A reed switch consists of two ferromagnetic and specially shaped contact blades (reeds) positioned in a hermetically
sealed glass tube with a gap between them and in a protective atmosphere. The plated contact surfaces are isolated
from the outside environment, which protects the contacts from contamination.
Reed switches are available as form A (normally open) and form C (changeover), and are operated using a magnetic field generated by either a permanent magnet or current-carrying coil.
The features that make the reed switch a valuable tool include compact size, low weight, quick response time,
long life and low cost.
Some common applications are: reed reays, automotive sensors, robotics sensors, security sensors and toys and games.
They are also available in moulded packages affording protection from damage and in surface mount styles.
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