I’ve yet to see one stop 100% of a close lightning strike, but I have seen it reduce damage a good 100x on the other side of it vs. before it. I see boxes with covers blown off full of black soot, vaporized copper wire, and charred circuit boards on the half upstream of a surge protector outside of a building, and then the half on the inside of the building that is guarded by the surge protector just has a few blown SMD compontnes on the circuit board which still fried the equipement inside as I tried to replace those parts and found the traces in the layers of the circuit boards got fried too.
So everything still got fried anyways, but the damage was suppressed a lot by the surge protector in-line of the ethernet. It stopped a fire from possibly starting in the building by stopping a lot of the blast inside of equipment.
I’ve yet to see one stop 100% of a close lightning strike, but I have seen it reduce damage a good 100x on the other side of it vs. before it. I see boxes with covers blown off full of black soot, vaporized copper wire, and charred circuit boards on the half upstream of a surge protector outside of a building, and then the half on the inside of the building that is guarded by the surge protector just has a few blown SMD compontnes on the circuit board which still fried the equipement inside as I tried to replace those parts and found the traces in the layers of the circuit boards got fried too.
So everything still got fried anyways, but the damage was suppressed a lot by the surge protector in-line of the ethernet. It stopped a fire from possibly starting in the building by stopping a lot of the blast inside of equipment.