52
User Manual MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON www.eaton.com
Interlocks inspection
Table 22. Pre-inspection conditions
Device Position of poles Mechanism Device position in cassette
Fixed Open Closed Charged Discharged — — — —
Drawout Open Closed Charged Discharged Connected Test Disconnected Removed
m WARNING
REMOVE THE DRAWOUT CIRCUIT BREAKERS FROM THE CASSETTE FOR
THE FOLLOWING TESTS. FOR FIXED MOUNTED CIRCUIT BREAKERS, ALL
PRIMARY AND SECONDARY POWER IS TO BE REMOVED.
Procedure
ote: N The circuit breaker will be required to be charged, closed, and opened
during this inspection procedure.
1. Remove the breaker front cover.
2. Verify that the breaker is in working order by charging the
breaker, close the breaker, recharge the breaker, and open
the breaker.
ote: N The breaker will need to be charged and opened for this inspection
procedure.
3. Verify that the circuit breaker will not close if any of the following
mechanical conditions exist:
a. If the breaker is equipped with an Undervoltage Release
that is NOT energized, and the breaker is charged and
opened, depress the CLOSE pushbutton. The breaker should
not close.
ote: N Remove the Undervoltage Release for the remainder of the interlock
testing if installed.
b. For drawout breakers, lift the levering-in screw access door.
With door open or not fully closed depress the CLOSE
button. The breaker should not close.
c. Rotate the levering-in screw and verify that the door does not
close in intermediate positions. The door should only close in
the full disconnect, test, and connect positions.
d. Return the drawout levering in screw to the disconnected
position.
e. Depress and hold the breakers OPEN pushbutton and then
depress the CLOSE pushbutton. The breaker should not
close.
4. If the breaker is equipped with an internal key lock, engage
the lock and remove the key. Depress the CLOSE button. The
breaker should not close. Reinsert the key and disengage the key
lock. Close the breaker. Attempt to engage the key lock; the key
should rotate 90 degrees and the breaker should open. Remove
the key and ensure the breaker is open, but do not recharge.
5. Depress and hold the CLOSE pushbutton while charging the
breaker. The breaker should not close when the breaker is fully
charged. Release and re-press the CLOSE button. The breaker
should close. Do not open the breaker until instructed to do so.
Figure 89. Charged and opened
Figure 90. Push to close
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