Surge Protectors vs. Power Strips: What You Need to Know

Many people assume that any power strip with multiple outlets protects their electronics from power surges. This is a common and potentially costly misunderstanding. A basic power strip is nothing more than a way to add more outlets to a wall — it offers no protection at all against electrical surges. A surge protector, on the other hand, is designed to absorb excess voltage and protect connected devices like your computer, television, or printer from damage.

A power surge is a sudden spike of electricity that travels through your wiring. Surges can be caused by lightning strikes near your home, power grid switching, large appliances like air conditioners turning on, and even the utility company restoring power after an outage. A strong enough surge can destroy sensitive electronics in an instant.

The best way to tell the difference between a basic power strip and a surge protector is to look for a joules rating on the label or packaging. Joules measure how much energy the surge protector can absorb before it stops protecting. A higher number is better — look for at least 400 to 600 joules for basic electronics. For computers, televisions, and home theater equipment, aim for 1,000 joules or more.

Good surge protectors also include indicator lights that tell you when the protection is still active. Over time, repeated surges wear out the protection circuitry — even if the power strip still works, it may no longer be protecting anything. Most surge protectors should be replaced every three to five years, or after any major electrical event.

If you live in an area with frequent thunderstorms, consider unplugging sensitive electronics entirely during storms rather than relying solely on surge protectors.