The XP3508 1000 is a Battery Voltage Monitor used in level crossings to monitor the battery voltage levels. In the event the battery voltage drops below the preset threshold for more than 10 seconds the unit latches several voltage free contacts. The voltage free contacts are used to signal an alarm state. Resetting the unit from an alarm state can be achieved either locally via the toggle switch or remotely by linking two connector pins. The preset thresholds are adjustable via the rear panel trim pots. Feature include Adjustable Switching threshold, ruggedised aluminium construction, high reliability and is available off the shelf.