Circuit Breakers New, Used, Surplus, Buy & Sell for San Diego, Riverside, Orange County, Los Angeles and more
Electrical Supplies Unlimited (ESU) is a trusted electrical distributor that buys and sells new and used circuit breakers for customers throughout San Diego, Riverside, Orange County, Los Angeles, and surrounding Southern California markets. With over 40 years in the electrical supply industry, ESU maintains one of the region’s largest inventories of circuit breakers across a wide range of amperages and voltages, serving both commercial and residential applications. Contractors, electricians, and maintenance teams rely on ESU because they consistently buy and sell new and used circuit breakers from leading manufacturers, including Zinsco, Federal Pacific (FPE), Pushmatic, Bulldog, Cutler Hammer, ITE Siemens, and Square D. From hard-to-find legacy breakers to high-capacity three-phase units, ESU delivers dependable breaker supplies in San Diego with competitive pricing, expert guidance, and fast availability—whether you’re purchasing, replacing, or selling surplus circuit breakers.
Circuit Breakers Electrical Supplies Unlimited is your go-to source for Circuit Breaker electrical supplies in San Diego and surrounding areas. We have been in business for over 40 years and have a large inventory of most voltages of circuit breakers and 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
Medium Voltage Breakers
Low Voltage Circuit Breakers
High Voltage Circuit Breakers
Electrical Supplies Unlimited (ESU) provides a comprehensive selection of high-quality circuit breakers for residential, commercial, and industrial applications. Residential breakers are commonly used in home electrical panels to protect circuits from overloads and short circuits. These breakers automatically cut off power when a fault is detected, preventing fires and equipment damage. Commercial breakers operate on the same principle but are built to handle higher voltages and more demanding electrical loads typically found in offices, retail buildings, and industrial facilities. ESU also offers popout resettable breakers, which feature a convenient button that "pops out" when tripped, allowing for easy manual reset without replacement—ideal for repeated-use circuits and safety-critical systems.
In addition to traditional circuit protection, ESU stocks specialized components such as DIN rail mounted breakers, which are widely used in industrial and automation control panels. These compact units snap into standardized DIN rails, making installation simple and scalable for complex systems. Popout resettable breakers are also available in DIN-mounted form for streamlined panel integration. To further enhance safety and functionality, ESU provides a variety of breaker accessories, including lockout devices, mounting hardware, and labels, enabling users to customize and secure their breaker setups according to specific code requirements or operational needs. Whether you're outfitting a residential panel or an industrial control cabinet, ESU has the right circuit protection solution.
Molded Case Circuit Breakers MCCB
Electrical Supplies Unlimited is your go-to source for high-quality Molded Case Circuit Breakers (MCCBs), offering top-tier electrical protection solutions at competitive prices. MCCBs are essential safety devices designed to automatically interrupt circuits in the event of overcurrent situations, such as short circuits or overloads, preventing damage to electrical systems and reducing fire risks. These breakers are housed in a durable, insulated molded case, ensuring long-lasting reliability and protection. At Electrical Supplies Unlimited, we carry a wide selection of MCCBs to suit various applications, providing superior electrical safety for residential, commercial, and industrial needs. Shop with us today for trusted electrical solutions that keep your systems running safely and efficiently.
Miniature Circuit Breakers (MCB)
Miniature circuit breakers (MCBs) are commonly used in residential and light commercial electrical systems. These breakers provide protection against overloads and short circuits and are typically rated for lower current applications.
Compared to molded case circuit breakers, MCBs are smaller in size and are designed for circuits with lower electrical demand, making them ideal for homes and smaller electrical panels.
Air Circuit Breakers (ACB)
Air circuit breakers (ACBs) are designed for high-capacity electrical systems and are commonly used in large commercial and industrial applications. These breakers use air as the arc extinguishing medium and are capable of handling very high current loads.
ACBs are typically installed in main distribution panels and switchgear systems, where reliable protection and advanced control features are required.
********************************************************************
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 are circuit breakers and electrical hardware experts and have decaades of experience to help you. Do not hesitate to call us at 858.558.2850 to find out which Circuit Breaker is right for your requirement.
Electrical Supplies Unlimited is your company's business source for testing, repairing, rebuilding or reconditioning electrical equipment. ESU maintains a wide variety of out of stock circuit breakers, relays, transformers, switches, relays, motor controls, and other electrical equipment. ESU will also purchase your excess electrical inventory. We also buy new and used transformers. Call us today to find out more. Some merchandise may be available as used or surplus, just call one of our representatives to find out more!
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.
If you're looking for circuit breakers in San Diego, Electrical Supplies Unlimited offers one of the most comprehensive selections in the region. Whether you're replacing a single breaker or outfitting an entire panel, we provide fast access to both hard-to-find and standard breakers from top brands like Zinsco, Federal Pacific FPE, Siemens, Pushmatic, and Square D. Our San Diego location stocks circuit breakers ranging from low voltage residential units to medium voltage commercial-grade systems, ensuring you get exactly what you need for your project. With over four decades of experience serving San Diego electricians, contractors, and homeowners, we’re your trusted local source for San Diego circuit breakers and electrical solutions.
Learn More About Circuit Breakers
Explore our in-depth guides to help you choose the right breaker and maintain a safe electrical system:
