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TII 212 Broadband Cable TV Lightning Surge Protector

by TII
4.5 out of 5 stars 172 customer reviews
| 29 answered questions

List Price: $21.99
Price: $13.97 & FREE Shipping on orders over $35. Details
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  • Enter your model number above to make sure this fits.
  • Protects expensive HDTV receivers, DVRs, cable modems, etc. from potentially damaging surges.
  • Unique In-Line® design is virtually transparent to all analog or digital signals from DC to 1GHz.
  • Provides superior protection against high and low voltage transient surges.
  • Protection element is designed to reset after each surge event, with a service life of up to 1500 surges.
  • 5-year warranty when purchased from an Authorized TII Dealer. Warranty not valid when purchased through other outlets.
5 new from $13.97

Did you know surge protectors wear out over time?

Check out the Surge Protectors Buying Guide to learn how surge protectors keep your devices safe.
$13.97 & FREE Shipping on orders over $35. Details Only 1 left in stock. Sold by cableTVamps and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

  • TII 212 Broadband Cable TV Lightning Surge Protector
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Total price: $35.44
Buy the selected items together


Technical Details

  • Brand Name: TII

Product Description

If you want to protect your expensive home theater from lightning and other outside surges that come over the cable TV line, then this is what you need. TIIs cutting edge In-Line® Coaxial Lightning Surge Protectors protect personnel and customer equipment, e.g. Televisions, Cable Set Top Boxes and Cable Modems from lightning and power induced surges on coaxial cables. It is specifically designed for todays Broadband signals carried over the coax cables.

Product Details

  • Item Weight: 2.9 ounces
  • Shipping Weight: 3.2 ounces (View shipping rates and policies)
  • ASIN: B0016AIYU6
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (172 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: March 20, 2008

Customer Reviews

Top Customer Reviews

Verified Purchase
This review is a bit speculative, because afaik there's only one way to know whether it actually works, and I'd rather not take a lightning strike to find out...

The product came well recommended, and looks to offer excellent value for the price. It fit perfectly in place of the F-F grounding coupling in the entry box; installation took all of five minutes. Service was unaffected after installation; saw no significant signal loss per my DVR's diagnostic screen. Internet access and speed were unaffected.

The reason I'm not awarding five stars is a rather nasty surprise I received when reading the instruction booklet: it specifies use only with RG59 cable. It was in fact adamant on this point, specifying adapters (not included) on each side for use with RG6. The product description claims "It is specifically designed for todays Broadband signals carried over the coax cables." I know of no modern cable application that still uses RG59, including my own. I did not use adapters; have no idea what the implications are, but hoping it isn't a safety issue. Either way, this does not inspire 100% confidence in the product. At the very least, this limitation should be made clear in the product description.

So, five stars for the unit itself, minus one for the incomplete product description.
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Verified Purchase
I ordered two of these after I ditched my cable TV for a rooftop antenna but kept my cable internet. They look very well-made and are heavier than they look (not hollow). Installation wasn't hard--you just screw on the coaxial ends and make sure it's grounded well. I grounded them by wire using the hole and screw that is in each product. I can't say how well it works because lightning hasn't struck my house yet, but I bought it because it's the only UL listed surge protector that's this type (not the kind you plug in the wall). Antenna signal strength is diminished, but it's only noticeable when you actually scan for signal strength because all of the channels that I get are digital. I have 20 Mbps cable internet and it still runs at full-speed.
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Verified Purchase
First off, I did some research on this device long before I purchased it. The data sheet from the manufacturer is available here:

tiinetworktechnologies<dot>com/repository/datasheetlibrary/NYMDS036-0710<dot>pdf

Installation instructions are here:

tiinetworktechnologies<dot>com/repository/installationsheetlibrary/92219901-tii_210&212_InstNt<dot>pdf

(replace the <dot> with a period to complete the URL.)

It should be noted that there is a shock hazard if this device is not installed inside a listed indoor/outdoor enclosure. This does not say it won't work, only that you might be exposing yourself to a shock hazard. I simply installed the block in a protected location that is out of the direct weather and not likely to be touched by humans (on a joist under a covered porch).

Three very important characteristics apply to this device:

1) It protects surge from both the shield AND the center conductor. The standard 'block' does not protect the center conductor.

2) Automatically resets. A couple other devices on the market will shunt to ground, but then are done. While the amount of energy dissipated matters (see the data sheet), this device can reset and provide service more than once.

3) Can conduct power. If you use a pre-amp on your antenna or your cable service needs a powered feed to the distribution box, that power will still flow through the coax and this device.

It should be noted that the specifications do indicate a signal loss of roughly 0.2db (they guarantee < 0.3), so some signal will be lost from this device. However, this loss is minimal, and typically less than many cable to cable couplers will cause.
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2 Comments 15 of 17 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
I've been in the custom audio/video industry for 17 years and have been using surge protectors the whole time. The most common complaint with a product like this is that it degrades the signal in some way.

Most CATV surge protectors are built into other surge protectors so I liked the idea of an independant unit like this. I have now used it for several months and not noticed any degradation in the signal at all. The signal I am referring to is a TV antenna being used for TV channels (digital) and FM stations (analog and digital). All my TV stations are coming thru without issues and all my FM stations are as well.

I also like the provisions for mounting the device on a board and easy grounding. Its surprising how many products overlook these simple features.

I have not had any surges so I cannot comment on this product's surge protection prowess.
Comment 18 of 21 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
With zillions of dollars of equipment at home connected to the cable entering my house (flat screen TVs, broadband cable modem, etc.), this device provides some peace of mind. Although I have whole-house surge protectors, those don't guard the cable TV cables and the attached devices, so I consider this absolutely necessary. (I also have something like this for my landline telephone and my ethernet (coming off the cable modem, reviewed elsewhere).

After installing this, I noticed no degradation to either my cable television service or broadband speed. One of these days I will post photographs of my Data/Comm/TV distribution panel showing this device. Please check back in about a month.
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