The catenary voltage of DC railways must be measured before individual sections can be connected. An electrical connection of those sections may only take place in case all voltage values are within a certain range.

The devices monitor the driving voltage of individual sections and supply information about the voltage values and shows if they are within the allowed range. The device does not need any auxiliary power supply and is intended for top-head rail mounting.

If all catenary voltages of the track sections that are to be interconnected lie within the allowed ranges, the interconnection between the track sections can be enabled.

Witt offers the following products for driving voltage monitoring:

 DVM 100

 DVM 300