Network Surge Protector
Best Ethernet & PoE Protection
The best network surge protector for Ethernet and PoE lines — protecting IP cameras, switches, routers, and wireless APs from lightning-induced surges. TPKX-RJ45 Series network surge protector: 6 models covering 100Mbps, 1Gbps, PoE, PoE+ and DIN rail installation. IEC 61643-21 compliant. <10ns response. Full 1Gbps bandwidth maintained. Factory-direct wholesale from TrilPeak — OEM & ODM ready.
Network Surge Protector — TPKX-RJ45 Ethernet & PoE Series
The TrilPeak TPKX-RJ45 network surge protector series protects all RJ45-based Ethernet and PoE lines from lightning-induced surges and switching transients. Every network surge protector in the TPKX range maintains full signal bandwidth — 100Mbps or 1Gbps — with no measurable insertion loss during normal operation. All models comply with IEC 61643-21. Need help choosing the right model? See the Ethernet SPD guide or use the selection table below.
Ethernet surge protector for 100Mbps Fast Ethernet networks. Cat5/Cat5e. Protects pins 1,2,3,6. Inline installation — no configuration required.
PoE surge protector for 100Mbps lines. Protects all 4 pairs — data pairs and PoE power pairs — simultaneously. PoE at 48V DC. IEEE 802.3af compatible.
Gigabit Ethernet surge protector for 1000BASE-T networks. Cat6. Protects all 8 pins (4 pairs). 250MHz bandwidth — full 1Gbps link speed maintained after installation.
PoE+ surge protector for 1Gbps Gigabit lines. Protects all 8 pins simultaneously — data and PoE power pairs. IEEE 802.3at (PoE+, 30W) compatible at 48V DC.
DIN rail PoE+ surge protector for 1Gbps networks. Clips onto 35mm DIN rail — identical surge protection to the inline model, panel-mount form factor.
DIN rail Gigabit Ethernet surge protector without PoE. Identical protection to the inline 1Gbps model, designed for mounting inside network distribution panels and industrial enclosures.
TPKX-RJ45 Network Surge Protector — Full Specifications
| Model | Bandwidth | Data Rate | Un | Uc | In (8/20µs) | Imax | Up | PoE | Mount | Standard |
|---|---|---|---|---|---|---|---|---|---|---|
| TPKX-RJ45 | 100MHz | 100Mbps | 5Vdc | 6Vdc | 3kA | — | ≤30V | — | Optional DIN | IEC 61643-21 |
| TPKX-RJ45-POE | 100MHz | 100Mbps | 48Vdc | 65Vdc | 3kA | — | ≤100V | PoE | Optional DIN | IEC 61643-21 |
| TPKX-RJ45-1000 | 250MHz | 1000Mbps | 5Vdc | 8Vdc | 3kA | — | ≤30V | — | Optional DIN | IEC 61643-21 |
| TPKX-RJ45-1000-POE | 250MHz | 1000Mbps | 48Vdc | 65Vdc | 3kA | — | ≤100V | PoE+ | Inline | IEC 61643-21 |
| TPKX-RJ45-1000-POE (DIN) | 250MHz | 1000Mbps | 48Vdc | 65Vdc | 3kA | 10kA | ≤100V | PoE+ | DIN 35mm | IEC 61643-21 |
| TPKX-RJ45-1000 (DIN) | 250MHz | 1000Mbps | 5Vdc | 8Vdc | 3kA | 10kA | ≤30V | — | DIN 35mm | IEC 61643-21 |
All models: SPD Type C2/C3 · Response <10ns · IP20 · Aluminum housing · −40°C to +80°C · Altitude 4,000m · RJ45 female connectors · Pins protected: 1,2,3,6 (100Mbps) / 1–8 all pairs (1Gbps/PoE)
Why Ethernet Lines Need Surge Protection — And What Happens Without It
A 100m Cat6 cable run from a rooftop camera to an indoor switch acts as an antenna during a thunderstorm. IEC 62305 estimates a 1kA/µs current rise rate on a struck cable — enough to destroy the RJ45 transceiver, the connected switch port, and sometimes the NVR behind it. The TPKX-RJ45 network surge protector uses a two-stage clamping circuit to intercept this energy at the cable entry point, diverting it to earth before it propagates through structured cabling.
