So your customer wants a whole house surge protector which will shut off power if "X" happens.
What is "X"?
Failure of surge protector?
Surge is above a certain value?
Difference between voltages of phases?
Over voltage? Under voltage?
In the industrial control world there are devices that have contacts that operate when certain conditions are met. For example, under/over voltage relays and TVS units that signal when a module has failed.
Do they want the power to be switched off and stay off? That could lead to some unpleasant consequences. Flooded basements, frozen pipes, thawed freezer, warm refrigerator, triggered alarm systems, etc.
You might want to go back to the customer and find out exactly what they are trying to protect. Point of use protection might make more sense.
Another Larry
