How Does a Surge Protector Fail During a Lightning Strike?

A surge protector acts as a gatekeeper for your home's electrical system. It monitors the voltage coming from your outlets and diverts excess electricity away from your sensitive electronics. This happens through components called metal oxide varistors, or MOVs. These parts sacrifice themselves by absorbing a surge to protect your devices, which is a normal part of their operation.

When a surge protector fails from a lightning strike, it often happens internally. The MOVs inside can vaporize or melt, and circuit boards may burn. Sometimes there is a visible sign, like a burnt smell, smoke, or a tripped breaker. Other times, the unit may appear normal but its protection light will be off, indicating it can no longer guard your electronics.

After a close lightning strike, your first priority is safety. Check your home for any obvious damage, including signs of fire or water intrusion. Unplug electronics and replace any surge protectors that may have sacrificed themselves. If you suspect water has entered, you should contact local water damage pros to prevent mold. Policies vary, and your insurer decides what is covered for surge and water damage.

• Safely unplug all sensitive electronics from outlets immediately.
• Inspect every surge protector; if its protection light is out, replace it.
• Check your home for signs of fire, smoke, or electrical burning smells.
• Look for water stains on ceilings, walls, or around appliances.
• Have a qualified electrician inspect your home's main electrical panel.
• Contact your insurance company to discuss your policy's coverage for such events.