RJ11 Telephone Fax Surge Protector - Protective Device with 10KA Surge Capacity, Multi-Level Protection, 2Mbps Transmission, Easy Installation

Works great so far! 8 months in.

The FSD-RJ11 is well built and well designed and should work. The deficiencies are that there is no easy way to mount it, so have some wire ties available to secure it. But the major deficiency is that the pins are not identified and there is no schematic. If you connect it incorrectly, you do not obtain full protection. So I took mine apart. There are two independent 2 wire circuits that are protected. One goes between pins 2-3 on the input side to pins 2-3 on the output side, the other is connected from pins 4-5 to 4-5. Also, don't swap the input and output sides, it matters.

I bought this to use after a lightning strike took out my DSL modem and router last year. I had it installed correctly with the ground connected to my home's ground circuit - goes to an 8 foot ground rod. We had another bad storm and lightning came in and went right through to take out the modem and router again.

I like this unit, specs looked good. The pigtail ground works when the grounding attach point is within 8 inches (or so) of the unit's installation point. Mine wasn't. Also missing was any kind of mounting bracket or attached mounting point. My problem - I was looking at the electrical side and not the mechanical. Good unit, hope I never need it.