Branch Circuit Protection - Siemens SINAMICS G120C Compact Operating Instructions

3.2.2

Branch circuit protection

Danger to life due to electric shock and fire hazard caused by protective equipment tripping
too late
Overcurrent protective equipment that trips too late or not all can cause electric shock or
fire.
• In the case of a conductor-conductor or conductor-ground short-circuit, ensure that the
• You must additionally use a residual-current protective device (RCD) if, for a conductor-
• It is not permissible that the short-circuit current exceeds the short-circuit current rating
Branch circuit protection according to the IEC standard
Table 3- 3
Frame
size
FSD
FSE
FSF
Maximum rated current of the protection device.
1)
Minimum volume of the control cabinet in which the inverter is installed. The restriction applies only
2)
for a protection with a circuit-breaker.
SINAMICS G120C, FSD ... FSF inverters
Compact Operating Instructions, 11/2016, FW V4.7 SP6, A5E39339884B AA
WARNING
short-circuit current at the point where the inverter is connected to the line supply
corresponds as a minimum to the requirements of the protective equipment used.
ground short circuit, the required short-circuit current is not reached. Especially for TT
line systems, the required short-circuit can be too low.
(SCCR) of the inverter and the disconnecting capacity of the protective equipment.
Permissible protective equipment according to the IEC standard
Rated power Inverter article num-
ber
22 kW 6SL3210-1KE24-4...
30 kW 6SL3210-1KE26-0...
37 kW 6SL3210-1KE27-0...
45 kW 6SL3210-1KE28-4...
55 kW 6SL3210-1KE31-1...
75 kW 6SL3210-1KE31-4...
90 kW 6SL3210-1KE31-7...
110 kW 6SL3210-1KE32-1...
132 kW 6SL3210-1KE32-4...
Article number, fuse
3NA3824 3NE1820-0
3NA3830 3NE1021-0
3NA3830 3NE1021-0
3NA3832 3NE1022-0
3NA3836 3NE1224-0
3NA3140 3NE1225-0
3NA3142 3NE1277-0
3NA3250 3NE1230-0
3NA3252 3NE1331-0
Installing
3.2 Connecting
I Control
max 1)
cabinet
2)
80 ≥ 0.6 m³
100
100
125
160
200
250
315
350
21