If your circuit breaker keeps tripping, it is usually a sign that your electrical system is trying to protect itself from an overload, short circuit, or ground fault. Understanding the common causes of tripping circuit breakers can help you identify whether the issue is minor or a sign of a larger electrical problem.
In many San Diego homes, circuit breakers trip due to increased electrical demand from modern appliances, aging panels, or faulty wiring.
What Does It Mean When a Circuit Breaker Trips?
A circuit breaker trips when it automatically shuts off power to prevent overheating or electrical hazards. This safety feature helps protect your home from electrical fires and equipment damage.
If your breaker trips repeatedly, it is important to identify the underlying cause rather than simply resetting it.
Common Reasons Circuit Breakers Trip
1. Overloaded Circuit
An overloaded circuit occurs when too many devices are drawing power from the same circuit. This is one of the most common reasons breakers trip in residential homes.
2. Short Circuit
A short circuit happens when a hot wire touches a neutral wire, causing a sudden surge of electricity. This is a serious issue that requires immediate attention from a qualified electrician.
3. Ground Fault
Ground faults occur when electricity takes an unintended path to the ground. This is especially common in areas with moisture such as kitchens, bathrooms, and outdoor outlets.
4. Faulty Appliances
Sometimes the issue is not the wiring, but a malfunctioning appliance. A defective device can draw excessive current and cause the breaker to trip.
5. Outdated Electrical Panel
Older electrical panels may struggle to handle modern electrical loads, leading to frequent breaker trips. In these cases, an upgrade may be necessary.
Occasional tripping is normal, but frequent or repeated trips may indicate a larger issue within your electrical system. Warning signs include:
Breakers that trip multiple times per week
Burning smell near the electrical panel
Flickering or dimming lights
Breakers that will not reset properly
If you notice these symptoms, it may be time to evaluate your system or consider a panel upgrade.
Do You Need a Panel Upgrade?
If your electrical panel is outdated or undersized, it may not be able to handle your home’s current power demands. Many San Diego homes require upgrades to support modern appliances and electrical loads.
Discontinued Circuit Breakers: Finding Replacement Breakers for Older Electrical Systems
Many homes, commercial buildings, and industrial facilities continue to operate with electrical panels that require discontinued circuit breakers. When a breaker fails or additional circuits are needed, locating a compatible replacement can be challenging. Electrical Supplies Unlimited (ESU) specializes in helping customers find replacement breakers for obsolete and discontinued electrical systems throughout San Diego and Southern California.
Whether you're an electrician, contractor, facility manager, or property owner, understanding your options for discontinued breakers can help extend the life of your electrical system and avoid unnecessary panel replacement costs.
What Are Discontinued Circuit Breakers?
Discontinued circuit breakers are breakers that are no longer manufactured by the original company. Although production has ended, many of these breakers remain in service in residential, commercial, and industrial electrical panels throughout the United States.
As electrical equipment ages, replacement breakers often become difficult to locate through traditional electrical supply channels. This creates a growing demand for surplus, obsolete, and hard-to-find replacement breakers.
Common Discontinued Circuit Breaker Brands
Some of the most frequently requested discontinued breaker brands include:
Federal Pacific (FPE)
Zinsco
Challenger
Pushmatic
Bulldog
Bryant
Westinghouse
Sylvania
Crouse-Hinds
ITE Legacy Models
Many of these systems were installed decades ago and continue operating today, making replacement breakers an ongoing necessity.
Why Are Circuit Breakers Discontinued?
Manufacturers discontinue breaker lines for several reasons:
Product redesigns and technology upgrades
Company mergers and acquisitions
Changes in electrical code requirements
Reduced market demand
Introduction of newer breaker platforms
Even when production ends, many panels remain functional and continue requiring replacement components for maintenance and repairs.
Can You Still Buy Discontinued Circuit Breakers?
In many cases, yes. Discontinued breakers are often available through specialized suppliers that deal in surplus, obsolete, and hard-to-find electrical equipment.
Replacement options may include:
New surplus breakers
Professionally tested used breakers
Reconditioned breakers
Manufacturer-approved replacement solutions
Working with an experienced electrical supplier can help ensure compatibility and safe operation.
Federal Pacific, Zinsco, and Challenger Breakers
Among the most searched discontinued breaker brands are Federal Pacific (FPE), Zinsco, and Challenger. These panels remain common in older residential and commercial buildings throughout California.
Before purchasing a replacement breaker, it's important to identify:
Manufacturer
Breaker model number
Amperage rating
Voltage rating
Panel compatibility
If labels are missing or difficult to read, an experienced electrical supplier may be able to identify the breaker based on physical appearance and panel information.
Electrical Supplies Unlimited maintains inventory of many discontinued, obsolete, and hard-to-find circuit breakers for customers throughout San Diego County. Our team works with electricians, contractors, maintenance departments, and property managers to help locate replacement breakers quickly and efficiently.
Whether you need a discontinued residential breaker, a commercial panel component, or a hard-to-find industrial breaker, ESU can help identify and source the right solution.
Why Choose ESU?
For more than 40 years, Electrical Supplies Unlimited has been one of San Diego's trusted sources for circuit breakers, transformers, electrical panels, and obsolete electrical equipment.
