Discover the World's Fastest Transmission Line Relay As the first traveling-wave microprocessor-based relay, the SEL-T400L Time-Domain Line Protection trips four times faster than present-day relays and with unmatched selectivity and security. Through the combination of traveling-wave and incremental quantity protection technologies, faults are cleared faster and you get improved safety, better power system stability, and preserved equipment life. And with just a handful of settings, the SEL-T400L is easy to learn, easy to set, easy to apply. This is transmission line protection, redefined. To learn more, visit www.selinc.com/ViewT400L. SEL-T400L Time-Domain Line Protectionhttp://www.selinc.com/ViewT400L