What is the brain or main controller of the fire alarm system?

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The brain of a fire alarm system is the fire alarm control unit, the component that acts as the fire alarm control panel. It constantly monitors inputs from detectors and manual pull stations, evaluates whether a fire condition exists, and then activates the appropriate outputs. It directs the notification appliances (sirens, horns, strobes) and coordinates other actions like releasing devices or paging, while also managing power status and fault reporting. Without this control unit, sensors could detect something but there would be no centralized decision or coordinated activation of alarms.

The other parts have specific roles but do not decide when to alarm. Notification appliances are the audible and visual alerts that warn occupants. The power source provides the energy needed for the system to operate. Auxiliary devices support the system or provide additional functions but rely on the control unit to orchestrate the overall response.