What device must be manually reset after activation to restore normal function in a fire alarm system?

In a fire alarm system, a manual pull station is designed to be activated by individuals in case of an emergency, allowing them to initiate the fire alarm process. Once a manual pull station is activated, it sends a signal to the fire alarm control panel, which in turn alerts occupants and activates alarm signals. However, after activation, the manual pull station must be manually reset to restore its function and ensure that it is operational for any future emergencies. This process often involves either physically resetting the device or using a key or tool to reset it.

The other devices listed do not require a manual reset after activation. For instance, smoke detectors and heat detectors automatically reset themselves once the conditions that triggered them (smoke or heat) are removed, and they generally do not need to be manually reset. The fire alarm control panel may require resetting after certain conditions are cleared or after alarms have been managed, but it functions differently compared to the manual pull station in terms of manual intervention for restoring its state. Thus, the manual pull station is distinct in requiring an explicit manual action to return to a state of readiness.