World's Fastest Transmission Line Relay!

World's Fastest Transmission Line Relay!

SEL-T400L

Time-Domain Line Protection

Apply the SEL-T400L Time-Domain Line Protection for ultra-high-speed protection of transmission lines. With breakthrough time-domain technologies, the SEL-T400L trips securely in as fast as 1 ms, records events with a 1 MHz sampling rate, and locates faults to the nearest tower. Add the SEL-T400L to your line protection system to dramatically reduce your fault-clearing time, and achieve the many benefits associated with speed.

Learn more about the biggest breakthrough technology since the first microprocessor-based relay in 1984 at the SEL website.