How do I protect my mining rig from brownouts and electrical surges?
You need whats called a Power Filter.

There are varying levels of filters, some cut the tops off of AC signals, others take dirty input current and consume it, then create a completely new AC signal for device use.

The C2 is a good intro, but if you want superior protection, look for something called a Power Conditioner.

Here are links to the current leading brand:
http://www.google.com/search?hl=en&amp;tbm=shop&amp;q=apc+power+filter

http://www.apc.com/products/category.cfm?id=15&amp;subid=85