Key Interlock-Stationary Breaker; Optional Interlocks; Breaker Maintenance; Lubrication - GE AKR-30 Series Maintenance Manual

SECTION &-Interlocks (Cont.)
KEY I NT ERLOCK-STAT IONARY
6.6
B REAKER
The function of the Key Interlock is to prevent an open
breaker from being closed when the lock bolt is extended
and its key is removed.
of
The operation this interlock is shown in Fig.
the breaker is in the OPEN position, the end plate assembly
on the main shaft pivots the lever counter-clockwise. This
removes the pin on the lever from blocking the lock bolt.
Extending the lock bolt rotates the linkage which moves the
trip shaft, preventing the mechanism from closing the
breaker.
Lock
End Plate
1.
Pin
2.
Lock Bolt
3.
4.
5. Pin
Lever
6.
FIG. 1 9 - KEY INTERLOCK-STATIONARY B R EAKERS
SECTION 7- Breaker Maintenance
SAFETY PRECAUTION
WARNING:
BEFORE INSPECTING OR BEGIN­
NING ANY MAINTENA NCE WOR K ON THE
BREAKER, IT MUST BE DISCONNECTED FROM
ALL VOL T AGE SOURCES, BOTH POWER AND
CONTROL. AND THE BREAKER MUST BE IN THE
"OPEN" POSITION.
18
O PTIONAL INT ERLOCKS
6.7
The optional interlocks are key interlocks and door inter­
locks. On drawout breakers, these devices are mounted in
the equipment and are part of the breaker enclosure. Pad­
locks may be used to lock the "inner" house in the "discon­
19. When
nected" position.
When the breaker is in the CLOSED position, the
flywheel assembly is away from the lever. The lever is
spring loaded and rotates clockwise causing its pin to block
the lock bolt extension.
6
7.1 LU BRICATION
In general, the circuit breaker requires moderate
l ubrication. The majority of the factory l ubricated bear­
ing points and sliding surfaces are accessible for inspec­
tion and if necessary, cleaning and relubricating. The on­
ly l ubricant used on the breaker for both electrical and
mechanical areas is General Electric specification
D50HD38 (Mobilgrease 28).
5
' .