Eaton Cutler-Hammer DSII Series - Section 5: Inspection and Maintenance; 5-1 General; 5-2 General Cleaning Recommendations; 5-3 When to Inspect

I. B. 694C694-02
will rotate so as to block the shutter interlock pin. This
prevents the shutter from returning to its closed position
and releasing the trip plate, if the levering crank is
removed. Thus, if a closing operation is attempted dur-
ing this part of the travel, a trip-free operation occurs
and the breaker contacts do not close. Note that this is
true for either direction of breaker travel so that no load
is made or broken at the disconnecting contacts.
When the breaker gets to the TEST position, a slot in
the interlock cam allows free movement of the shutter
CD
a. Connect Position
Page 37
interlock pin, and the shutter returns to its closed posi-
tion when the levering crank is removed. The levering
device arms are now almost vertically downward.
Figure
4-12c shows the DISCONNECT position. Here
the cam also rotates so as to block the shutter interlock
pin while the breaker is between positions, thus holding
the shutter open. When the exact position, as shown on
the indicator, is reached, the shutter will close when the
levering crank is removed. The levering arms will be
approximately 40 degrees below the horizontal.
c. Disconnect Position
b. Test Position
I I I
\ ,._____//
CD Levering Device Arms
®Shutter
d. Remove Position
@ Shutter Interlock Pin
0 Interlock Cam
Figure 4-12 Shutter, Interlock Cam and Levering Device Arms Relationship
Effective 07 /97
Courtesy of NationalSwitchgear.com