operated breakers automatically runs and charges the clos-
ing springs.
4. The breaker can be closed manually or electrically after
the springs are charged.
5. The breaker can be opened (tripped) manually or electri-
cally through a shunt trip device.
6. The trip flap on the breaker compartment door will not trip
the breaker.
7. The breaker must be opened before further levering can
be done.
8. Overload tripping characteristics and other tripping system
functions can be visually checked and/or changed in this
position. All trip unit testing can be carried out in this posi-
tion.
4-5.4 CONNECT Position
In the CONNECT position, the breaker’s primary and second-
ary disconnecting contacts are both engaged with their
stationary counterparts in the breaker compartment.
This is the farthest position from the front of the compart-
ment into which the breaker can be levered. The CONNECT
position is indicated by:
1. The drawout position indicator on the front of the breaker
2. A sudden mechanical stop is felt in the form of an in-
crease in load on the levering crank handle
NOTICE
WHEN LEVERING IN FROM THE TEST POSITION, AN INCREASE
IN LOAD ON THE CRANk HANDLE IS FELT AS THE MAIN DISCON-
NECTING CONTACTS ARE ENGAGED. AS CRANkING IS CONTIN-
UED, THE LOAD WILL DECREASE SOME AND THEN SUDDENLY IN-
CREASE, AS THE FINAL CONNECTED POSITION STOP IS REACHED.
In this position, all the conditions listed for the TEST position
exist, except:
1. IN THIS POSITION, DO NOT ATTEMPT TO ELECTRICALLY
CHECK THE ELECTRONIC TRIP DEVICE WITH A TEST KIT
OR ANY OTHER METHOD, SINCE THE BREAKER WILL
BE TRIPPED AND CAUSE A DISRUPTION OF SERVICE.
2. The trip flap on the breaker compartment door is opera-
tive, and can be used to trip the breaker with the door
closed.
4-5.5 Mechanical Interlocking System Operation
Figure 4-11 shows that part of the interlock system which
prevents closing of the breaker while being driven in either
direction by the levering device, or while it is standing in
any intermediate position between TEST and CONNECT or
DISCONNECT. Figure 4-11a shows the shutter and trip plate
for normal operation, such as in the DISCONNECT, TEST, or
CONNECT positions. The breaker can be closed and tripped
open by all available devices in the latter two positions, ex-
cept for the trip flap on the breaker compartment door.
In Figure 4-11a, the shutter prevents pushing the levering de-
vice crank handle onto the worm shaft. If the shutter alone
is pushed downward, it will rotate slightly about its pivot pin
and its lower projection strikes the hook on the trip plate,
and the worm shaft will not be cleared. Therefore, it is nec-
essary to push the trip plate in, which moves the hook back
out of the way of the shutter lower projection. This permits
the shutter to be pushed downward to clear the worm shaft
for the levering device crank (Figure 4-11b).
It should be noted that pushing the trip plate in also pushes
the trip shaft pin so as to rotate the trip shaft counterclock-
wise, thus tripping the breaker open. If closing is attempted
with the linkage in a position as shown in Figure 4-11b, a
trip-free operation will occur.
Movement of the shutter is also controlled by the interlock
cam which is mounted on the levering device shaft to the
left of the worm gear. The interlock cam has a fixed relation-
ship to the levering device arms. Figure 4-12 shows the
relationship between the shutter, interlock cam and levering
device arms for the four basic positions of the drawout unit
in the compartment.
Figure 4-12a shows the CONNECT position. The cam is in
a position to allow free travel of the shutter interlock pin.
Therefore, the shutter can be pushed downward, but only
after pushing in the trip plate (Figure 4-11). This trips the
breaker and prevents levering out with the breaker closed.
Figure 4-12b shows the TEST position. Note that between
the CONNECT and TEST positions the cam
Effective July 2010
Instructional Book
IB694C694-03
42
eaton corporation
www.eaton.com
