What is the purpose of using a fusible link in the APC system?

The purpose of using a fusible link in the APC (Automatic Protection Control) system is to automatically activate when conditions are met. A fusible link is a safety device that typically consists of a metal piece designed to melt at a certain temperature. When the temperature rises sufficiently, indicating a potential fire or overheating condition, the link melts and triggers an automatic response from the system, such as activating fire suppression or ventilation systems. This automatic activation is crucial for ensuring timely intervention in emergencies without the need for human intervention, thereby enhancing safety and protection. Moreover, the fusible link serves as a reliable method to initiate an action based on the specific environmental conditions rather than manual processes.