15
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
Note: On breakers equipped for power operation,
when they are in the compartment and in either the
TEST or CONNECT position, the spring-charge motor
normally runs automatically and charges the closing
springs as soon as the breaker opens. The closing
springs normally remain discharged while the
breaker stands in the closed position. Also see Sec-
tion 5.1.2.1.
Now to become better acquainted with the breaker,
charge the closing springs, close and open the breaker
several times. Also, place the levering crank handle on
the levering device work shaft and rotate the levering
arms to their various positions by turning the levering
crank handle.
Leave the levering arms horizontal, with
rollers toward rear of breaker, i.e. in the remove posi-
tion.
The breaker is now ready to be put into its various operat-
ing positions in the compartment.
4.5 PLACE THE BREAKER IN THE TEST POSITION
Push the breaker into the REMOVE position.
YOU WILL NOTE THAT, WITH THE COMPARTMENT
DOOR OPEN, THE FRONT PANEL ASSEMBLY OF
THE BREAKER FORMS A STEEL PROTECTIVE
SHIELD.
Place crank on the levering device worm shaft. Turn
crank clockwise until drawout unit position indicator
shows “TEST.” Remove the levering device crank. The
shutter will close over the hex shaft. All manual opera-
tions can now be performed. On power operated break-
ers the spring is charged automatically as the breaker
arrives in the TEST position. The breaker can also be
opened with the shunt trip device, and it can be electri-
cally closed with the spring release device.
4.6 PLACE THE BREAKER IN THE CONNECT
POSITION
Press the trip plate and lower the shutter. Place the crank
handle on the levering device worm shaft and turn the
crank clockwise until the CONNECT position stop is
reached, as indicated by sudden increase in load on the
crank, as previously described in paragraph 4.1.
Note however, that before the stop is reached, an
increase in load on the crank will be felt after the breaker
has moved about an inch. This is caused by the making
up on the main disconnecting contacts. The load on the
crank will decrease after reaching a peak. The next
increase in load is when the stop is reached.
Note: Do not try to crank after the stop is reached.
Further tightening of the crank does not help keep
the breaker in position. When the crank handle is
removed, the shutter and the trip plate should snap
into normal position.
4.7 REMOVE THE BREAKER FOR FINAL
INSPECTION
Withdraw the breaker from the CONNECT position in the
compartment to the end of the extended rails following
the reverse procedure described above. Inspect it thor-
oughly to see that no foreign objects have lodged within
it. If any defects were found during these preliminary
operations, complete their corrections at once.
4.8 FINAL INSPECTION
MAKE SURE THE THREE (3) ARC CHUTES ARE
PROPERLY INSTALLED. MAKE SURE ALL FOUR (4)
INSULATING BARRIERS ARE PROPERLY INSTALLED.
1. With the breaker withdrawn, rotate levering device to
connected position before attempting to charge the
spring.
2. Close and trip the breaker several times as previ-
ously described.
3. Return the levering device to the remove position;
i.e., with the roller arms pointing toward the rear as
shown in Figure 6.
4. This completes the “dry run.”
4.9 AMPTECTOR TRIP SETTINGS
When the breaker is shipped, the calibrating dials of the
Amptector trip unit are at the nominal settings. For spe-
cific overload tripping characteristics to coordinate with
the load or the system, refer to Section 8 and Curves
found later in this instruction book.
4.10 PLACE THE BREAKER IN SERVICE
Lever the breaker into the connected position as previ-
ously described, and latch the compartment door.
