Definitions for "Reed switch"
is a type of alarm activated when the contact is opened or closed . It is widely used with doors, windows, roller shutters etc. and can also activate a switcher to bring the nominated camera up for extended viewing.
This type of alarm activating device becomes active when contact is either opened or closed, as in a door or window being opened or closed. They are also capable of switcher activation to activate the relevant security camera.
an assembly containing ferromagnetic contact blades, hermetically sealed
Keywords:  magnet, elwood, switch, reed, siren
Special type of relay consisting of five moving, reed-like contacts controlled by an electromagnet where the reeds themselves are part of the magnetic as well as the electrical circuit being controlled.
A reed switch is a passive device consisting of two reed contacts sealed inside a glass tube which operates when brought near a magnetic field.
an electric switch A switch is a device for making or breaking an electric circuit, or for selecting between multiple circuits
Keywords:  tiny, glass
a tiny glass