The primary distinguishing feature of latching relays is their ability to "latch" onto a particular state after the application of a control pulse, which can be a current or voltage input. Unlike standard relays that require continuous power to maintain their position, latching relays only need a brief input to switch states. Most latching relays are designed with two coils： a set coil that switches the relay to the "on" state and a reset coil that returns it to the "off" state. This design allows them to conserve energy while maintaining their operational state, making them an attractive solution in energy-conscious applications.