itsce-604050012 - SACESales.com
itsce-604050012 - SACESales.com
itsce-604050012 - SACESales.com
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Only the following are an exception:<br />
– the mechanical interlocking plate for<br />
two superimposed circuit-breakers<br />
– the bracket for fixing onto DIN rail (for<br />
S3X and S4X)<br />
The wiring diagrams are those of the<br />
corresponding SACE S2, S3, S4 and S6<br />
circuit-breakers.<br />
Apart from S2X 100 which are identical<br />
to the corresponding S2 B/N/S, of the<br />
circuit-breakers, the S3X, S4X and S6X<br />
current-limiting circuit-breakers keep<br />
the standardised depth of 103.5 mm,<br />
standardised widths of 105 mm (S3X-<br />
S4X) / 210mm (S6X) for the three-pole<br />
versions and 140 mm (S3X-S4X) /<br />
280mm (S6X) for the four-pole versions,<br />
identical drilled fixing holes for the plugin<br />
and withdrawable versions and identical<br />
drilled holes for the <strong>com</strong>partment<br />
door in all the versions and for all the<br />
accessories.<br />
Applications<br />
The current-limiting circuit-breakers are<br />
suitable for installation in all types of<br />
civil, industrial and service sector<br />
plants, as well as in electrical installations<br />
on board ships, in mines, on offshore<br />
oil rigs and, generally, wherever<br />
very high short-circuit currents can occur<br />
due to the high powers of the generators<br />
and transformers – up to 200 kA<br />
at 380/415 V AC, 180 kA at 440 V AC<br />
and 75kA at 690 V AC.<br />
The circuit-breakers can be placed<br />
near the power supply source both for<br />
general protection (plants, user groups<br />
and electrical lines) and for protection<br />
of electric machines (motors, generators,<br />
transformers, capacitor banks).<br />
They can also be inserted in plants<br />
where back-up protection is foreseen,<br />
which allows use on the load side of circuit-breakers<br />
with breaking capacity<br />
lower than the prospective short-circuit<br />
current at the point of installation.<br />
The breaking capacities of the SACE<br />
Isomax S current-limiting circuit-breakers<br />
have exceeded the best performances<br />
achieved by other apparatus of<br />
this type.<br />
3<br />
Limited<br />
let-through current<br />
Prospective<br />
short-circuit<br />
current<br />
GSIS0084<br />
The increased contact opening<br />
speed, the dynamic blast action<br />
produced by the magnetic field<br />
and the structure of the arcing<br />
chamber contribute to extinguishing<br />
the arc in the shortest<br />
possible time, limiting the specific<br />
let-through energy value I 2 t and<br />
the peak current.<br />
ABB SACE<br />
3/19
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