What type of switches are used in a thermal switch fire detection system?

In a thermal switch fire detection system, temperature-sensitive switches are employed because they are designed to respond to specific temperature thresholds. These switches contain a temperature-sensitive element that changes state when the temperature reaches a predetermined level, indicating a potential fire condition.

When the temperature rises beyond the normal operating range, often due to combustion or overheating, the thermal switch completes an electrical circuit, signaling an alarm or activating a fire suppression system. This mechanism is crucial in ensuring timely detection of fire hazards in aircraft environments where rapid response is essential for safety.

The other types of switches, while useful in different applications, do not serve the same specific function in fire detection. For instance, pressure-sensitive switches react to changes in pressure, magnetic switches operate based on magnetic fields, and optical switches work by detecting light changes. None of these would provide the necessary thermal response required for effective fire detection, which is why temperature-sensitive switches are the correct choice for this system.