A latch relay, also known as a latching relay, is a type of electromechanical relay that uses a pulse of current to change the position of its contacts, and then remains in that position until it receives another pulse of current to change its position back. This allows it to function as a type of switch that can be latched in either an on or off state without requiring continuous power to maintain its state.

Latch relays are commonly used in applications where it is necessary to maintain the state of the switch even if power to the circuit is interrupted.

For example, they are often used in safety-critical applications such as emergency stop switches, where the switch must remain in its off state even if power is lost.

Latch relays are also used in certain types of memory circuits, where they can be used to store data without requiring continuous power. They are available in a variety of sizes and configurations, and can be designed for use in AC or DC circuits.

In summary, a latch relay is an electromechanical switch that can be latched in either an on or off state without requiring continuous power. They are commonly used in safety-critical applications and in certain types of memory circuits.

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