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3.7 Fuse holder with fuse link (optional)
Figure 3.9 Fuse holder with fuse link
The fuse holders have a silver layer which ensures low
contact resistance and a long service life of the fuse links.
The fuse links with gPV fuses according to IEC 60269-
6:2010 protect the PV string cables against overcurrent.
The fuse links are equipped with silver-coated end caps for
the lowest possible contact resistance.
3.8 Surge protection according to DIN EN
50539-12
The use of the PV Next String Combiner Box as surge pro-
tection according to DIN EN 50539-12:2014 depends on
the distance between the PV generators and the inverter.
1
2
SPD
SPD
III
II
5
Figure 3.10 Surge protection in the PV system
1
Mains connection
2
Main distribution
3
PV inverter
4
PV generator
5
Earthing system
6
Additional earthing connection
2690250000/00/08.2019
3
4
SPD
SPD
I
IV
6
Outer light-
Separation
ning protec-
distance
S ≥ 0.7 ... 1.0 m
tion system
present
fulfilled
–
–
–
–
–
–
–
–
x
x
x
x
x
x
x
x
x
–
x
–
x
–
x
–
DIN EN 50539-12: Requirements for surge voltage arresters depending
on application
Observe the cross-sections of the functional
earth cable required in DIN EN 50539-12:2014:
Type II: minimum 6 mm
cross-section of the active conductor if this is
greater than 6 mm
Type I: minimum 16 mm
cross-section of the active conductor if this is
greater than 16 mm
Product description
Cable
In front of
Behind the
length
the inverter
PV generators
I2 < 10 m
–
Type II
x
Type II
–
Type II
x
–
Type II
x
Type II
–
Type II
x
–
x
Type I
Type I
–
x
or equal to the
2
.
2
or equal to the
2
.
2
–
–
–
–
33
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