ESU buys and sells new & used Commercial Circuit Breakers in San Diego.

Electrical Supplies Unlimited (ESU) is your trusted source for high-quality commercial circuit breakers, serving businesses and contractors in need of reliable electrical components. While residential breakers are designed for lower voltage applications, such as homes and small buildings, commercial circuit breakers are built for higher capacity electrical systems, typically found in large offices, industrial buildings, and retail spaces. These breakers provide enhanced durability, greater fault protection, and the ability to handle higher electrical loads. At ESU, we carry a wide selection of commercial circuit breakers to meet the needs of your project, ensuring safety and compliance with electrical codes.

Commercial circuit breakers can be challenging to work with, especially when installations require specific supporting hardware. These breakers are typically mounted on panel boards or inside switchgear cabinets, and because equipment designs evolve over time, locating compatible hardware can be tricky. To ensure you get the best match for your system, Electrical Supplies Unlimited recommends bringing photos and measurements of your installed breakers before visiting our San Diego store. With over 40 years of experience in the electrical supply industry, ESU is your trusted partner for commercial circuit breakers in San Diego—offering expert advice, accurate product matching, and outstanding customer service.

Unlike residential circuit breakers that protect homes, commercial circuit breakers are engineered to handle higher voltages and more demanding electrical loads in environments such as office buildings, warehouses, and industrial facilities. These breakers are designed for three-phase systems and provide reliable protection for large-scale applications. At Electrical Supplies Unlimited in San Diego, we stock a wide selection of commercial circuit breakers to suit any requirement. Backed by decades of industry expertise, our team is ready to help you find the right solution at a competitive price. Visit ESU today for the best in commercial circuit breakers and electrical supplies in San Diego.

The simplest circuit protection device is the fuse. A fuse is just a thin wire, enclosed in a casing, that plugs into the circuit. When a circuit is closed, all charge flows through the fuse wire -- the fuse experiences the same current as any other point along the circuit. The fuse is designed to disintegrate when it heats up above a certain level -- if the current climbs too high, it burns up the wire. Destroying the fuse opens the circuit before the excess current can damage the building wiring.

The problem with fuses is they only work once. Every time you blow a fuse, you have to replace it with a new one. A circuit breaker does the same thing as a fuse -- it opens a circuit as soon as current climbs to unsafe levels -- but you can use it over and over again.

The basic circuit breaker consists of a simple switch, connected to either a bimetallic strip or an electromagnet. The diagram below shows a typical electromagnet design.
 

ESU offers San Diego Electricians new & used Electrical Panels, Circuit Breaker panels and more for San Diego

Looking for a reliable source for electrical supplies in San Diego? Look no further than Electrical Supplies Unlimited (ESU). Whether you're an electrician or a homeowner, ESU is your go-to destination for a wide range of electrical panels and circuit breakers. We specialize in buying, selling, and stocking new, surplus, and recycled electrical components to meet your needs. From Zinsco breakers to Siemens breakers in both three-phase and single-phase configurations, as well as Pushmatic breakers and Federal Pacific FPE circuit breakers, we have everything you need to keep your electrical systems running smoothly. Trust ESU for high-quality products, competitive prices, and exceptional customer service. Visit us today and discover why we're the preferred choice for electricians and homeowners alike in San Diego.

Looking for top-quality electrical supplies in San Diego? Electrical Supplies Unlimited (ESU) is your trusted partner for all your electrical panel and circuit breaker needs. Whether you're a professional electrician or a homeowner tackling a DIY project, ESU offers a comprehensive selection of new, surplus, and recycled electrical components to suit your requirements. From renowned brands like Zinsco, Siemens, Pushmatic, and Federal Pacific FPE, we stock a variety of panels and breakers, including three-phase and single-phase options. With our commitment to quality and reliability, you can count on ESU to provide the products you need at competitive prices. Visit us today to explore our extensive inventory and experience the convenience of sourcing your electrical supplies from ESU.

Electricians in San Diego understand the importance of quality electrical supplies to ensure the safety and reliability of their work. That's where Electrical Supplies Unlimited comes in. As the go-to source for electricians and electrical companies in the San Diego area, we offer a wide range of new and used power transformers, circuit breakers, and other essential electrical supplies. Our commitment to providing top-notch products and excellent customer service means that electricians can rely on us for all their needs. Whether you're a seasoned professional or a newcomer to the field, Electrical Supplies Unlimited is here to support you in delivering top-quality electrical solutions to the San Diego community.

Electrical Supplies Unlimited takes pride in being the premier choice for electricians seeking reliable electrical supplies in San Diego. Our extensive inventory includes new and used power transformers, circuit breakers, and various other essential components. We understand that electricians and electrical companies require top-grade equipment to ensure the safety and efficiency of their work, which is why we make it our mission to provide the best products available. With a focus on customer satisfaction and a dedication to quality, Electrical Supplies Unlimited is the trusted partner for electricians throughout San Diego. When you choose us, you're choosing a company that values your success and is committed to delivering the supplies you need to get the job done right.Electrical Supplies Unlimited, known as ESU, stands as the premier destination for electricians in San Diego seeking top-notch electrical components and supplies. With an unwavering commitment to quality and reliability, ESU provides an extensive inventory of essential electrical equipment, including transformers, circuit breakers, panelboards, fuses, and much more. We understand that electricians and electrician companies require dependable products to ensure safety and efficiency in their projects. ESU goes above and beyond to offer a comprehensive range of electrical supplies that meet and exceed industry standards, ensuring that every job is completed with precision and confidence. Our knowledgeable team is dedicated to assisting electricians in finding the right solutions for their specific needs, and our competitive pricing ensures that quality doesn't come at a premium. When it comes to electrical supplies in San Diego, ESU is the trusted partner that electricians rely on for excellence and reliability.

