Westermo Viper-120A-T4G-P8-LV Managed Ethernet Switch | Easy World Automation

Westermo Viper-120A-T4G-P8-LV Managed Ethernet Switch

  • EN 50155 Managed Gbps PoE Switch

  • 4 x Gbps ports, whereof 2 PoE
  • 16 x 100 Mbps ports, whereof 6 PoE
  • 1 x USB
  • 1 x RS-232 console port


The Viper-120A-T4G-P8-LV is a managed 20-port switch optimized for the needs of the railway rolling stock market. PoE ports offer effective powering of end devices. Gbps ports cope with high bandwidth devices such as access points and NVRs (Network Video Recorders).

The Viper is designed to withstand the tough environment on-board trains, exposing the switch to constant vibration, extreme temperatures, humidity, and a demanding electrical environment.

A GORE-TEX® membrane prevents internal condensation. Threading integrated into the chassis provides for additional vibration resistance. High-level isolation between all interfaces enables direct connectivity to vehicle auxiliary power and protects against overvoltage and flashover. IP67 protection prevents the ingress of water and dust. An overall optimized design results in an extremely compact package in combination with very high MTBF for easy integration and low lifecycle cost.

Thorough type testing at independent ISO/IEC 17025 and ILAC MRA-certified labs, accredited to a wide range of standards, show that the Viper series fulfills EN 50155 and other requirements. The state-of-the-art Westermo production facility ensures the quality of each individual unit, e.g. through temperature cycling burn-in testing.

The WeOS operating system offers an extensive suite of IP networking features for resilient and flexible networks, e.g. the FRNT ring protocol with very fast failover on 100 Mbps ports as well as Gbps ports. The backup device accessory matches the Viper in robustness and offers easy configuration updates and backups.

Meeting the requirements of the railcar market, the Viper is very well suited for deployment in any other application with severe operating conditions and tough environments, for instance in the mining industry.

Discover industrial automation solutions appropriate to your needs, and easily inquire about the Westermo Viper-120A-T4G-P8-LV Managed Ethernet Switch through our user-friendly website via one of our Middle East branches (UAE (Dubai), KSA (Al Khobar, Riyadh), and Oman). 


Ethernet ports 4 Gbps, whereof 2 PoE + 16x100 Mbps, whereof 6 PoE
Console Port 1 x RS-232
Power Requirements
Operating Voltage 16.8 to 49.4 VDC (14.4 to 53.2 VDC for 100 ms)
Rated voltage 24 to 38 VDC
Rated current 5.0 A at 24 V and 3.2 A at 38 V
Rated PoE power Max 80 W total; max 30 W on a single port
Power interruption Class S2 (10 ms hold-up) for the switch and connected PoE devices
MTBF 363,000 hours (MIL-HDBK-217F2)
Backup and restore port 1 x USB
Physical Characteristics
Dimensions 178 x 160 x 110 mm (7.01 x 6.30 x 4.33 inches)
Operating Temperature -40 to +70°C (-40 to +158°F) (+85°C for a limited time
Storage Temperature -55 to +85°C (-67 to +185°F)
Weight 2.5 kg
IP Rating IP67
EMC EN 61000-6-2, Immunity industrial environments, EN 61000-6-4, Emission industrial environments, EN 50121-3-2/IEC 62236-3-2 Railway applications – Rolling stock – apparatus, Tested and verified for Class S1, DB EMC Regulation 06, Commodity team Radio compatibility in VDB Rev 1.0 (Shunting Radio). Compliant with SBB requirements, Tested and verified for Class S1, ÖBB Radio compatibility in near field in accordance with ÖBB Infrastructure Edition 4, Revision 14 (Shunting Radio), Tested and verified for FCC part 15