Surge protection is designed to reduce the random energy surges of voltage. While lightning strikes are commonly associated with power (voltage) surges, other sources include downed power lines and major appliances like your air conditioner cycling on & off.
Individual “plug-in” surge protectors (picture on the left) can’t provide complete protection for everything in your house. They do however provide protection to those items which are plugged into it. They are however rated for their protection, that is not every surge protector power bar is the same. They come in varying sizes (rated in “joules”) protection. So, generally, the larger the joules the more protection it affords you. They don’t last forever and may need replacement especially if subjected to repeated surges or enough larger surges. Whole house surge protection (picture on the right) guards all your electrical devices in the home e.g. electronic equipment, household appliances, telephone & cable TV against big power spikes.
These surge suppression devices act as pressure relief valves to divert excess voltage. Whole-house suppressors are hard-wired to the service panel by a licensed electrician, however they can’t stop all surges. So a second layer of protection using “plug-in” devices doesn’t hurt.
Be prepared when the next electrical surge hits your home.