ESU buys and sells new & used Circuit Breakers, Fuses, Switches, Plugs and more for Sherman Heights in San Diego.

Electrical Supplies Unlimited buys and sells new & used Circuit Breakers in Sherman Heights and surrounding areas including East Village, Little Italy, Bankers Hill, Sorrento Valley 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 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 Sherman Heights in San Diego and surrounding areas including Gaslamp Quarter, East Village, Little Italy, Bankers Hill, Golden Hill, 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 Sherman Heights 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!

Residential Circuit Breaker Safety Tips for Homeowners

Residential circuit breakers are designed to protect your home’s electrical system from dangerous overloads and short circuits. When working properly, a breaker automatically shuts off power when electrical current exceeds safe levels, preventing fires, damaged appliances, and serious electrical hazards.

Understanding residential circuit breaker safety is essential for homeowners, property managers, and electricians. Knowing how to recognize warning signs and follow basic home electrical safety tips can help prevent costly repairs and protect your family.

Why Circuit Breaker Safety Matters in Homes

Your electrical panel distributes electricity throughout your home. Each circuit breaker protects a specific circuit by stopping electrical flow when a problem occurs. Without properly functioning breakers, overloaded circuits could overheat wiring and potentially start electrical fires.

Following proper electrical panel safety practices helps ensure your system remains reliable and compliant with modern electrical standards.

Never Overload Electrical Circuits

One of the most common causes of breaker trips is circuit overload. This occurs when too many appliances draw power from the same circuit at the same time.

High-power devices such as space heaters, microwaves, hair dryers, and portable air conditioners can quickly exceed a circuit's capacity. Spreading appliances across different outlets and circuits helps prevent overload conditions.

Do Not Ignore Frequently Tripping Breakers

A breaker that trips occasionally may simply indicate temporary overload. However, breakers that trip repeatedly may signal a more serious electrical issue such as damaged wiring, faulty appliances, or a failing breaker.

If you experience frequent breaker trips, it's important to investigate the cause rather than repeatedly resetting the breaker.

Keep Your Electrical Panel Accessible

Your breaker panel should always remain easily accessible in case power needs to be shut off quickly during an emergency. Avoid blocking the panel with furniture, storage boxes, or other household items.

Electrical panels should also be clearly labeled so each breaker can be quickly identified when troubleshooting a problem.

Watch for Warning Signs of Electrical Problems

Several warning signs may indicate a circuit breaker or electrical panel issue:

• Burning smells near the electrical panel
• Warm or hot breaker switches
• Flickering lights throughout the home
• Breakers that will not stay reset
• Buzzing or crackling sounds from the panel

If any of these symptoms occur, the breaker or wiring may require professional inspection.

Replace Outdated or Unsafe Breakers

Some older electrical panels contain breakers that are now considered unsafe or unreliable. Brands such as FPE Stab-Lok, Zinsco, and certain Challenger panels have been associated with failure to trip during electrical faults.

Replacing outdated breakers with modern, code-compliant components greatly improves residential electrical safety.

When to Call an Electrician

While homeowners can safely reset a breaker, electrical repairs and panel upgrades should always be performed by qualified professionals. Licensed electricians can diagnose wiring problems, replace faulty breakers, and ensure the system meets current electrical code requirements.

Learn More About Circuit Breakers

If you want to better understand breaker types, compatibility, and electrical system protection, explore our complete Circuit Breaker Resource Hub where we provide expert guidance for residential, commercial, and industrial applications.

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

Circuit Breakers Linda Vista San Diego – New & Used Breakers, Panels & Electrical Supplies

Electrical Supplies Unlimited (ESU) is your dependable source for Circuit Breakers in Linda Vista San Diego, serving electricians, contractors, businesses, and homeowners throughout Linda Vista, Mission Valley, Kearny Mesa, Clairemont, Serra Mesa, and surrounding San Diego communities.

