Installation
4.2 Electrical Installation
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
35
4.2.4
Feeder protection of individual inverters
If you install a separate 400-V feeder for each inverter, you must protect each feeder
individually.
Figure 4-5
Power supply to inverters through separate 400-V feeders
Feeder protection according to IEC
Table 4- 1
Feeder protection according to IEC
Rated power Power Module
Frame
size
Article No.
Max. rated
current of the
protection de-
vice
Fuse
Circuit-breaker
0.75 kW
6SL3525-0PE17-5AA1 FSA
3NA3803
3RV2011-1JA10
10 A
1.5 kW
6SL3525-0PE21-5AA1
3 kW
6SL3525-0PE23-0AA1 FSB
3NA3805
3RV2011-4AA10 16 A
4 kW
6SL3525-0PE24-0AA1 FSC
3NA3807
3RV2021-4BA10 20 A
5.5 kW
6SL3525-0PE25-5AA1
7.5 kW
6SL3525-0PE27-5AA1
3NA3812
3RV2021-4PA10 32 A
Feeder protection according to UL standards
Use in North America requires protection devices that meet UL standards as detailed in the
following tables.
Table 4- 2
Overview of the approved protection devices according to UL standards
Protection device
UL category
Fuses of any manufacturer with faster tripping characteristic than class RK5, e.g.
class J, time, CC, G, or CF
JDDZ
SIEMENS circuit breaker
DIVQ
Intrinsically safe SIEMENS circuit breaker
NKJH