Electrical Supplies Unlimited (ESU) is a trusted source for Circuit Breakers San Diego, specializing in the testing, repair, rebuilding, and reconditioning of electrical equipment. We maintain an extensive inventory of new, used, surplus, obsolete, and hard-to-find circuit breakers, including Cutler Hammer Breakers San Diego, Siemens, Square D, Eaton, GE, Federal Pacific (FPE), Challenger, and many other leading brands. Our inventory also includes transformers, relays, disconnects, motor controls, switches, panel components, and other electrical distribution equipment for residential, commercial, and industrial applications.

ESU also purchases excess electrical inventory from contractors, facility managers, manufacturers, and electrical distributors throughout Southern California. We actively buy and sell Cutler Hammer Breakers San Diego, including Cutler Hammer 50 Amp breakers, as well as a wide variety of circuit breakers, transformers, fuses, electrical panels, and surplus electrical equipment. If you're looking to purchase Circuit Breakers San Diego or sell surplus electrical inventory, our experienced team can help identify, source, and provide the electrical components you need quickly and competitively.

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!

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 offers San Diego Electricians new & used Circuit Breakers, E Fuses, Switches, Plugs and more for San Diego

Attention electricians and homeowners in San Diego! If you're in need of high-quality electrical supplies, look no further than Electrical Supplies Unlimited (ESU). As your go-to source for all things electrical, ESU specializes in buying, selling, and stocking a wide range of new, surplus, and recycled circuit breakers and panels. Whether you're a professional electrician or a DIY enthusiast, ESU has you covered with a comprehensive selection of products, including 20 Amp thru 125 amp Zinsco breakers, 20 amp through 1200 amp 480 volt Siemens breakers (both 3 phase and single phase), as well as 15 thru 100 amp 120/240 Volt Pushmatic Breakers, and 15 thru 1200 amp 120/240 and 480V Federal Pacific FPE circuit breakers, among many others. With ESU, you can trust that you're getting top-notch electrical supplies to meet your specific needs and requirements. Visit us today and discover why ESU is the preferred choice for electricians and homeowners alike in San Diego.

Are you searching for a reliable electrical supplies company in San Diego? Look no further than Electrical Supplies Unlimited (ESU). As a trusted provider of electrical solutions, ESU offers a comprehensive range of products to meet the needs of electricians and homeowners alike. From circuit breakers to panels, ESU stocks a diverse selection of new, surplus, and recycled items, including 20 Amp thru 125 amp Zinsco breakers, 20 amp through 1200 amp 480 volt Siemens breakers (available in both 3 phase and single phase configurations), as well as 15 thru 100 amp 120/240 Volt Pushmatic Breakers, and 15 thru 1200 amp 120/240 and 480V Federal Pacific FPE circuit breakers, and much more. Whether you're tackling a small repair or a major electrical project, ESU has the supplies you need to get the job done right. Visit us today to explore our extensive inventory and experience the ESU difference for yourself!

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 30 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!

Square D vs Eaton Circuit Breakers: Which Brand Is Better?

When selecting a circuit breaker for a residential or commercial electrical panel, two of the most commonly compared brands are Square D and Eaton. Both manufacturers produce high-quality breakers designed to protect electrical systems from overloads and short circuits. Understanding the differences between these brands can help electricians, contractors, and homeowners choose the right product for their electrical installation.

This guide compares Square D vs Eaton circuit breakers, including compatibility, reliability, pricing, and common applications.

Overview of Square D Circuit Breakers

Square D, a brand of Schneider Electric, is one of the most recognized names in electrical equipment. Square D breakers are widely used in residential homes and commercial buildings throughout North America.

The most common Square D product lines include:

• Square D Homeline – Designed primarily for residential electrical panels
• Square D QO – Premium breakers known for reliability and fast trip response
• Square D PowerPact – Commercial and industrial circuit protection

Square D breakers are known for strong safety performance and wide availability in the electrical supply market.

Overview of Eaton Circuit Breakers

Eaton is another major manufacturer of electrical distribution equipment and circuit protection products. Eaton breakers are used in residential, commercial, and industrial electrical systems around the world.

Common Eaton breaker product lines include:

• Eaton BR – Residential panel breakers
• Eaton CH – Premium residential breakers with copper bus connection
• Eaton Series G – Industrial molded case breakers

Eaton breakers are known for durability and compatibility with many legacy electrical panels.

Square D vs Eaton Breakers: Key Differences

Although both brands perform the same core function, several differences may influence which breaker is best for a particular electrical system.

• Panel Compatibility: Breakers must match the panel brand and model.
• Product Lines: Each manufacturer offers different breaker series designed for specific applications.
• Trip Technology: Premium breakers may include faster trip detection or arc-fault protection.
• Price Range: Costs vary depending on breaker type and amperage rating.

Because breakers are designed to work with specific electrical panels, compatibility is often the most important factor when choosing between brands.

Which Circuit Breaker Brand Is More Reliable?

Both Square D and Eaton are considered highly reliable manufacturers with strong reputations in the electrical industry. Licensed electricians commonly install products from both companies depending on the panel brand and project requirements.

Square D QO breakers are often considered one of the most reliable residential breakers available, while Eaton CH breakers are known for their copper bus design and long-term durability.

Can Square D and Eaton Breakers Be Interchanged?

In most cases, circuit breakers are not interchangeable between different panel brands. Electrical panels are designed to accept specific breaker models that match the bus bar configuration and safety certification.

Installing an incompatible breaker can create safety hazards and may violate electrical code requirements. Always verify compatibility before replacing or installing breakers.

Choosing the Right Breaker for Your Electrical Panel

The best circuit breaker for your system depends on several factors, including panel type, electrical load requirements, and safety features such as GFCI or AFCI protection.

Electricians typically recommend using the breaker brand specified by the panel manufacturer to ensure proper fit and performance.

Learn More About Circuit Breakers

For a complete overview of breaker types, brands, and electrical safety considerations, visit our Circuit Breaker Resource Hub where we provide expert guides for residential, commercial, and industrial electrical systems.

For a complete overview of breaker types, brands, and electrical applications, visit our Circuit Breaker Resource Hub.

More Circuit Breaker Resources

• Circuit Breaker Resource Hub
• How to Choose the Right Circuit Breaker
• Low Voltage Circuit Breakers Explained
• Common Circuit Breaker Brands