Lesson.6_The Principle of Magnetic Switch

How does a Magnetic Switch work?
The work theory of Magnetic Switches is very simple, 2 pieces of magnetizing of the terminal point, place overlap and sealed inside thin glass protection, and the 2 pieces of magnetizing are presented with a small gap.
The magnetic field will be produced when the magnet near to the reed, it will make a difference polarity between the 2 pieces terminal position, the polarize in the opposite way and attract one another. A magnetic reed switch may set in normally open (and normally off), unless a magnet is positioned right next to it, when it switches on, allowing a current to flow through it.
This kind of magnetic reed switches can be used in the detection of windows, glass windows, and roll-up doors, etc.
There are various reed switches to choose from Sengate: https://www.sengate.com/category-b-b.html
#Magnetic Switch all made in Taiwan
#Sengate has many kinds of magnetic reed switches 
#Small but applicable widely