IB 6.2.11.1-1C
Page 17
ABB
escutcheon box (right-hand side when facing the front
of the circuit breaker) and depress the close block lever
pin (5) at "A".
3. With the close block lever pin (5) held in the down
position, lift the manual close lever. The close block
lever pin (5) will remain in the down position.
4. Insert the maintenance handle in the ratchet carrier
and operate the handle to slowly close the contacts
(See Figure 4).
To repeat the slow close operation, continue with the
following steps:
5. Insert the maintenance handle and continue the
charging operation until the indicator shows "SPRINGS
CHARGED".
6. Push the manual "TRIP" button to open the contacts.
7. Repeat Steps 2, 3, and 4 above for the slow close
operation.
To reset the charging cranks for normal electrical
operation, proceed as follows:
8. Perform Steps 5 and 6 above.
9. Lift manual close lever to close the contacts.
10. Push the manual "TRIP" button to open the
contacts.
The circuit breaker is now ready for normal service
operation with the charging cranks reset and the
closing springs discharged.
CONTACT PRESSURE
(Refer to Figure 8)
The main contact adjustment is to be made with the
breaker in the latched closed position. The self-locking
adjusting stud (1) is to be turned to provide contact
pressure such that a 0.750 inch shim will just fit the
space “A” at the rear of the moving main contacts (2).
On 800A models where this measurement is difficult to
obtain, a dimension of 1.625 across space “B” may be
used instead.
After making this adjustment in contact pressure, open
the circuit breaker, then reclose the circuit breaker
normally and recheck the gap. Readjust if necessary.
Open the circuit breaker and slow close the contacts
until the arcing contact (3) of one pole just touches.
The remaining poles should then be advanced by
turning adjusting stud (1) so that these poles just touch
Figure 5
- Partial View of Escutcheon Assembly
(Right-Hand Side) Showing Slow Close Lever for
Manually Operated Circuit Breakers
Figure 6
- Location of Hole in Spring Guard
Figure 7
- Partial View of Escutcheon Assembly
(Right-Hand Side) Showing Slow Close Lever for
Electrically Operated Circuit Breakers
