The monitors show you the current. This one acts on it : when a circuit stays over your limit, the Arduino trips a relay to shed the load (or sounds an alert) — and it does it in its own loop, no Home...

The problem this solves The main breaker trips when the EV charger, the water heater and the workshop all pull at once. Or you want to cap a circuit — a rental outlet, a garage socket — so it can't ex...