GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 6)

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1. The breaker should be protected against condensation,
preferably by storing it in a warm dry room of moderate
temperature such as 40° - 100°F. Circuit breakers for
outdoor metalclad switchgear should be stored in the
equipment only when power is available and the heaters
are in operation to prevent condensation.
2. The breaker should be stored in a clean location, free
from corrosive gases or fumes; particular care, for
example, should be taken to protect the equipment from
moisture and cement dust, as this combination is present
at construction sites and has a very corrosive effect on
many parts.
3. Rollers, latches, etc., of the operating mechanism should
be coated with 0282A2048P009 grease to prevent
rusting.
If the breaker is stored for any length of time, it should be
inspected periodically to see that rusting has not started and
to ensure good mechanical condition. Should the breaker be
stored under unfavorable atmospheric conditions, it should be
cleaned and dried out before being placed in service.
SECTION 4—Features
4.1—Safety Precautions
This circuit breaker uses powerful springs for energy storage.
WARNING: DO NOT WORK ON THE INTERRUPTERS OR THE
MECHANISM UNLESS THE CIRCUIT BREAKER IS IN THE
“OPEN” POSITION AND BOTH THE CLOSING AND OPENING
SPRINGS ARE EITHER “DISCHARGED” OR GAGGED AND ALL
ELECTRICAL POWER IS REMOVED.
These precautions are required to prevent accidental operation.
Anyone working on the circuit breaker should be familiar with
the contents of this instruction book.
Figure 1 Front view of PowerVac breaker
with front cover
1. Front cover 6. Manual charge lever
2. Cover mounting bolts 7. Counter
3. Manual trip button 8. Spring charge indication
4. Manual close button 9. Closing spring gag access
5. Nameplate 10. Open/Close indicator
The circuit breaker has been shipped in the “CLOSED” position.
After removing packing material, open the breaker by pushing in
firmly on the manual trip button (item 3, Figure 1), while
keeping hands away from moving parts, and verify that the
operation counter advances one count.
Closing and opening springs are now in their discharged
positions. Check this by first pressing the manual close button,
then the manual trip button. The indicator flags on the front of
the breaker should show “OPEN” and “DISCHGD”. All
mechanical and electrical checks should be completed before
putting breakers in service.
4.2—Interlocks
Each PowerVac ® vacuum circuit breaker is provided with the
following interlocks:
4.2.1 Rating Interference Plate
This interlock (item1, Figure 2) permits only a breaker with a
matching continuous current, voltage and interrupting rating to
be inserted into a metalclad compartment of identical rating.
1. Rating interference plate
2. Lifting locations (3/4” dia. hole at all four corners)
An option available is the combination 1200/2000 ampere
breaker, which can be used in either a 1200 or 2000 ampere
compartment. The rating interference plate must be adjusted to
match the current rating of the compartment. This adjustment is
done by positioning the outer interference plate so that the
edge of the plate lines up with the current indicated on the label
attached to the breaker just above the rating interference plate.
Figure 2 Rating interference plate
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