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Rugged Computers

When “uptime” matters, SEL computers provide
dependable computation for critical infrastructure.

Rugged Computer 2

SEL computers 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 computers 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 compact industrial computers have a mean time between failures (MTBF) of 100+ years. Designed, manufactured, and tested to the same quality standards as our protective relays, every SEL computer comes with the unprecedented, ten-year worldwide SEL warranty.

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Versatile and Reliable Form Factors
SEL offers a standard rack-mount server-quality industrial computer and a “mount-anywhere” compact industrial computer. SEL also offers optional PCIe expansion cards, power supplies, and third-party monitors.

Designed and Tested to the Highest Standards

  • SEL computers feature no fans or moving parts.
  • SEL computers utilize the most reliable memory and storage available, error-correcting code (ECC) memory and single-level cell (SLC) SSDs.
  • SEL computers are designed and tested to exceed the rigorous industry standards required for harsh operating environments. SEL computers:
    • Absorb up to 15 g of impact
    • Tolerate up to 15 kV of ESD
    • Resist large electromagnetic fields and RF interference
    • Offer a wide temperature range of –40° to +75° C
    • Have up to 95% 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 computers provide a standard, no-questions-asked, 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


SEL-3360 Compact Industrial Computer

The SEL-3360 is a Compact Industrial Computer with Intel Core i7 multicore computer with no moving parts built to keep critical processes running with the highest MTBF and longest warranty.


SEL-3355 Rack-Mount Computer

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


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 computer line.


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 computer line.