What type of device is used to detect the opening of doors or windows in a security system?

Alarm contacts are specifically designed to detect the opening of doors or windows in a security system. They typically consist of two parts: a magnet and a switch. When the door or window is closed, the magnet and switch are aligned, keeping the circuit closed. If the door or window is opened, the magnet moves away from the switch, breaking the circuit and triggering an alarm. This makes alarm contacts a reliable choice for creating a secure perimeter in various environments.

While other devices, such as motion sensors, surveillance cameras, and glass break sensors, contribute to overall security, they serve different functions. Motion sensors detect movement within a designated area, which is useful for monitoring spaces after entry is gained but doesn't directly indicate whether a door or window has been opened. Surveillance cameras provide visual monitoring and recording but do not actively trigger alarms based on door or window status. Glass break sensors detect the sound frequency of breaking glass, alerting responders to a potential intrusion through windows but not through the direct monitoring of the closure status of doors or windows. Therefore, alarm contacts are the appropriate choice for door and window detection in a security system.