14 S&C Instruction Sheet 465-500
Operation
STEP 2.
Remove the VacuFuse Self-Resetting
Interrupter from its mounting, if required,
following the steps in the “Removing the
VacuFuse Interrupter from the Cutout
Mounting” section starting on page 18. This
creates a visible “open gap” showing the
transformer is isolated from the feeder.
Depending on your utility’s standard practices,
additional grounds may be required.
STEP 3.
Follow your utility’s standard practice for
performing transformer maintenance. After
any necessary maintenance or 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.
Understanding the LED Indicators and
Position Indicator
LED Indicators
There are two LED indicators on the base of the VacuFuse
interrupter. See Figures 11 and 12.
The HEALTH INDICATOR LED is white and indicates
the “health” state of the VacuFuse interrupter. When the
VacuFuse interrupter is powered, the LED will flash white
at a 30-second interval to indicate a healthy condition.
If the VacuFuse interrupter is in an unhealthy state, the
white LED will “fast blink” at a one-second interval. If
the LED is off, that indicates the MODE SELECTOR lever
is down or the VacuFuse Self-Resetting Interrupter is no
longer powered.
The NR (Non-Reclose) LED is amber and will flash at
a 2-second interval when the VacuFuse interrupter is in
NR
mode. See the “Setting the MODE SELECTOR Lever”
section on page 16 for more details about the modes. When
the VacuFuse interrupter is in the
Auto
mode, the amber
LED remains off.
NOTICE
At least 1 .0 ampere of primary current must be flowing
through the VacuFuse Self-Resetting Interrupter to
power the control from its sleep state and illuminate
the HEALTH INDICATOR and NR LEDs . When
powered, the control will remain powered if the
transformer primary current does not fall below 1 .0
ampere . If less than 1 .0 ampere of primary current is
present, the VacuFuse Self-Resetting Interrupter will
still respond properly to fault current .
Figure 11. The HEALTH INDICATOR LED.
Figure 12. The NR (Non-Reclose) LED.
HEALTH
INDICATOR
LED
NR LED
