Thermal fuses are a new form of overheating prevention component. As a safety measure, most heat-generating devices are equipped with these. We are generally ignorant of them as they come pre-configured with our appliances. However, these fuses are rescuing us from potentially dangerous circumstances on their own. For instance, most household dryers, such as hairdryers and clothes dryers, have these fuses integrated within. If there is too much heat flow, causing the temperature on the dryer to escalate, these fuses will turn off the power to the primary heat source, keeping us safe.
Essentially, these are safety devices that detect overheating and take measures to control the damage.
Thermal fuses, also called thermal cutoffs, are mechanical devices that shut off circuits when they overheat to a certain point. They monitor heat generated by an excessive flow of current owing to a short circuit or system failure and prevent the situation from spiraling out of control.
Thermal fuses, unlike circuit breakers, don’t reset automatically when the temperature comes back under control. Whenever thermal fuses break or get activated, they have to be changed.
These are a kind of circuit breaker; however, they only respond to high temperatures, not high current overflow. These will not operate for excessive current flow except if the extra current forces the thermal fuse to overheat and activate.
Purpose of a Thermal Fuse
A thermal fuses are generally used as a threshold for heat-generating electronics.
As you can guess by the name, thermal fuses are commonly present in heat-generating electrical devices, including certain dryers like blow dryers, clothes dryers, and coffee machines.
They serve as safety measures, cutting off the power to the main heat source in the event of a failure, which could have enabled the heat to escalate to unsafe degrees, potentially causing a fire.
Way to Identify a Blown Thermal Fuse
For this, try connecting the left-hand side of the multimeter to the same side of the thermal fuse and do the same on the right-hand side. If the pointer doesn’t show signs of moving, you have blown a fuse.
And, if your device lacks a multimeter, there’s an easy way to check. For instance, if your device is turned on but not generating heat, it is most likely due to a blown fuse.
Basically, most of our heat-producing electronic appliances are equipped with these thermal fuses, which safeguard us from potentially harmful circumstances even when we are not aware of them.