Campbell Scientific's LR4 Four-Channel Latching Relay Module is ideal for locations where power is unreliable or needs to be conserved. Unlike traditional relays that must be continuously powered to keep their state, the new LR4 mechanically latches the relay’s state, allowing power to be removed. The only way to change the state of a relay is to send a command to the LR4 or to press the manual toggle button. The LR4 is manufactured by Campbell Scientific Canada.
