ESU, Inc. Electrical Supplies Unlimited

ESU, Inc. Electrical Supplies Unlimited buys and sells new, used, surplus and obsolete electrical equipment, with a focus on circuit breakers and transformers. Its stock also includes panelboards, disconnects and safety switches, fuses, meter sockets and motor starters, serving electricians, contractors, industrial facilities and homeowners. The company says it has more than 40 years in the business.

Electricians and homeowners can call for replacement breakers, hard-to-find transformers and panel parts. ESU also buys used transformers and surplus equipment, and it can ship same day when needed. Emergency calls go to a separate hotline, and an opening fee may apply. Regular phone hours are weekdays from 5 AM to 3:30 PM. The business is at Nancy Ridge Drive in San Diego.