Littelfuse specializes in circuit protection, fuses, power control, and sensing solutions. They offer a wide range of products including automotive sensor products, battery management devices, DC power distribution modules, DC solenoids and relays, fusible switches and panels, fuses, gas discharge tubes, LED protectors, temperature sensors, TVS diode arrays, varistors, and more. Littelfuse provides solutions for various industries such as automotive, commercial vehicles, consumer electronics, data centers, and renewable energy, focusing on safety, efficiency, and innovation in their products.