Littelfuse, Inc is an American electronic manufacturing company headquartered in Chicago, Illinois.^[2][3] The company primarily produces circuit protection products but also manufactures a variety of electronic switches and automotive sensors.^[3][4] Littelfuse was founded in 1927. In addition to its Chicago, Illinois, world headquarters, Littelfuse has more than 40 sales, distribution, manufacturing and engineering facilities in the Americas, Europe and Asia.

Littelfuse acquired Cole Hersee, a maker of power management products, heavy duty electromechanical and switches for commercial vehicles.