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标题: Understanding Latching Relay: Principles, Advantages, and Applications A Latching relay is a unique type of electromagnetic switch that maintains its state even when the control power is removed. Unlike conventional relays, which require continuous energizing to hold either the open or closed position, a latching relay “remembers” its last state. This property makes it highly valuable in applications where energy efficiency and long-term state retention are essential. Working Principle The basic working principle of a latching relay relies on magnetic or mechanical means to hold the contacts in place. Typically, latching relays come in two main types: single-coil and double-coil. A single-coil latching relay requires a pulse of current in one direction to switch the contacts, and a pulse in the opposite direction to return them. In contrast, a double-coil latching relay uses one coil to set the contacts to the closed position and another coil to reset them to the open position. Once the contact state changes, the relay maintains that state without continuous power.