We specialize in buying and selling new, used, surplus, and obsolete circuit breakers, electrical panels, transformers, and hard-to-find electrical components. Whether you need replacement breakers for residential repairs or industrial-grade electrical equipment, ESU offers over 40 years of trusted electrical supply experience.

Trusted San Diego Circuit Breaker Supplier for Over 40 Years

ESU has proudly served the San Diego electrical supply industry since 1985. As a fully stocked electrical distributor and wholesaler, we maintain an extensive inventory of circuit breakers and electrical supplies for residential, commercial, and industrial applications.

Our knowledgeable team specializes in locating difficult-to-find and discontinued products, helping customers throughout Linda Vista and San Diego source dependable electrical solutions quickly.

Major Circuit Breaker Brands Available

We stock products from most leading electrical manufacturers, 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.

Complete Electrical Supply Inventory

In addition to circuit breakers, our inventory includes:

• Transformers
• Panelboards up to 600V
• Disconnects & Safety Switches
• Fuses up to 3000 Amps
• Meter Sockets
• Motor Starters & Relays
• Lighting Ballasts & Fixtures
• Bolt Switch Pullouts
• Commercial and industrial electrical hardware

We also provide Greenlee wire pullers, conduit benders, and electrical contractor tools for local projects throughout San Diego County.

New, Used & Obsolete Circuit Breakers in San Diego

ESU is one of San Diego’s premier suppliers for circuit breakers across most amperages and voltages. We stock:

• 20 Amp to 125 Amp Zinsco breakers
• 15 Amp to 100 Amp Pushmatic breakers
• 20 Amp to 1200 Amp Siemens breakers
• 15 Amp to 1200 Amp Federal Pacific (FPE) breakers
• Single-phase and 3-phase commercial breakers

We also offer specialty solutions including tandem circuit breakers, panel upgrades, and breaker replacement solutions for outdated or discontinued systems.

Serving Linda Vista San Diego & Nearby Communities

We proudly serve customers throughout:

• Linda Vista San Diego
• Mission Valley
• Kearny Mesa
• Clairemont
• Serra Mesa
• Mira Mesa
• San Diego
• Vista
• Oceanside
• All San Diego County

We also ship electrical products nationwide for customers outside Southern California.

Circuit Breaker Resources & Electrical Expertise

Whether you need help selecting the correct breaker, replacing outdated panels, or sourcing commercial electrical equipment, ESU offers trusted expertise and one of the largest inventories in the region.

Helpful resources include:

• How to Choose the Right Circuit Breaker
• When to Upgrade Your Electrical Panel
• Circuit Breaker Panel Upgrade Cost
• Circuit Breaker Resource Hub

Your Linda Vista San Diego Circuit Breaker Experts

Electrical Supplies Unlimited combines deep product knowledge, decades of industry experience, and one of Southern California’s most diverse inventories of circuit breakers and electrical supplies.

Whether you are an electrician, contractor, property manager, or homeowner, ESU is your trusted source for circuit breakers in Linda Vista 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 solution for your project.

Circuit Breaker Amperage Guide: Understanding Breaker Sizes and Ratings

Choosing the correct circuit breaker amperage is essential for protecting electrical wiring, equipment, and appliances from overloads and short circuits. Whether you're replacing an existing breaker, upgrading an electrical panel, or planning a new installation, understanding breaker amp ratings helps ensure safety, performance, and code compliance.

This guide explains the most common circuit breaker sizes, how amperage ratings work, and how to select the right breaker for your electrical application.

What Does Circuit Breaker Amperage Mean?

A circuit breaker's amperage rating indicates the maximum amount of electrical current the breaker can safely carry before tripping. When electrical current exceeds the breaker's rated capacity, the breaker automatically disconnects power to help prevent overheating, equipment damage, and electrical fires.

Common residential and commercial breaker sizes range from 15 amps to several hundred amps depending on the application.

