Siemens SINAMICS G120D - Page 50

Installation
4.2 Electrical Installation
Converter with control units CU250D-2
50 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
If no other restrictions apply, then select the power bus fusing according to the following
table.
Table 4- 12 Maximum fusing of the power bus
Rated power of the smallest inverter
connected to the power bus
Maximum permissible fusing
1
Circuit-breaker
0.75 kW
32 A
3NA3812
3RV1031-4FA10
1.5 kW
32 A
3NA3812
3RV1031-4FA10
3 kW
32 A
3NA3812
3RV1031-4FA10
4 kW
35 A
3NA3814
3RV1031-4FA10
5.5 kW
45 A
3NA3820
3RV1031-4HA10
7.5 kW
63 A
3NA3822
3RV1041-4KA10
1
The values do not apply to installations conforming to UL specifications.
Example
Figure 4-15 Fusing several inverters connected to a power bus
The maximum permissible fusing of 32 A is based on the inverter with the lowest rated
power of 3 kW.
If the inverters are never simultaneously in operation, then also lower cable cross-sections
are permissible and smaller fuses are required.