To react to the change in low currents or to the movement of permanent magnets.
Two or, depending on the type of circuit, also three contact reeds are melted into a small glass tube in which a vacuum exists, or which is filled with protective gas. These reeds are magnetised and react very sensitively to
the field-lines of a permanent magnet or an electric field.
If current carrying wire is wound around a reed contact, the contact can, for example, control the
function of rear lights or indicator lamps. Other applications, with a higher switching frequency, e.g., an RPM measurement, are also possible. Due to the protection of the contacts, the service life is almost unlimited.
|Fields of application|
|Monitoring glowing system|
|Engine speed sensor|