
Electrical Supplies Unlimited (ESU) is your trusted source for Circuit Breakers in University Heights San Diego, serving contractors, electricians, property managers, and homeowners throughout University Heights and surrounding communities including University City, Hillcrest, Golden Hill, Bankers Hill, and greater San Diego County.
We buy and sell both new and used circuit breakers, electrical panels, transformers, and electrical equipment. Whether you need replacement breakers, obsolete breakers, or hard-to-find electrical components, ESU provides dependable solutions backed by over 40 years of industry experience.
ESU has proudly served the San Diego electrical supply industry for more than four decades. As a fully stocked electrical distributor and wholesaler, we carry a wide range of residential, commercial, and industrial electrical supplies designed to meet virtually any project requirement.
Our experienced team specializes in locating discontinued, surplus, and specialty electrical products, helping customers source reliable solutions quickly and efficiently.
Our extensive inventory includes major circuit breaker manufacturers and trusted industry brands, including:
General Electric (GE), Siemens / ITE, Cutler Hammer, Square D, Federal Pacific (FPE), Pushmatic, Zinsco, Challenger, Bryant, Westinghouse, Sylvania, Crouse Hinds, Bulldog, and many more.
In addition to circuit breakers, ESU stocks a large inventory of:
We also offer Greenlee tool rentals, conduit benders, wire pullers, and additional electrician equipment for contractors throughout San Diego County.
ESU is San Diego’s go-to source for new, used, surplus, and obsolete circuit breakers. We carry a broad range of amperages and voltages for nearly every major electrical system.
Examples of our inventory include:
Whether you need residential breaker replacements, commercial electrical upgrades, or industrial breaker solutions, our knowledgeable staff can help you select the right product for your project.
We proudly provide circuit breakers and electrical supplies throughout:
We also ship many products nationwide for customers outside the San Diego region.
At Electrical Supplies Unlimited, we combine decades of electrical supply expertise with one of the region’s most diverse inventories of circuit breakers and electrical equipment.
Whether you’re replacing outdated breakers, sourcing specialty equipment, or upgrading electrical infrastructure, ESU delivers dependable products, expert guidance, and exceptional customer service.
Call ESU today at 858.558.2850 to speak directly with one of our electrical supply specialists and find the right circuit breaker or electrical solution for your needs.
Circuit Breakers Mira Mesa San DiegoElectrical Supplies Unlimited (ESU) is your trusted source for Circuit Breakers in Del Mar San Diego, serving contractors, electricians, property managers, and homeowners throughout Bay Ho and surrounding communities including La Jolla, Sorento Valley, Hillcrest, Golden Hill, Bankers Hill, and greater San Diego County.
We buy and sell both new and used circuit breakers, electrical panels, transformers, and electrical equipment. Whether you need replacement breakers, obsolete breakers, or hard-to-find electrical components, ESU provides dependable solutions backed by over 40 years of industry experience.
ESU has proudly served the San Diego electrical supply industry for more than four decades. As a fully stocked electrical distributor and wholesaler, we carry a wide range of residential, commercial, and industrial electrical supplies designed to meet virtually any project requirement.
Our experienced team specializes in locating discontinued, surplus, and specialty electrical products, helping customers source reliable solutions quickly and efficiently.
Our extensive inventory includes major circuit breaker manufacturers and trusted industry brands, including:
General Electric (GE), Siemens / ITE, Cutler Hammer, Square D, Federal Pacific (FPE), Pushmatic, Zinsco, Challenger, Bryant, Westinghouse, Sylvania, Crouse Hinds, Bulldog, and many more.
In addition to circuit breakers, ESU stocks a large inventory of:
We also offer Greenlee tool rentals, conduit benders, wire pullers, and additional electrician equipment for contractors throughout San Diego County.
ESU is San Diego’s go-to source for new, used, surplus, and obsolete circuit breakers. We carry a broad range of amperages and voltages for nearly every major electrical system.
Examples of our inventory include:
Whether you need residential breaker replacements, commercial electrical upgrades, or industrial breaker solutions, our knowledgeable staff can help you select the right product for your project.