Stage 1 (GDT) handles the bulk energy discharge — high current capacity, triggers in <100ns. Stage 2 (diode clamping) limits residual voltage to ≤30V (data models) or ≤100V (PoE models) within <10ns total. Single-stage SPDs cannot achieve both high energy capacity and low clamping voltage simultaneously.
IEEE 802.3af/at PoE uses pairs 1-2/3-6 for data and pairs 4-5/7-8 for power. The TPKX-RJ45-POE series protects each pair independently with matched impedance — preventing PoE voltage from forward-biasing the data protection circuit and vice versa.
The TPKX series has RS=15Ω per protector. For 100BASE-TX (Cat5e), this is within IEEE 802.3 channel requirements. For 1000BASE-T (Cat6), the 15Ω is absorbed within the auto-negotiation and equalisation margin. For runs exceeding 80m, verify link quality with a cable certifier after installation.
Lightning-induced surges on Ethernet cables arrive primarily as common-mode transients — affecting all conductors simultaneously relative to earth. The TPKX topology clamps common-mode voltage first, then limits differential-mode residual, matching the actual waveform that arrives on outdoor cable runs.
Which Network Surge Protector Do You Need?
Match the TPKX-RJ45 to your network speed, PoE requirement, and installation method:
| Requirement | Recommended Model |
|---|---|
| 100Mbps Ethernet, no PoE | TPKX-RJ45 |
| 100Mbps with PoE (IP cameras, APs) | TPKX-RJ45-POE |
| 1Gbps Gigabit, no PoE | TPKX-RJ45-1000 |
| 1Gbps with PoE+ (high-power devices) | TPKX-RJ45-1000-POE |
| 1Gbps PoE+, panel/cabinet mount | TPKX-RJ45-1000-POE (DIN) |
| 1Gbps no PoE, panel/cabinet mount | TPKX-RJ45-1000 (DIN) |
Per IEC 62305-4: install one SPD at each LPZ boundary crossing. For outdoor Ethernet runs ≥50m between separate buildings with independent earth systems, protect both ends.
Where Network Surge Protectors Are Required
IP Camera & CCTV Systems
- Outdoor IP cameras on PoE lines up to 100m (Cat6 maximum channel length) — each outdoor-to-indoor cable crossing requires a PoE surge protector at the building entry point
- NVR and video management systems — a single unprotected PoE switch port destroyed by a surge event can take the entire camera network offline
- Roof-mounted or pole-mounted cameras in open areas have higher lightning exposure than cameras installed under roof overhangs
- Multi-camera installations: one surge protector per camera line, installed at the patch panel or closest indoor junction point
Campus & Multi-Building Networks
- Ethernet cables between separate buildings cross an LPZ 0/1 boundary — IEC 62305-4 explicitly requires SPD protection at both ends when two buildings have independent earth electrode systems
- Potential difference between building earth systems during a nearby lightning strike can drive several hundred volts along the cable shield even without a direct hit
- Fibre optic inter-building links do not require SPDs; only copper Ethernet runs between buildings are at risk
- DIN rail models (TPKX-RJ45-1000 DIN) are recommended for installation inside the main distribution frame or patch panel cabinet at each building entry
Industrial Ethernet & Automation
- Variable frequency drives (VFDs) and motor contactors generate 0.5–2kV differential switching transients on cable trays shared with Ethernet cables — relevant even in buildings not exposed to lightning
- PROFINET, Modbus TCP, and EtherNet/IP industrial protocols run on standard Cat6 cabling that is susceptible to the same surge threats as commercial Ethernet
- PLC network ports typically lack built-in surge protection; a damaged PLC Ethernet port can take an entire production line offline
- DIN rail models integrate directly into control panel wiring alongside other DIN-mounted protection devices
Why Source Your Network Surge Protector from TrilPeak?
TrilPeak manufactures Ethernet and PoE surge protectors in-house — from component production through to 100% routine testing before shipment. Every TPKX-RJ45 network surge protector is IEC 61643-21 compliant and supplied direct to panel builders, system integrators, OEM brands, and distributors worldwide.
Tested to IEC 61643-21 — Not Just Self-Declared
All TPKX-RJ45 models are tested to IEC 61643-21 (signal line SPDs) and IEC 61000-4-5 (surge immunity). PoE models additionally verify compatibility with IEC 61000-4-5 at 48V DC. CE Declaration of Conformity and full test reports are available — not just a CE marking on a label.
