Siemens SIRIUS 3RA6 System Manual page 33

Distance from neighboring components
For additional information on clearances to the neighboring components, please refer
to "Minimum distances from neighboring components (dimensions in mm) (Page 262)".
The installation guidelines for compact starters and circuit breakers/fuseless load feeders
must also be observed along with the associated clearances.
Short-circuit protection for SIRIUS infeed system for 3RA6
The short-circuit protection device that is installed upstream of the infeed system must be
designed in accordance with the table below.
Table 4- 5 Short-circuit protection for left or right infeed, 25/35 mm², with spring-loaded connection technology (3RA6830-
5AC)
Conductor cross Maximum let-
sections through
current I
4 mm ≤ 9.5 kA
2
6 mm ≤ 12.5 kA
2
10 mm ≤ 15 kA
2
16 mm / 25 mm ≤ 19 kA
2 2
35 mm² ≤ 21 kA
Short-circuit protection for infeed 3RA681.-8A.
Recommendation for upstream short-circuit protection device (50 kA/400 V AC):
3RV2041-4MA10 NH gG 3NA3; 315 A
Table 4- 6
Conductor cross-sections
Short-circuit protection for terminal block (3RV2917-5D)
1.5 mm
2.5 mm
4 mm
6 mm
SIRIUS 3RA6 compact starter
System Manual, 08/2018, NEB560060102000/RS-AB/007
Integral of current I²t
d,max
85 kA s
2
140 kA s
2
180 kA s
2
440 kA s
2
530 kA²s
Short-circuit protection for terminal block (3RV2917-5D)
Maximum let-through current I
protection device
I
2
d,max
I
2
d,max
I
2
d,max
I
2
d,max
Recommendation for
upstream short-circuit
protection device
3RV2021-4DA10
3RV2031-4EA10
3RV2031-4WA10
3RV2031-4JA10
3RV2041-4JA10
3RV2041-4MA10
NH gG 3NA3; 315 A
d,max
< 7.5 kA
< 9.5 kA
< 9.5 kA
< 12.5 kA
Application planning
4.3 Supply options (main circuit)
Maximum
prospective short-
circuit current I
40 kA
30 kA
25 kA
65 kA
65 kA
50 kA
for downstream short-circuit
KS
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