S&C Source-Transfer PMH Pad-Mounted Gear
With Micro-AT
®
Control
Outdoor Distribution (14.4 kv and 25 kv)
S&C ELECTRIC COMPANY
s
663-503
INSTRUCTION SHEET
Page 26 of 35
August 14, 1995
The stored-energy operator’s quick-make quick-break
mechanism will stall in a partially discharged state if the
operator is inadvertently tripped while its associated
Mini-Rupter Switch is prevented from closing by any of
the following conditions:
•
Switch not completely coupled (or decoupled) to
switch operator.
•
Switch blocked open by mechanical cable interlock
(applicable when that option, Catalog Number Suffix
“-C6,” is included).
•
Switch blocked open by mechanical antiparalleling
(applicable when that option, Catalog Number Suffix
“-C7,” is included).
•
Switch locked open by key interlock (applicable when
that option, Catalog Number Suffix “-C5,” is included).
•
Switch blades blocked by insertion of the dual-purpose
front barrier in its “slide-in” position.
To determine if the quick-make quick-break mecha-
nism has stalled, observe the switch-position indicator
target. If the words “SWITCH OPEN” on the target appear
slightly off-center and one or more letters are partially
hidden from view in the target opening, then the mecha-
nism is in a stalled condition. See Figure 25.
Restore the stored-energy operator to a normal
latched-open condition after such an occurrence as
follows:
1. Make sure that the manual/automatic operation
selector switch is in “MANUAL.”
2. Place the large notched end (with recessed bolt) of the
dual-purpose manual handle in the center of the decou-
pler. See Figure 26. (The handle’s knurled knob per-
forms no function in this application.) While pivoting
the handle, push it in to engage the reverse-drive hub.
Then rotate the handle counterclockwise for the left-
hand switch (clockwise for the right-hand switch) to
back drive the switch and the quick-make quick-break
mechanism—against the tension of the stored-energy
spring—until the mechanism latches in its open posi-
tion. A slight click may be heard when the mechanism
latches.
3. Verify that the latched-open condition has been
achieved by observing that the switch-position target
reads “SWITCH OPEN” and the operator targets read
“OPERATOR IN SWITCH-OPEN POSITION” and
“OPERATOR CHARGED.”
Ç
WARNING
To guard against handle kickback during performance
of this step, do not release grip on handle until latching
has occurred.
IF OPERATOR STALLS . . .
Figure 25. Switch-position indicator target appears slightly
off-center if mechanism is stalled.
Figure 26. Dual-purpose manual handle reverse-driving the
Mini-Rupter Switch and operator’s quick-make quick-break
mechanism to recover from a stalled condition.
Normal
Stalled
