Mr. Wonderchi:
The transient analysis gives you the data to use for selection of the proper close and latch capability of the circuit breaker. Remember, circuit breakers not only interrupt faults, but they can also close on faults, or, selectively, let faults through. The initial asymmetrical values are at stake during closing (or holding during a let through). By the time relays react and the breaker mechanism operates, a minimum of 2 and a 1/2 cycles has elapsed and the fault current has decayed to something below the interrupting rating of the circuit breaker. The close and latch listed rating of a circuit breaker is usually higher than its interrupting rating. Therefore, it's prudent to check the definition of 'Imax' from the standard that applies (IEC, JEC, ANSI, ...)