Which type of alarm indicates a break-in?

The burglar alarm specifically indicates unauthorized entry into a building or property, making it the most appropriate choice for signaling a break-in. These alarms are designed to detect intrusions and typically respond by sounding an alarm and notifying law enforcement or security personnel.

In contrast, a panic alarm is intended for emergencies where an individual needs immediate assistance, such as in a threat to personal safety, rather than specifically a break-in. A fire alarm detects smoke or fire hazards, triggering an alert for fire emergencies. An intruder alert may serve a similar purpose to a burglar alarm but is generally a broader term that might not be as formally recognized or defined in alarm systems as a burglar alarm is. Thus, the burglar alarm is the clear choice when specifically discussing indications of a break-in.