Correct Connection Order for Main Circuit Breaker, Differentials

Hello and welcome. I am asking you for help because I have no such knowledge.

I have a very serious question (at least for me), because I'm looking for an answer everywhere: on the internet, I talked to "electricians" (probably pseudo) and I can't get a specific answer, everyone says something different.

Well, what should be the order of connections of the following devices?:
- main circuit breaker
- differentials
- surge protectors
What should come first? main circuit breaker, overvoltage and then differential or in a different order?

Parameters of my electrical installation: three-phase current, connection 16kW
(if you could also specify what parameters the above devices should have, it will be full of happiness )

Main switch disconnector FR then overvoltage protector (depending on B+C or C) then RCD apparatus followed by overcurrent

As a friend wrote more precisely:

Main switch - as the name says, it is to be the main (first) protection;

surge protectors

then there may be signaling of the presence of phases

residual current device and it is important that there is an overcurrent device behind each

As for the parameters of these devices, each building has connection conditions and is selected in accordance with the calculations, so take a look at the appropriate paper and read it if you do not have one, you are the wrong person who asks about them.

piotr_krak wrote:

surge protectors

Sometimes they need backup.

And I will say that first there was overvoltage protection (especially since the protector is connected in parallel with the disconnector) then the FR followed by the RCD and only the overcurrent