We proudly provide circuit breakers and electrical supplies throughout:
We also ship many products nationwide for customers outside the San Diego region.
At Electrical Supplies Unlimited, we combine decades of electrical supply expertise with one of the region’s most diverse inventories of circuit breakers and electrical equipment.
Whether you’re replacing outdated breakers, sourcing specialty equipment, or upgrading electrical infrastructure, ESU delivers dependable products, expert guidance, and exceptional customer service.
Call ESU today at 858.558.2850 to speak directly with one of our electrical supply specialists and find the right circuit breaker or electrical solution for your needs.
Finding obsolete circuit breakers can be difficult, especially when dealing with discontinued electrical panels or older electrical systems. Electrical Supplies Unlimited (ESU) specializes in helping contractors, electricians, facility managers, and homeowners locate obsolete circuit breakers in San Diego for residential, commercial, and industrial applications.
With over 40 years of experience and one of Southern California's largest inventories of electrical equipment, ESU is a trusted source for replacement breakers that many suppliers no longer stock.
Why Obsolete Circuit Breakers Are Still in DemandMany electrical panels remain in service long after manufacturers discontinue production. When a breaker fails, property owners often need an exact replacement to maintain safe operation without replacing the entire electrical panel.
Common reasons customers search for obsolete breakers include:
ESU frequently helps customers locate breakers from manufacturers that are no longer widely available.
Inventory changes regularly, but our experienced staff can often help locate difficult-to-find models or compatible replacement solutions.
In many situations, replacing a single breaker is the most cost-effective solution. However, older electrical systems may benefit from a complete panel upgrade if the panel has reached the end of its service life.
Factors to consider include panel age, overall condition, future electrical demands, and the availability of replacement components.
Learn more in our guide on When to Upgrade Your Electrical Panel.
Electrical contractors throughout San Diego rely on ESU to source obsolete circuit breakers quickly. We work with electricians, property managers, maintenance departments, and commercial facilities to help minimize downtime and keep electrical systems operating safely.
Whether you're working on a residential service upgrade or a commercial electrical project, we can help identify the correct breaker for your application.
Our team understands obsolete electrical equipment and can often help locate replacement breakers that are difficult to find through traditional supply channels.
If you're searching for an obsolete circuit breaker in San Diego, contact Electrical Supplies Unlimited today. Our experienced team can help identify the correct breaker, verify compatibility, and locate hard-to-find electrical equipment for your project.
Circuit Breakers Sorrento Valley San Diego – New & Used Breakers, Panels & Electrical SuppliesElectrical Supplies Unlimited (ESU) is a trusted supplier of Circuit Breakers in Sorrento Valley San Diego, serving contractors, electricians, commercial facilities, industrial clients, and homeowners throughout Sorrento Valley, Mira Mesa, Torrey Pines, UTC, La Jolla, and surrounding San Diego communities.
We buy and sell both new and used circuit breakers, electrical panels, transformers, and hard-to-find electrical components. Whether you need replacement breakers, obsolete equipment, or surplus electrical inventory, ESU provides dependable products backed by over 40 years of experience in the San Diego electrical supply industry.
ESU has proudly served San Diego County for more than four decades as a fully stocked electrical distributor and wholesaler. We maintain a large inventory of residential, commercial, and industrial electrical supplies to meet nearly any project size or requirement.
Our experienced team specializes in sourcing discontinued, surplus, and specialty electrical products, helping customers locate difficult-to-find circuit breakers and components quickly.
Our extensive inventory includes leading electrical manufacturers and breaker brands, including:
Siemens / ITE, General Electric (GE), Cutler Hammer, Square D, Federal Pacific (FPE), Pushmatic, Zinsco, Challenger, Bryant, Bulldog, Westinghouse, Sylvania, Crouse Hinds, Hammond Power, and many more.
ESU offers a wide variety of electrical products beyond circuit breakers, including:
We also provide Greenlee tool rentals, conduit benders, wire pullers, and other electrician tools for projects throughout Sorrento Valley and greater San Diego.
