We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.
Hardware

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

What are Thermal Fuses?

Mary McMahon
By
Updated: May 16, 2024

Thermal fuses are safety devices installed in electrical appliances which are designed to interrupt the circuit if the temperature rises to a dangerous level. Heat-producing devices such as stoves, microwaves, and hair dryers often have thermal fuses, and they can also be installed in a wide variety of other electrical circuits, such as light switches. These devices are usually intended as failsafes which will kick into place when other electrical safety measures such as circuit breakers fail to operate.

The design of a thermal fuse includes a component which responds to heat, such as a plastic pellet. When the component is activated, the circuit is pushed open, preventing power from reaching the appliance. Thermal fuses are single use safety devices, which means that they need to be replaced after they have activated, and they should never be replaced without determining the reason the fuse failed. This may necessitate the services of a repair person to examine the appliance and address the problem, and in some cases, it may be time to discard the appliance altogether.

When a thermal fuse fails, in addition to examining the appliance to look for problems which could have led to overheating, it may be advisable to examine the circuit the device is connected to as well. An electrical problem in the wiring of a house, for example, could trigger overheating of an appliance without necessarily tripping the circuit breakers, and the problem could develop into a more serious one if it is not addressed. If appliances plugged into the same circuit repeatedly fail, this suggests that there is a problem with the circuit, not the appliances.

Replacing thermal fuses is generally very easy, with most hardware stores stocking a range of thermal fuses for this purpose, and they can be clearly seen in the wiring for the appliance. For people who are not comfortable with electrical work, it is a good idea to ask an electrician to do the work, as he or she can also check the appliance while replacing the thermal fuse. As always when working with electrical components, people should make sure that power to the circuit they are working on is cut off while they work.

An alternative to a thermal fuse known as a thermal switch or thermal reset is designed for multiple uses. In this case, the device opens the circuit when the temperature is too high, and closes it when the temperature drops back down. Certain types of circuits can grow warm naturally, making a thermal switch more useful as a safety device.

EasyTechJunkie is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a EasyTechJunkie researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments
By Melonlity — On Feb 14, 2014

These simple little devices have prevented a number of fires, electrocutions and all sorts of the mayhem that can occur when things go wrong with electric appliances. The article is right in pointing out these are easy to replace and it is also right in mentioning that the underlying problem that caused the thermal fuse to activate in the first place should be examined. Once one of these is activated, it is almost always the sign of an underlying problem.

Safety first, kids.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
Share
https://www.easytechjunkie.com/what-are-thermal-fuses.htm
EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.