Schweitzer Engineering Laboratories, Inc. (SEL) is a prominent manufacturer of products and services for the protection, monitoring, control, automation, and metering of electric power systems. Founded in 1984 by Dr. Edmund O. Schweitzer, III, the company is headquartered in Pullman, Washington. SEL is widely recognized for its role in the development of the first digital protective relay, a breakthrough that transformed the electric utility industry by replacing traditional electromechanical relays with microprocessor-based technology.
The company remains employee-owned and is known for its commitment to research, development, and manufacturing within the United States. SEL has grown from a small startup into a global organization, providing solutions that help ensure the reliability and security of the electrical grid. Their business model emphasizes long-term product support, often maintaining availability for legacy equipment long after initial release.
SEL’s product portfolio is focused on power system infrastructure. Key product groups include:
The primary sector for SEL products is the electric utility industry, including generation, transmission, and distribution companies. Additionally, their equipment is utilized in:
SEL operates in a specialized market for power system protection and control. Companies that provide similar equipment include:
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