The fuses protect the lines upstream to the next protection device. That doesn’t mean every house could max out their breaker at the same time. Just like you can’t pull the max amperage on each circuit breaker in your panel without popping the mail breaker.
To answer your question, most American homes I’ve seen have 240V at 200A. Some older homes have 100A.






“You can go outside on a hot night and clap, but you won’t get your blood back”
Fair Game Samia