What happens to a Dual Element Fuse when exposed to an overload condition?

In a Dual Element Fuse, when an overload condition occurs, the thermal cutout is designed to respond to this event by melting. This action breaks the connection in the circuit, effectively opening it and preventing further damage or potential hazards that could arise from excessive current flow. The dual element design usually includes both a time-delay fuse link and a thermal element. The thermal component allows for a more gradual response to overloads, providing protection against short bursts of high current that may not be sustained. However, if the condition persists and exceeds the fuse's rated capacity, the thermal cutout will melt and break the circuit.

Other options focus on different reactions that do not accurately describe the functioning of a Dual Element Fuse. For example, immediate melting of the fuse link without the thermal element's influence does not represent the deliberate design of this fuse type aimed at graded response. A scenario where no action occurs contradicts the primary function of a fuse, which is to protect the circuit by interrupting the current flow under overload conditions. Lastly, the suggestion that a spring becomes permanently damaged does not relate to the operational capabilities of a Dual Element Fuse, as these fuses rely on melting elements rather than mechanical components to interrupt the circuit.