SEL is an internationally recognized designer and manufacturer of products that protect and control electric power systems worldwide. We are problem solvers, inventors, and doers. At SEL, you can support a mission that truly matters and create a career that maximizes your full potential.

The SEL-751 is the right solution for industrial and utility feeder protection, with conventional/low-energy analog (LEA) current and voltage input support, flexible I/O options, easy mounting, and fast settings. The SEL-751 provides complete protection for radial and looped distribution circuits.

Series-Compensated and Long Lines— Prevent Zone 1 overreach on series-compensated lines with optional logic in the SEL-411L-1. Built-in charging compensation improves the sensitivity and speed of differential protection for long lines.

The SEL-587 Current Differential/Overcurrent Relay provides protection for any two-input apparatus, such as transformers, motors, generators, and reactors. Apply it for differential and overcurrent protection and use event reports for quick post-event analysis.

SEL-411L achieves the highest possible fault location accuracy with a double-ended traveling-wave (TW) algorithm. A dedicated analog-to-digital converter samples currents at 1.5625 MHz and extracts high-frequency content to calculate fault location.

Apr 10, 2025 · Latest Versions SEL Software, Computer Drivers, and Computer Firmware This list is organized by posting date, with the most recently updated sections shown at the top. Each section includes information about one or more of the latest releases.

The SEL-2488 receives Global Navigation Satellite System (GNSS) time signals and distributes precise time via multiple timing outputs, including IRIG-B, the Network Time Protocol (NTP), the Precision Time Protocol (PTP), 10 MHz frequency, and 1 pulse per second (PPS).

Use the SEL-311L Line Current Differential Relay with four-zone distance backup for easy-to-apply, high-speed line protection. Apply subcycle current differential protection with included …

acSELerator QuickSet SEL-5030 Software is a tool for engineers and technicians to quickly and easily configure, commission, and manage devices for power system protection, control, metering, and monitoring.

The SEL-351 Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is ideal for directional overcurrent applications. Optional Mirrored Bits communications and power quality monitoring add flexibility to solutions.