26
User Manual MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON www.eaton.com
Accessory devices
A variety of accessory devices are available for use with Magnum
PXR or PD-SB circuit breakers. Unless otherwise stated, they are all
considered optional devices in the sense that they are not provided
as standard on a manually operated circuit breaker. Available
accessories are identified here and discussed in general terms. For
more detailed information and/or installation instructions, refer to
individual instructional leaflets dedicated to the accessories.
Magnum PXR and PD-SB circuit breaker accessories are designed to
fit all frame sizes. The accessories fall into one of three categories:
•
Plug-in electrical
•
Internal electrical
•
Mechanical
Plug-in electrical accessories
There are four plug-in electrical accessories for use with Magnum
PXR and PD-SB circuit breakers. Three can be viewed for
identification by name and rating through viewing windows located
in the right front of the circuit breaker (Figure 34). All four are plug-in
type and can be factory installed or field installed using a UL Listed
kit.
The four plug-in accessories are:
•
Shunt trip (ST)
•
Spring release (SR)
•
Undervoltage release (UVR)
•
Auxiliary switch
Figure 34. Through-the-window electrical accessories
Shunt trip—The shunt trip is an optional device on circuit
breakers (Figure 35 and Figure 36). It opens the circuit breaker
instantaneously when its coil is energized by a voltage input
(Table 5). A total of two shunt trips can be mounted on a Magnum
PXR and PD-SB circuit breakers. Shunt trips are available with a
continuous duty coil or a cutoff switch. A continuous duty (or 100%
rated) shunt trip can be continuously energized and is useful in
applications where it is desired to keep the breaker tripped open.
Shunt trips that have a cutoff switch remove voltage from the coil
once the breaker contacts are opened.
Table 5. Shunt trip ratings
Control
voltages
Operational voltage
range 70–110%
Inrush power
consumption
a
Opening
time (ms)
24 Vdc 17–26 Vdc 250 W 35
48 Vdc 34–53 Vdc 250 W 35
60 Vdc 42–66 Vdc 300 W 35
110–125 Vdc 77–138 Vdc 450 W 35
220–250 Vdc 154–275 Vdc 450 W 35
110–127 Vac 77–140 Vac 450 VA 35
208–240 Vac 146–264 Vac 450 VA 35
a
Required for less than 35 ms.
Table 6. Continuous duty shunt trip
Control
voltages
Operational
voltage range
70–110%
Inrush/continuous
power consumption
Opening
time
24 Vdc 17–26 250 W / 18 W 35
48 Vdc 34–53 275 W / 18 W 35
60 Vdc 42–66 275 W / 18 W 35
110–125 Vdc 77–138 450 W /1 0 W 35
220–250 Vdc 154–275 450 W / 10 W 35
110–127 Vac 77–140 450 VA / 10 VA 35
208–240 Vac 146–264 400 VA / 10 VA 35
Figure 35. Shunt trip with cutoff switch
Figure 36. Shunt trip switch installed
Spring release—The spring release is an optional device (Figure 37).
It remotely closes the circuit breaker when the coil is energized by a
voltage input (Table 7). The closing spring must be fully charged and
the trip latch reset (not held in the tripped position) for the spring
release to operate. If these two conditions are not met, the close
signal will be ignored until it is removed and re-applied.
Table 7. Spring release ratings
Control
voltages
Operational voltage
range 85–110%
Inrush power
consumption
Closing
time (ms)
24 Vdc 20–26 Vdc 250 W 40
48 Vdc 41–53 Vdc 250 W 40
60 Vdc 51–66 Vdc 300 W 40
110–125 Vdc 93–138 Vdc 450 W 40
220–250 Vdc 187–275 Vdc 450 W 40
110–127 Vac 93–140 Vac 450 VA 40
208–240 Vac 177–264 Vac 450 VA 40
Accessory viewing windows
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