ESU buys and sells new & used Transformers.

Hammond Electrical transformer, general use, open core, 30 kVA, 3-phase, 480 VAC Delta primary, 208Y/120 VAC secondary, 60 Hz, NEMA 3R, floor, wall 

Electrical Supplies Unlimited buys and sells new Circuit Breakers, Transformers, Fuses, Switches, Plugs and more for San Diego surrounding areas  We will buy 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 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.

Featured Transformer Specifications

Transformer Type General purpose
Core Type Open
Power Rating 30 kVA
Number of Phases 3
Primary Voltage 480 VAC Delta
Secondary Voltage 208Y/120 VAC
Frequency 60 Hz
Electrostatic Shield No
NEMA Rating 3R
Mounting Floor, wall or ceiling



This transformer is designed to convert 3-phase 480v to 3-phase 240v to run equipment such as panels, motors, datacenter equipment, and other business machines.