This is a small device called a reed switch. When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes. When the magnetic field is removed, the reeds separate and the switch opens. This makes for a great non-contact switch. This switch can carry up to 1.2A. Documents: * Datasheet * Hookup Guide * Application Note https://elecena.pl/product/633661/reed-switch 2008-04-21 https://elecena.pl/product/633661/reed-switch 2008-09-23 https://elecena.pl/product/633661/reed-switch 2008-10-18 https://elecena.pl/product/633661/reed-switch 2008-11-16 https://elecena.pl/product/633661/reed-switch 2015-01-01 https://elecena.pl/product/633661/reed-switch 2016-11-25 https://elecena.pl/product/633661/reed-switch 2016-11-28 https://elecena.pl/product/633661/reed-switch 2016-11-30 https://elecena.pl/product/633661/reed-switch 2016-12-09 https://elecena.pl/product/633661/reed-switch 2016-12-13 https://elecena.pl/product/633661/reed-switch 2017-11-10 https://elecena.pl/product/633661/reed-switch 2017-11-13 https://elecena.pl/product/633661/reed-switch 2017-11-24 https://elecena.pl/product/633661/reed-switch 2017-11-28 https://elecena.pl/product/633661/reed-switch 2018-05-05 https://elecena.pl/product/633661/reed-switch 2018-11-21 https://elecena.pl/product/633661/reed-switch 2018-11-27 https://elecena.pl/product/633661/reed-switch 2022-02-22 https://elecena.pl/product/633661/reed-switch 2025-04-12 https://elecena.pl/product/633661/reed-switch 2025-04-14