A Latching relay works electrically like a normal relay, though it maintains its position even after power has been removed. This means that it'll keep in either the “rest” or “set” position till consequent input of power. This allows it to own a basic memory attribute. An example of a latching relay would be once multiple light switches control one light. The relay can need to remember what position it had been in so that it will properly flip the light on or off. If the relay had not “latched”, the light switch wouldn't be within the correct position to vary the light’s standing. A latching relay is a relay that solely attracts power throughout the brief voltage pulse required to create it changes state. These are very useful in situations where energy efficiency is important, but also in situations where you need the relay to remember its state – typically so that the user will press a button to shut the relay and press a second button to open the relay once more...