You will want to check out these.

https://mccowntech.wptstaging.space/product-category/surge-protectors/rack-mount-surge-protectors/

They are made to fit into the 1U APC Chassis PRM24.

We rely on them heavily in the WISP Market.  I've had equipment on a tower that was physically destroyed by lightening, and the Router Port on the other side of these arrestors was just fine. 

On 8/13/2019 1:51 PM, Rob Pickering wrote:
On Tue, 13 Aug 2019 at 19:23, Javier J <javier@advancedmachines.us> wrote:
I'm working with a client site that has been hit twice, very close by lightening.

I did lots of electrical work/upgrades/grounding but now I want to focus on protecting Ethernet connections between core switching/other devices that can't be migrated to fiber optic.

I was looking for surge protection devices for Ethernet but have never shopped for anything like this before. Was wondering if anyone has deployed a solution?
They don't have a large presence on site (I have been moving all of their core stuff to AWS) but they still have core networking / connectivity and PoE cameras / APs around the property.
Since migrating their onsite servers/infra to the cloud, now their connectivity is even more important.

The correct answer is use fiber.

If you really, really can't then APC make a single port transient arrestor p/n PNET1GB.

I've used these in the past for a PoE phone in a wooden gatehouse hut right on the 100M max length with no power for active kit and they seem to work fine. I'm using one at the moment for a PoE access point in my garden shed. Not sure I would bring an inter building link in copper onto an expensive core switch though.

Don't know of anything in higher density than "one port".

--
Rob Pickering, rob@pickering.org