Latching relays, also known as bistable relays, are crucial components in modern electrical systems. Unlike conventional relays that require continuous current to maintain their state, latching relays can hold their position once switched, making them highly efficient and versatile for a wide range of applications. In this article, we will explore the workings, advantages, and common uses of latching relays.
What is a Latching Relay? A latching relay is a type of relay that has two stable states and can switch between them using an electrical pulse. It consists of two electromagnetic coils, one for setting the relay to one state (often called the “set coil”) and another for resetting it to the opposite state (the “reset coil”). Once the relay switches to one of these states, it remains in that position without requiring any further power to maintain it, which significantly reduces energy consumption. The ability to “latch” or “hold” a position without continuous power makes this relay distinct from standard relays, which need to keep a steady current flowing through their coil to maintain a particular state.
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