15 Amp Circuit Breakers

15 amp breakers are commonly used for standard lighting circuits, bedrooms, living rooms, and general-purpose receptacles in residential applications.

These breakers typically protect 14-gauge copper wiring and are among the most frequently installed breakers in homes.

20 Amp Circuit Breakers

20 amp breakers are commonly used for kitchens, bathrooms, garages, laundry rooms, and other circuits where higher electrical loads are expected.

These breakers typically require 12-gauge copper wiring and provide additional capacity compared to 15 amp circuits.

30 Amp Circuit Breakers

30 amp breakers are often used for larger appliances and dedicated circuits, including:

• Electric dryers
• Water heaters
• Small HVAC equipment
• Specialized electrical equipment

These circuits commonly operate at 240 volts and require appropriately sized conductors.

40 Amp Circuit Breakers

40 amp breakers are frequently used for electric ranges, cooktops, HVAC systems, and larger residential electrical loads.

They are commonly found in both residential and light commercial installations.

50 Amp Circuit Breakers

50 amp breakers are often installed for:

• Electric vehicle chargers
• Large HVAC systems
• Hot tubs and spas
• Welders
• Subpanels

As electric vehicle adoption continues to grow, 50 amp breakers have become increasingly common in residential applications.

60 Amp Circuit Breakers

60 amp breakers are frequently used for subpanels, larger HVAC systems, commercial equipment, and specialized electrical installations requiring additional capacity.

They provide a reliable solution when greater electrical demand exceeds standard residential circuit requirements.

100 Amp Circuit Breakers

100 amp breakers are commonly used as service disconnects, feeder breakers, and subpanel protection devices.

Many older homes still operate on 100 amp electrical service, although modern homes often require larger capacities.

200 Amp Electrical Service

Today, 200 amp service is considered the standard for most new residential construction. A 200 amp electrical panel provides sufficient capacity for modern appliances, HVAC systems, home offices, electric vehicle chargers, and future electrical expansion.

Many homeowners upgrade older 100 amp panels to 200 amp service to accommodate increasing electrical demands.

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

How to Determine What Size Breaker You Need

Several factors influence the proper breaker size for a circuit:

• Electrical load requirements
• Wire size and conductor type
• Voltage requirements
• Continuous versus intermittent loads
• Equipment manufacturer specifications
• Local electrical code requirements

Installing an oversized breaker can create safety hazards, while undersized breakers may trip unnecessarily.

For additional guidance, visit our How to Choose the Right Circuit Breaker resource.

Common Circuit Breaker Types Available

In addition to different amperage ratings, breakers are available in several configurations:

• Single-pole breakers
• Double-pole breakers
• Tandem circuit breakers
• GFCI circuit breakers
• AFCI circuit breakers
• Commercial and industrial breakers

Each breaker type serves a specific purpose depending on the electrical application.

Learn more about Tandem Circuit Breakers and GFCI Circuit Breakers.

Replacing Circuit Breakers

If a breaker is damaged, repeatedly tripping, or no longer functioning properly, replacement may be necessary. It is important to select a replacement breaker with the correct amperage rating and panel compatibility.

Read our complete Circuit Breaker Replacement Guide for additional information.

Finding Circuit Breakers in San Diego

Electrical Supplies Unlimited carries a large inventory of new, used, surplus, and obsolete circuit breakers in a wide range of amperages and configurations. We stock products from many leading manufacturers including Siemens, Square D, Eaton, Cutler Hammer, General Electric, Federal Pacific (FPE), Challenger, Pushmatic, and more.

Whether you need a 15 amp residential breaker or a large commercial power distribution breaker, our experienced team can help you locate the correct solution.

More Circuit Breaker Resources

• Circuit Breaker Resource Hub
• Circuit Breakers San Diego
• How to Choose the Right Circuit Breaker
• Electrical Panels and Circuit Breakers
• Circuit Breaker Replacement Guide
• When to Upgrade Your Electrical Panel
• Buy Circuit Breakers San Diego