Use only power surge protection when your outlet voltage is not stable to reduce the overflow voltage. So, surge protection could help reduce the risk of any parts of your miner.
however, if your miner is always shutdown every time your area is blackout without shutting it down your miner can damage unless if you are using other bootable OS like ethOS or smOS these OS that I know it's safe for blackouts Also, I suggest you if you are using h110 btc pro you can set the bios to auto power on everytime your miner shutoff.
You do NOT need a surge protector for an "outlet voltage that is not stable". The ATX power supply will handle well over 240ac input. Read the label on it. however, if your miner is always shutdown every time your area is blackout without shutting it down your miner can damage unless if you are using other bootable OS like ethOS or smOS these OS that I know it's safe for blackouts Also, I suggest you if you are using h110 btc pro you can set the bios to auto power on everytime your miner shutoff.
It already has surge protection built in. The computer which actually runs on 12vdc and less (CPU and memory is less) is isolated from the incoming 120vac (or even 240vac overseas) by design since there are a few stages that are isolated via transformers within power supply during the conversion from ac to dc in the power supply. So essentially it would take lightning to jump the electronic gaps within the power supply (Transformers, diodes, transistors, mosfets, etc.) The power company is not going to jump those gaps UNLESS some moron some how managed to get a cross country power line connected to your house grid! Which is not likely to ever happen.