MV & HV DC Circuit Breaker


The first patent addresses an architecture of a MVDC circuit breaker. This patent introduces a time-controlled resistor module in the auxiliary circuit. This module short-circuits a resistor ‘R1’ by closing a by-pass switch ‘MS1’ for controlling the insertion time to limit the rate-of-change of current at its zero crossing and ensuring a fast interruption. It contributes to a compact and cost-efficient DCCB.

The other patent introduces an architecture of a HV DCCB based on the previous MV DCCB architecture. It exploits the phenomenon that a current commutation from a surge arrestor ’MOV1’ to a capacitor ’C2’ can generate an extended recovery period ‘∆t’ without arc to secure the interruption of current. It avoids the use of HV inductor and reduces the volume of HV capacitor.


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Interruption validated over full current range on prototype.


  • Low conduction losses
  • Cost optimized and footprint reduced
  • Load and fault current interruption
  • Easy to adapt to client requirements


  • MVDC network protection: distribution, industrial, railway
  • HVDC network protection: transmission


  • Patent pending : WO2020136340, WO2020136350
  • Design consultancy and prototyping
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