Littelfuse, Inc. designs, manufactures, and sells electronic components, modules, and subassemblies. It operates through three segments: Electronics, Transportation, and Industrial. The Electronics segment offers fuses, fuse accessories, resettable fuses, switches, interconnect solutions, polymer electrostatic discharge suppressors, varistors, magnetic sensing, gas discharge tubes, transient voltage suppressor diodes, thyristors, MOSFETs, and IGBTs, serving data center, communications, industrial, aerospace, defense, appliance, consumer electronics, healthcare, energy storage, grid, and vehicle markets. The Transportation segment provides blade, resettable, high-current, and high-voltage fuses, battery cable protectors, circuit breakers, power distribution modules, and sensor products for heavy-duty truck, bus, construction, agriculture, off-road, recreational, material handling, passenger and commercial vehicle, and marine markets. The Industrial segment offers industrial fuses, protection relays, contactors, transformers, residual current devices, ground fault circuit interrupters, arc fault detection devices, solid state switches, and temperature sensors for renewable energy, energy storage, electric vehicle infrastructure, HVAC, industrial safety, non-residential construction, MRO, mining, and factory automation applications. Products are sold through distributors, a direct sales force, and manufacturers' representatives. Founded in 1927, the company is headquartered in Rosemont, Illinois.