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 …

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, …

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 …

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 …

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 …

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 …

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), …

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, …

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 …