The alarm will activate when the magnet is pulled away by the opening door or window.
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Here i install a magnetic door contact on a pvc door and wire it to a honeywell ade gen4 alarm panel.
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Magnetic door contacts are normally wired to the entry.
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Mount the magnet to the door or window and mount the switch to the frame.
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Wire contacts to an alarm system to alert when doors or windows are opened.
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Spdt switches connect to an alarm system and to another device such as a motion detector.
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