Latching Relay Board

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Latching (bistable) relay is a special kind of relay. These are also called "impulse", "keep" or "stay" relays. When the voltage is switched off, the relay remains in its last state. While a conventional relay uses power continuously when its internal switch is to be closed (relay coil energized), a latching relay require only a brief voltage pulse to change state. The relay will maintain its state when the power supply removed.

A brief (<1s) pulse to Set will close AC terminals, BC will be open
A brief (<1s) pulse to Reset will close BC terminals, AC will be open