Smart Decoupling Device VCSD

The intelligent short-circuiting device VCSD 40 IP65 (Voltage Controlled Short-Decoupling Device) limits long-term, temporary and transient overvoltages.

The voltage-controlled short-circuiting device of the d.c. decoupler limits long-term a.c. voltages to a preset value without negatively affecting the desired d.c. potential.

Intelligent short-circuiting device VSCD

Problem: External voltages may cause a.c. corrosion at the pipeline, personal injury and material damage.

Examples of such interference are:

  • Stray currents
    caused by electric railways
  • Electromagnetic fields
    caused by high-voltage lines
  • Earth faults and short-circuits
    caused by high-voltage lines
  • Lightning interferences
    caused by thunderstorms

Such overvoltage of a certain duration or voltage level activates the VCSD and the overvoltage is discharged to earth without negatively affecting the cathodic protection potential across the pipeline (d.c. potential).

Fields of application

Typical fields of application are cathodically protected systems such as pipelines or storage tanks, indirect earthing of cable shields at accessible locations or corrosion-free connection of isolated earth-termination systems such as signal ground. The VCSD limits overvoltages and their effects in its immediate vicinity to a safe level.

Main protection goals:
  • Protection of the insulation of pipelines
  • Protection of devices and components
  • Reduction and prevention of a.c. corrosion
  • Personal protection in case of temporary and long-duration overvoltage *
Main benefits of the VCSD:
  • Flexible and controllable use in different fields of application
  • High discharge capacity
  • Tested, comprehensive and coordinated protection solution

* Limit values below the German AfK recommendation No. 3


VCSD 40 IP65 limits long-term, temporary and transient overvoltage

VCSD 40 IP65 limits long-term, temporary and transient overvoltage.