What happens when a Dual Element Fuse is exposed to prolonged overload?

When a Dual Element Fuse is exposed to prolonged overload, the thermal cutout will melt. This device is designed to protect electrical circuits from damage caused by excess current.

In the case of a prolonged overload, the fuse’s thermal element reacts to the increased temperature caused by excess current flowing through it. The cutout contains a material that lowers its melting point. As the temperature rises, this material eventually melts, which interrupts the circuit and prevents further damage to connected components. This mechanism serves as an effective protective measure, ensuring that the fuse responds to sustained overload conditions before more severe consequences occur.

Understanding the function of the thermal cutout is crucial, as it highlights the protective role of the fuse in maintaining the integrity of electrical systems. The other potential options, such as automatic resetting or significant inactivity during overload, do not accurately describe the functionality of a Dual Element Fuse under conditions of prolonged overload.