At ESU, we recognize the critical role that electricians play in powering San Diego's communities and businesses. That's why we've made it our mission to provide them with the highest quality electrical supplies and components available in the market. From transformers that facilitate power distribution to circuit breakers that safeguard against electrical overloads, we offer a wide selection of products that cater to the diverse requirements of electricians and electrician companies in San Diego. Our commitment to delivering not just products, but solutions, is evident in our customer-centric approach and the expert guidance we offer to ensure that each electrician can perform their work efficiently and safely. When it comes to electrical supplies, ESU is the trusted partner that powers the success of San Diego's electricians, one reliable component at a time.

ESU Inc has been in the electrical supply business for over 40 years. We have a large inventory of new, surplus and recycled electrical supplies both for the commercial and residential markets. We are a fully stocked Electrical Distributor and Electrical Wholesaler with many different lines in stock. We specialize in  hard to find items. Our staff is very knowledgeable and our mission is to ensure that our customers expectations are exceeded. Ask around, our reputation is what makes us! Or just call to find out yourself at 858.558.2850.

We stock most major brands including General Electric, Hammond Power, ITE Siemens, Cutler Hammer, Square D, FPE Federal Pacific, Pushmatic, Zinsco, Crouse Hinds, Challenger, Westinghouse, Sylvania, and Bryant.

Our inventory consists of a large selection of Circuit Breakers, Transformers, Disconnects, Panelboards to 600v, Fuses up to 3000 Amps, Bolt Switch Pullouts, Motor Starters and Relays, Meter sockets, Lighting ballasts, Metal Halide and Sox bulbs. We also carry Lithonia Commercial and residential lighting fixtures as well.

Our Products ESU sells a large and diverse inventory of Electrical Supplies, Electrical Equipment, including Circuit Breakers, Fuses, Transformers, Panelboard switches, Safety switches, Fuseable switches, Meter Sockets, Motor Controllers, Lighting  Ballasts, Bolt switch and much more. We carrier almost all manufacturers including Zinsco, Pushmatic, FPE Federal Pacific, ITE Siemens,  Cutler Hammer, Lutron, Lithonia,, Square D, Challenger and many more. We serve the San Diego and SD County areas and to many other intra and interstate clients. We sell products to fit any requirement or budget. ESU rents Greenlee Wire Pullers, Conduit benders as well as other electrician tools. Talk directly to one of our specialists, Ed, Scott, Kevin or Chris to find out more. So give us a call today at 858.558.2850 and let us serve you

Circuit Breakers Electrical Supplies Unlimited buys and sells new and used Circuit Breakers and more for San Diego County and surrounding areas including Linda Vista, Hillcrest, Kearney Mesa, Clairemont, University City and more. Of course, we can arrange shipment on a wide variety of products to service those outside our area. We will also purchase your used Transformers.

We purchase most major brands including Acme, Westinghouse, Cutler Hammer, ITE Siemens, FPE  Federal Pacific, Square D, General Electric and Zinsco products. We are a fully stocked Electrical Distributor and Electrical Wholesaler with many different lines in stock.

Circuit Breakers Electrical Supplies Unlimited is your go-to source for Circuit Breaker electrical supplies in San Diego and surrounding areas. We have a large inventory of most brands of circuit breakers including most amperages and voltages. 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 carry most amperages and voltages. Some examples of what we carry:

20 Amp thru 125 amp Zinsco breakers
20 amp through 1200 amp 480 volt Siemens breakers 3 phase and single phase
15 thru 100 amp 120/240 Volt Pushmatic Breakers
15 thru 1200 amp 120/240 and 480V Federal Pacific FPE circuit breakers

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.

Your one stop go to guys. Always at your service!

ESU will purchase your excess electrical inventory including Cutler Hammer 50A breakers. We buy and sell most circuit breakers, transformers, new and used and fuses. 

Electrical 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.

Featured Breaker: Cutler Hammer 50A Industrial Circuit Breaker

Manufacturer: Cutler Hammer 

Industrial Circuit Breaker

50A

600V max 250V c.d. Max

Cat. FD3050L

Suitable for use on

Single Phase AC circuits

Welcome to Electrical Supplies Unlimited, your premier source for used and surplus Cutler Hammer Circuit Breakers across San Diego, Orange, and Riverside Counties. With over 40 years of experience in the industry, we have built a solid reputation for reliability, expertise, and customer satisfaction. Our extensive inventory includes a wide range of high-quality Cutler Hammer Circuit Breakers, ensuring that you find the perfect fit for your electrical needs. Whether you're managing a large commercial project or a small residential upgrade, Electrical Supplies Unlimited provides top-tier products at competitive prices, backed by decades of industry knowledge and exceptional service.

At Electrical Supplies Unlimited, we are dedicated to providing sustainable solutions by buying used and surplus Cutler Hammer Circuit Breakers. This initiative not only supports eco-friendly practices but also offers our clients affordable options without compromising on quality. Our commitment to excellence and customer service has made us a trusted name in the electrical supplies industry throughout San Diego, Orange, and Riverside Counties. Explore our vast selection and experience the convenience and reliability that come with partnering with a company that has been a cornerstone of the community for over four decades. Trust Electrical Supplies Unlimited for all your electrical supply needs and benefit from our unmatched expertise and dedication.

We have been in the electrical supply business for over 40 years and offer fair prices for your excess electrical inventory. Call us today to find out more or request a quote here!