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Sr. High Voltage Test Engineer

Littelfuse · Mount Prospect, IL · $88,500–$137,100 a year · Full time

Posted Jun 18, 2026 · We last checked this listing on Oct 6, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about a time a test failed in a dangerous way. What happened and what changed afterward?

What they are checking: Whether they learned from a real lab incident and improved procedures.

Tell me about a lab process or test fixture you improved.

What they are checking: Whether they make the lab better, not just run tests in it.

What would you do

Your results don't match what the design team expected. How do you decide whether it's the product or the test?

What they are checking: Whether they check their own setup and data before reporting a product problem.

Three teams all need lab time this week. How do you decide the order?

What they are checking: Whether they can prioritize fairly based on program impact and safety.

About the work

You'd test circuit protection devices in a high voltage lab. What safety practices do you insist on before energizing a test?

What they are checking: Whether they have strong high voltage safety habits, which protect everyone in the lab.

Walk me through how you'd design a short-circuit interruption test for a DC fuse in an EV application.

What they are checking: Whether they understand DC interruption, circuit time constants and test setup for automotive use.

What makes DC interruption harder than AC, and how does that affect your testing?

What they are checking: Whether they understand that DC has no natural current zero, which changes arc behavior.

How do you measure fast transients accurately at high voltage?

What they are checking: Whether they know probes, grounding and data acquisition well enough to trust the waveform.

Which standards for automotive or industrial circuit protection have you tested against?

What they are checking: Whether they know the test requirements their results will be judged by.

How do you write a test report that design engineers will actually use?

What they are checking: Whether they report findings clearly, with conditions and limits, so others can act on them.

Practice this interview out loud.

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The full job description

As published by Littelfuse.

Littelfuse (NASDAQ: 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. Guided by our principles We Care, We Succeed With Our Customers, and We Own the Outcome, we work collaboratively, think boldly, and deliver solutions that move industries forward. Are you passionate about electric circuits and power systems and want to be a part of the future of transportation? We are seeking a Senior High Voltage Electrical Test Engineer to join our state-of-the-art high voltage lab! As a Senior High Voltage Test Engineer , you will be responsible for testing and evaluating the performance of our cutting-edge circuit protection devices for a variety of applications. As a member of our team, you will have the opportunity to work on exciting projects and collaborate closely with a team of talented engineers to develop the latest advancements in circuit protection device technologies across both automotive and emerging industries. Responsibilities: • Develop test plans, procedures, and protocols for cutting-edge new and existing circuit protection devices for a variety of applications. • Execute high-voltage electrical and short circuit tests to evaluate performance, safety and durability of fuses and other circuit protection products. • Analyze and interpret test data and waveforms and create comprehensive test reports. • Participate in design reviews and provide technical feedback to product development teams. • Collaborate with cross-functional teams to develop and improve testing methods. • Perform preventative maintenance on the test equipment, maintain safety procedures, update risk assessments and operating procedures for the high voltage labs. • Lead the design/implementation of any improvements in the high voltage labs along with being the technical expert for ongoing initiatives. Qualifications: • Bachelor's or Master's degree in Electrical Engineering or related field (5+ years of experience) • Deep knowledge of electrical circuit design and data acquisition with • specialization in power electronics and/or programming. • Ability to test, diagnose and repair various electrical setups and circuits. • Hands-on experience in operation of oscilloscopes, multimeters, etc. • Hands-on experience in operation of oscilloscopes, multimeters, etc. • Ability to identify and implement efficient paths of action to complete assigned tasks. • Ability to operate well independently or as a team member in a fast-paced environment. • Advanced knowledge in MS office. • Strong analytical and problem-solving skills. • Excellent communication and presentation skills. • High attention to detail. Preferred Qualifications: • Experience with global manufacturing companies • Experience with Labview (or other automation software) • Knowledge of PLCs and related software #LIOB1 

Artificial intelligence (AI) tools may be used in some portions of the candidate review process for this position, however, all final employment decisions will be made by a person. Salary Range: $88,500 - $137,100 The salary offered will vary depending on your location, job-related skills, knowledge, and experience. At Littelfuse, we support employee growth and development. Guided by our culture principles, our teams work together to deliver value for customers and make a positive impact in the communities where we operate. We are an equal opportunity employer committed to fostering an inclusive workplace where everyone has the opportunity to grow and contribute. We offer competitive compensation and benefits, performance-based incentives, flexible work arrangements, and development opportunities.

Apply at Littelfuse