Fronius 3.0-3-S - Criteria for Selecting the Right String Fuses

13
EN
As an option, the inverter can be supplied with the following fuses:
- 6 x 15 A string fuses on the DC+ input and 6 x metal pins on the DC- input
- 12 x metal pins
Criteria for select-
ing the right
string fuses
The following criteria must be met for each solar module string when selecting suitable fus-
es:
-I
N
> 1.8 x I
SC
-I
N
< 2.4 x I
SC
-U
N
>/= max. input voltage of the inverter used
- Fuse dimensions: diameter 10 x 38 mm
I
N
Nominal current of fuse
I
SC
Short circuit current for standard test conditions (STC) according to the solar mod-
ule data sheet
U
N
Rated voltage of fuse
NOTE! To avoid the risk of a fire, only replace faulty fuses with new ones of the
same rating.
Option DC OVP
DC+ 2.1
DC+ 1.1
DC+ 1.3
DC+ 1.2
DC+ 2.3
DC+ 2.2
DC- 1.2
DC- 1.1
DC- 1.3 DC- 2.1
DC- 2.2 DC- 2.3
Do not remove cover!
Do not remove cover!
Each Terminal: I
Each Terminal: I
max
max
= I
= I
SC
SC
< 12 A
< 12 A
NOTE! The nominal current rating of the fuse must not exceed the maximum fuse
protection specified in the data sheet supplied by the solar module manufacturer.
If a maximum fuse protection is not specified, then this information must be re-
quested from the solar module manufacturer.