Power strips and surge protectors both multiply the number of available outlets, but they work in fundamentally different ways.
Power strips are basic extension blocks that simply split one wall socket into multiple outlets. They contain no electronic components and provide zero protection against electrical surges or spikes. They function as passive distributors only.
Surge protectors include a metal oxide varistor (MOV) component that monitors incoming voltage. When voltage exceeds safe levels, the MOV diverts excess current to the ground wire, automatically cutting power to connected devices. This happens in milliseconds.
Why it matters: Electrical surges occur from lightning strikes, power outages, or faulty wiring. A single surge can destroy expensive electronics permanently. Surge protectors cost only slightly more than basic power strips but can save hundreds in device replacement.
Key differences:
- Protection: surge protectors offer it, power strips do not
- Component count: surge protectors contain active electronics, power strips are purely passive
- Lifespan: MOV components degrade over time and eventually stop working, whilst power strips last indefinitely
- Indicator lights: most surge protectors include a light showing whether protection remains active
Common gotchas: Do not daisy-chain surge protectors together. MOV components degrade silently, so replace surge protectors every 3-5 years. Budget models may offer insufficient joule ratings (energy absorption capacity) for expensive kit. Always check the joule rating for your specific devices.
For sensitive equipment like computers, printers or televisions, always use a genuine surge protector with a reasonable joule rating (1000+ joules for most home use).