Sunways PT 30k, User Manual, Page: 18 / 88

Safety precautions
16 PT 30k to PT 33k

Grid-side varistors (class III)
These protect the power semiconductors in case of high-energy, short-term
voltage peaks in the grid and dissipate the energy in the choke in case of a
grid disconnection.

Grid-side overvoltage protection (class III)
Protection against atmospheric overvoltages (e.g. caused by remote strikes
during thunderstorms).

Optional grid-side overvoltage protection (class II)
Protection against atmospheric overvoltages (e.g. caused by remote strikes
during thunderstorms).
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