The more I think about doing something like this, per the original post, I am going to reverse my thinking as to the "farm" approach.
Looking at this from a US standpoint where typical household mains are 120 volt (derived from 240 volt split phase) and the typical service outlets (wall outlets) are 15 or 20 amp service. You can buy a truckload of 15 or 20 amp circuit breakers for under $4.00 each. Lowes, Home Depot or any home improvement store will sell you all you could want. Just like the pages of them
that can be found here. However, when you want circuit breakers that are low current starting with .5 amp all bets are off and it is a new ball game. Now we get into breakers like
those found here. They average $20 a pop or more. Therefore if you want 10 EA for 10 current ranges figure on $200 plus. Hey, the bright side is they are DIN Rail mounted.
Constantly switching breakers in and out would also be a pain. Plus forgetting to switch one out when changing current ranges could be a mess in the happening. Something else to consider is when we get above 20 amps then we start looking at the wire gauges as well as plugs and sockets. You want 30 Amps? Then we have AWG 10, you want 40 Amps, now we get to AWG 8. Not to mention what the mains breaker is out there somewhere. There is no escaping the wire sizes needed.
Here in the US I would come in with a 20 Amp GFCI circuit breaker. I would monitor line current and voltage. I would monitor the current using a hall effect sensor and convert my 0 to 20 amps to 4 to 20 mA and run that through a 500 Ohm resistor giving me 0 to 20 amps scaled to 2 to 10 volts. I would build a simple comparator circuit with a measured and variable reference voltage. Use a scalable meter to monitor and set the reference so it displays your trip current. The output of the comparator drives a contactor. When a current exceeds the preset limit the contactor drops out and stays out requiring a manual reset. I would use a contactor rather SST to avoid the leakage current of a SSR.
Anyway, I would go about it something like that, give or take a few meters.
Ron