Schweitzer Engineering Laboratories Private Limited (SEL) invents, designs, and builds digital products and systems that protect, automate, and control critical electric power infrastructure. The company's technical domains span digital protective relays, power system protection, automation, control, and monitoring. Its founder invented the first microprocessor-based digital protective relay, which provided reliable transmission line protection at a fraction of the cost of traditional electromechanical relays.
SEL serves customers in more than 170 countries and operates over 100 offices worldwide, with five manufacturing centres in the United States and its headquarters in Pullman, Washington. The company works across the electric power infrastructure, utilities, and industrial sectors.
The firm is 100 percent employee-owned, with over 7,000 employee owners. This structure underpins a culture of shared ownership that prioritises long-term customer value over short-term financial results. SEL offers a ten-year worldwide warranty and maintains a commitment to quality, integrity, and customer service, supported by what it describes as unmatched technical support.