Large inventory of discontinued breakers
New, used, and surplus inventory available
Experienced electrical supply specialists
Residential, commercial, and industrial expertise
Hard-to-find electrical equipment sourcing
Serving all of San Diego County
We specialize in helping customers find replacement breakers that many traditional suppliers can no longer obtain.
Circuit Breakers in San Diego! ESU buys and sells new & used Breakers and Panels!
Electrical Supplies Unlimited buys and sells new & used Circuit Breakers San Diego in San Diego surrounding areas including Hillcrest, Northpark, City Heights, Mission Valley, National City 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 San Diego and nearby areas such as Sorrento Valley, La Jolla, Miramar, Carmel Valley, University City, 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
Siemen Circuit Breakers in San Diego
Learn More About Circuit Breakers
Explore our in-depth guides to help you choose the right breaker and maintain a safe electrical system:
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!
Thermal Magnetic Circuit Breakers
Thermal Magnetic Circuit Breakers
Thermal magnetic circuit breakers are one of the most widely used types of circuit protection in residential, commercial, and industrial electrical systems. They combine two separate protection mechanisms—thermal protection for overloads and magnetic protection for short circuits—making them highly reliable and efficient.
These breakers are commonly found in modern electrical panels and are essential for protecting wiring, appliances, and electrical systems from damage caused by excessive current.
How Thermal Magnetic Circuit Breakers Work
Thermal magnetic circuit breakers use a dual protection system:
Thermal element: Responds to sustained overloads by heating a bimetal strip that trips the breaker.
Magnetic element: Responds instantly to short circuits using electromagnetic force to trip the breaker.
This combination allows the breaker to protect against both slow-building overloads and sudden electrical faults.
Where Thermal Magnetic Breakers Are Used
These breakers are standard in many electrical applications, including:
Residential electrical panels
Commercial buildings
Industrial equipment
HVAC systems
Motor control circuits
In San Diego, they are commonly used in both new construction and panel upgrades to meet modern electrical code requirements.
Benefits of Thermal Magnetic Circuit Breakers
Dual protection against overloads and short circuits
Reliable and long-lasting performance
Widely available and cost-effective
Compatible with most modern electrical panels
Thermal Magnetic vs Other Circuit Breakers
Unlike specialty breakers such as AFCI or GFCI breakers, thermal magnetic breakers focus on core electrical protection. They do not provide arc-fault or ground-fault protection but are essential as the primary layer of circuit safety.
Thermal magnetic circuit breakers are commonly used throughout San Diego homes and businesses due to their reliability and compliance with electrical code standards.
If your panel is outdated or overloaded, upgrading may be the safest solution. Many San Diego homeowners upgrade to support modern appliances, HVAC systems, and EV chargers.
Circuit Breaker Panel San Diego
When to Upgrade Your Electrical Panel
Knowing when to upgrade your electrical panel is essential for maintaining a safe and reliable electrical system. As homes add more appliances, HVAC systems, and modern technology, older panels often struggle to keep up with increased electrical demand.
If your panel is outdated or showing warning signs, upgrading your electrical panel can improve safety, prevent power issues, and support future electrical needs.
Signs You Need to Upgrade Your Electrical Panel
1. Frequent Circuit Breaker Trips
If your breakers trip regularly, it may be a sign that your panel is overloaded or unable to handle current electrical demand. Learn more about this issue in our guide on why circuit breakers keep tripping.
2. Your Panel Is Out of Space
If your panel has no room for additional circuits, you may be tempted to use tandem circuit breakers. While this can work in some cases, it is often a sign that a full panel upgrade is the better long-term solution.
3. You Have an Older or Outdated Panel
Older electrical panels may not meet current safety standards and may not provide reliable protection. Some outdated breaker systems are known to have safety concerns and should be evaluated for replacement.
4. Flickering or Dimming Lights
Lights that flicker or dim when appliances turn on may indicate that your panel cannot handle the electrical load. This is a common sign that your system needs an upgrade.
5. Adding New Appliances or Equipment
Installing new appliances such as HVAC systems, electric vehicle chargers, or kitchen equipment increases electrical demand. Many older panels are not designed to support these upgrades.
6. You’re Planning a Home Remodel or Addition
Home renovations often require additional circuits and increased electrical capacity. Upgrading your panel ensures your system can safely support new wiring and equipment.
Benefits of Upgrading Your Electrical Panel
Upgrading your panel provides several important advantages:
Improved electrical safety
Reduced risk of overloaded circuits
Increased capacity for modern appliances
Better system reliability
Support for future upgrades such as solar or EV charging
What Size Panel Do You Need?
Most modern homes upgrade to a 200-amp electrical panel to handle current and future electrical needs. The right panel size depends on your home’s electrical usage, number of circuits, and planned upgrades.
The cost of upgrading an electrical panel varies based on the size of the panel, labor requirements, and additional electrical work needed. Most residential upgrades fall within a predictable range.
When upgrading your panel, selecting the correct breakers is critical for safety and performance. Breakers must match your panel type and electrical requirements.
What Does It Mean When a Circuit Breaker Trips?
Circuit Breakers in San Diego! ESU buys and sells new & used Breakers and Panels!
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
