when i was out last month, i stayed nearby at friends place in San Jose.
There too, the trip switch kept cutting out, like you said, we also had few appliances on, but nothing too much.
I'm not happy to hear that the same is happening at La Recoleta.
Surely if you needed a box to cater for higher voltage then the builders should have fitted one of that spec. that works with appliances on.
Pls let us know how you get on and i guess the electricity company will want to charge you for an upgrade.