Criteria For The Proper Selection Of String Fuses - Fronius Symo 10.0-3 208-240 Manual De Instrucciones

specification of the maximum string fuse value in the module data sheet of the respective
solar module are decisive factors in the protection of the solar module.
The maximum short circuit current I
The string fuse release current can be set to greater than 12 A if required.
If the inverter is being operated with an external string collection box, the DC connector kit
(item numbers 42,0201,4479 and 42,0201,4480) must be used. In this case the solar mod-
ules are externally protected in the string collection box and the metal bolts should be used
in the inverter.
National regulations regarding fuse protection must be observed. The electrician perform-
ing the installation is responsible for choosing the right string fuses.
The inverter is delivered with metal bolts as standard.
DC+ 1.3
DC+ 1.2
Criteria for the The following criteria must be met for each solar module string when using fuse protection:
Proper Selection -
of String Fuses -
-
-
I
N
I
SC
V
N
NOTE! To prevent a risk of fire, faulty fuses must only be replaced by new equiv-
alent fuses.
Option DC OVP
DC+ 2.1
Do not remove cover! Do not remove cover!
DC+ 1.1
I > 1.8 x I
N SC
I < 2.4 x I
N SC
U >/= max. input voltage of inverter being used
N
Fuse dimensions: Diameter 10 x 38 mm
Nominal current of the fuse
Short circuit current for standard test conditions (STC) according to solar module
data sheet
Nominal voltage of the fuse
NOTE! The nominal current value of the fuse must not exceed the maximum fuse
protection value specified in the solar module manufacturer's data sheet. If a max-
imum fuse protection value is not specified, please request it from the solar mod-
ule manufacturer.
per terminal is 12 A.
SC
DC+ 2.3 DC- 1.2
DC+ 2.2 DC- 1.1
Each Terminal: I Each Terminal: I = I = I
max max SC SC
< 12 A < 12 A
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