Square D is an American manufacturer of equipment used to control and distribute electric power headquartered in Palatine, Illinois. Square D was founded in 1903 in Detroit, Michigan as Detroit Fuse and Manufacturing by Bryson Dexter Horton who is credited with the invention of the safety switch which encased high voltage switches and started the company's main line of business of circuit breakers and encased control panels.
Electrical Power Surplus is not an authorized distibutor for Square D Electric.
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