How does the magnetic latching relay work?

The working principle of magnetic retention: When a current is applied to a coil in different directions, the coil generates a magnetic field of different polarity, and then attracts or repels a permanent magnet inside. The magnet is used to pull the switch contacts to close or open! The magnetic latching relay control coil does not need to be energized for a long time, only one pulse can be controlled to open or close. The operating principle of the magnetic latching relay is that after the excitation coil is energized (DC), it will be pulled up. After the excitation coil is de-energized, it will still maintain the pull-up state under the action of residual magnetism. If appropriate reverse current is applied to the excitation coil, the residual The relay can only be released under the effect of magnetism. In the process of developing magnetic latching relays, Yuanze Electric found that it is inconvenient to have only one coil in practical applications, so magnetic latching relays usually have two coils, one for sucking up and the other for releasing!