A surge protector is an electrical appliance designed to protect electrical equipment from surges in power, or voltage spikes. A surge protectors tries to limit the voltage supplied to the appliance by either blocking or shorting to ground the unwanted voltage.
Surges in power generally come from:
- Internal tripping events, such as lights being turned on and off
- A high in-rush of energy could generate a surge around the circuits
- Lightning strikes
A surge protecter doesn’t last forever; it’ll only absorb so many surges before it stops working itself, although it is practically impossible to tell when this will happen; the longer it has been in use the more at risk you are from it not being effective. If you are aware of it absorbing a power surge it is recommended you replace it.