Web3 nov. 2024 · Jan 12, 2015. #1. Hi. It seem as though our Wired Magnetic Door Alarm Surface Contact may be dying. Not sure how these work but over the last few weeks … Web21 jul. 2024 · The reed switch is an electrical switch operated by a magnetic field. In it's most basic form, the switch consists of a flexible ferromagnetic metal contacts inside a sealed glass tube. When a magnet is brought close to the 'reeds', the reeds move so that they come into contact, closing the switch.
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