What is a Bistable Relay? A bistable relay, also known as a latching relay, is an electromechanical device that has two stable states. Unlike conventional relays that require continuous power to maintain their state, bistable relays can hold their position without a constant power supply. This characteristic makes them energy-efficient and suitable for applications where power consumption and space are critical factors. Operation Principle The operation of a bistable relay is based on the principle of mechanical latching. It consists of two coils, a set coil, and a reset coil, which control the relay's two stable positions. When current flows through the set coil, it generates a magnetic field that attracts the relay's armature, causing it to physically move and latch into position. The relay remains in this state even after the current is removed. Similarly, applying current to the reset coil generates an opposing magnetic field that pulls the armature back ...