So you mean individual circuit is to have dedicated power outlet in the wall, one RCBO per outlet? Maybe at home this is possible to do. But at work or another home where you can't modify the main distribution board how to be? Any idea?RCBOs are used to give earth leakage protection to individual circuits. They combine over current and earth leakage protection.
If one trips then you only lose that circuit, not the whole system.
I have an idea - to build Arduino controled relay - 3 relays, phase, neutral and earth. The current sensor is measuring and comparing the current - if phase and neutral are equal - then OK, but if is detected very small leakage to earth, then the microcontroller shuts off all 3 relays. The Arduino processor and the Relay it is enough fast to perform this operation faster than regular RCBO on the market?