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Outdoor Ethernet Thunder Lightning Surge Protector for PoE+ Gigabit 1000Mbs - LAN Network

by Tupavco

UPC: 741360887831
Model Number: TP303

Outdoor Ethernet Surge Protector is a surge protection device (SPD) that is inserted inline on an RJ45 CAT6/CAT5/CAT5e cable to prevent damage of electronic networking equipment. It can be mounted outside, and it's resistant to weather conditions (weatherproof IP44). It comes in the box enclosure which can be secured with a lock (not included).

Powerful surges that the device protects against include direct lightning strikes, voltage spikes, or PoE overvoltages. Despite the primary protection (a direct strike to a line), the thunder arrestor also offers secondary protection, which will arrest EMF induced surges (nearby lightning ethernet).

Gas discharge tubes (GDTs) are developed to overcome some of the disadvantages of diode-based protectors like energy handling capability and is suitable for almost all surge, whether high or low frequency, it can be intercepted by a gas discharge tube surge arrestor so it provides a rigorous spark discharge control performance.

Ethernet Surge Suppressor TP303 use a Gas Discharge Tube (GDT) on all 4 pairs (8 wires). Gas discharge tubes dissipate the voltage transient through a contained plasma gas which harnesses excess voltage in the incoming power and releases it safely. It ensures the safety of a wide array of valuable components such as switch, router, modem, bridge, repeater, or any part of internet service network.

Mounting holes allows easy mounting to a wall, network panel, cabinet, or rack attaching by screws (not included).

    RJ45 Lightning Protection for Gigabit 10/100/1000 (GbE) and High PoE+ Networks

    The gigabit surge protector date rate of Gigabit 10/100/1000 (GbE) transfer supports an ultra-fast maximum data rate of 1 Gigabit per second (Gbps - 1000 Mbps) and does not affect the speed performance in the local area network. POE Surge Protector allows a single RJ-45 cable to provide both data connection and electric power to device such as wireless access point, IP and security camera, VoIP phone, computer and others. Surge Arrestor TP303 is designed to protect PSE (power-supply equipment) connected to a network from transient overvoltages. The lightning protector PoE supports both Mode A (Pins 1,2+ 3,6-) and B (7,8+ 4,5-) of the 802.3af standard. 802.3af (PoE) can deliver up to 15.4 watts per port with 12.95W at the powered device, while 802.3at (PoE+) can deliver up to 30 watts with 25.5 watts available to devices. PoE Plus is also known as High PoE.


    The Ethernet lightning arrestor must be properly grounded to work. The ethernet ground wire (11 Inch - 12 AWG) on the surge protector needs to be connected to ground through the shortest path. Excess electricity will follow the path of least resistance. In most cases, a ground busbar on an electrical panel or network rack cabinet is already grounded and is typically the easiest way to ground the wire. Other options to ground RJ45 surge protector are grounding block on the breaker panel, grounding rod or terminal of the closest outlet by connecting the ground wire to circular grounding hole on the grounded outlet center screw. The lightning arrestor can be used with unshielded twisted pair (UTP) or shielded (STP) cables.

    Protection Modes Line-Line, Line-Ground

    The Line-to-Line ethernet surge protection mode helps protect against short circuits between different nodes of the network system while the Line-to-Ground mode protects against short circuits between the network node and the earth. As it is not known where the transient will happen, having both modes protected ensures damage is minimized. Nominal Discharge Current of 5KA defines the peak value of the current that can be passed through the SPD having a waveshape of 8/20μs microsecond where the RJ45 lightning arrestor remains functional after 15 surges.

    Once the surge protector ethernet voltage exceeds its designed rating it “begins to clamp” and starts to conduct energy directly to the electrical grounding system. A bidirectional clamping on CAT5 surge protector allows levels above and below the reference voltage by clamping the voltage that can cause damage.



    Ethernet network surge protector works in both directions (IN/OUT), so the source input signal cable can be connected to any side. It is not important which side the equipment is behind, however the surge protector will protect networking equipment only on the opposite side of where surge occurs. To protect devices on both sides, it is recommended to have one of the surge protectors on each end of the RJ45 cable in the network topology.

    • Maximum Discharge Current (8/20μs): 10 KA
    • Nominal PoE voltage : <60V
    • PoE current up to 2A
    • PoE Mode Support Mode A and B for Power
    • Protection Modes Line-Line, Line-Ground
    • Tested standards IEC 61643-21, IEC61000-4-5
    • Clamping Voltage Line-Ground: 72 Volts
    • Clamping Voltage Line-Line: 72 Volts
    • Impedance 100 ohms
    • Operating Temperature -40°C (-40°F) to +80°C (+176°F)
    • Outside Dimensions (W*L*H) 78*103*49 mm
    • Weight: 110 g

    Investing in a small, easy to install surge protector with all of the needed features and proven reliability can be the safest and most cost-effective solution for protecting your whole Ethernet network.

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    Ask a Question
    • For an outdoor camera or access point, do you need one one on each end? that is, one at the outdoor camera location and one at the network rack? or will just one at the network rack be OK?

      basically, you will need ethernet surge protector in front of each port where surge can occurs. If you have protector just on camera, and surge occurs between your rack will not be protected. If surge occurs at camera, you will be protected because you have protector between camera and rack.

    • What exactly is the "bi-directional Transient Voltage Suppressing (TVS) array"? The only components on the circuit boards are 4 gas discharge tubes.

      That's just a prettier way of saying "gas discharge tubes".

    • Can you please elaborate on the protection this provides against thunder?

      Thunder -No. Lightning, and static electricity, it will protect your equipment to some degree. Although there is no protection against an act of God that being a direct hit by lightning. If you ensure your grounds are done correctly and you utilize grounded ethernet cable it will do a very good job in protecting your equipment.

