Square D Electrical Supplies Switchgear, Contactors and Motor Starters

Square D is an American manufacturer of equipment used to control and distribute electric power. They are headquartered in Palatine, Illinois.

Square D was founded in 1903 in Detroit, Michigan 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.

We carry a large and diverse inventory of Square D products, including  Circuit Breakers, Transformers, Meter Sections, Disconnects, Panel Board Switches, Switchgear, Contactors and Motor Starters. Contact one of our representatives today at 858.558.2850 to find out more!

Welcome to Electrical Supplies Unlimited (ESU), your trusted source for new, surplus, and recycled electrical equipment, including Square D Electrical Supplies, serving electricians and homeowners across San Diego, Orange, and Riverside Counties. With over 40 years of experience, ESU has been a cornerstone in the industry, providing top-quality products and exceptional service to meet the needs of our valued customers. Whether you're a professional electrician seeking reliable supplies for your projects or a homeowner looking to upgrade your electrical systems, ESU has you covered. Our extensive inventory ensures that you'll find everything you need, from circuit breakers to panelboards, to keep your electrical systems running smoothly and safely. Experience the reliability and expertise that ESU brings to every transaction, and let us be your partner in powering your projects to success.

For over four decades, Electrical Supplies Unlimited (ESU) has been the go-to destination for electricians and homeowners alike, offering a comprehensive selection of electrical equipment, including Square D Electrical Supplies, throughout San Diego, Orange, and Riverside Counties. As a trusted name in the industry, ESU prides itself on delivering top-notch products and unmatched service to our loyal customers. Whether you're in need of new, surplus, or recycled electrical equipment, we have the expertise and inventory to fulfill your requirements. With ESU, you can trust that you're getting quality products backed by decades of experience and a commitment to customer satisfaction. Explore our extensive catalog today and discover why ESU has been the preferred choice for electrical supplies in the region for over 40 years.