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The most important components of the device are:
- Two disk-type thyristors in an anti-parallel connection
- A firing circuit, which, depending on the version, triggers a thyristor in the blocking direction at a defined voltage
- A module to detect the voltage at the de-excitation/discharge resistor, detect the current being conducted, identify when the overvoltage protection device triggers and signal the status using binary outputs.
- The power connections C, D (copper bars)
- Terminal XEW1 to connect the sensor cable from the de-excitation/discharge resistor.
- An "Optional fast de-excitation" module (Option G11).
The module allows the thyristors to be fired at any time by controlling three fast relays that are independent of one another.