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User Manual MN013016EN
Effective July 2022
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
28
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Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
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
Operational
voltage
Running
Control
range
current
voltages
85–110%
(A. avg.)
a
24 Vdc
20–26
12
48 Vdc
41–53
5
60 Vdc
51–66
3
110–125 Vdc
94–138
2
220–250 Vdc
187–275
1
110–127 Vac
94–140
2
208–277 Vac
177–305
1
24 Vdc
20–26
12
48 Vdc
41–53
5
110–125 Vac/Vdc 94–138
2
220–250 Vav/Vdc 187–275
1
AC voltages are 50/60 Hz
a
5 second motors are considered compact size and 3 second motors are considered standard size.
b
Figure 42. Motor operator kit
Maximum
Typical
Power
charging
inrush
consumption
time
current
(W or VA)
(seconds)
300% of
300
5
running
500% of
250
5
running
600% of
250
5
running
600% of
250
5
running
600% of
250
5
running
600% of
250
5
running
600% of
250
5
running
300% of
300
3
running
500% of
250
3
running
600% of
250
3
running
600% of
250
3
running
b
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