S&C Instruction Sheet 465-500 13
Operation
Figure 9. A VacuFuse Self-Resetting Interrupter in the Open
position.
If the VacuFuse Self-Resetting Interrupter is
Found Open
WARNING
Do not close the VacuFuse Self-Resetting Interrupter
found in the
Open position using the OPEN/CLOSE
lever until the cause of the fault current has been
determined and repaired . The VacuFuse interrupter
is designed to protect distribution transformers from
internal and external fault current . Closing without
repairing the fault could result in equipment damage,
injury, or death .
After responding to an overcurrent event, in either the
Auto
or the
NR
mode, the VacuFuse interrupter’s vacuum
interrupter will open and the
Position
indicator will
show a green target. Opening the vacuum interrupter
disconnects the VacuFuse interrupter’s sensing and
display functions from line power, and all LEDs will be
inoperative after one minute. See Figure 9.
Follow these steps if the VacuFuse Self-Resetting
Interrupter has operated and is in the
Open
position:
STEP 1.
Remove the VacuFuse Self-Resetting
Interrupter from its mounting, if required by
utility practice, following the steps in the
“Removing the VacuFuse Interrupter from the
Cutout Mounting” section starting on page 18.
STEP 2.
Determine and resolve the cause of the fault.
STEP 3.
After the cause of the fault has been determined
and after any necessary repairs have been
completed, install the VacuFuse Self-Resetting
Interrupter to its mounting and close it into
the mounting following the steps in the
“Installation” section starting on page 9.
If Maintenance is to be Performed on the
Transformer
Follow these steps if maintenance is to be performed on
the transformer:
STEP 1.
Open the vacuum interrupter inside the
VacuFuse Self-Resetting Interrupter by pushing
up on the OPEN/CLOSE lever fi rmly using the
straight prong of the Talon tool or a distribution
prong. See Figure 10.
Figure 10. Opening the VacuFuse interrupter by pushing up on
the OPEN/CLOSE lever.
OPEN/CLOSE lever
