Circuit Breaker Draw-Out Operation; Connected Position; Test Position; Disconnected Position - GE AKD-20 AR Installation And Maintenance Manual

AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 8. Operating the Switchgear

Circuit Breaker Draw-out Operation

The circuit breaker compartment is constructed to offer four
unique positions of CONNECTED, TEST, DISCONNECTED, and
WITHDRAWN.

CONNECTED Position

In the CONNECTED position (Figure 8.1), the primary and
secondary disconnects are fully engaged. The breaker must
be tripped before it can be racked out of this position.

TEST Position

When in the TEST position (Figure 8.2), the primary contacts
are disconnected, but the secondary contacts remain
engaged. This allows complete breaker operation without
energizing the primary circuit.

DISCONNECTED Position

In the DISCONNECTED position (Figure 8.3), neither primary
nor secondary contacts are made. Breakers may be racked
between these three positions with the compartment door
closed and latched.

WITHDRAWN Position

With the door open, the breaker can be rolled out manually
from the DISCONNECTED to the WITHDRAWN position. Here,
the breaker is completely out of its compartment, ready for
removal.
WARNING: The breaker compartment door must be
closed and latched to maintain the integrity of the arc
resistant enclosure. The breaker compartment door should
not be opened when the circuit breaker is closed and in the
connected position when the equipment is energized.

Draw-out Operation

All breakers are supported on the draw-out rails mounted on
the side walls of the cassette. On EntelliGuard breakers, two
wheels on each side of the breaker rest on each draw-out rail.
Motion is provided by a mechanism mounted on the bottom
of the cassette. This mechanism drives racking cams which
engage pins anchored to each side of the breaker.
The cams are driven by a removable racking handle or
remote racking device, catalog #EGGRRLV, which engages
the mechanism. The handle is inserted through an opening in
the cassette escutcheon below the breaker.
Turning the handle in a clockwise direction drives the breaker
into the compartment. As the breaker disconnect fingers
engage the stab tips, a high force will be felt. Turn the racking
handle until the indictor barrel clearly shows CONNECTED.
The position of the breaker is given by the position indicator in
the cassette escutcheon as it moves through the door cutout.
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Courtesy of NationalSwitchgear.com
Figure 8.1 Circuit breaker in CONNECTED position
Figure 8.2 Circuit breaker in TEST position
Figure 8.3 Circuit breaker in DISCONNECTED position
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