Bistable relays, also known as latching relays or keep relays, are a type of electrical switch that can maintain two stable states without requiring continuous power to stay in either state. Unlike conventional relays, which require constant electrical power to maintain their position, bistable relays consume energy only during state changes. This feature makes them energy-efficient, reliable, and highly suitable for a variety of applications, from industrial control systems to consumer electronics. In this article, we will explore the working principle, applications, and advantages of bistable relays, and how they are revolutionizing the way we approach electrical switching.