What is the role of a fusible link in a sprinkler system?

A fusible link in a sprinkler system plays a crucial role as a temperature-sensitive component. When the temperature in the area around the fusible link rises to a predetermined level, the heat causes the link to melt. This melting action serves as a trigger, allowing the sprinkler system to activate and start discharging water to suppress or extinguish a fire.

The choice of this answer highlights the essential function of the fusible link as a heat responsive device, which is critical for the immediate response of the sprinkler system to a fire situation. This automatic response mechanism helps to contain or eliminate fires before they can spread, thereby enhancing safety in buildings equipped with such systems.