Blue Sea 7615 ATD Automatic Timer Disconnect [7615]ATD Automatic Timer Disconnect Adjustable time or voltage based battery disconnect automatically shuts off devices to preserve battery power 12V signal triggers relay to connect battery power to devices. When signal is removed the timer is activated and will disconnect devices after a preset time Disconnect can be triggered based on time, low voltage, or removal of 12V signal Low voltage will disconnect if time hasn_t been reached to preserve battery