Circuit Breakers - Buy, Sell, New, Used, Stock

Welcome to Electrical Supplies Unlimited (ESU Inc), your trusted partner in the electrical supply industry for over four decades. Established 40 years ago, ESU has consistently delivered top-notch electrical products and services, earning a reputation for reliability and excellence. Our commitment to quality has made us the go-to choice for electricians in San Diego who rely on our extensive inventory of premium electrical supplies.

We have a large inventory of most brands of circuit breakers. We carry a large variety of manufacturers, including Zinsco, Federal Pacific FPE, Pushmatic, Bulldog, Cutler, Hammer, ITE Siemens, Square D etc. in our San Diego store.  We are circuit breakers and electrical hardware experts. Do not hesitate to call us at 858.558.2850 to find out which Circuit Breaker is right for your requirement.

used circuit breakerElectrical Supplies Unlimited is your company's business source for testing, repairing, rebuilding or reconditioning electrical equipment. ESU maintains a wide variety of out of stock circuit breakers, relays, transformers, switches, relays, motor controls, and other electrical equipment. ESU will also purchase your excess electrical inventory. We also buy new and used transformers. Call us today to find out more! Some merchandise may be available as used or surplus, just call one of our representatives to find out more!

ESU has been a trusted partner in electrical supplies for over 40 years! As a seasoned industry leader, we pride ourselves on a vast inventory featuring new, surplus, and recycled electrical supplies catering to both commercial and residential markets. At ESU, we specialize in sourcing even the most obsolete and hard-to-find items, ensuring our clients in San Diego have access to the broadest range of products. Our commitment to quality and sustainability sets us apart, making ESU the go-to choice for those seeking reliable electrical solutions. Explore our extensive inventory and experience the assurance that comes with four decades of expertise in delivering top-notch electrical supplies to meet every need.

At ESU Inc, we understand the dynamic nature of the electrical business, and we take pride in adapting to the evolving needs of our customers. Our dedicated team is equipped with the knowledge and experience to provide tailored solutions that meet the unique requirements of electricians in San Diego. In addition to our vast product range, we are excited to announce that ESU is now actively purchasing excess circuit breaker inventory. If you have surplus circuit breakers, trust ESU to offer competitive rates and seamless transactions. Join the growing community of satisfied customers who have made ESU Inc their first choice for all their electrical supply needs in San Diego and beyond.

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.