Signal Integrity — No Compromise on Bandwidth
Cheap SPDs with poorly matched impedance introduce reflections on Cat6 cabling that degrade 1Gbps link quality. TrilPeak TPKX-RJ45-1000 models are impedance-matched to 100Ω differential (Cat6 standard) and tested for insertion loss and return loss across the 1–250MHz bandwidth — not just for surge discharge capacity.
PoE Pass-Through — Verified at 48V DC Load
TrilPeak PoE surge protector models are tested under PoE load at 48V DC — not just surge-tested on an open circuit. This confirms the protection components do not clamp at PoE operating voltage and that PoE power delivery is unaffected after a surge discharge event. IEEE 802.3af and IEEE 802.3at compliance confirmed.
OEM Supply — Your Brand, Your Documentation
TrilPeak supplies Ethernet surge protectors under OEM and private label arrangements to network equipment brands, panel builders, and security system integrators. Custom packaging, product labels, and CE documentation in your company name. MOQ negotiable. Sample delivery within 7 days.
Network Surge Protector — Ethernet & PoE Buyer FAQ
What does a network surge protector protect against?
A network surge protector protects RJ45 ports and transceivers from lightning-induced common-mode surges, switching transients from contactors or VFDs on shared cable trays, and electrostatic discharge during installation. It does not protect against sustained overvoltage or power-cross faults — those require a different protection category. For outdoor Ethernet runs, the primary threat is indirect lightning (electromagnetic induction on the cable), not direct strike. See the Ethernet SPD guide for waveform and installation details.
Is a network surge protector required by IEC standards?
IEC 62305-4 (Protection of electrical and electronic systems within structures) requires surge protection at Lightning Protection Zone (LPZ) boundaries. Any Ethernet cable crossing from LPZ 0 (outdoors) to LPZ 1 (inside a building) constitutes a zone boundary requiring an SPD. IEC 61643-21 defines the test requirements for signal line SPDs. If your project specification references IEC 62305-4 compliance, all copper Ethernet cables entering buildings must be protected.
What is the difference between SPD Type C2 and C3 on the TPKX series?
The TPKX-RJ45 models carry dual classification C2/C3. Type C2 covers devices installed at or near the equipment, tested with a 1.2/50µs combination wave. Type C3 covers devices at the LPZ 1/LPZ 2 boundary, tested with an 8/20µs current waveform. Carrying both classifications means the TPKX-RJ45 meets requirements for both installation positions — useful when the LPZ boundary location is flexible in the installation design.
Can I use a PoE surge protector on a non-PoE Ethernet line?
Yes, but it is not recommended for cost efficiency. PoE surge protector models (TPKX-RJ45-POE and TPKX-RJ45-1000-POE) have higher Uc ratings (65Vdc) to withstand PoE voltage continuously — on a non-PoE line this headroom is unnecessary. Use the data-only models (TPKX-RJ45 or TPKX-RJ45-1000) for non-PoE lines: their lower clamping voltage (≤30V vs ≤100V) provides tighter protection for lower-voltage transceiver circuitry.
How many network surge protectors do I need per cable run?
For outdoor Ethernet cable runs entering a building: install one SPD at the building entry point bonded to the local earth. For runs exceeding 50m exposed to open-air lightning risk, install a second SPD at the far end. For cables running between two separate buildings with independent earth systems — install one SPD at each end bonded to the local earth, as potential differences between the two earth systems during a lightning event drive surge current along the cable regardless of whether the cable was directly struck.
What certifications do the TPKX-RJ45 network surge protectors carry?
All TPKX-RJ45 models comply with IEC 61643-21 and IEC 61000-4-5. PoE models additionally comply with IEEE 802.3af (PoE, 15.4W) and IEEE 802.3at (PoE+, 30W). CE Declaration of Conformity is included. Full IEC test reports covering surge current, insertion loss, and bandwidth are available from TrilPeak on request — required for project documentation and panel builder compliance files.
Guides & Related Products
Request a Quote — Network Surge Protectors for Ethernet & PoE
TrilPeak supplies the best network surge protectors for Ethernet and PoE lines to integrators, panel builders, and OEM manufacturers in 50+ countries. IEC 61643-21 compliant. Factory-direct pricing. Samples in 7 days.