Criteria For The Proper Selection Of String Fuses; General; Effects Of Using Underrated Fuses; Fuse Recommendations - Fronius String Control 250/25 DCD DF Bedienungsanleitung

Criteria for the Proper Selection of String Fuses

General

The use of string fuses in the Fronius String Control 250/25 DCD DF also
adds fuse protection to the solar modules.
A crucial factor for the fuse protection of solar modules is the maximum
short circuit current I
Criteria for the The following criteria must be fulfilled for each solar module string when
Proper Selec- using fuse protection:
tion of String -
Fuses -
-
-
I ......... Nominal current rating of fuse
N
I
SC
V
N
Effects of If a fuse is underrated, the nominal current value of the fuse can be less
Using Under- than the short circuit current of the solar module.
rated Fuses Effect:
The fuse may blow under intensive lighting conditions.
Fuse Recom-
mendations
You should only use the following fuses, which have been tested by Froni-
us, to ensure problem-free fuse protection:
-
Fronius shall not be liable for any damage or other incidents resulting
from the use of other fuses. In addition, all warranty claims are forfeited.
of the respective solar module.
SC
I > 1.8 x I
N SC
I < 2.4 x I
N SC
V >/= max. input voltage of inverter being used:
N
FRONIUS CL 36.0 / 48.0 / 60.0 ........... 600 V DC
Fuse dimensions: Diameter 10 x 38 mm
....... Short circuit current for standard test conditions (STC) according
to solar module data sheet
....... Nominal voltage rating of fuse
NOTE The nominal current value of the fuse must not exceed the
maximum fuse protection value specified in the solar module
manufacturer's datasheet. If a maximum fuse protection value is
not specified, please request it from the solar module manufactu-
rer.
NOTE Only select fuses whose nominal voltage is higher or
equal to the max. input voltage of the inverter being used.
Littelfuse KLKD fuses
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