IEC 60269-6:2010/AMD1:2021

IEC 60269-6 ®
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
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
IEC 60269-6:2010-09/AMD1:2021-04(en-fr)

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IEC 60269-6 ®
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
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
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-9631-8

– 2 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
FOREWORD
This amendment has been prepared by subcommittee 32B: Low-voltage fuses, of IEC
technical committee 32: Fuses.
The text of this amendment is based on the following documents:
FDIS Report on voting
32B/698/FDIS 32B/699/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 amendment and the base 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• withdrawn,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.
_____________
1.1 Scope and object
Replace the first two sentences of the Scope with the following new text:
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 DC, and also, in so far as they are
applicable, for circuits of higher nominal voltages.
1.2 Normative references
Delete the date and the footnote after the following reference:
IEC 60269-1
Add the following new references:
IEC 61386-1, Conduit systems for cable management – Part 1: General requirements
IEC 61730-2, Photovoltaic (PV) module safety qualification – Part 2: Requirements for testing
IEC 62548, Photovoltaic (PV) arrays – Design requirements
IEC 60364-7-712, Low voltage electrical installations – Part 7-712: Requirements for special
installations or locations – Solar photovoltaic (PV) power supply systems

© IEC 2021
2 Terms and definitions
2.2 General terms
Add, after the title of 2.2, the following new note:
NOTE Photovoltaic = PV.
2.2.101
Replace the existing title and text of 2.2.101 with the following new title and text:
2.2.101
PV fuse-link
2.2.101.1
PV fuse-link (general)
fuse-link capable of breaking, under specified conditions, any current value within the
breaking range
NOTE A PV fuse-link operates under two main conditions:
• Short-circuit in a string (see IEC 62548 and IEC 60634-7-712 or in an array or sub-array (see IEC 62548 and
IEC 60634-7-712) 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 condition
leads to a very high rate of rise of current equivalent to a low value of time constant, corresponding to
Table 104.
2.2.101.2
PV string fuse-link
fuse-link for the short-circuit and overload protection in a string
2.2.101.3
sub-array or array or array field fuse-link
fuse-link for the short-circuit and cable overload protection in an sub-array or array or array
field
2.2.101.4
functional earthing fuse-link
fuse-link for earthing circuit protection of the photovoltaic (or PV) arrays. Functional earthing
fuse-link arrangement can be found in IEC 60364-7-712 and IEC 62548
2.2.102
Delete existing Subclause 2.2.102.
2.2.103
Delete existing Subclause 2.2.103.
2.2.104
Delete the words “array field, assembly, generator, panel” from the text of Subclause 2.2.104
and renumber 2.2.104 to 2.2.102 and 2.104.1 to 2.2.102.1
Delete Subclauses 2.2.104.2, 2.2.104.3, 2.2.104.4 and 2.2.104.5.
Renumber 2.2.104.6 as 2.2.102.2 and 2.2.104.7 as 2.2.102.3.
2.2.105
Delete Subclause 2.2.105.
– 4 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
2.2.106
Delete Subclause 2.2.106.
2.2.107
Renumber 2.2.107 as 2.2.102.4.
2.2.108
Renumber 2.2.108 as 2.2.102.5.
2.2.109
Renumber 2.2.109 as 2.2.103 and replace the existing text with the following new text:
2.2.103
currents
2.2.103.1
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 or close to zero
2.2.103.2
maximum overcurrent rating
I
MOD_MAX_OCPR
PV module maximum overcurrent protection rating determined by IEC 61730-2
2.2.103.3
short circuit current of a PV module
I
SC MOD
short circuit current of a PV module or PV string at standard test conditions (STC), as
specified by the manufacturer
2.2.103.4
short circuit current of an array
I
SC ARRAY
short-circuit current of the PV array at standard test conditions (STC), which is equal to
I = I × N where N is the total number of parallel-connected PV strings in the
SC ARRAY SC MOD S S
PV array
NOTE 1 A PV string is a number of PV modules connected in series. The short circuit current of a string is equal
to I .
SC,MOD
2.2.103.5
short circuit current of an sub-array
I
SC S-ARRAY
short circuit current of a PV sub-array at standard test conditions (STC), which is equal to
I = I × N where N is the number of parallel-connected PV strings in the
SC S-ARRAY SC MOD SA SA
PV sub-array
2.2.103.6
maximum reverse current of an array
(symbol I ) (unit: A)
RM
maximum reverse current accepted by the module or the panel
2.2.110
Renumber 2.2.110 as 2.2.104.
© IEC 2021
Replace, in the title of 2.2.110, "photovoltaic" by "PV".
Delete Subclauses 2.2.110.1, 2.2.110.2, 2.2.110.3 and 2.2.110.4.
Renumber 2.2.110.5 as 2.2.104.1 and replace "output electrical current" by "load current".
Renumber 2.2.110.6 as 2.2.104.2.
Delete Subclause 2.2.110.7.
Table 101 – Conventional times and currents for “gPV” fuse-links

