Originally Posted by jonnyGURU
Cheap power strips are nothing more than a few MOVs (the higher the Joule rating of the power strip, the more MOVs are used) in line between the AC input and AC outlets.
If a surge exceeds the value of the MOV, the MOV triggers or burns out. Unless that happens, power is continuously delivered to the PSU as if the power strip isn't even there.
FYI: Decent PSUs also have their own MOVs in them utilizing the same type of surge suppression you find in power strips.
The only products that regulate voltage are voltage regulators, or "AVR's". These are much larger than your standard power strip. They're essentially large transformers that either buck or boost the line voltage to maintain a continuous output voltage. Many "better" UPSs have AVR built into them.
The issue that we often see with "power protection" and PSUs has more to do with UPSs that have simulated sine-wave output when on battery power. Some PSUs see the transition from a pure-sine signal from the wall to a square sine wave as a transient spike and this causes the PSU to trip off. This DOES NOT damage the PSU though.
Hope this helps!
Thanks a lot Jon!
That clears out a lot of things. Congrats on your website, it has been very useful to me!
Just a couple more questions, if you have the time:
1) It makes sense to have a surge protector just because if there is a surge the MOVs burnt out (in case they burn out) are the ones in the surge protector and not the ones in the power supply which is more expensive? Any negative in having a surge protector for the PC?
2) These voltage regulators (on their own or in a UPS) provide any benefit to the PC? I guess maybe they reduce the job that has to do the power supply and maybe improve its longevity or not? Any negative in having one for the PC?
3) I thought that a UPS used current to charge its batteries and the power supplied to the things connected to it was always from the batteries, so no matter the current received by the UPS the output was always the same and always safe being from the batteries, but this is not how they work, right? The only benefit in having a UPS is being able to use equipment when the light goes out for a few minutes, and provides no additional benefit or pitfall than a voltage regulator (for those UPS that have voltage regulation), right?