Fronius String Control 250/ 25 DCD DF, Operating Instructions Manual

Page: 78 / 197

20
Nominal current value Fuse
4.0 A KLK D 4
5.0 A KLK D 5
6.0 A KLK D 6
7.0 A KLK D 7
8.0 A KLK D 8
Fuses
„Fuses“ Table: Excerpt of Suitable Fuses, e.g., Littelfuse Fuses
Nominal current value Fuse
9.0 A KLK D 9
10.0 A KLK D 10
12.0 A KLK D 12
15.0 A KLK D 15
20.0 A KLK D 20
Example: Maximum short circuit current (I
SC
) of the solar module = 5.75 A
According to the criteria for selecting the correct fuse, the fuse must have
a nominal current greater than 1.8 times and less than 2.4 times the short
circuit current:
-
5.75 A x 1.8 = 10.35 A
- 5.75 A x 2.4 = 13.8 A
The fuse that should be selected according to the ‘Fuses’ table: KLK D12
with 12.0 A nominal current and 600 V AC/DC nominal voltage.
Application
Example