What is a 'release device' in fire systems, and what does it control?

• A. It triggers audible alarms only when manually tested.
• B. It monitors door status in real time.
• C. It releases doors or other hardware in an alarm; triggers safety actions.
• D. It is used to power down equipment after an alarm.

Answer: (C)

A release device is the part of a fire alarm system that, when the system goes into alarm, activates the release of doors or other safety hardware to enable safe evacuation and appropriate safety actions. It connects to door locking mechanisms (like magnetic locks or electric strikes) and energizes or de-energizes them so doors unlock or release as required during an alarm. This flow helps keep egress clear and can coordinate other actions such as triggering dampers or initiating elevator recall as part of the fire strategy. It’s not about simply monitoring door status or powering down equipment or sounding alarms—the release device specifically controls the mechanism that unlocks or releases hardware during an alarm.