I am more fond of this one:
http://www.mccowntech.com/outdoor-dc-power-line-surge-suppressor-protector/

From: Josh Baird 
Sent: Monday, September 12, 2016 2:56 PM
To: af@afmug.com 
Subject: Re: [AFMUG] Installing SW at top of tower - what precautions should be 
taken?

Citel makes some nice DC surge suppressors that you should probably use.. they 
are ~$100/ea.  We have done it both ways.. with and without.

On Mon, Sep 12, 2016 at 4:04 PM, Gino Villarini <ginovi...@gmail.com> wrote:

  If we install a netonix SW at the tower, fed by DC and Fiber, what surge 
protection should be used? Can I do direct DC or should i protect the DC? 

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