Circuit Protection

Training Center Classroom

From the rudimentary fuses of the past to the cutting-edge e-fuses and smart circuit breakers of today, these devices are continually refined to meet the demands of industries increasingly reliant on sensitive electronic equipment. The need for adequate and effective protection mechanisms has never been more critical.

In this classroom, we explore some basics, tools, and potential “zap!” scenarios designed to help you navigate the intricacies of circuit protection. Whether you’re a seasoned engineer or a newcomer to the field, our tutorials will empower you to design your electronics safely and confidently.

Aimee Kalnoskas

Editor in Chief, EE World Online

Circuit Protection Classroom sponsored by: 

Fuses • EVs

Fuses for power protection, Part 2

Advanced circuit protection for connected autonomous vehicles

Fuses, eFuses, thermistors, and fusible resistors – which and when?

Fuses for power protection, Part 1

Fuses are the oldest and easiest-to-understand circuit-protection components, with several common schematic representations.

Selecting the most suitable fuse for the application is more complicated than it may seem initially.

New protocols for high connectivity need robust protection for reliability and safety.

Tradeoffs when using different circuit protection technologies and a review of applications.

Surge protection • Overvoltage

Surge voltage protection considerations

Six considerations for better circuit protection

Power-supply overvoltage protection, Part 1: Crowbars

Power-supply overvoltage protection, Part 2: Clamps

Various SPD technologies enable designers to optimize surge protection networks for specific applications.

A look at the implementations of and applications for clamps for OVP and how and when to use them.

A discussion on the context of overvoltage protection and crowbars which provide OVP.

What to consider to protect your circuit or system from undesirable events and what to do about it.

Related Resources

Fuseology Design Guide

Circuit Protection Products Selection Guide

Choosing the correct fuse for your application can be overwhelming and time-consuming, even for a seasoned electronics design engineer. Our user-friendly guide makes the fuse selection process quick and easy—helping optimize the reliability and performance of your latest electronic application. The guide includes fuse characteristics, terms, design consideration factors, a fuse selection checklist, and relevant international standards and certifications.

Quickly find a protection solution appropriate for your application. This comprehensive guide summarizes key circuit protection considerations, descriptions of the technologies, and product selection tables relevant to various industries. It includes an application matrix that allows you to visualize where Littelfuse can solve design challenges for your projects.

Sensing Products Selection Guide

Power Semiconductor & IC Selection Guide

This guide provides an overview of magnetic and temperature sensing technologies, key consideration factors, descriptions of technologies Littelfuse offers, and product selection tables. It is designed to help you quickly find a sensing solution appropriate to your application.

The Power Semiconductor Selection Guide is available to help you find the right power semiconductor, gate driver, or solid-state relay for your applications. This selection guide offers a comprehensive portfolio of power semiconductor and integrated circuit technologies in industry standard and innovative packages.

ESD • Wireless charging

Fusible resistors vs fuses

No zapping! How to design safe and reliable wireless charging systems

Electrostatic discharge and analog circuits: Preventing the undetectable disaster

Safety standards often dictate what component provides the best protection against overcurrents.

Don't take internal IC protection for granted when handling ICs.

Smart use of protection components can help give consumers a trouble-free charge.

Many of the products you use every day contain Littelfuse products. They’re an integral part of smart phones, kitchen appliances, automotive electronics, HVAC, water/wastewater, energy, transportation, and beyond. Visit to learn more.

Littelfuse is a diversified industrial technology manufacturing company empowering a sustainable, connected, and safer world. We partner with customers across more than 20 countries and with approximately 18,000 global associates to design and deliver innovative, reliable solutions. Littelfuse serves over 100,000 end customers, with products found in various industrial, transportation, and electronics end markets—everywhere, every day. Littelfuse, founded in 1927, has its headquarters in Chicago, Illinois, United States. Learn more at

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