Magnetic contacts are the first line of defence in the burglar alarm industry. They are inexpensive, very reliable, and in most cases out of sight. While PIR's and other interior detectors are an excellent back up, it is the contact that immediately triggers the alarm system when the door or window is open.
Contacts should be used on all entry sights because a PIR will pick up the intruder after they are inside.
A reed switch is the heart of a
magnetic contact. It is nothing more than a simple switch that turns on
and off with a magnet. When you put the magnet near the reed the two
blades inside the glass will close at the same time. When the magnet is
withdrawn the reed blades will open causing the circuit to open and the
alarm to be triggered.
A variety of sizes and styles make magnetic contacts ideal for easy
installation in virtually any residential or commercial application.
Complete Honeywell Magnetic contacts chart
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