Qooltek ST-NET Ethernet Surge Protector for 10/100/1000 Base-T PoE+ Gigabit Modem Thunder & Lighting Protection ST-RJ45
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|Item Dimensions LxWxH||0.98 x 0.98 x 2.76 inches|
|Number of Ports||8|
About this item
- Make sure this fits by entering your model number.
- ✔ Imax=10KA, Isn=5KA; 7.5 inch green ground wire
- ✔ NM Surge Response Time (ns): 1 ns
- ✔ Interface Connection Type: RJ45 Female to Female
- ✔ Earthing Method: Direct Grounding System by Connecting Line
- ✔ Data Line Protection: RJ45 10/100/1000 Base-T Ethernet
Frequently bought together
Qooltek ST-RJ45 Lightening Arrestor
ST-NET Ethernet Surge Protector offers protection for sensitive electronic equipment against power surges and spikes.
-High insulation resistance
-Cast aluminum construction
Both Ends Are RJ-45 Interface
-There is no "In" or "Out" cable side of this device, both sides are identical RJ-45 Interface.
-It doesn’t matter if your equipment is behind any particular side and it doesn’t matter from which side PoE source comes.
How I installed the ST-RJ45:
Once you know how it's done, it's rather easy to install this product, but a simple diagram to supplement the written instructions
would have made it much clearer.
- The cable from the DSL ISP goes into the input port of the ST-RJ45
- The cable from the modem connects to the equipment port of the ST-RJ45
- The green ground wire is connected to the ground screw of the UPS
-Nominal Operating Voltages:
-Line-Line(Un): 5 Volts
-Line-Line(Uc): 8 Volts
-Line-Ground: 90 Volts
-Nominal discharge currents :
-Line/Line: < 5KA （8/20μs）
-Line/Ground: 10KA （8/20μs）
-Operating Environment -40-70°C(-40°F to +158°F)
-Operating Relative Humidity 0 - 95%
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In addition, they didn't even use "real" TVS diodes. They built it with 1n4007 diodes in series off of half the pins, which have no real capability as surge suppression devices. They may short with enough current through them. They may also fail open. Again, 1n4007 diodes are NOT intended as TVS - Transient Voltage Suppression - devices.
This device is basically useless for it's advertised purpose.
One thing for sure so far is that I have one of these that is now open, and the ethernet switch it was protecting was trashed also. So I would say these do not work, unfortunately. Looks like you get what you pay for. I will look for some better units for replacement.
We were having some storms last night, and I got a call from a customer that he had no WiFi. In this particular install, this surge protector was installed between a PoE injector and an EdgeRouter X. There were no lights on the ERX, so I replaced the surge protector and, Tada! His network was back up within a minute or two of my arrival on-site. The cable modem at this location was toasted by a lightning event, so he'll still have to wait for his ISP to come replace that before he has internet again. I generally advise clients to purchase their own modem, but at this location there are frequent lightning events, so it's actually more economical for him to lease the cable modem from them, and let them deal with replacing it two to three times a year when it gets knocked out by lightning. The lightning events at this location typically effect only the cable modem and whatever is directly connected to it, which tells me the offending current is coming into the house through the coaxial cable connection. Apparently, the ISP's not concerned enough to install adequate lightning protection on their equipment.
The item is bunk, it's no good.
The chassis, the ethernet receptacle housing (and the tabs which would contact with the shielded ethernet cable) did not have any electrical continuity in either direction on my multimeter.
If I can't trust the chassis to properly ground shielded cable, I am highly doubtful that it would actually protect as advertised.
But, funny thing here is, I bought two of these modules a month ago, and now this item is not available for purchase.
Shows how easy it is for bad products to slip through and make their way into the marketplace, and how slow amazon is at protecting consumers.
0/10 I would never recommend this item to anybody.
I took a peek inside the device and it seems well engineered and nicely manufactured. The extruded aluminum case gives it a sturdy feel. There is really no way to know for sure if it will prevent another 'event' but at least this time we are taking some better preventative measures.