Products

With breakthrough time-domain technologies, the SEL-T400L Time-Domain Line Protection trips in as fast as 1 millisecond, records events with 1 MHz sampling, and locates faults accurately to the nearest tower with single- and double-ended traveling-wave fault locators.

Apply the SEL-311C Relay for complete protection, monitoring, and control of transmission lines.

Use the SEL-311L Relay with integral four-zone distance backup for easy-to-apply, high-speed line protection.

The SEL-321 Relay delivers outstanding EHV protection, performance, and features—at a price practical for all voltage levels and with the features you need for system integration.

Select the SEL-321-5 for 50 Hz applications requiring enhanced single-pole tripping, phase and ground distance, directional overcurrent, and negative-sequence protection.

Use SEL-387L Line Current Differential Relays for economical, easy-to-apply line protection.

With comprehensive distance and differential protection the SEL-411L allows you to stock one relay for all transmission lines. The SEL-411L is also the only relay with traveling-wave fault location which pinpoints faults to the nearest tower or span.

Protect transmission lines with high-speed distance and directional functions.