Inexpensive proximity sensor with internal reed switch, that is turned on and off by change of magnetic field strength (vertical, horizontal or longitudinal movement of magnet).
N.O. Contact (Normally Open)
Contact which is normally open. It will be closed when magnetic field is applied.
N.C. Contact (Normally Closed)
Contact which is normally closed. It will be opened when magnetic field is applied.
Transfer Contact (Form "C")
Common contact (wiper) will transfer from N.C. to N.O. contact when magnetic field is applied.
After being opened or closed by application of magnetic field, the contact will be held in this position (latched) even after removal of the magnetic field. Application of a magnetic field with reversed polarity will unlatch the contact.