What is the main function of a relay in an alarm system?

The main function of a relay in an alarm system is to control high power circuits. Relays are electrically operated switches that allow a low voltage circuit to control a higher voltage circuit without needing the operator to handle high voltage directly. This is particularly important in alarm systems where the activation of alarms, sirens, or other devices often requires a greater amount of current than the control panel can provide.

In an alarm system, when the system detects a trigger—like an unauthorized entry—the relay can energize and close a circuit that activates alarms or sends notifications. This means the alarm system can operate safely, relying on low-voltage signals to control more powerful devices without compromising user safety or system integrity.

Other options, such as converting AC to DC or creating clean electricity, pertain to different functionalities that do not represent the primary role of a relay in this context. Furthermore, while relays may indeed help in switching devices on and off, the key aspect here is their ability to safely manage and switch the higher power loads that are often found within alarm systems. Thus, controlling high power circuits remains the most fitting description of a relay’s function in this scenario.