NES / NES-H Duplex

The type-tested medium-voltage switchgear with withdrawable unit technology is also available as a duplex version. High availability and security of supply distinguish this system design. Switch cubicles can be arranged back-to-back or facing each other.

Pressure relief channels, single or collective absorbers and deflector plates are used to discharge hot gases arising in the event of an internal arc.

Design features and classification under standard IEC 62271-200

Busbar system Duplex
Operational availability category LSC 2B
Partition class PM or PI
Internal arc resistance classification IAC AFLR

Switchgear system

12 kV

Type NES Duplex

17.5 kV

Type NES-H Duplex

24 kV

Type NES-H Duplex

 

Rated values

max.

max.

max.

 

Rated voltage

12

17.5

24

kV

Rated power-frequency withstand voltage

28

38

50

kV

Rated lightning impulse withstand voltage

75

95

125

kV

Rated busbar current

2,500

4,000

2,500

A

Rated short-time withstand current

40

50

31.5

kA

Rated impulse current

100

125

80

kA

Rated short circuit period

3

3

3

s

Internal arc resistance

AFLR

40 kA / 1s

AFLR

50 kA / 1 s

AFLR

31.5 kA / 1 s