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
