30
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
5. Close Bar Guard
This covers the close bar to prevent unintentional manual
closing of the breaker. It is mounted on the front panel to
cover the close bar. In case of emergency, the breaker
may be closed by pushing the close bar through a small
hole in the cover (see Figure 26c).
6. Operation Counter
Mechanical counter mounted under the top plate below
the auxiliary switch provides the record of the number of
breaker operations. The counter is connected through
linkage to the pole shaft.
5.1.7 Mechanical Interlocking, Description and
Explanation of Operation
To increase safety to personnel and the circuits to which
the breaker is connected, the complete unit is equipped
with automatic mechanical interlocking. This interlocking
is effective in various ways in the four breaker positions
(Figure 27).
DO NOT TAMPER WITH INTERLOCKING, AND IF IS
NOT FUNCTIONING, HAVE IT CORRECTED. INTER-
LOCKING THAT IS FUNCTIONING IMPROPERLY CAN
RESULT IN MECHANICAL AND ELECTRICAL DAM-
AGE TO EQUIPMENT AND BODILY INJURY TO PER-
SONNEL.
a. The REMOVE position.
b. The DISCONNECT position.
c. The TEST position.
d. The CONNECT position.
In addition there is an interference interlock described in
Section 5.1.6.1.
This mechanical interlock system serves basic purposes
as follows.
1. In the REMOVE position it prevents the breaker from
being closed and prevents the closing springs from
being charged or remaining charged. The levering
device shutter is held open.
Fig. 27 Drawout Unit Position Indicator.
WARNING
