GE Industrial Solutions Power-Vac ML-20 Mechanism - Manual (Page 6)

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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 (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 (1, 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.
Figure 2 Rating interference plate
1. Rating interference plate
2. Lifting locations (3/4” dia. hole at all four corners)
4.2.2 Closing Spring Interlock
This racking-track operated interlock (4, Figure 18) prevents
racking into or out of the metalclad compartment a breaker
that has the closing spring charged. This action is
accomplished by a roller on the right side of the breaker
mechanism which contacts the racking mechanism and
discharges the closing spring, unless the breaker is in the
“DISCONNECT/TEST” position or the “CONNECT” position in
the metalclad compartment. This interlock also opens the
CL/MS switch in the motor circuit to prevent electrical
charging of the closing spring when the breaker is between
the “DISCONNECT/TEST” and “CONNECT” position in the
metalclad compartment.
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1
1
10
6
7
2
4
8
3
2
5
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