Installation vacon • 13
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3.4 DC Fuse selection
The fuses on the DC-Input of the inverter must have the following characteristics:
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 3.5. 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:
Table 5. Fuse characteristics
Fuse type Min. Voltage rating
DC current 1000 V
Table 6. 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
MM4
0007 6.6 12 12 2
0008 8.0 15 15 2
0011 11.0 20 20 2
0012 12.5 20 25 2
MM5
0018 18.0 30 40 2
0024 24.0 40 50 2
0031 31.0 50 63 2
MM6
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
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