Replace existing Table 101 with the following new table:
Table 101 – Conventional times and currents for "gPV" fuse-links
Conventional current
Rated current Conventional time Type "gPV" Fuse type
A h I I
nf f
1 1,05 -
I ≤ 63 String fuse-link
n
1)
2 - 1,35
63 < I ≤ 160 2
n
* *
160 < I ≤ 400 3 1,13 1,45 Subarray or Array fuse-link
n
400 < I 4
n
1)
NOTE For I = 1,35 I the operating time is 2 h (The thermal withstand capability of a PV module under
f n
reverse current is qualified during a 2 h test specified in module safety test from IEC 61730 and is specified on
the module as the "maximum overcurrent protection" value).
*
The use of these values for conventional currents is not permitted in North America. String fuse-link
conventional current values are permitted for sub-array and array fuse-links

8.3.3 Measurement of power dissipation of the fuse-link
Add the following new sentence at the end of the second paragraph of 8.3.3:
This test maybe performed with either alternating or direct current.
8.4.3.1 Verification of conventional non-fusing and fusing current
Replace the existing first sentence of 8.4.3.1 with the following new sentence:
It is permissible to make the following tests at a reduced voltage and either alternating or
direct current.
Replace existing bullet point b) with the following new text:
b) The fuse-link is subjected to the conventional fusing current. It shall operate within the
conventional time (Table 101). For string fuse-links it is also acceptable when I = 1,35 In
f
when the fuse link operates within t = 2 hours as specified in Table 101, Note 2. The
c
fuse-link shall operate without external effects or damage.
NOTE 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.

– 6 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
8.4.3.2 Verification of rated current
Replace the existing text of 8.4.3.2 with the following new text:
The test requested in 8.4.3.2 of IEC 60269-1:2006 is replaced by the following. The
requirements for safe operation apply from IEC 60 269-1, 8.5.8:2006.
The tests may be performed with either alternating or direct current at reduced voltage.
a) String fuse-links:
Rated current ≤ 63 A: Three samples are to undergo 3 000 repetitions of current cycling
where one cycle is represented in Figure 101. None of the samples shall exhibit cracking
of the fuse body. This test maybe performed with either alternating or direct current.
After this test, the resistance of the fuse-link at room temperature shall not have changed
by more than 10 %, and then tests presented in 8.11.2.4 and Tables 102 and 103 shall be
made.
b) Sub array and Array fuse-links, rated current > 63 A (these fuse-links protect cables):
The test required in 8.4.3.2 of IEC 60269-1:2006 is applicable with the following
modifications:
One fuse-link is submitted to a pulse test for 100 h, in which the fuse-link will be cyclically
loaded. Each cycle with an on-period of the conventional time and an off-period of 0,1 of
the conventional time, the test current being equal to 0,85 of the rated current of the
fuse-link.
After the test the fuse-link shall not have changed its characteristics. Verification shall be
carried out by the test as described in item a) of 8.4.3.1.
This test may be performed with either alternating or direct current.

Table 104 – Values for breaking capacity tests on “gPV” fiuse-links
Replace the existing text of the cell concerning time constant for test No.5 with the following
new text:
≤ 1 ms
© IEC 2021
Figure 101 – Current of test cycling
Replace existing Figure 101 with the following new Figure 101:

Annex AA – Examples of standardized fuse-links for the protection of solar
photovoltaic energy systems
AA.1 General
Delete the words “French”, “North American” and “DIN” after the bullet points for systems type
A, type B and type C.
Replace the existing fourth bullet point with the following new text:
– system of long fuse-links with blade contacts, type D (Figure AA.5)
Add, after the fourth bullet point, the following new text:
– Replacement handle for fuse links type D – Figure AA.6
– Examples of fuse bases to AA.5 (long fuse links with blade contacts) – Figure AA.7
– System of long fuse links with bolted contacts – Figure AA.7
Replace the last two paragraphs of Clause AA.1 with the following new text:
In addition to making these requirements of this standard, the power dissipation of the fuse-
link shall not exceed the acceptable power acceptance of the associated fuse-bases or fuse-
holders.
– 8 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
Where the power dissipation of the fuse link exceeds the acceptable power acceptance of the
standardised fuse-base or fuse-holder, de-rating values shall be given by the manufacturer.
Figure AA.1 – Fuse-links with cylindrical contact caps, type A
Replace the existing table in the key to Figure AA.1 with the following new table:
Size a b c d r
max min
10 × 38 38+0,9/-0,6 10,5 10,3+/-0,1 6 1,5+/-0,5
3)
14 × 51 51+0,6/-1 13,8 14,3+/-0,1 7,5 2+/-1
10 × 85 85+/-1,2 10,5 10,3+/-0,1 6 1,5+/-0,5
3)
20 × 127 127+/-2 16,2 20,6+/-0,2 10,8 2+/-1
3)
22 × 127 127+/-2 16,2 22,2+/-0,2 11 2+/-1
27 × 140 140+/-2 16,2 27,0+/-0,2 15,9 2+/-1

