44
User Manual
MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON
www.eaton.com
29CFR1910 subpart 5 .
General cleaning recommendations
Circuit breaker cleaning activities should be part of an overall activity
that includes the assembly in which the circuit breaker is installed .
Loose dust and dirt can be removed from external surfaces using
an industrial quality vacuum cleaner and/or lint-free cloth . Unless
otherwise indicated, never use high-pressure air because dirt or
foreign products can be driven into areas such as the breaker
mechanism, where additional friction sources could create problems .
Never use a wire brush to clean any part of the circuit breaker .
Functional tests
Eaton recommends that the following functional tests be performed
on Magnum PXR and PD-SB circuit breakers as part of any
maintenance procedure . These tests are meant to check the basic
functionality of the breaker components . The circuit breaker should
be removed from service and Eaton should be notified if the circuit
breaker fails to perform any of these tests successfully . Please
be prepared to provide the estimated number of operations the
circuit breaker has to date, (or exact number, if equipped with an
operations counter) as well as the following nameplate information if
possible .
Magnum nameplate information
a
Low voltage power circuit breaker family name
b
Breaker family designation number
c
Breaker frame size in amperes
d
Interrupting capacity rating
e
Factory equipped accessories
a
b
c
d
e
Before doing any work on drawout type circuit breakers, confirm that
the breaker is levered out to the TEST or DISCONNECT position . To
test the electrical operations of the circuit breaker accessories, the
breaker must be levered out to the TEST position . For breaker control
wiring information, refer to
. During the
levering process, be aware of any signs that would indicate that
the levering process is not working properly .
If working on a fixed circuit breaker, bus systems must be in an
electrically safe working condition for convenience and safety . The
circuit breaker should be switched to the OPEN state and the
mechanism springs discharged .
For functional testing of the trip unit, refer to the separate detailed
instruction book dedicated to the trip unit .
Manual operation functional test
Procedure
1.
Charge the breaker mechanism springs either using the charging
handle or the motor operator .
2.
Press the CLOSE pushbutton to close the breaker manually and
verify closing by noting the state of the indicating flag
(
) .
3.
Charge the breaker mechanism springs either using the charging
handle or the motor operator . If using the motor operator,
disconnect power to it to prevent automatic recharging .
4.
Press the OPEN pushbutton to manually open the breaker .
5.
Press the CLOSE pushbutton to manually close the breaker .
Is the breaker closed?
6.
Press the OPEN pushbutton to manually open the breaker .
Is the breaker open?
ote:
N
Repeat this entire described test procedure three times .
Figure 72. CLOSED and OPEN indicators
