SEL provides complete power system protection, control, monitoring, automation, and integration for utilities and industries worldwide. SEL products, systems, services, and training make electric power safer, more reliable, and more economical.

SEL invents, designs, and builds digital products and systems that protect, automate, and control critical infrastructure around the world. This technology prevents blackouts and enables customers to improve power system reliability, safety, and cost.

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.

SEL designs, manufactures, tests, and delivers custom protection, control, and metering panels as well as control cabinets and retrofit doors. SEL panels are supported by an unmatched warranty and extraordinary customer service. Panels, cabinets, and doors are built to match customer specifications and needs.

SEL University trains power system engineers, technicians, and managers to meet their immediate and long-term workforce training needs. Our experienced instructors and instructional designers create courses that cover topics ranging from fundamental power system principles to hands-on SEL product application and testing.

Follow SEL's journey from the first microprocessor-based relay invented in 1982 to our continued innovation on the cutting edge of power system protection. Our History Innovation is the heart of SEL.

The SEL-751 Feeder Protection Relay is ideal for directional overcurrent, fault location, arc-flash detection, and high-impedance fault detection applications.

At SEL, we encourage all employees to be inventors. When we have ideas, we share them. We work together to evaluate our ideas and develop them into products, solutions, and services that offer unmatched value to customers.

SEL proporciona protección completa, control, monitoreo, automatización e integración de sistemas de potencia para empresas suministradoras de energía e industrias de todo el mundo. Los productos, los sistemas, los servicios y la capacitación de SEL hacen que la energía eléctrica sea más segura, más confiable y más económica.

The SEL-2731 is a Rapid Spanning Tree Protocol (RSTP) or operational technology (OT) software-defined networking (SDN) managed Ethernet switch that is optimized for OT environments, supporting critical infrastructure applications—including IEC 61850 networks, protection-class Ethernet networks, engineering access, SCADA, and process control ...