Reed Switch
A reed switch is a passive device consisting of two Reed Blades sealed inside a glass tube with an Inert Gas, which operates when brought near a magnetic field.
The reeds are hermetically sealed in cantilever form so that their free ends overlap and are separated by a small air gap. The contact area of each blade can be coated with one of many types of contact materials such as Ruthenium, Rhodium, Tungsten, Silver, Irridium, Molybdenum etc.
Due to the low inertia of the Reed Blades and the small gap, fast operation is achieved. The inert gas inside the sealed Reed Switch not only prevents oxidation of the contact material but also helps in making it one of the few devices that can be used in explosive environments.
Post time: May-24-2024