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Rugged Computers

When “uptime” matters, SEL computing platforms ensure reliable performance in the most demanding utility and industrial applications.

Rugged Computer 2

SEL computing platforms are built to withstand harsh environments in utility substations, industrial control systems, and automation systems. Industrial computer systems require 24/7 availability and ease of service when necessary. SEL computing platforms are designed with a focus on RAS—reliability, availability, and serviceability. By eliminating all moving parts (including rotating hard drives and fans) and using error-correcting code (ECC) memory technology, SEL computing platforms achieve a mean time between failures (MTBF) of over 300 years. Designed, manufactured, and tested to the same quality standards as our protective relays, every SEL computing platform comes with the unprecedented ten-year, worldwide SEL warranty.

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Versatile and Reliable Form Factors
SEL offers a range of hardware options, including a standard rack-mount server-quality model and a “mount-anywhere” compact model. All SEL computing platforms can be deployed as industrial computers running Windows or Linux operating systems, or as Blueframe application platforms. SEL also offers optional PCIe expansion cards, power supplies, and third-party monitors.

Designed and Tested to the Highest Standards

  • SEL computing platforms feature no fans or moving parts.
  • SEL computing platforms utilize the most reliable memory and storage available, ECC memory and single-level cell (SLC) SSDs.
  • SEL computing platforms are designed and tested to exceed the rigorous industry standards required for harsh operating environments. SEL computing platforms:
    • Absorb up to 15 g of impact.
    • Tolerate up to 15 kV of ESD.
    • Resist large electromagnetic fields and RF interference.
    • Offer operating temperature ranges as wide as –⁠40° to +85°C (–⁠40° to +185°F)
    • Have up to 95 percent relative humidity resistance.
    • Are immune to effects of corrosion with the conformal coating option.

Industry-Leading Warranty
While almost all industrial computer manufacturers provide a two- or three-year warranty, SEL computing platforms provide a standard ten-year, worldwide warranty.


SEL Automation Controllers Defy Brazil’s Heat

Introducing SEL-3355

SEL-3355 Thermal Management

SEL-3355 Design and Testing

System Components



The SEL-3350 is a cost-effective rack- or panel-mount computing platform featuring an Intel Atom quad-core 1.6 GHz processor.



Designed as a server-class computing platform, the tough SEL-3355 is built to withstand harsh environments in utility substations and in automation and industrial control systems.



The SEL-3360 is a compact computing platform with an Intel Core i7 multicore processor and with no moving parts, designed to keep critical processes running with the highest MTBF and longest warranty.


SEL-3390E4 Network Adapter Card

The SEL-3390E4 Network Adapter is a PCIe card designed to provide network expansion capabilities for SEL's flexible, robust computing platform line.


SEL-3390S8 Serial Adapter Card

The SEL-3390S8 Serial Adapter is a PCIe expansion card designed to expand the serial I/O capabilities of SEL's flexible, robust computing platform line.


3390T Time and Ethernet Adapter Card

The SEL-3390T Time and Ethernet Adapter Card is a PCIe card designed to add precise time synchronization and distribution functionality to SEL's flexible, robust computing platform line.