Espey Mfg. & Electronics Corp. operates as a designer and original equipment manufacturer (OEM) in the power electronics sector, responsible for developing, producing, and rigorously testing electronic systems.

Its primary focus is on military and industrial applications, serving clients across the United States and globally.

The company's diverse product portfolio encompasses critical power components such as power supplies, converters, filters, transformers, and magnetic components. They also provide power distribution equipment, uninterruptible power supply (UPS) systems, antennas, and advanced high-power radar systems. These solutions are integral to a wide array of applications, including AC and DC locomotives, shipboard power and radar, airborne power systems, ground-based radar, and mobile ground power.

Additionally, Espey offers a comprehensive suite of services, including custom design and development to specific requirements, build-to-print manufacturing, detailed design studies, environmental testing, metal fabrication, painting, and the creation of automatic testing equipment.

The firm also manufactures individual components such as inductors, printed circuit boards (PCBs), wiring, and various test items.

Its clientele spans industrial manufacturers, defense contractors, the United States government, foreign governments, and international electronic equipment firms. Sales are managed through a direct sales force and a network of outside sales representatives. Incorporated in 1928, the company maintains its headquarters in Saratoga Springs, New York.