S&C Electric Company
Type XS Fuse Cutouts
S&C Type XS Fuse Cutouts, when fused with S&C Positrol® Fuse Links
provide full-fault-spectrum protection to overhead distribution systems
rated 4.16 kV through 25 kV*, whether applied to overhead transformers,
capacitors, cables, or lines. "Full-fault-spectrum protection" means that
Type XS Cutouts interrupt all faults . . . from the lowest current that
will melt the fuse link to the maximum rated interrupting current -
whether the fault is on a transformer primary or secondary - with
line-to-line or line-to-ground voltage across the cutout - regardless of
transformer winding connections - and with the capability of handling the
full range of transient-recovery-voltage severity associated with these
conditions.
S&C Positrol Fuse Links possess melting time-current characteristics
that are accurate not only initially but also on a sustained basis; this
permanent accuracy is achieved principally through the design and
construction of the fusible element. The silver or nickel-chrome elements
in S&C Positrol Fuse Links are drawn through precision dies to very
accurate diameters, assuring initial accuracy. And Positrol Fuse Links
feature solderless construction—elements are swaged to their terminals to
produce a permanent connection that is unaffected by vibration,
corrosion, or aging.
All S&C Type XS Cutouts employ single venting - down and away only -
an especially important feature where exhaust must be kept out of other
phases in overbuilt circuits. Their nonexpendable fuse-tube cap
construction, moreover, eliminates the extra expense of fuse-tube cap
replacement.
Type XS Cutouts have been expressly designed for superior mechanical
performance. Fusing is simple, even with gloved hands. Type XS Cutout
fuse tubes are readily inserted in the cutout hinge and easily closed,
without any need for careful steering or manipulation on the part of
operating personnel - even from extreme angles and under adverse
conditions of light and weather. And Type XS Cutouts can be opened and
fuse tubes removed with equal ease.
* Also applicable on 26.4-kV through 34.5-kV systems for protection of
single-phase-to-neutral circuits (lines or transformers) only, and
grounded-wye connected capacitor banks in solidly-grounded-neutral
(multigrounded-neutral) systems.
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