Nothing Trips Faster and More Securely
than the SEL-T400L
When Downtime Isn't an Option
Engineer a Better Network
Making electric power safer, more reliable, and more economical
SEL partners with customers around the world to ensure the safe, reliable, and economical delivery of electric power. We design, manufacture, and support a complete line of products and services, ranging from generator and transmission protection to distribution automation and control systems. An employee-owned company, SEL's core values drive the way we view our community, industry, company, and environment.
Services and Solutions
motorMAX Low-Voltage Motor Management and Protection System
SEL’s motorMAX is a centralized smart motor control and protection system designed for high-value, low-voltage processes.
Distribution Automation – SEL’s DNA
SEL offers a wide range of distribution automation solutions to fit every application.
Arc-Flash Solutions
SEL combines light-sensing technology with fast overcurrent protection to provide high-speed arc-flash detection (AFD).
Featured Products
SEL-849 Motor Management Relay
The SEL-849 Relay offers the best thermal-based motor protection and arc-flash detection, all in a compact, easy-to-install design.
SEL-3360 Compact Industrial Computer
Keep your critical processes up and running with the SEL-3360 line of industrial computers. SEL computers feature the industry's highest MTBF and a 10-year, no-questions-asked warranty.
Rotary Switches
Robust design with customizable specifications that reduce installation time by 30%.
SEL-3555 Real-Time Automation Controller (RTAC)
The fastest, most powerful and secure RTAC for advanced data concentration and control. Now with 100,000 tags!
Education and Events
Modern Solutions Power Systems Conference
We invite you to join the discussions and be part of the solutions at the 2017 Modern Solutions Power Systems Conference in Chicago, Illinois, June 7–9.
SEL University - Power Through Knowledge
Since its inception, SEL University (SELU) has had one clear purpose—to provide the education and training needed to make electric power safer, more reliable, and more economical.