Square D is a company that produces electrical equipment and systems for a range of industries, including industrial, commercial, and residential. The company was founded in 1903 by two electrical engineers, Theodore Square and Arthur Doughty, and it was initially focused on the development of a patented circuit breaker.
Today, Square D is a brand owned by Schneider Electric, a global energy management and automation company. Square D products include circuit breakers, switches, transformers, panelboards, and other electrical distribution equipment. The company also provides a range of electrical safety and power management solutions.