At what temperature does a fusible link melt?

The correct choice indicates that a fusible link typically melts at a temperature of 300 degrees Fahrenheit. Fusible links are designed as heat-responsive devices, commonly used in fire safety systems. They function by melting at specific temperatures to activate a system, such as closing a fire shutter or triggering an alarm.

The choice of 300 degrees Fahrenheit as the melting point reflects a standard used in many applications, where this temperature is a critical threshold for activating safety measures in environments where overheating could lead to hazardous situations. This precision allows for timely responses to fire or heat emergencies, ensuring that safety protocols can be enacted effectively.

Fusible links are engineered to respond in a predictable manner, and their melting points are chosen based on the need to balance sensitivity to heat with reliability in preventing false activations. The other temperature options do not align with the common melting point for fusible links, which is more aligned with the choice of 300 degrees Fahrenheit.