Founded in 1974 by Kirti P. Shah, Custom Magnetics manufactures custom-designed transformers and coils for the electrical/electronics industries. Custom Magnetics produces products for a wide range of applications including audio amplifiers, intercoms, voice and music reproduction equipment, power supplies, test and measurement instruments, telephone communication networks, transducers for power measurements, medical analyzers, industrial controls, etc. Many types of transformers are produced including laminated, toroidal, ferrite cores of all shapes and sizes, and R-Core.

Custom Magnetics enjoys approximately 40,000 square feet of air-conditioned production and office space at its main facility in North Manchester, Indiana. Manufacturing equipment used in the various processes includes multiple layer winders, high speed bobbin and toroidal winders, R-Core winders, automatic lamination stacking machines, vacuum impregnation tanks, baking ovens, and computerized test equipment. The North Manchester facility is capable of producing transformers up to 1,000 VA and frequencies up to 250,000 Hertz.

An ISO9002 certified company, Custom Magnetics has built its reputation on engineering expertise and a commitment to quality. A well-trained workforce of approximately 65 is capable of fast delivery of small to medium volume orders from the North Manchester facility.

During the 1990's, Custom Magnetics began developing higher volume production capabilities with its joint venture partner in Baroda, India. Over the years, CMI-India has proven to be a reliable partner with the ability to produce large volume orders at low cost.

In 2002, Custom Magnetics further strengthened its production capabilities with the acquisition of James Electronics located in Chicago, Illinois. The James Electronics Division, operating for over 50 years, is a leading manufacturer of telecommunications transformers and power supplies.