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Reed switch work Principle

Author : KJT Date : 2015-7-20 15:46:41
How does a reed switch work?

A reed switch consists of two or three metal reed contacts (blades) that are hermetically sealed inside a glass tube containing an inert atmosphere. Reed switches come in various sizes, magnetic sensitivities, high power capabilities, high voltage capabilities, contact configurations and lead configurations.
The reed blades act as magnetic flux conductors or “magnetic antennae.” When exposed to an external magnetic field from a magnet or an electromagnetic coil, poles of opposite polarity are created across the open contact. When the magnetic force exceeds the spring force of the reed blades, the contacts will close (pull-in). When the magnetic force of the magnetic field is less than the spring force of the reed blades, the contacts will open (drop-out).