Number of samples
1 1 3 1 1
8.1.4 Dimensions X  X
8.1.5.1 Resistance X X X X X
8.11.2.4 Verification of freedom from unacceptable levels of X X X
thermally induced drift and of functionality at temperature
extremes
After 50 temperature cycles, but tested at ambient
temperature
8.4.3.1 Conventional non-fusing current (I)  X
nf
Conventional fusing current (I )  X
f
8.5 No. 1 Breaking capacity and operating  X
characteristics (Table 104)
8.11.2.5 Verification of functionality at temperature extreme  X X
(50 °C)
a Verification of ability to carry rated current at  X
temperature extreme
b Conventional fusing current (I ) at temperature   X
f
extreme
8.3 Verification of temperature rise limits and power dissipation
8.3.1 Arrangement of the fuse-link
The fuse-link shall be mounted vertically in the conventional test arrangement.
For special fuse-links that cannot be accommodated in the conventional test arrangement, or
for which this test arrangement is not applicable, special tests shall be performed according to
the manufacturer’s instructions and all pertinent data shall be recorded in the test report.
8.3.3 Measurement of power dissipation of the fuse-link
In addition to 8.3.3 of IEC 60269-1 the following applies.
The power dissipation test shall be made successively at least at 70 % and at 100 % of rated
current.
8.3.5 Acceptability of test results
The temperature rise of the fuse-link shall not exceed the values specified in Table 5 of
IEC 60269-1
The power dissipation of the fuse-link shall not exceed the values specified by the
manufacturer.
60269-6 © IEC:2010 – 15 –
8.4 Verification of operation
8.4.1 Arrangement of fuse-link
The arrangement of the fuse-link for the verification of operation shall be as described in 8.1.4
and 8.3.1.
8.4.3 Test method and acceptability of test results
8.4.3.1 Verification of conventional non-fusing and fusing current
It is permissible to make the following tests at a reduced voltage:
a) the fuse-link is subjected to its conventional non-fusing current (I ) for a time equal to the
nf
conventional time specified in Table 101. It shall not operate during this time;
b) the fuse-link, after having cooled down to ambient temperature, is subjected to the
conventional fusing current (I ). It shall operate within the conventional time as specified in
f
Table 101. The fuse-link shall operate without external effects or damage.
NOTE The tests in IEC 60269-6 are deemed to give satisfactory results for operation at 1,35 I within two hours in
n
typical applications. If this test arrangement is not applicable, special tests shall be performed according to the
manufacturer’s instructions and all pertinent data shall be recorded in the test report.
8.4.3.2 Verification of rated current
The test requested in 8.4.3.2 of IEC 60269-1 is replaced by the following.
Three samples are to undergo 3000 repetitions of current cycling where one cycle is
represented in Figure 101. None of the samples shall exhibit cracking or crazing of the fuse
body.
After this test, the resistance of the fuse-link at room temperature shall not have changed by
more than 10 %, and tests presented in 8.11.2.4 and Tables 102 and 103 shall be made.
8.4.3.5 Conventional cable overload protection test
Not applicable.
8.4.3.6 Operation of indicating devices and strikers, if any
The correct operation of indicating devices is verified in combination with the verification of
breaking capacity (see 8.5.5).
For verifying the operation of strikers, if any, an additional test sample shall be tested:
(see Table 104);
− at a current of I
− at a recovery voltage of 50 V.
The value of the recovery voltage may be exceeded by 10 %.
The striker shall operate during all tests.
8.5 Verification of the breaking capacity
8.5.1 Arrangement of the fuse
In addition to the conditions of 8.1.4 and 8.3.1, the following requirement applies.
For breaking-capacity tests, the fuse-link shall be mounted and connected the same way as it
would be in service.
– 16 – 60269-6 © IEC:2010
8.5.5 Test method
8.5.5.1 In order to verify that the fuse-link satisfies the conditions of 7.5, tests number – 1,
2 and 5 – shall be made. The number of fuse-links requested in Table 102 shall be tested with
the values stated in Table 104.
Test nos. 1 and 2 : If, during test no. 1, the requirements of test no. 2 are met, then this test
need not be repeated as test no. 2.
Test nos. 5 – The value of test current is specified in Table 104.
+5
8.5.5.2 For the tests the recovery voltage shall be maintained at a value of 100 % of the
rated voltage for at least:
– 30 s after operation of fuse-links not containing organic materials in their body or filler;
– 5 min after operation of the fuse-links in all other cases, switching over to another source
of supply being permitted after 15 s if the switching time (interval without voltage) does not
exceed 0,1 s.
In a lapse of time of at least 6 min and maximum 10 min after the operation, the resistance
between the contacts of the fuse-link shall be measured (see 8.5.8 of IEC 60269-1) and
noted. With the manufacturer’s consent, shorter times are possible if the fuse-link does not
contain organic materials in its body or filler.
8.5.8 Acceptability of test results
Fuse-links shall be deemed not to comply with this standard if, during the tests, one or more
of the following failures occur:
– ignition of the fuse-link, excluding any paper labels or the like used as indicating devices;
– mechanical damage to the test arrangement;
– mechanical damage to the fuse-link;
NOTE Thermal cracking which leaves the fuse-link in one piece is accepted.
– burning or melting of end caps;
– significant movement of end caps.
Table 104 – Values for breaking-capacity tests on “gPV” fuse-links
Tests according to 8.5.5.1
No. 1 No. 2 No. 5
+5
a
b
Mean value of recovery voltage
100  % of the rated voltage
I I I = 2 I
1 2 5 n
Prospective test current
+20
+10
Tolerance on current
Not applicable
% %
Inductance ≥
c 100 micro
Time constant 1 ms to 3 ms
Henry
I current which is used in the designation of the rated breaking capacity (see 5.7).
I current which shall be chosen in such a manner that the test is made under conditions
which approximate those giving maximum arc energy.
NOTE This condition may be deemed to be satisfied if the current, at the beginning of
arcing, has reached a value between 0,5 and 0,8 times the prospective current.

