Bistable relays, also known as latching relays or bi-stable relays, are becoming increasingly popular in various industries due to their ability to maintain their state without continuous power supply. This distinctive feature sets them apart from conventional relays, where continuous current is required to keep the relay in one state. The bistable relay’s ability to latch into either of its two stable states without consuming power until a change is required offers significant energy savings and enhances the overall efficiency of electrical systems. In this article, we will explore the working principle, advantages, and various applications of bistable relays.
Working Principle of Bistable Relays A bistable relay operates on the concept of having two stable states, typically “on” and “off.” Unlike conventional relays that require a constant flow of current to maintain one of these states, bistable relays only need a brief pulse of energy to change from one state to another. This pulse can either set the relay to the “on” position or reset it to the “off” position. The relay achieves this function through an electromagnetic system with two primary components： one coil for setting the relay in one state and another coil for resetting it. The design ensures that once the relay reaches a particular state, it remains there without the need for ongoing power. The bistable nature of the relay allows it to stay in either state indefinitely until a new signal is applied.