Dry reed switch is the abbreviation for dry reed switch which is a passive electronic switch component with contacts It has the advantages of simple structure small size and easy control Its shell is usually a sealed glass tube which contains two iron elastic reed plates and an inert gas called rhodium Normally the two springs made of special materials in the glass tube are separated When a magnetic substance approaches the glass tube under the action of magnetic field lines the two spring plates inside the tube are magnetized and attracted to each other causing the spring plates to merge together and connect the circuit connected to the node After the external magnetic force disappears the two spring leaves separate due to their own elasticity and the circuit is also disconnected Therefore as a circuit switch device controlled by magnetic field signals reed switches can be used as sensors for counting limiting etc mainly used in the production of door and window magnets in security systems and are also widely used in various communication devices In practical applications magnets are usually used to control the connection between these two metal plates so they are also known as magnetrons
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