S&C Instruction Sheet 465-500 23
Troubleshooting
STEP 3.
Swing the Loadbuster tool toward the VacuFuse
Self-Resetting Interrupter and pass the
Loadbuster pull-ring hook through the pull-ring
on the VacuFuse Self-Resetting Interrupter. The
pull-ring latch will defl ect and, upon complete
entry of the pull-ring, will spring back, locking
the Loadbuster tool to the pull-ring. The
Loadbuster tool is now connected across the
upper contacts of the VacuFuse Self-Resetting
Interrupter, as shown in Figures 23 and 24 on
page 21.
STEP 4.
To open the circuit, operate the Loadbuster tool
with a fi rm, steady pull until it is extended to its
maximum length. A downward pull to open the
VacuFuse Self-Resetting Interrupter extends
the Loadbuster tool and charges the tool’s
internal spring.
At a predetermined point in the opening
stroke, a trigger inside the tool will trip, releas-
ing the charged spring, separating the internal
contacts and interrupting the circuit. See
Figure 27. Successful operation is independent
of the speed with which the VacuFuse Self-
Resetting Interrupter is opened. Avoid jerking
and hesitation. The resetting latch will keep it
open. Generally, there is no indication of circuit
interruption, the only sound is that of the Load-
buster tool tripping.
WARNING
Use care when operating the Loadbuster tool .
Careless manipulation of the Loadbuster tool can
decrease the open gap to the point where a flashover
will occur . This can result in arcing, electrical shock,
serious injury, or death .
STEP 5.
To detach the Loadbuster tool after circuit
interruption, fi rst raise it slightly and disengage
the anchor from the attachment hook.
STEP 6.
Bring the VacuFuse Self-Resetting Interrupter
toward the dropout position. Then, remove the
Loadbuster tool from the pull-ring by rotating
the pole. This will defl ect the pull-ring latch to
release the pull-ring.
Because the VacuFuse Self-Resetting
Interrupter will drop fully open from gravity, it
may be preferable to remove the Loadbuster tool
by “rolling” it off both the attachment hook and
pull-ring at the same time by twisting the pole
after the Loadbuster tool has been tripped and
fully extended.
Figure 27. The Loadbuster tool attached to a VacuFuse Self-
Resetting Interrupter.
