LFUS) is a diversified industrial technology manufacturing company shaping solutions for the safe and efficient transfer of electrical energy. Headquartered in Chicago, Illinois, USA, we serve customers across industrial, transportation, and electronics markets worldwide. With approximately 16,000 employees we design and manufacture innovative technologies that support electrification, energy efficiency, and advanced automation.

Our global reach is matched by a culture that empowers innovation and long‑term growth. Littelfuse is seeking an experienced Senior Electrical Engineer to join our Solid‑State Protection Systems team in SanSebastien, Spain. In this role, you will contribute to the development of next‑generation protection and control products for AC and DC electrical systems.

You will work across multiple disciplines to design, validate, and launch innovative solutions that combine power electronics, embedded control, and system‑level protection technologies. Design and develop electrical circuits and subsystems for solid‑state protection and control products. Perform schematic capture, simulation, component selection, stress analysis, and PCB design reviews.

Support laboratory evaluation, troubleshooting, and validation testing of AC and DC protection systems. Participate in product qualification, reliability testing, and compliance activities. Work closely with manufacturing and supplier partners to ensure product performance, quality, and cost objectives are achieved.

Contribute to technical discussions, design reviews, and project planning activities. Support occasional travel to manufacturing sites, suppliers, or customer locations.



BS or MS degree in Electrical Engineering. ~10+ years of experience in electrical product development. ~ Strong background in analog, digital, and mixed‑signal circuit design. ~ Understanding of power electronics, protection systems, and current sensing technologies. ~ Ability to work independently and drive technical decisions within project teams. ~ Nice to have Experience with industrial, energy, automotive, or power distribution applications. ~ Knowledge of smart protection, control, or monitoring solutions. #We offer competitive compensation and benefits, performance‑based incentives, adaptable work arrangements, and development opportunities.

Our humble roots date back to 1927, where, in the back of a garage on Chicago’s northside, our founder, Edward Sundt, developed a small, fast‑acting, protective fuse for use in sensitive test meters. With the ever‑evolving electrification and electronification of customer applications, our product technologies are closely linked to sustainable applications such as electric vehicles and EV charging infrastructure, renewable energy and energy storage, factory automation, power management and more. From the production line to the engineering lab, the office or distribution center, Littelfuse people are an important part of a diverse, talented team of the best and brightest in the industry.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, gender identity, sexual orientation, disability, protected veteran status, and/or any other protected class under federal, state, or local law. #

📌 Senior Engineer - Electrical Engineering (San Sebastián)
🏢 Littelfuse
📍 San Sebastián