Back-up batteries at communication sites may be damaged by over-discharge when AC power is lost for extended periods. Unless power is restored in a timely fashion, transceivers will continue to draw current from the batteries long after any usable voltage has been drained from them. In some cases, connection to a battery at low voltage damages the transceiver itself. 

To protect site batteries and equipment against damage and to help avoid any unnecessary down-time from overdischarge situations, installation of a Low Voltage Disconnect is recommended. The LVD 12-75 contains a special sense and control circuit housed in a compact, rugged, vinyl-clad aluminum case. It is installed in-line with the power leads between the battery and the load. 

The unit continually monitors battery voltage and if it should fall below a preset (Adjustable) voltage threshold, the LVD disconnects the load, preventing further discharge. When the battery is recharging and voltage is raised above another preset voltage threshold, the load is automatically reconnected. These connect and disconnect points are user adjustable by means of potentiometers accessible through the front panel.  Latching relays make the LDV 12-75 extremely efficient with no parasitic current draw!

Note: This 12 volt LVD 12-75 model is configured for use in negative ground battery systems. 

This Low Voltage Disconnect is in excellent working condition. The Installation / Operation Manual is included!  Please see the included photos of the actual device that is for sale. 

If there are any questions, please don't hesitate to ask... and thanks for looking!