59
A K D - 20 A N D E NTE LLYS I S
LO W VO LTAG E S W I TC H G E A R
7.2 Circuit breaker draw-out operation
Breaker positions
Refer to Figs. 7.1, 7.2, and 7.3. The draw-out
operation features four positions:
1. Connected - In the CONNECTED position, the
primary and secondary disconnects are fully
engaged. The breaker must be tripped before
it can be racked out of this position.
2. Test - When in the TEST position, the primary
contacts are disconnected, but the secondary
contacts remain engaged. This allows complete
breaker operation without energizing the
primary circuit.
3. Disconnected - In the DISCONNECTED position,
neither primary nor secondary contacts are
made. Breakers may be racked between these
three positions with the compartment door
closed and latched.
4. Withdrawn - With the door open, the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DISCONNECTED to the WITHDRAWN position.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.
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.
—
Fig. 7.1
Breaker shown in
CONNECT position
—
Fig. 7.2
Breaker shown in
TEST position
—
Fig. 7.3
Breaker shown in
DISCONNECTED position
—
Fig. 7.1
—
Fig. 7.2
—
Fig. 7.3