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X-Limiter™ Hinge-Mount for S&C SMD®-20 Fuse
Mounting AsseMbly And instAllAtion instructions
MN132018EN November 2016
Product information
CAUTION
Eaton’s Cooper Power series X-Limiter Hinge-Mount
fuse is designed to be installed in accordance with
normal safe operating procedures . These instructions are
not intended to supersede or replace existing safety and
operating procedures . READ ALL THE INSTRUCTIONS
BEFORE INSTALLING THE X-Limiter Hinge-Mount fuse .
The Hinge-Mount fuse should be installed and serviced
only by personnel familiar with good safety practice and
the handling of high-voltage electrical equipment .
Introduction
The X-Limiter Hinge-Mount, Full Range current-limiting fuse
has been adapted to fit the S&C SMD
®
-20 cutout mounting.
The use of the S&C standard end fittings allow for complete
interchangeability with fuses mounted in S&C SMD-20
cutouts.
CAUTION
Do not install fuse units if the blown fuse indicator has
been damaged or destroyed, as the fuse’s moisture seal
will be damaged, which may cause fuse failure .
Retrofit installation of X-Limiter hinge-mount fuse
Initial retrofit installation includes removing the existing
fuse from the S&C SMD-20 cutout and replacing it with the
X-Limiter fuse in accordance with the following steps.
1. Removal of fuse in the S&C SMD-20 cutout:
A. The fuse will be in an open position after it has
operated.
Remove it from the mounting using a
standard insulated hotstick
.
B.
Loosen the upper- and lower-end fitting-clamp
screws .
With a screwdriver, force the upper-end
fitting clamp apart slightly, and slide both end fittings
off the upper end of the fuse unit.
C.
Save the end fittings for use with the X-Limiter
fuse .
Figure 1 .
Clamp Screw
Current
Transfer
Surface
Locating Pin
Upper Seal
Locating Slot
Inward Dimple
Notch
Locknut
Clamp Pad
Clamp Screw
Actuating Pin Through
Upper Seal When Fuse
Unit Is Blown
Upper End Fitting
Full-Range
Current-Limiting
Fuse
Lower End Fitting
Line illustration of X-Limiter hinge mount for
S&C SMD-20 fuse mounting .
2. Assembly of X-Limiter hinge-mount current-limiting
fuse: When shipped from the factory, the X-Limiter fuse
will be readily equipped for installation.
3. Attachment of end fittings on the X-Limiter fuse:
A.
The lower end fitting must be attached first .
The X-Limiter fuse has a notch in the bottom which
receives the S&C end fitting wedge. Care must be
taken to hand tighten the bolt such that the end
fitting wedge is in the fuse notch. When properly
installed, the bottom of the fitting is even with the
bottom of the fuse, to about 1/8” above the bottom
of the fuse, and the inward dimple is centered and
visible on the opposite side of the fittings. (Location
of notch and inward dimple are shown in Figure 1.)
When the end fitting is properly located tighten the
clamp screw and locking nut securely.
CAUTION
If upper and lower contacts are not properly aligned DO
NOT FORCE . Loosen clamp screws and realign .
B. Slide the upper end fitting over the X-Limiter fuse.
Align the locating pin inside the end fitting with the
locating slot of the fuse and slide it down. When the
locating pin is placed in the slot, tighten the clamp
screw securely. (Refer to Figure 1.)