    • If i install this between the poe injector and outdoor access point will there be any degradation to power received by the access point device?

      You will be fine, surge protector wont affect the POE.

    • Little off topic. Any suggestions on how to ground? I have 2 protectors - one outdoors and one indoors.

      The outdoor surge protector should be grounded by a relatively heavy wire running from its ground lug to a ground rod pounded into the earth (preferably at least 6 feet long). For this application, 8 AWG or 10 AWG wire is sufficient, although some folks will suggest lighter gauge wire. The ground rod may come with a clamp that allows you to firmly attach the wire to the rod - if it doesn't, buy a proper clamp for that size rod. You should not use the same ground rod that is used for your building electrical ground, and I don't like using the same ground rod that is used by anything else, but I am rather careful about potential lightning damage - it can spread dramatically into interconnected systems.

    • I need to run ethernet to birdhouse camera mounted on a post. My house is old and doesn't have the third type grounding sockets so how would I ground?

      Drive a ground rod at bird feeder an use adapter plug with ground tail.

    • Is there a way to test to see if it was hit indirectly, we had storms and my wifi ant. Quit working, I replaced wifi ant only and came back on but dont know if protector still good.

      No, I don't know for certain. I have a number of these units in play, and when they have taken a hit, they typically blow and cease passing signal. So while I can't be certain, I think if they passing data they are good to go.

    • Is this item compatible with the Ubiquiti Air Fiber AF-24 Units?

      Yes, Poe 50v not problem at all.

    • One Jack is marked IN, and the other OUT... but I don't seem to have any directions as to which cable goes where?

      It doesn't matter which jack goes to your switch (or POE supply) and which goes to your device. The surge devices are simply connected between each Ethernet signal and ground. So just picture signals 1-8 connected together between the two jacks, 1 to 1, 2 to 2, 3 to 3, etc... Then each signal connects to a surge device (8x) which of course goes to ground. So IN can be OUT, and OUT can be IN. Just make sure to ground this device to a good earth ground. Hope this helps.

    • Do I have to use shielded cables to use this device? I realize that's recommended, but is it required for it to work?

      If this is going to be used outdoors you need to use outdoor rated cable. If not then no.

    • Do I need one on each poe port or does one satisfy grounding? My switch has many poe ports.

      If the devices connected on the other end are susceptible to lightning, then yes. If they are just devices inside your home, you are probably OK. I would make sure the switch is hooked up to a UPS.

    • Will this work between an nvr and an ip camera that is using poe to power the camera?

      Apparently so. I have it installed between the POE injector and the wireless radio that services my LAN.

    • Is this UL Listed?

      I do not know but have had no failures with this product. We use it on towers at 300 feet and they protect my Ethernet equipment from lightening.

    • My box arrive without any instructions... Do I need to conect one ground wire in the surge protector?

      Yes, there is a grounding connector near the middle bottom of the printed circuit board. Get a piece of copper wire (solid copper preferred), crimp the copper wire to the O-ring terminal, connect the O-ring terminal back to the PCB, and extended the remaining end of the copper wire to a ground rod or other appropriately earth-grounded device.

    • Can I use this to protect an ip camera outdoors? If so how which terminal on the surge protector do I connect the camera output?

      The unit has an "IN" and "OUT" Ethernet connection. In my opinion, the unit is designed to protect the equipment to which you plan to connect the IP camera. In other words, it is more likely that the IP camera or cable will be subjected to a lightening strike. If the surge protector is doing its job, then you loose the camera but protect the equipment downstream of the camera. Make sure to ground the protector using at least #10 wire. The camera output is connected to the "OUT" the router or computer is connected to the "IN". Keep in mind, that this suppressor may not protect against the enormous surge caused by a direct hit to the camera or cable.

    • I want to protect computers on both sides of an outside & exposed 200ft cat5e run. Should I terminate both ends with one of these i.e. buy 2?

      Yes. Also you want as short a ground wire as possible. Note that the cable length from the protection box to the computer needs to be longer than your ground wire. You want a higher impedance in the wire to the device being protected then the ground.

    • Does this device require POE? Will simple cat6e gigabit network be protected?

      Yes it will be protected. This device doesn't require PoE. It can be installed on non-PoE network.

    • For poe camera on a tower, how will this be mounted to the tower?

      You should ground the surge protector to your house's common electric ground so mount it as close to your power meter as possible and connect the ground wire there.

    • Which side of the PoE injector should this be placed? On the powered side (between PoE/I and the camera) or between the PoE/I and the router?

      Either side - depends where you want it grounded. This one allows DC pass through for standard PoE and PoE+. However, some PoE+ peripherals may exceed the clamp voltage.

    • How do you know if it's working properly or not? There are no indicator lights on it. Thanks.

      This surge suppressor uses fast gas discharge tubes (GDTs) to suppress high energy transients, typically from lightning, but with very low capacitance so as to not affect high speed data circuits (yes this unit works for GigE). The GDTs will show physical damage after a high energy event that leads to failure. Take a look after any lightning hit or nearby hit to your building. However, a series of smaller events may not lead to visible failure, so the unit should be replaced based on an expected frequency of smaller surge events. Note GDTs require high voltage and induced current to trigger, so a close lightning strike (e.g., your backyard) may be one minor GDT event. Check the unit and replace after ~20 such events. A GDT/MOV tester can be purchased, but they are very $$$$ (continuity test is insufficient, you need a breakdown discharge test). A multimeter continuity test will show open for a good GDT and a typcially failed GDT (failure closed is possible after a severe event in which case damage is visible) For a typical GDT datasheet see Littlefuse SL1003A Series GDTs here: