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Making Electric Power Safer, More Reliable, and More Economical

SEL specializes in creating digital products and systems that protect, control, and automate power systems around the world. This technology prevents blackouts and improves power system reliability and safety at a reduced cost. A 100 percent employee-owned company headquartered in Pullman, Washington, SEL has manufactured products in the United States since 1984 and serves customers worldwide.

As part of our commitment to designing and manufacturing reliable, high-quality products, we research, design, build, test, distribute, teach, and support each of our technologies at SEL facilities. Assembled SEL products travel directly from our hands to where they need to be, so we feel confident that you and your customers can rely on them to keep critical systems fully operational.



  • Digital Protective Relays - Transmission, Distribution, Transformer, Generator, Motor, Bus, etc.
  • Metering - Revenue, Relay, Power Quality, Harmonics, Load Profile
  • Satellite-Synchronized Clocks
  • Synchrophasors & Phasor Measurement Units (PMUs)
  • Information Processors - Substation computers, I/O, Automation, Logic, Controllers
  • Networking and Communications - Fiber optic, Ethernet, Serial, Wireless
  • Annunciation / Alarm Panels
  • Software - Programming, Event Reporting, Analysis
  • Faulted Circuit Indicators
  • Enclosures, Panels, and Custom Solutions
  • Engineering Services - Protection & Automation Engineering, Arc Flash Study, Power Management & Control Systems - SCADA, Auto Synchronization, Load Shedding, etc.
  • SEL-University - Training
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