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The reed switch was invented in 1936 by WB Elwood at Bell Telephone Laboratories. It is a magnetically operated switch used in burglar alarms, electrical circuit controls, and the communications industry. It consists of ferrous metal contacts or springy metal reeds inside a sealed glass tube. The switch is activated by a magnet or magnetic field and is commonly used for doors and windows. However, it cannot hold a large current voltage and can get hot when used with a strong current.
The first reed switch was born in 1936. It was an invention of WB Elwood at Bell Telephone Laboratories. It is a specialized type of switch that works magnetically. This switch has the ability to activate a siren when motion is detected as part of a burglar alarm. It is also commonly used with electrical circuit controls and is an important device in the communications industry.
A reed switch consists of a pair of ferrous metal contacts or three springy metal reeds located inside a sealed glass tube. The two reed switch has normally open contacts which are closed during operation, referred to as (NO) contacts. The three reed type, on the other hand, has a pair of contacts (NO) and a pair of normally closed contacts, called (NC).
The switch is enclosed in a small tube, controlled by a magnet or magnetic field. It works with the help of an additional magnet, which is located a short distance from the switch. When the magnets come into contact, they come together and complete an electrical circuit. This results in a change in the contacts to an opposite state.
When the magnetic field decreases, the switch and its contacts immediately return to their original state. A magnetically operated reed switch like this one is commonly fitted to doors and windows to add protection to a home or business. The switch is small and unobtrusive enough that it can be mounted in your home or office without being noticed.
While the reed switch’s small size makes it easy to mount and use, there are some drawbacks. For example, because it is small and delicate, it cannot hold a large current voltage. Instead, the current can simply pass. In turn, excessive voltage can cause the switch to trip during use. It has also been known to get hot when used with a strong current. This can cause the switch to lose its spring-like shape.
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