How to protect my home from high voltage?
Circuit breakers don't provide protection against over-voltage.  They might in extreme circumstances where over-voltage causes an over-current situation, but that protection occurs too late, after the electrical appliance is smoking.

What you really need is a power conditioner, also known as a voltage conditioner.  They are expensive even for small loads.  A whole-house conditioner might run $15,000.  But to target just a few appliances, there are some around $1,700.  See this and this.



If this is not a temporary power situation, you might consider a whole house standby generator.  The deluxe units switch to generator power not only when the voltage goes low, but also when it goes too high.