What happens to the eutectic alloy when enough heat is generated from excess current?

When excess current flows through a eutectic alloy, the heat generated can be significant enough to raise the temperature of the alloy. As the temperature exceeds the melting point of this particular alloy, it transitions from a solid state to a liquid state. This melting action is crucial because it triggers the activation of a tripping device—a safety mechanism designed to interrupt the circuit and prevent potential damage due to overheating or excessive current.

The ductile nature of eutectic alloys allows them to effectively serve in protection systems, as their ability to melt and create a break in the circuit is a practical and reliable response to overcurrent conditions. This behavior is instrumental in enhancing safety and preventing further electrical damage or hazards, as it works to disconnect the power in an uncontrolled situation.