Bistable relays, also known as latching relays, are a type of electromagnetic switch that can maintain one of two stable states without continuous power supply. Unlike conventional relays, which require constant power to stay in a given state, bistable relays “remember” their position even when the power is turned off. This feature makes them an important component in various electrical and electronic applications, offering energy efficiency and durability.

The Basic Functionality of Bistable Relays A bistable relay operates using an electromagnetic mechanism, much like a standard relay. However, its defining characteristic is its ability to hold two distinct positions: one energized and one de-energized. These positions are achieved through the use of a special design that allows the relay to latch into either state when triggered. In the energized state, current flows through the relay, completing a circuit and activating the connected device. When the relay switches to the de-energized state, the current is interrupted, and the device is turned off.