Siemens Sivacon S8 Planning Information page 26

Tab. 3/1: General cubicle characteristics in circuit-breaker design
Application
range
Degrees of protection
Form of internal separation
Design options
1)
Also form 4b type 7 in acc. with BS EN 61439-2 possible
2)
Information about 3WT circuit-breakers is available from your Siemens contact
3)
Information about moulded-case circuit-breakers in plug-in/withdrawable design is available from your Siemens contact
The circuit-breaker cubicles allow the installation of a
current transformer (L1, L2 and L3) at the customer con-
nection side. Information about the installation of addi-
tional transformers is available from your Siemens contact.
Cubicle with forced cooling
The circuit-breaker cubicles with forced cooling are
equipped with fans (Fig. 3/2). Controlled fans are installed
in the cubicle front below the circuit-breaker. The forced
cooling makes for an increase of the rated current of the
circuit-breaker cubicle. The other cubicle characteristics are
identical to the cubicle without forced cooling.
The fan control comes completely configured. No further
settings are required upon start-up of the switchboard. The
fans are dimensioned such that the required cooling is still
ensured if a fan fails. Failure of the fan or non-permissible
temperature rises are signalled. Forced cooling is available
for selected ACB (3WL) in withdrawable design.
The use of fans brings about additional noise emission.
Under normal operating conditions, the noise emission
may be 85 dB at the maximum. Higher noise emissions
only occur in the case of a fault.
Observing local regulations on noise protection and occu-
pational safety and health is mandatory. Rating data for
cubicles with forced cooling is available from your
Siemens contact.
- Incoming circuit-breakers
- Coupling circuit-breakers (longitudinal and transverse couplers)
- Outgoing circuit-breakers
- Direct incoming/outgoing feeders (without circuit-breakers)
- Up to IP43
- IP54
- Form 1, 2b
- Form 3a, 4b 1)
- Air circuit-breaker (ACB) in fixed-mounted or withdrawable design
- Moulded-case circuit-breaker (MCCB) in fixed-mounted design
Fig. 3/2: Forced cooling in a circuit-breaker cubicle
SIVACON S8 Planning Principles – Circuit-breaker design
Ventilated
Non-ventilated
Door cubicle high
Door divided in 3 parts
2)
3)
1
2
3
4
5
6
7
8
9
10
11
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