Latching Relay Basics - Basic working principle in 2 minutes

The video explains the function and benefits of latching relays in electrical circuits. It begins with a description of how electromagnetic relays work, resetting when de-energized. The need for latching relays is highlighted using an elevator call button example, where the light remains on to indicate the elevator's arrival. The video details the design of latching relays, consisting of three circuits and a piston. It describes the operation of these relays in an elevator system, emphasizing their ability to maintain position without continuous power. Finally, the video outlines the benefits of latching relays, such as positional memory and efficiency.

How does the piston in a latching relay maintain its position after the call button is released?

What is the benefit of having positional memory in latching relays?