A thermal switch detector system uses thermal switches to perform what function?

• A. Activate the warning system by heating and closing a circuit
• B. Detect ambient temperature
• C. Detect smoke
• D. Trigger an audible alarm only

Answer: (A)

Thermal switches act as temperature-activated contacts. When a monitored spot reaches its set temperature, the switch changes state and closes the circuit, energizing the warning system. That means the device’s purpose is to trigger the alert by heating-induced closure, not to continuously measure ambient temperature, detect smoke, or produce sound alone. The closing action is the mechanism that activates the warning, making this the best description of what a thermal switch detector system does.