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magnetic contact

A magnetic contact is a component of alarm systems

such as those used in industrial and office buildings and in residential buildings. They are sensors

that areattached to windows and doors and, when opened, trigger a contact that can be used to activate an alarm

or for other purposes when the alarm system is switched on. Such an opening sensor consists of two parts that are placed close to each other. One part on the window or door frame, the second on the movable frame. In one part there is areed relay

with its switching contacts, in the other there is a permanent magnet whose magnetic flux flows through the reed relay.

Magnetic contact for alarm system, photo: sewosy.com

Magnetic contact for alarm system, photo: sewosy.com

If the part with the permanent magnet is removed from the reed relay, the magnetic flux is interrupted, which changes the signal state. This change is used to trigger the alarm.

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Englisch: magnetic contact
Updated at: 21.04.2016
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