The VCSD voltage-controlled short-circuiting device from the surge protection and lightning expert DEHN sets new standards. It is an intelligent short-circuit switch which is controlled by overvoltage and limits transient, temporary and long-duration overvoltage. It is capable of discharging all interference voltages except direct currents without negatively affecting the d.c. potential of cathodic protection systems. The device is ideally suited for pipelines which are interfered by lightning strikes, electric railways or high-voltage lines. The VCSD limits overvoltages and their effects in its immediate vicinity to a safe level.
The VCSD is an intelligent short-circuit switch which is controlled by overvoltage and limits transient, temporary and long-duration overvoltage. It is capable of discharging all interference voltages except direct currents. Interference voltages of a certain duration or voltage level activate functional units of the short-circuit switch which are assigned to the relevant overvoltage and short-circuit the overvoltage for the duration of its occurrence without negatively affecting the d.c. potential of cathodic protection systems.