An air activated switch is a switch that is activated by a change in air pressure. When the switch is activated, a small amount of air is released from a container, which changes the pressure in the container. This change in pressure activates a mechanism in the switch that opens or closes the switch.
Air activated switches are used in a variety of applications, including vending machines, doorbells, and security systems. They are often used in applications where it is important to have a switch that cannot be tampered with or activated by accident.