AA.3 North American cylindrical fuse-links with blade contacts, type B
(specific for PV application)
Replace the existing title of Clause AA.3 with the following new title:
AA.3 Cylindrical fuse-links with blade contacts, type B (specific for PV
application)
Figure AA.3 – North American cylindrical fuse-links with blade contacts – Sizes
61-600 A
Replace the existing title of Figure AA.3 with the following new title:
Figure AA.3 – Cylindrical fuse-links with blade contacts – Sizes 61-600 A

© IEC 2021
AA.4 Fuse-links with blade contacts, type C, C referring IEC 60269-2 "Fuse
sysstem A (NH fuse system)"
Figure AA.4 – Fuse-links with blade contacts, type C, C referring IEC 60269-2 "Fuse
system A (NH fuse system)"
Replace existing Figure AA.4 with the following new Figure AA.4:

Key
A indicating device (see )
B contact
C endplate
D stop face
E detail Y (sectional view)
F rounded ( see )
G contact face
Size a a a a b b b b c c d e e e e f z

1 2 3 4 1 2 3 4 1 2 1 2 3 4
min. min. max. min. max. max. max. max.
±0,8 ±0,2
1) 2) 1) 1) 11) 11) 11) 11) 5) 6) 6)
1 135 75 62 68 20 5 6 17 40 11 2,5 53 52 20 6 15 5

+1,5
±2,5 –10 ±2,5 ±2,5 –2
−0,5
2 150 75 62 68 25 8 6 22 48 11 2,5 61 60 20 6 15 5

+1,5
–10 –2
±2,5 ±2,5 ±2,5
−0,5
3 150 75 62 68 32 11 6 29 60 11 2,5 76 75 20 6 18 5

–10 –2
±2,5 ±2,5 ±2,5
– 10 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
+1,5
−0,5
Dimensions in millimeters
1) The centres of the dimensions a , a and a shall not deviate from the centre of a by more than 1,5 mm.
1 3 4 2
2) The dimension a shall be observed within the total area of the stop faces (b × 4 min.) on both sides of the
2 2
blades. Outside of these areas the maximum dimension a applies.
3) Insulating material.
4) The blade contacts shall be axially aligned and contact surfaces shall be plane.
5) Attachment for replacement handle (detail X).
6) Maximum dimensions of the enclosure of the fuse-link. Within these limits, the fuse-links may be of any form,
for example, square, rectangular, circular, oval, polygonal, etc.
8) Indicating device. Position of the indicating device as chosen by the manufacturer.
9) Live parts, gripping-lugs can be insulated.
10) With the exception of the attachment for the replacement handle (detail X), the endplates are not permitted to
protrude radially from the insulation body.
11) As far as overlapping of rated currents exists within the sizes 1, 2 and 3 the dimension of the smaller size is
permitted.
12) All corners shall be rounded to prevent damage to the contact surface of the base contacts.

© IEC 2021
AA.5 Fuse-links with long blade contacts, type D (specific for PV application)
Figure AA.5 – Fuse-links with long blade contacts, type D
Replace existing Figure AA.5 and its title with the following new Figure AA.5 and title:

