A Form E type of reed contact is a latching, or bi-stable type of contact having two leads. On actuation, it stays in the last energized state, without the need for maintaining the field.
The state is altered by using opposite poles of a magnet or coil. Such types of reed contacts use a biasing magnet within. Form E type reed sensors are used primarily in elevator floor sensing applications.
Synonyms
Latching, bistable
