This unit is for use with 12VDC power supplies with standby batteries. It is designed to prevent batteries from completely discharging after prolonged mains failure by automatically disconnecting depleted batteries and automatically re-connecting the battery when power is available. A green LED indicates relay status.
It is normally fitted into the control or power supply unit or both. It connects between the battery and power supply and can be used with two batteries in parallel.
12V Battery Low Voltage Automatic Isolator