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There are three device versions depending on the rated voltage:
|
Version |
Rated voltage |
Design, installation |
|---|---|---|
|
A |
Up to 580 V |
Mounted in an enclosure. |
|
B |
Up to 725 V |
Mounted on a baseplate. |
|
C |
Up to 1 150 V |
Mounted on a baseplate. |
The power section of the overvoltage protection device has a P3C connection, 3-pulse fully controlled polygon connection. The feeders to the polygon connection have metal-oxide varistors that absorb overvoltage energy.
Semiconductor fuses included in the devices are accommodated in a fused disconnector with integrated fuse monitoring.
The break-over diodes (BOD) and RC snubbers for the thyristors and varistors are mounted on a printed circuit board as are also the gate series resistors and diodes that transfer the line voltage to the break-over diodes.