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Interface protection system unit compliant with VDE-AR-N 4105 and VDE V 0126-1-1


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Interface protection system unit compliant with VDE-AR-N 4105 and VDE V 0126-1-1




The PMVF 80 device has been designed as an Interface Protection (IP) in accordance with VDE-AR-N 4105 and VDE V 0126-1-1 application guides.
It is used when a local generating system is connected in parallel with the electric utility.
The controls refer to limits of voltage and frequency monitoring. In the case when either the voltage or the frequency are out of admissible limits, the IP must step in by de-energising a relay output so that the interface switch (IS) trips.

PMVF 80 is equipped with 4 inputs having the following functions:

  • IS status feedback
  • R.O.C.O.F or Vector shift delay
  • Disabling signal
  • Remote tripping (forced IS opening, independent of voltage and frequency values).


Also, there are 2 relay outputs for:

  • IS opening and closing
  • Backup device opening (programmable: retentive normally energised, retentive normally de-energised or adjustable pulse).


The backup device consists of a signal contemporary or delayed respect to the IS opening command, transmitted only if the IS failed and did not complete the disconnection.
PMVF 80 also has 2 additional relay outputs to configure as:

  • Autonomous signalling in case of phase power unbalance (LSP), only if three CTs are also installed
  • Programmable alarm.

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