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