ESU is one of San Diego’s premier suppliers of new, used, surplus, and obsolete circuit breakers. Our inventory includes a broad range of amperages, voltages, and breaker types suitable for residential, commercial, and industrial electrical systems.
Sample inventory includes:
Whether you are upgrading office space, replacing outdated industrial components, or sourcing specialty breakers for commercial systems, our team can help identify the right solution.
We proudly serve customers throughout:
We also arrange shipping nationwide for customers outside the San Diego region.
Electrical Supplies Unlimited combines decades of expertise with one of Southern California’s most diverse inventories of circuit breakers, electrical panels, transformers, and electrical equipment.
Whether you need electrical upgrades, breaker replacements, industrial electrical solutions, or hard-to-find surplus products, ESU is your dependable source for circuit breakers in Sorrento Valley San Diego.
Call 858.558.2850 today to speak directly with one of our electrical supply specialists and find the right breaker, panel, or electrical supply solution for your needs.
If your circuit breaker is not resetting, it is usually a sign of an underlying electrical problem that needs attention. A breaker that immediately trips again, feels loose, or refuses to stay in the ON position may indicate an overloaded circuit, short circuit, ground fault, or a defective breaker.
Understanding why a circuit breaker will not reset can help you identify potential safety hazards and determine whether you need a simple repair, breaker replacement, or a larger electrical upgrade.
Why Is My Circuit Breaker Not Resetting?Circuit breakers are designed to shut off power when they detect dangerous conditions such as overloads or short circuits. If the underlying issue still exists, the breaker may refuse to reset in order to protect your electrical system.
In some cases, the breaker itself may be worn out or damaged and require replacement.
Many people do not realize that a tripped breaker must first be switched completely to the OFF position before it can be reset.
To properly reset a breaker:
If the breaker immediately trips again, further troubleshooting is required.
One of the most common causes of a breaker that will not reset is an overloaded circuit. Too many devices operating on the same circuit can exceed the breaker's rated capacity.
Try unplugging appliances, electronics, and equipment connected to the affected circuit before attempting to reset the breaker again.
If overloading is a recurring problem, you may need additional circuits or an electrical panel upgrade.
A short circuit occurs when electrical current follows an unintended path with little resistance. Short circuits can generate significant heat and may cause the breaker to trip instantly.
Signs of a possible short circuit include:
Short circuits should be investigated immediately to prevent potential fire hazards.
Ground faults are especially common in kitchens, bathrooms, garages, outdoor circuits, and areas exposed to moisture. Ground fault conditions can cause both standard breakers and GFCI circuit breakers to trip.
If moisture or damaged wiring is present, the breaker may continue tripping until the fault is corrected.
Like any electrical component, circuit breakers can wear out over time. Older breakers may become weak, fail internally, or lose their ability to properly reset.
Common signs of a bad breaker include:
Learn more in our guide on Signs of a Bad Circuit Breaker.
If troubleshooting confirms that the breaker itself is defective, replacement is often the safest solution. Modern breakers provide improved reliability and protection compared to aging or obsolete models.
Read our complete Circuit Breaker Replacement Guide to learn more about selecting the correct replacement breaker.
Some older electrical panels may have recurring breaker problems because the panel itself is outdated or operating beyond its intended capacity.
Common older breaker systems include Federal Pacific (FPE), Zinsco, Challenger, and Pushmatic panels. These systems are frequently upgraded due to safety concerns and replacement part availability.
Learn more in our guide on Replacing FPE, Zinsco, and Challenger Breakers.
If your breakers trip frequently, your panel is full, or your electrical needs have increased significantly, it may be time for a panel upgrade.
Modern homes often require additional capacity for HVAC systems, electric vehicle chargers, home offices, and other high-demand electrical equipment.
Learn more in our guide on When to Upgrade Your Electrical Panel.
Electrical Supplies Unlimited carries a large inventory of new, used, surplus, and obsolete circuit breakers for residential, commercial, and industrial applications. We stock products from many major manufacturers and can help locate difficult-to-find replacement breakers.
Whether you need a standard residential breaker, specialty commercial breaker, or replacement for an older electrical panel, our experienced staff can help you find the right solution.