10 / 100 / 1000M Ethernet Surge Protector (Industrial / Passive)


  •    In Stock

- Instant Volume Discounts
- FREE Worldwide Shipping / Optional Express Shipping
- Require a Custom Solution? Contact us now


The SPD-ETH-1 is a passive, rugged, industrial-grade, 10 / 100 / 1000M Ethernet surge protector that can be used to limit the voltage surges and spikes introduced to the Ethernet data lines. The unit features 2-stage surge protection – Gas Discharge Tubes (GDT) and Transient Voltage Suppressors (TVS). The SPD-ETH-1 is designed to connect in series to the input of the protected equipment; when a high-voltage surge is introduced into the input, the GDT conducts electric current after becoming ionized, which in turn discharges the high-voltage surge to the earth ground. The excessive voltage will be further clamped to a safe range that the equipment can accept by the TVS. This industrial Ethernet surge protector features passive circuitry designs and thus requires no external power; it supports data rates up to 1000Mbps and can be used for protecting 10 / 100 / 1000M Ethernet equipment. This product comes with a dedicated cable lug for solid earth ground connections and can be mounted directly onto a standard 35mm DIN rail, making it an ideal solution for heavy-duty industrial applications. 

CommFront's products quality is ensured by our ISO-9001 quality control system (Cert No. SG12/04213, strictly certified by SGS), and we back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee.


  • Rugged industrial-grade 10 / 100 / 1000M Ethernet surge protector (passive).
  • Protects 10 / 100 / 1000M Ethernet data lines.
  • 2-stage surge protection.
  • RJ45 female sockets for easy connections.
  • Dedicated cable lug for solid earth ground connections.
  • Passive circuitry, no power is required.
  • Supports data rates up to 1000Mbps.
  • Direct DIN-Rail mounting.
  • Operating temperature: -40°F to 185°F (-40°C to 85°C).
  • Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
  • Test Standards: IEC61643-21 / EN61643-21.
  • 5-year manufacturer’s warranty.


Compatibility: IEEE 802.3, 802.3u, 802.3ab standards
Protection: 2-stage surge protection (Gas Discharge Tubes and Transient Voltage Suppressors)
Power Source: Passive device, no power required
Clamping Voltage (stage 1): 120 V
Series Resistance (stage 2): ≤0.5 Ohms
Clamping Voltage (stage 3): 58 V
Response Time: ≤1ns
Insertion Loss (100MHz): ≤1dB
Data Rates: 10/100/1000Mbps (auto-switching)
Cable Lug for Earth Ground: Dedicated cable lug for earth ground connection (cable size: up to 12AWG / 3.3mm2)
Connectors/Sockets: RJ45 female sockets (protected pins: 1,2; 3,6; 4,5; 7,8)
Dimensions (H x W x D): 3.0 x 2.4 x 1.0 in (75 x 62 x 25 mm)
Mounting: Direct 35mm DIN-rail mounting
Weight: 3.7 oz (106 g)
Operating Temperature: -40°F to 185°F (-40°C to 85°C)
Operating Humidity: 5~95% RH (no condensation)





CommFront products are strictly certified by SGS and/or TUV - the Nationally Recognized Testing Laboratories [NRTLs] in North America (approved by OSHA) and the Notified Bodies in the European Union. Learn More




CommFront products are designed and manufactured to ISO 9001 standards. Our quality control system is strictly certified by SGS (Cert No. SG12/04213). Learn More




CommFront products have been proven to be reliable. We back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee. Learn More

We Also Recommend


2-Wire RS485 Surge Protector (Industrial / Passive)



4-Wire RS422 / RS485 / RS232 Surge Protector (Industrial / Passive)