If the current provision is smaller than MCBs current?

[Andrew81]

In Cyprus the supplier gives you 30A-3phase 415v.

The electrical designers put 32a mcb for ring sockets and 40A mcb for the floor.

For some time ( not instantneous), the load in the ring or in the floor requires more than 30A.

Which one will trip first the fuse of the supplier or the 32A MCB of the ring socket?
Which one will trip first the fuse of the supplier or the 40A MCB of the floor?

 

[plugwash]

could be either, when protective devices are that close in rating it is pretty hard to predict which will go first.