Modern medium voltage switchgear, intended for indoor use for the distribution of three-phase alternating current with a frequency of 50 Hz, at a nominal voltage of up to 25 kV, in distribution networks in the industrial and commercial sector. The modular design of the Rotoblok VCB switchgear modules allows and allows any configuration and combination with the Rotoblok and Rotoblok SF switchgear module product range.

Technical data

Rated network voltage - 20 kV

Highest device voltage - 25 kV

Rated frequency / number of phases - 50 Hz / 3

Rated short-time network frequency withstand voltage - 50 kV / 60 kV

Rated withstand lightning surge voltage 1.2/50 μs - 125 kV / 145 kV

Continuous rated current - 630 A

Rated short-time withstand current - up to 16 kA (3s) / up to 20 kA (1s)

Rated peak withstand current - up to 50 kA

Resistance to internal arc effects - AFLR up to 16 kA (1s)

IP 43 protection rating -up to IP4X

Service conditions:

Ambient temperature

- peak short-time + 40°C

- highest day average + 35°C

- highest annual average + 20°C

- lowest long-term - 25°C1)

Relative humidity of air

- highest day average 95%

- highest month average 90%

- highest day average vapour pressure 2,2 kPa

- highest month average vapour pressure 1,8 kPa