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VEL-HAA28 Magnetic door sensor reed switch , Normally Closed
US$3.15
This sensor is essentially a reed switch, encased in an plastic shell. Normally the reed is 'closed'.  The other half is a magnet. When the magnet is less than 23mm away, the reed switch closes to create a circuit. They're often used to detect when a door or drawer is open, which is why they have mounting tabs. You can mount them by using screws ro hold them in place.
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