Switchgear Safety: Is 53 kA vs 40 kA Safe?

[electroboy]

dear all

i just want to ask about, switchgear that according to the calculation of short circuit currents have Isc 53 kA, but the circuit breaker that used has a Isc 40 kA , whether this condition safe for my system?

thank you.

 

[m.s.j]

No,If actual fault current level is 53 KA, that chosen is not safe, but if the rating of chosen standard switchgear is 53 KA and estimated maximum fault current is less than 43 KA, it can be safe exclusively.

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