Hello ! I equipped an old electric panel with some new MCB's. I used 25A and 2 poles (2p) on the general, 1 pole and neutral (1p+N) for the rest of the panel: 4x 16A and 4x 10A for electrical outlets circuits and 3x 6A on the light bulbs circuits. All of them C curve.
The earth arrangement is TNC.
The mcb's that I used are Schneider Electric Easy9. I fed the mcb's from the bottom side and at the top side I connected the circuits.
I made the following tests: I used a 4kW consumer at an C10 mcb and the mcb triggered in about a few seconds.
The second test was to make a direct short circuit on the C10 mcb outlet, but instead of triggering only the C10 mcb, it also triggered the C25 mcb (the general 2p mcb). It is normal to trigger the 25A mcb instead of triggering only the C10 mcb ?