Eaton Magnum Power Defense SB, User Manual

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User Manual MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON www.eaton.com
Figure 40. Auxiliary switch (Form C)
Internal electrical accessories
Other electrical accessories are mounted inside the circuit
breaker . They can be factory or site installed . There are two
different internally mounted accessories:
•
Overcurrent trip switch (bell alarm)
•
Motor operator
Overcurrent trip switch (bell alarm) —An overcurrent trip switch
(bell alarm) is an optional device ( Figure 41 ) . It provides an electrical
indication when a circuit breaker trips as a result of the trip unit
reacting to an overcurrent condition . Opening as a result of a circuit
breaker’s manual open button, shunt trip, or undervoltage release
does not cause the overcurrent trip switch to operate .
The overcurrent trip switch has 2 Form C contacts (
Table 9
) . The
status of the contacts changes when the trip indicator pops out . This
permits the switch to be used as an alarm or in conjunction with a
spring release to block a subsequent remote electrical
closing signal .
Mechanical trip
indicator
Figure 41. Mechanical trip indicator with associated overcurrent
trip switch
Motor operator —A motor operator is an electric motor assembly
internally mounted in the circuit breaker (
Figure 42
and
Figure 43
) .
It charges the closing springs electrically for remote or local operation .
The motor operator can be factory or site installed ( Table 10 ) .
To convert a manually operated circuit breaker to an electrically
operated circuit breaker, a UL Listed motor operator kit is available .
Table 10. Motor operator
Control
voltages
a
Operational
voltage
range
85–110%
Running
current
(A. avg.)
Typical
inrush
current
Power
consumption
(W or VA)
Maximum
charging
time
(seconds)
b
24 Vdc 20–26 12 300% of
running
300 5
48 Vdc 41–53 5 500% of
running
250 5
60 Vdc 51–66 3 600% of
running
250 5
110–125 Vdc 94–138 2 600% of
running
250 5
220–250 Vdc 187–275 1 600% of
running
250 5
110–127 Vac 94–140 2 600% of
running
250 5
208–277 Vac 177–305 1 600% of
running
250 5
24 Vdc 20–26 12 300% of
running
300 3
48 Vdc 41–53 5 500% of
running
250 3
110–125 Vac/Vdc 94–138 2 600% of
running
250 3
220–250 Vav/Vdc 187–275 1 600% of
running
250 3
a
AC voltages are 50/60 Hz
b
5 second motors are considered compact size and 3 second motors are considered standard size.
Figure 42. Motor operator kit