Commercial Metering Switchboards

Panelboards are typically flush mounted or surface mounted and are limited to a maximum of 1,200 A incoming current (main). Switchboards are free-standing units that are front connected and, like panelboards, require only front access. However, switchboards can allow for both front and rear access if desired.

ESU is your go-to destination for all your electrical switchboard needs. As a leading electrical supplies company for over 40 years in San Diego, ESU stands out by offering a comprehensive range of services that include buying, selling, and stocking new, surplus, and recycled electrical switchboards. We cater to both the commercial and residential markets, ensuring that our clients have access to top-quality electrical components for their diverse projects. Our commitment to sustainability is reflected in our recycled offerings, providing eco-friendly solutions without compromising on performance. Whether you're upgrading a commercial facility or working on a residential project, ESU is your reliable partner for cost-effective, high-quality electrical switchboards. Explore our extensive inventory and experience the ESU difference in meeting your electrical supply needs.

 For over four decades, Electrical Supplies Unlimited (ESU) has been the trusted name for electricians and homeowners across San Diego, Orange, and Riverside Counties. Specializing in new, surplus, and recycled Commercial Metering Switchboards, ESU ensures that customers have access to top-quality electrical supplies that meet their needs and budget. With a commitment to sustainability and reliability, ESU sources and stocks a diverse range of switchboards to cater to various residential and commercial projects. Whether you're a seasoned electrician or a homeowner embarking on a DIY project, ESU is your go-to destination for all your electrical supply needs. Discover why customers have relied on ESU for over 40 years and experience the difference in quality and service today.

 Commercial metering switchboards provide electrical system distribution and metering for shopping centers, office buildings and other commercial multimetering applications. Using standard construction and features, these switchboards incorporate metering sections with tenant feeder circuits using meter sockets to meet local utility or customer requirements. All meter sockets and associated feeder devices are completely factory prewired and shipped ready for the installation of the meter
Eaton’s Pow-R-Line distribution switchboards combine a space-saving design with modular construction and increased system ratings to provide economical and dependable electrical system distribution and protection.

Overcurrent Devices To properly select and size overcurrent devices for use in a switchboard, the allowable temperature rise must be taken into account as to its effect on the tripping characteristics of the devices in question. Accordingly, Article 220 of the NEC® requires overcurrent devices to be rated not less than 125% of the continuous load they are protecting. To comply with this, an 80% derating factor must be used with all overcurrent devices such as molded case breakers and FDPW fusible switches unless they are tested and marked as 100% rated devices. Short-Circuit Rating Standard bus and connectors on all switchboards are rated for use on systems capable of producing up to 65,000A rms symmetrical short-circuit current at the incoming terminals. Increased bus short-circuit ratings equal to that of connected switchboard devices, up to 200,000A rms symmetrical, are available in most Pow-R-Line switchboards when approved main devices are installed. Contact Eaton for more information. UL labeled switchboard sections are marked with their applicable short-circuit rating.


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 both new and used 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 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 voltages and amperages. 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!