magneticswitch
nounUK /mæɡˈnɛtɪk swɪtʃ/
US /mæɡˈnɛtɪk swɪtʃ/
A magnetic switch is a switch that turns on or off when a magnet comes near it.
The door alarm uses a magnetic switch to tell when the door opens.
OTHER MEANINGS
2. A switch in which a magnet moves a metal part to open or close an electric circuit.
The old flashlight clicked on with a magnetic switch.
3. A safety device on a machine that stops it when a magnetic field is broken.
The factory machine has a magnetic switch that cuts power if the guard is lifted.
4. A reed contact sealed in glass that closes when a magnet is nearby.
Technicians tested the magnetic switch inside the glass tube.