magnetic switch
Magnetic switches are switches whose switching contacts are triggered by a magnetic field. Magnetic switches are available as robust electromagnetic components, as simple constructs that react when the magnetic flux is interrupted, and also as highly sensitive switches in power-saving chip technology.
Electromagnetic magnetic switches are installed in motor starters, simpler magnetic switches include those used in alarm systems, and high- sensitivity ones are magnetic switches in power-saving chip technology used in battery-powered applications in mobile devices or portable instruments. Another example of a switch controlled by magnetic flux is the reed relay.
The highly sensitive, non-contact magnetic switches have magnetic field sensors that generate the control voltage for the actual switching element. Magnetic flux flows through them and, when the magnetic flux direction or magnetic flux strength changes, they generate a control voltage with which the switching transistor is switched.
To increase magnetic sensitivity, GMR sensors, Giant Magneto-Resistive (GMR), or AMR sensors, Anisotropic Magneto-Resistive (AMR), can be used. Such magnetic switches are available in miniaturized form with dimensions of 1 x 1 mm.