60269-6 © IEC:2010 – 17 –
I test current deemed to verify that the fuse is able to operate satisfactorily in the range of
small over-currents.
a
This tolerance includes ripple.
b
The upper limit may be exceeded with the manufacturer’s consent.
c
In some practical applications, time-constant values may be found which are shorter
than those indicated in the tests and which may result in a more favourable fuse
performance.
8.11 Mechanical and miscellaneous tests
8.11.2.4 Verification of freedom from unacceptable levels of thermally induced drift
Nine samples of each fuse-link having the largest rated current and five samples of each fuse-
link having the smallest rated current are each to be subjected to temperature cycling
consisting of 50 cycles of heating and cooling. Each cycle consisting of 15 min with the fuse-
link body maintained at -40 ± 5 °C followed by 15 min with the fuse-link body maintained at
90 ± 5 °C (any convenient ramp rate). At the conclusion of the 50 cycles, the samples shall be
returned to room temperature (25 ± 5 °C) for a minimum of 3 h.
At the conclusion of the temperature cycling, the samples of the fuse-link having the largest
rated current are to be subjected to the tests described as follows:
8.4.3.1 Conventional non-fusing current (I )
nf
Conventional fusing current (I )
f
8.5 No.1 Breaking capacity and operating characteristics (Table 104)
No.2 Breaking capacity and operating characteristics (Table 104)
No.5 Breaking capacity and operating characteristics (Table 104)
At the conclusion of the temperature cycling, the samples of the fuse-link having the smallest
rated current are to be subjected to the tests described as follow:
8.4.3.1 Conventional non-fusing current (I )
nf
Conventional fusing current (I )
f
8.5 No. 1 Breaking capacity and operating characteristics (Table 104)
See tables 102 and 103.
8.11.2.5 Verification of functionality at temperature extremes
a) One sample of each fuse-link having the largest rated current and one sample of each
fuse-link having the smallest rated current shall be subjected to a temperature of 50 ± 5 °C for
a period of 3 h or until temperatures stabilize. Each fuse-link shall be subjected to its rated
current (In) for a time equal to the conventional time specified in Table 101. It shall not
operate during this time.
b) One sample of each fuse-link having the largest rated current and one sample of each
fuse-link having the smallest rated current shall be subjected to a temperature of 50 ± 5 °C for
a period of 3 h or until temperatures stabilize. Each fuse-link shall be subjected to its
conventional fusing current (If). It shall operate within the conventional time as specified in
Table 101. The fuse link shall operate without external effects or damage.
See Tables 102 and 103.
– 18 – 60269-6 © IEC:2010
100 % †
75 % †
40 % †
15 % †
10 † 3 † 10 † 3 † 10 † 3 † 10 † 3 † 10 † 3 † 10 † 3 † t  (s)
One cycle
0 +2
100 % = (100   )% Time: 10 s = (10   )s
† Current:
–5  0
0  0
3 s = (3   )s
75 % = (75   )%
–5 –3
40 % = (40   )%
–5
15 % = (15   )%
–15
IEC  2160/10
Figure 101 – Current of test cycling

ln(A)
60269-6 © IEC:2010 – 19 –
Annex AA
(normative)
Examples of standardized fuse-links for the protection
of solar photovoltaic energy systems

AA.1 General
This annex is divided into four specific examples of standardised dimensions:
– system of fuse-links with cylindrical contact caps, type A – French (Figure AA.1 and Figure
AA.2)
– system of cylindrical fuse-links with blade contacts, type B – North American (Figure AA.3)
– system of fuse-links with blade contacts, type C – DIN (Figure AA.4)
– system of cylindrical fuse-links with long blade contacts, type D – DIN (Figure AA.5)
Fuse-links for the PV protection may also have the same dimensions as fuse-links according to
IEC 60269-2: systems of fuses A, F and H.
In addition to meeting the requirements of this standard, the power dissipation of the fuse-link
shall no
...