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GSIS9048
GSIS9051
Double insulation
The double insulation technique consists of total separation
between the power circuits and the auxiliary circuits and is a
characteristic of all SACE Isomax S apparatus from size S3 up.
The housing of each electrical accessory is completely segregated
from the power circuit, thus avoiding all risk of contact
with live parts, thereby increasing operator safety conditions
during management and inspection of the installations.
Moreover, the circuit-breaker has redundant insulation between
the internal live parts, both regarding thickness of materials
and the distances, which are greater than those required
by the IEC Standards and are in accordance with American
usage.
Positive operation
The operating lever always indicates the exact position of the
circuit-breaker moving contacts, thereby guaranteeing safe and
reliable indications (I = Closed; O = Open; yellow-green line =
Open due to release trip). The circuit-breaker operating mechanism
has free release, regardless of the pressure on the lever
or the speed of operation. Release tripping automatically opens
the moving contacts: to close them again, it is necessary to
reset the operating mechanism by pushing the operating lever
from the intermediate position to the lower limit of the open
position.
For plug-in or withdrawable circuit-breakers, the moving part
can only be detached from the fixed part with the circuit-breaker
open (moving contacts separate from the relative fixed contacts).
2
GSIS0074
GSIS9050
Selectivity
The complete range of releases means that the protection functions
of the apparatus can be coordinated according to current-type,
time-type, energy-type or residual-current selectivity
chains. It is therefore possible to isolate only the areas affected
by the fault, ensuring maximum service continuity. Circuit-breakers
in category B are available from 400 A up.
Possibility of inspection
With the circuit-breaker out of service, it is possible to check
the state of the internal parts and live components of the circuit-breaker
directly. The arcing chambers and the fixed and
moving contacts are accessible simply by removing the circuit-breaker
cover. The operation, facilitated by the limited
number of components, reduces maintenance times and ensures
a higher degree of safety.
ABB SACE
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