Gebildet 6pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch,Magnet Near - Connect Circuit, Magnet Away - Break Circuit,Magnetic Switch(Cylindrical,Black)

These work as expected. Good value, not worth spening more for a basic reed switch like this. Not much to get wrong. Both sides are fully potted, so should last a long time even in weather.. The magnet housing can be trimmed shorted if needed, there is probably 1/4" of empy space at the end. Simple install, just drill two holes and push them in. If you want a precise position, say for indicating whether a door is fully latched, you will need to offset the magnet as the magnetic field extends beyond the housing and will trip the reed switch before they are lined up. In my experience, these need to be offset by roughly one unit width; test with a muktimeter before install. Also, they seem to have enough reach to work across a half-inch gap.

Their definition of NC and NO are reversed. Also, they will not break a load of 12Vdc @ .2amps. Complete garbage and waste of money.

switch does NOT turn off when magnet is removed.

OK Buoni

Bei der Sanierung meiner Holzfenster habe ich Magnetkontakte eingebaut und diese mit den Binäreingängen der KNX-Anlage verbunden. Sie funktionieren einwandfrei und sind durch die Montage im Rahmen unsichtbar.

Funciona de forma eficiente

Product as described, nice switch with good activation range and length of wire.