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6.3
Basic design circuit-breaker panel, double-busbar system
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9
Fig. 18: Sectional view of circuit-breaker panel design
Switching-device compartment
A
Busbar compartment
B
Connection compartment
C
Withdrawable circuit-breaker
D
Low-voltage compartment
E
(1)
Panel A
Metallic shutters
(2)
Low-voltage connection
(3)
Operating and interlocking unit for circuit-breaker
(4)
Vacuum interrupters
(5)
Operating and interlocking unit for racking the
(6)
withdrawable part and for earthing
Feeder earthing switch
(7)
Connection for up to 4 cables per phase
(8)
(9)
Block-type current transformers
(10)
Contact system
(11)
Voltage transformers
(12)
Bushing-type insulators
(13)
Busbars
(14)
Pressure relief duct
(15)
Panel B
Further information to design features and design options is given in catalog HA 25.71.
139-2021.9 / 07
NXAIR M
Panel design
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