User Documentation

Product description
2690250000/03/09.202036
3.8 Fuse holder with fuse link (optional)
Figure 3.9 Fuse holder with fuse link
Each fuse holder is covered with a silver layer and supplied
with a spring. This ensures a long life contact between the
fuse link and the fuse holder.
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.
3.9 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.
SPD
SPD
SPDSPD
I IVIIIII
1 2 3 4
5
6
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
Outer light-
ning protec-
tion system
present
Separation
distance
S ≥ 0.7 … 1.0 m
fulfilled
Cable
length
I2 < 10 m
In front of
the inverter
Behind the
PV generators
– – –
Type II
Type II
– – x –
– – – Type II
– – x –
x x –
Type II
Type II
x x x –
x x – Type II
x x x –
x – –
Type I Type I
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
2
or equal to the
cross-section of the active conductor if this is
greater than 6 mm
2
.
Type I: minimum 16 mm
2
or equal to the
cross-section of the active conductor if this is
greater than 16 mm
2
.
3.10 Regarding the LPL
Choose the products in a way that they meet the
lightening protection level (LPL) at the installation
site.
Please ask your building insurance company for
the appropriate LPL.
LPL 10/350 µs 8/20 µs
LPL I I
imp
≥ 5 kA, I
total
≥ 10 kA I
n
≥ 10 kA, I
total
≥ 20 kA
LPL II I
imp
≥ 3,75 kA, I
total
≥ 7,5 kA I
n
≥ 7,5 kA, I
total
≥ 15 kA
LPL IIi/iV I
imp
≥ 2,5 kA, I
total
≥ 5 kA I
n
≥ 5 kA, I
total
≥ 10 kA