4.5 DC fuse selection
The fuses on the DC-Input of the inverter must have
the following characteristics:
Fuse characteristics
Fuse type Min. voltage rating
DC current 1000 V
It is recommended to use gPV fuses, which are
developed for solar application, in order to protect
cables and panels against reverse over current, when
multiple strings are connected in parallel. See chapter
4.6 Manufacturers of gPV fuses for recommended
gPV fuse manufacturer.
The photovoltaic fuses have to meet the IEC 60269-6
or the UL 2579 standard.
The maximum I
SC
PV and inverter back-feed current
depend on the used DC fuses. Make sure that the
breaking capacity of the fuses is sufficient for the final
application. Also, local regulations must be taken into
account.
See the tables below for recommended fuse sizes.
Recommended fuse sizes, Mains voltage 3AC 208-240 V, 50/60 Hz, up to 400 V in V DC
Enclosure size AC drive type
Rated
continuous
current
[A]
IEC60269-6
Fuse size
[A]
UL-2579 Fuse
size
[A]
Total number of
fuses
A
0007 6.6 12 12 2
0008 8.0 15 15 2
0011 11.0 20 20 2
0012 12.5 20 25 2
B
0018 18.0 30 40 2
0024 24.0 40 50 2
0031 31.0 50 63 2
C
0048 48.0 80 100 2
0062 62.0 100 125 2
MR5
0018 18.0 30 40 2
0024 24.0 40 50 2
0031 31.0 50 63 2
MR6
0048 48.0 80 100 2
0062 62.0 100 125 2
MR7
0075 75.0 125 160 2
0088 88.0 160 200 2
0105 105.0 200 200 2
MR8
0140 140.0 250 315 2
0170 170.0 315 400 2
0205 205.0 400 400 2
MR9A
0261 261.0 500 500 2
0310 310.0 600 630 2
12
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