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Founded in 1927, Littelfuse, Inc. is a U.S.-based industrial technology company headquartered in Chicago, Illinois. It was started by Edward V. Sundt, who invented the first compact fast-acting fuse to protect electrical testing devices. Over nearly a century, Littelfuse has become a leader in circuit protection, power control, and sensing technologies. With approximately 16,000 employees across more than 20 countries and serving over 100,000 end customers, it produces fuses, semiconductors, relays, sensors, and custom protection solutions across industry, automotive, and electronics markets.The company achieves annual revenues over $2.2 billion and invests heavily in R&D, holding over 1,300 patents as of 2024.