The smoke detector can only be reset from the detector itself using a ______.

• A. Reset Key
• B. MRT
• C. Manual Switch
• D. Test Button

Answer: (B)

Reset after an alarm is a deliberate action that clears the alarm latch only after the issue has been checked. For this detector, that reset must be done at the unit itself using a Manual Reset Tool (MRT). The MRT is a dedicated tool designed to interface with the detector’s reset input, ensuring the reset process is intentional and authorized and preventing accidental resets from other controls. Other options aren’t appropriate here: a Reset Key isn’t the required method for this model, a Manual Switch would bypass the proper reset sequence or disable the device, and the Test Button is meant for a self-test, not for clearing an alarm. So, the MRT is the correct mechanism because it performs the correct, intended reset at the detector.