Key I Nterlock-Stationary Breaker 1; Optional I Nterlocks 1; Lubrication - GE AKR-30 Series Maintenance Manual

SECTION 6- lnterlocks (Cont.)
6.6 KEY I NTERLOCK-STATIONARY
B R EAKER
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.
The operation of this interlock is shown in Fig. 1 9 . When
the breaker is in the OPEN position, the end plate assem­
bly item #2 on the main shaft pivots the lever item #6
counter-clockwise. This removes the pin item #3 on the
lever from blocking the lock bolt. Extending the lock bolt
rotates the li nkage which moves the trip shaft, preventing
the mechan ism from closing the breaker.
1 .
Lock
2.
End Plate
3. P i n
4 . Lock Bolt
5 .
P i n
6 .
Leve r
SECTION 7-Breaker Maintenance
SAFETY PRECAUTION
WARNING :
B EFORE INSPECTING OR BEGIN­
NIN G A N Y MAINTENA NCE W O R K ON THE
BREAKER, IT MUST BE DISCONNECTED FROM
ALL VOL TA G E SOUR CES, B O TH PO WER AND
CONTROL, AND THE BREAKER MUST BE IN THE
"OPEN" POSITION.
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/ " -�
/' � \ �-� \
, e I ;
(
' ' " '- / /
' "--- -- - - - /
FIG. 1 9 - K EY I NTERLOCK-STATIONARY B R EAKERS
When the breaker is in the C LOSED position , the fly­
wheel assembly item #2 is away from the lever item #6.
The lever is spring loaded and rotates clockwise causing
its pin to block the lock bolt extension.
6.7 OPTIONAL INTERLOCKS
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.
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7.1 L U B RICATION
In general, the c i rcuit breaker req u i res moderate
l u brication. The majority of the factory l ubricated bear­
i n g poi nts and s l iding surfaces are accessi ble for i nspec­
t ion and if necessary, c leani ng and rel ubricat i ng. The on­
ly l u bricant used on the breaker for both electrical and
mechanical areas is General Electric specification
D50H D38 (D6A1 5AI Mobilgrease 28 or 32).
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