1VAL050503-MB Rev B Replaces (1VAL057485-MB Rev. C) Oct 2013
17
I
NTER
L
OCKS
:
The ADVAC™ breaker contains a number of interlocks. A description of each interlock follows as encountered during
racking of the breaker into the breaker compartment.
DANGER
MODIFICATION TO INTERLOCKS CAN RESULT IN HAZARDOUS CONDITIONS TO PERSONNEL AND
EQUIPMENT. DO NOT OVERRIDE, BY-PASS OR ADJUST
INTERLOCKS. DO NOT REMOVE OR ROTATE INTERFERENCE BLOCKING PLATE.
CAUTION
THE CLOSING SPRING MAY BE MANUALLY RECHARGED IN THE DISCONNECT AND WITHDRAWN
POSITIONS. VERIFY THAT THE BREAKER IS OPEN AND THE CLOSING SPRING IS DISCHARGED
BEFORE REMOVING THE FRONT COVER.
P
OSITION
I
NTERLOCKS
:
The Position Release Lever must be depressed in order to begin racking the breaker in any
direction from any positive position (Disconnect, Test, or Connect). The release lever is blocked from actuation when
the breaker is CLOSED. The ability to close the breaker is blocked unless the breaker is in one of the three positive
positions.
I
NTERFERENCE
B
LOCKING
:
A code plate in the breaker compartment prevents underrated breakers from being inserted
into higher rated compartments. The code plate rating includes continuous current, interrupting current, close and latch
capability and maximum voltage. Breakers with the same or higher code plate rating can be inserted into a compartment
of equal or lower value.
P
OSITIVE
P
OSITION
FOR
R
ACKING
:
The racking mechanism is blocked unless the interlock tabs are fully extended into the
compartment slots.
P
OSITIVE
P
OSITION
FOR
R
EMOVAL
:
The handle release pin prevents withdrawing the breaker from the compartment by
blocking withdrawal of the locking tabs. The handle release pin blocks the handles unless the breaker is in the
Disconnect position.
MECHANISM AND OPERATION
CAUTION
THE CLOSING SPRING MUST BE MANUALLY DISCHARGED BEFORE THE BREAKER CAN BE REMOVED
FROM THE CELL. THIS CAN BE ACCOMPLISHED BY CLOSING AND OPENING THE BREAKER WHILE IT
IS IN THE DISCONNECT POSITION.