Latching relays, also known as bistable relays, are crucial components in modern electrical systems where power efficiency and space-saving designs are essential. Unlike conventional relays, which require continuous current flow to maintain their switching state, latching relays are designed to retain their position even after the power supply is removed. This unique characteristic makes them highly efficient and versatile for specific applications that require long-term state retention without constant energy consumption.

What is a Latching Relay? A latching relay operates in a manner that allows it to “latch” onto a specific position (either open or closed) after it has been activated, even when the power is turned off. This is in contrast to standard relays, which need continuous power to maintain their state. Latching relays are typically comprised of two electromagnetic coils or windings: one for setting the relay (switching it to the “on” position) and another for resetting it (switching it back to the “off” position). When an electrical pulse is applied to one of these coils, the relay either engages or disengages, remaining in that state until a pulse is sent to the opposite coil.