Transformers, Circuit Breakers and Electrical Supplies for Rancho Bernardo

circuit breaker tranformers miramar san diegoESU buys and sells new & used Transformers, Circuit Breakers, Fuses, Switches, Plugs and more for Electricians and Home Owners in Rancho Bernardo, San Diego

Electrical Supplies Unlimited buys and sells new Circuit Breakers, Transformers, Fuses, Switches, Plugs and more for Rancho Bernardo and San Diego surrounding areas including Carmel Valley, Miramar, Mira Mesa, 4S Ranch 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.

Welcome to Electrical Supplies Unlimited (ESU Inc), your trusted partner in the electrical supply industry for over four decades. With a rich history spanning 40 years, ESU has been the go-to source for electricians in Rancho Bernardo, San Diego. Our commitment to excellence is evident in our vast inventory of electrical supplies tailored for both the commercial and residential markets. From essential components like Power Transformers, Circuit Breakers, Fuses, Panelboards, to an extensive range of Switches and more, ESU is your one-stop solution for all your electrical needs.

As a premier Electrical Distributor and Electrical Wholesaler, ESU Inc stands out with a comprehensive selection of new and used electrical equipment. Our shelves are fully stocked with various lines to ensure that our customers have access to top-notch products. What sets us apart is our dedication to meeting the unique needs of our clients by specializing in hard-to-find items. At ESU, we take pride in not just providing supplies but delivering solutions, making us the preferred choice for electricians who demand quality, reliability, and a partner they can trust. Experience the ESU difference – where expertise meets exceptional service.


ESU Inc has been in the electrical supply business for over 30 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, 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

Transformers Electrical Supplies Unlimited buys and sells new power Transformers and more for Rancho Bernardo, San Diego County and surrounding areas including Oceanside, Encinitas, Carlsbad, Cardiff, Vista, San Marcos, Escondido 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.


ESU Inc has been in the electrical supply business for over 30 years. We have a large inventory of new, surplus and recycled electrical supplies both for the commercial and residential markets.  We can offer the best pricing on your used and obsolete Electrical Transformers as our large client base allows us to give you the highest price possible.

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 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 San Diego 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!