Circuit Breakers in Otay, San Diego! ESU buys and sells new & used Breakers and Panels!

Electrical Supplies Unlimited buys and sells new & used Circuit Breakers Otay  San Diego surrounding areas including University Heights, Hillcrest, Golden Hill, Bankers Hill, Linda Vista and many more. Of course, we can arrange shipment on a wide variety of products to service those outside our area. We will also buy your used Transformers.

ESU Inc has proudly served the electrical supply industry for more than 40 years. We carry a wide selection of new, surplus, and recycled electrical supplies for both residential and commercial needs. As a fully stocked Electrical Distributor and Wholesaler, we maintain many different product lines on hand. We specialize in locating hard-to-find items, and our experienced staff is committed to going above and beyond customer expectations. Our reputation speaks for itself—just ask around, or give us a call at 858.558.2850 to experience it firsthand.

Our inventory includes most leading brands such as 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 sells and buys both new and used Circuit Breakers, serving Otay, San Diego and nearby areas such asUniversity Heights, Hillcrest, Golden Hill, Bankers Hill, Linda Vista, and more. We can also arrange shipment of many products to serve customers outside the region. In addition, we will purchase your used Transformers.

We handle most of the major brands, including Westinghouse, Acme, Cutler Hammer, ITE Siemens, Federal Pacific (FPE), Square D, General Electric, and Zinsco. As a fully stocked Electrical Distributor and Wholesaler, we keep many different product lines readily available.

Electrical Supplies Unlimited is San Diego’s go-to source for Circuit Breaker electrical supplies. Our inventory includes a wide range of circuit breakers across most voltages and amperages. In our San Diego store, we carry products from many manufacturers such as Zinsco, Federal Pacific (FPE), Pushmatic, Bulldog, Cutler Hammer, ITE Siemens, Square D, and more. We stock most amperages and voltages. Some examples of what we offer:

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!

Circuit Breakers in University Heights, San Diego! ESU buys and sells new & used Breakers and Panels!

Electrical Supplies Unlimited buys and sells new & used Circuit Breakers university Heights  San Diego surrounding areas including Hillcrest, Golden Hill, Bankers Hill, Linda Vista and many more. Of course, we can arrange shipment on a wide variety of products to service those outside our area. We will also buy your used Transformers.

ESU Inc has proudly served the electrical supply industry for more than 40 years. We carry a wide selection of new, surplus, and recycled electrical supplies for both residential and commercial needs. As a fully stocked Electrical Distributor and Wholesaler, we maintain many different product lines on hand. We specialize in locating hard-to-find items, and our experienced staff is committed to going above and beyond customer expectations. Our reputation speaks for itself—just ask around, or give us a call at 858.558.2850 to experience it firsthand.

Our inventory includes most leading brands such as 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 sells and buys both new and used Circuit Breakers, serving University Heights, San Diego and nearby areas such as Hillcrest, Golden Hill, Bankers Hill, Linda Vista, and more. We can also arrange shipment of many products to serve customers outside the region. In addition, we will purchase your used Transformers.

We handle most of the major brands, including Westinghouse, Acme, Cutler Hammer, ITE Siemens, Federal Pacific (FPE), Square D, General Electric, and Zinsco. As a fully stocked Electrical Distributor and Wholesaler, we keep many different product lines readily available.

Electrical Supplies Unlimited is San Diego’s go-to source for Circuit Breaker electrical supplies. Our inventory includes a wide range of circuit breakers across most voltages and amperages. In our San Diego store, we carry products from many manufacturers such as Zinsco, Federal Pacific (FPE), Pushmatic, Bulldog, Cutler Hammer, ITE Siemens, Square D, and more. We stock most amperages and voltages. Some examples of what we offer:

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!

Obsolete Circuit Breakers: Finding Replacement Breakers for Older Electrical Panels

Finding obsolete circuit breakers can be challenging, especially when dealing with older electrical panels that are no longer manufactured. Many homes, commercial buildings, and industrial facilities still rely on discontinued breaker systems, making replacement parts difficult to locate through traditional electrical supply channels.

Fortunately, many obsolete circuit breakers are still available through specialty electrical suppliers. Understanding your options can help you maintain electrical safety, avoid costly downtime, and extend the life of your electrical system.

What Are Obsolete Circuit Breakers?

Obsolete circuit breakers are breakers that are no longer manufactured by the original company. Although production may have ended years ago, many of these breakers remain in service throughout homes, office buildings, apartment complexes, manufacturing facilities, and commercial properties.

In many cases, replacement breakers are still available as new surplus, reconditioned, or professionally tested used inventory.

Common Obsolete Circuit Breaker Brands

Some of the most frequently requested obsolete circuit breaker brands include:

• Federal Pacific (FPE)
• Zinsco
• Challenger
• Pushmatic
• Bulldog
• Bryant
• Westinghouse
• Sylvania
• ITE Legacy Models
• Crouse-Hinds

Many of these systems were installed decades ago and continue operating today, creating ongoing demand for replacement breakers and panel components.

Why Obsolete Breakers Are Still Needed

Replacing an entire electrical panel is not always practical or immediately necessary. Property owners often seek obsolete breakers when:

• A single breaker has failed
• Additional circuits are needed
• A tenant improvement project is underway
• Equipment maintenance requires breaker replacement
• A matching breaker is required for an existing panel

Locating the correct replacement breaker can often save significant time and expense compared to a complete panel replacement.

Federal Pacific (FPE) Breakers

Federal Pacific Electric (FPE) breakers are among the most commonly requested obsolete circuit breakers. While many FPE panels remain in service, replacement breakers can be difficult to locate through standard electrical distributors.

Property owners frequently search for replacement FPE Stab-Lok breakers when maintaining older electrical systems.

Learn more in our guide on Replacing FPE, Zinsco, and Challenger Breakers.

Zinsco Circuit Breakers

Zinsco electrical panels were widely installed throughout the United States and are still found in many older residential and commercial properties. Because original Zinsco equipment is no longer manufactured, replacement breakers often require sourcing from specialty electrical suppliers.

Electrical contractors frequently encounter Zinsco systems during remodeling, panel upgrades, and electrical inspections.

Challenger Circuit Breakers

Challenger breakers remain common in many buildings constructed during the 1980s and 1990s. While some Challenger products were later absorbed into other product lines, finding exact replacement breakers often requires access to surplus or obsolete inventory.

Many electricians seek Challenger replacements when repairing existing electrical systems or upgrading service equipment.

When Should an Obsolete Breaker Be Replaced?

Circuit breakers should be replaced whenever they show signs of failure or damage. Common warning signs include:

• Frequent tripping
• Burn marks or discoloration
• Overheating
• Physical damage
• Breaker will not reset
• Loose connection to the panel

If you notice any of these symptoms, review our guide on Signs of a Bad Circuit Breaker.

Should You Replace the Breaker or Upgrade the Entire Panel?

In some situations, replacing a single obsolete breaker is the most practical solution. In others, a complete electrical panel upgrade may offer greater safety, capacity, and long-term reliability.

Factors to consider include:

• Age of the electrical panel
• Availability of replacement breakers
• Current electrical demand
• Future expansion plans
• Overall condition of the system

Learn more in our guide on When to Upgrade Your Electrical Panel.

Finding Obsolete Circuit Breakers in San Diego

Electrical Supplies Unlimited specializes in locating new, used, surplus, and obsolete circuit breakers throughout San Diego County. Our inventory includes hard-to-find breakers, discontinued models, legacy panel components, and replacement electrical equipment for residential, commercial, and industrial applications.

We help contractors, electricians, property managers, and facility maintenance professionals locate difficult-to-find breakers quickly and efficiently.

Why Choose ESU for Obsolete Circuit Breakers?

With over 40 years of experience serving the electrical industry, ESU has built a reputation as one of San Diego's trusted sources for obsolete electrical equipment. Our extensive inventory and product knowledge allow us to help customers locate replacement breakers that many suppliers no longer carry.

Whether you need a discontinued FPE breaker, Zinsco replacement, Challenger breaker, or another hard-to-find model, our team can help identify the correct solution.

More Circuit Breaker Resources

• Circuit Breaker Resource Hub
• Circuit Breakers San Diego
• Circuit Breaker Replacement Guide
• Replacing FPE, Zinsco, and Challenger Breakers
• Signs of a Bad Circuit Breaker
• Buy Circuit Breakers San Diego

Circuit Breakers in Bankers Hill, San Diego! ESU buys and sells new & used Breakers and Panels!

Electrical Supplies Unlimited buys and sells new & used Circuit Breakers Bankers Hill  San Diego surrounding areas including University Heights, Hillcrest, Golden Hill, Linda Vista and many more. Of course, we can arrange shipment on a wide variety of products to service those outside our area. We will also buy your used Transformers.

ESU Inc has proudly served the electrical supply industry for more than 40 years. We carry a wide selection of new, surplus, and recycled electrical supplies for both residential and commercial needs. As a fully stocked Electrical Distributor and Wholesaler, we maintain many different product lines on hand. We specialize in locating hard-to-find items, and our experienced staff is committed to going above and beyond customer expectations. Our reputation speaks for itself—just ask around, or give us a call at 858.558.2850 to experience it firsthand.

Our inventory includes most leading brands such as 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 sells and buys both new and used Circuit Breakers, serving Circuit Breakers Bankers Hill, San Diego and nearby areas such as Hillcrest, Golden Hill, Linda Vista, and more. We can also arrange shipment of many products to serve customers outside the region. In addition, we will purchase your used Transformers.

We handle most of the major brands, including Westinghouse, Acme, Cutler Hammer, ITE Siemens, Federal Pacific (FPE), Square D, General Electric, and Zinsco. As a fully stocked Electrical Distributor and Wholesaler, we keep many different product lines readily available.

Electrical Supplies Unlimited is San Diego’s go-to source for Circuit Breaker electrical supplies. Our inventory includes a wide range of circuit breakers across most voltages and amperages. In our San Diego store, we carry products from many manufacturers such as Zinsco, Federal Pacific (FPE), Pushmatic, Bulldog, Cutler Hammer, ITE Siemens, Square D, and more. We stock most amperages and voltages. Some examples of what we offer:

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!