Key
a a a a b b b b c c d e e e e f z

1 2 3 4 1 2 3 4 1 2 1 2 3 4
Size   min. min. max. min. max. max. max. max.
±0,8 ±0,2
1) 2) 1) 1) 11) 11) 11) 11) 5) 6) 6)
1L 170 112 102 108 20 5 6 17 40 11 2,5 53 52 20 +5  6 16.5 5
-2
+1,5
–10 –2
±3 ±3
−0,5
±3
1XL 189 133 120 127 20 5 6 17 40 11 2,5 53 52 20 +5  6 16.5 5
-2
+1,5
±5 –10 ±3 –2
−0,5
±3
2L 185 112 102 108 25 8 6 22 48 11 2,5 61 60 20 +5  6 16.5 5
-2
+1,5
±3 –10 ±3 –2
±3 −0,5
2XL 205 130 117 123 25 8 6 22 48 11 2,5 61 60 20 +5  6 16.5 5
-2
+1,5
–10 –2
±3 ±3
−0,5
±3
– 12 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
205 130 117 123 11 2,5 20 +5
3L 32 11 6 29 60 76 75 6 18 5
–10  -2
+1,5
±3 ±3 ±3 –2
−0,5
1) The centres of the dimensions a , a and a shall not deviate from the centre of a by more than 1,5 mm.
1 3 4 2
2) The dimension a shall be observed within the total area of the stop faces (b × 4 min.) on both sides of the
blades. Outside of these areas the maximum dimension a applies.
3) Insulating material.
4) The blade contacts shall be axially aligned and contact surfaces shall be plane.
5) Attachment for replacement handle (detail X).
6) Maximum dimensions of the enclosure of the fuse-link. Within these limits, the fuse-links may be of any form,
for example, square, rectangular, circular, oval, polygonal, etc.
8) Indicating device. Position of the indicating device as chosen by the manufacturer.
9) Live parts, gripping-lugs can be insulated.
10) With the exception of the attachment for the replacement handle (detail X), the end plates are not permitted to
protrude radially from the insulation body.

11) As far as overlapping of rated currents exists within the sizes 1L, 1XL, 2L, 2XL, and 3L the dimension of the
smaller size is permitted.
12) All corners shall be rounded to prevent damage to the contact surface of the base contacts.
Figure AA.5 – Long fuse-links with blade contacts,
type D (specific for PV application)

© IEC 2021
Add, at the end of Clause AA.5, the following new figure:
Dimensions in millimetres
Distance
Size L M-M3 M-M4
1 L/2 L 16 0 ±6 –
1 XL/2 XL/3L 16 – 9,5 ±6
Centre of the set-in and blocked-up fuse-link:
M3 For the sizes 1 L/2 L
M4 For the sizes 1 XL/2 XL/3 L
M Centre of coupling
L Permitted lift for setting in and taking out the fuse-link
NOTE The basic position of the fuse-link for measurements of the handle is defined by the manufacturer.
Exclusive handles for sizes 1L, 2L and / or for sizes 1XL, 2XL, 3L can be defined here.
Figure AA.6 – Replacement handle for long fuse-links with blade contacts

– 14 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
Add the following new subclauses at the end of Annex AA:
AA.6 Fuse-links with bolted contacts, type E (specific for PV application)

Key
A Partition wall
B See note 1)
C Contacts
D Contact surface, see note 5)
Size g h n n P P r s t v w w x y s
1 2 1 2 1 2
7) 7) 7)
±1 ±5 max. max. max. ±1,5 min. max. min. min. max.
8) 7) 7)
1 L 53 215 52 60 55 35 17 38 21 117±3 30±0,7 25±0,7 20   +1 38
10,5 –0,5
1 XL 53 233 52 60 55 35 17 38 21 135±5 30±0,7 25±0,7 20   +1 38
10,5 –0,5
2 L 61 240 60 68 60 35 17 46 27 117±3 30±0,7 25±0,7 20   +1 38
10,5 –0,5
2 XL 61 258 60 68 60 35 17 46 27 135±5 30±0,7 25±0,7 20   +1 38
10,5 –0,5
3 L 73 268 75 83 68 35 20 58 33 135±5 30±0,7 25±0,7 20   +1 38
10,5 –0,5
1)
This area is considered to be live.
2)
The maximum value of dimension v is intended to define a point of contact. It shall at least be observed at one
point of contact within the two areas b × 4 min. of the fuse-link. Dimension v may also be met by means of
insulating contact covers.
3)
Height of contact surface. It shall also be possible to insert fuse-links with blade contacts according to
Figure 101, even if the contact surface is not smooth but grooved or divided.
4)
Dimensions for size 4. Fixing bolts are mandatory for size 4; M12 when threaded.
5)
Resilient contact surface, except for size 4. Contact force by auxiliary means.
6)
Only to be used with swivel unit having an interlocking device.
7)
These values are only mandatory if interchangeability of fuse-bases is required.
8)
When constructing multiple or assemblies of single-pole fuse-bases, it is necessary, for reasons of safety, to fit
insulating barriers (for example, partition walls with recommended dimension “g") compatible with the maximum
dimension prescribed for n .
t
Figure AA.7 – Fuse-bases for long fuse-links with blade contacts

© IEC 2021
Notes:
a) Blade contacts shall be axially aligned and contact surfaces shall be plane.
b) Attachment for the replacement handle (detail X) , if fitte
...