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 (
) . 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 (
) . It opens the circuit breaker
instantaneously when its coil is energized by a voltage input
(
) . 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
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 (
) .
It remotely closes the circuit breaker when the coil is energized by a
voltage input (
) . 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
