31
Instruction Booklet IB 33-790-1J
Effective November 2010
Instructions for Low Voltage Power
Circuit Breakers Types DS and DSL
EATON CORPORATION www.eaton.com
2. In the DISCONNECT position it prevents the breaker
from being withdrawn from its compartment.
3. In the TEST position it permits all normal no-load
operations of the breaker with the primary disconnect
contacts separated.
4. In the CONNECT position it prevents the disconnect-
ing or withdrawal of a closed breaker. This prevents
the drawing of dangerous, destructive arcs on the
disconnecting contacts if the circuit is loaded.
5. While moving the breaker in either dir
ection between
the TEST position and the CONNECT position or the
DISCONNECT position; or while standing in any
intermediate position, it prevents the closing of the
breaker. Therefore it prevents the connecting of the
closed breaker to the power circuits. This prevents
arcing on the disconnecting contacts as would occur
in going into contact with a load on the circuit.
Here are the detailed interlocking conditions which exist
in each of the four breaker pos
itions:
5.1.7.1 The REMOVE Position
This is the position of the breaker when nearest the front
of its compartment, and is where the breaker must be
placed when it is installed after having been completely
outside of the compartment.
In this position, the following conditions exist.
A. The breaker is open.
B. The closing springs are discharged. If an attempt is
made to charge the springs, a trip-free operation
will result.
C. The breaker cannot be closed either elect
rically or
by hand.
D. The breaker c
an be withdrawn from the compart-
ment by direct pull. (The levering device is not
engaged with the cradle.)
E. The levering device arms are in a horizontal posi-
tion with their rollers pointing toward the rear (see
Figure 6).
5.1.7.2 The DISCONNECT Position
In this position the breaker has moved only a fraction of
an inch into its compartment and will be shown by the
position indicator.
In this position the following conditions exist.
A. The brea
ker will be held in its compartment as the
levering rollers have lowered into the slots in the
cradle arms.
B. The shutter will close over the levering device hex
shaft.
C. The shutter may be locked closed and the breaker
held trip-free by a padlock as described in Section
5.1.8.5, thus locking it in the compartment.
D. Both primary and secondary disconnecting con-
tacts are separated.
E. The breaker is open.
5.1.7.3 The TEST Position
This is the position of the breaker when at a point in
between the DISCONNECT position and the CONNECT
position, as shown by the draw-out position indicator. In
this position the main disconnecting contacts are sepa-
rated enough to permit safe operation of the breaker.
However, the secondary contacts are made up.
In this position the following conditions exist.
A. The breaker must arrive in this position-from either
direction with its contacts open. Its closing springs
ma
y be either charged or discharg
ed when coming
from the connected position.
B. When the levering crank handle is removed, it is
possible to close and trip the breaker by hand or
electrically.
C. Just before the breaker arrives in the TEST posi-
tion from the DISCONNECT position, the second-
ary contacts make up and the spring-charge motor
automatically runs and charges the closing springs
on power-operated breakers.
D. The breaker can be closed by hand, or electri
cally,
after the springs are c
harged as in paragraph C
above.
E. The breaker can be tripped open by hand, or elec-
trically through the shunt trip device.
F. The trip plate on the hinged compartment door will
not trip the breaker.
G. The breaker must be open before further levering
can be done.
H. The overload tripping characteristics can be visu-
ally checked or changed. Amptector trip devices
can be electrically checked and calibrated with a
portable test kit (access
ory equipment).
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