If I add a precharge circuit to this, could I use a type B mcb I guess the capacitors have a large inrush which might trigger the type b mcb but when charged you would have better protection with a type b than a type c? I have some adjustable time delay relays (0-30mins) 10amp I could use so the precharge circuit always comes on say 1 minute before the PSU powers on.

If so how the hell do I make one I read something about precharge resistors but have no idea where to start.