Siemens SIRIUS 3RA6 System Manual page 34

Application planning
4.3 Supply options (main circuit)
Only size S0 3RV2.2 circuit breakers may be mounted on the 45 mm adapter for the infeed
system for 3RA6. Interphase barriers must be mounted. If the short-circuit current at the
installation point exceeds the circuit breaker's specified rated service short-circuit breaking
capacity, you will need to use a backup fuse.
Short-circuit hazard!
The cables shall be arranged in such a manner that an internal short-circuit is not to be
expected. They shall be rated at least in accordance with the information concerning the
short-circuit
withstand strength (IEC 61439-1 Section 8.6.1) and designed to withstand at least the
short-circuit stresses limited by the protective device on the supply side of the infeed
system.
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WARNING
SIRIUS 3RA6 compact starter
System Manual, 08/2018, NEB560060102000/RS-AB/007