Square D was founded in 1902 in Detroit, Michigan, by Bryson Dexter Horton and James B. McCarthy as McBride Manufacturing Company, focusing on electrical fuses. By 1908, it became Detroit Fuse and Manufacturing, adopting the iconic “Square D” logo—a “D” in a square—reflecting its Detroit roots.
Renamed Square D in 1917, the company pioneered safety switches and circuit breakers, growing significantly with 18,500 employees and $1.65 billion in sales by 1991. That year, after a competitive 10-week bidding process, French multinational Groupe Schneider S.A. acquired Square D for $2.23 billion, raising its offer from $1.96 billion to $88 per share.
The acquisition, approved by Square D’s board and the U.S. Justice Department, made Schneider Electric the world’s largest electrical distribution equipment manufacturer, integrating Square D’s innovative products into its global energy management portfolio.
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