Littelfuse Fuse Blocks
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About Littelfuse: A Century of Circuit Protection Innovation
Littelfuse has been engineering circuit protection solutions since 1927, when founder Edward V. Sundt developed the company's first small protective fuse in Chicago, Illinois. Nearly a century later, Littelfuse has grown into a global leader whose products are trusted across automotive and commercial vehicles, industrial machinery, telecommunications, medical devices, and consumer electronics.
One of the brand's most consequential milestones came in 1976, when Littelfuse invented the AutoFuse — the world's first blade-type automotive fuse. That compact, reliable design became the industry standard and remains the foundation of modern vehicle electrical systems to this day. It's a testament to the engineering-first culture that has driven the company for nearly 100 years.
Automotive Expertise Across Every Circuit
In the automotive world, Littelfuse is perhaps best known for its extensive lineup of fuses. The portfolio spans blade fuses, cartridge fuses, high-current bolt-down fuses, and high-voltage fuses for EV and hybrid applications, covering both OEM fitment and aftermarket replacement needs. Whether you're replacing a blown fuse or upgrading the electrical system on a truck or SUV, Littelfuse offers solutions engineered to match or exceed original equipment performance.
Beyond individual fuses, the brand makes it easy to keep a full supply on hand with convenient fuse kits that cover the most common amperage ratings — a practical choice for any glove box or garage toolbox. And for those building out custom electrical systems or consolidating power distribution, Littelfuse fuse blocks provide a clean, organized solution that accepts a wide range of fuse types and relay configurations.
Rounding out the brand's electrical control offerings is its robust selection of fuses for both light-duty and heavy-duty applications, as well as a full line of starter motor control relays. Littelfuse solenoid relays act as on-off switches for starters, motors, lights, and accessory systems in commercial vehicles, with both intermittent-duty and continuous-duty models available to match the demands of the application.
Why Technicians and Enthusiasts Trust Littelfuse
- Pioneer of the blade fuse: Littelfuse invented the AutoFuse format that every modern vehicle relies on.
- OEM and aftermarket coverage: Products are designed to fit and function as direct replacements in a vast range of makes and models.
- Broad product depth: From micro blade fuses to high-voltage EV fuses and heavy-duty starter relays, the catalog covers virtually every automotive electrical need.
- Proven reliability: Used by OEM manufacturers and relied upon by professional technicians worldwide.
- Innovation across industries: Engineering expertise developed across automotive, industrial, and electronics markets translates into components built to demanding standards.
Whether you're a DIY enthusiast troubleshooting an electrical fault or a fleet manager sourcing commercial vehicle components, Littelfuse delivers the depth, quality, and reliability your electrical systems demand.