Table 4. Magnum Pxr And Pd-Sb Trip Units; Figure 31. Pxr 25 Programmable Trip Unit Installed In Magnum Pxr Circuit Breaker - Eaton Magnum PXR User Manual

User Manual MN013016EN
Effective July 2022

Table 4. Magnum PXR and PD-SB trip units

Trip unit
Trip unit catalog number
PXR 20 PXR20VN30LNNC
PXR20VN30LGNC
PXR20VN30LNAM
PXR20VN30LGAM
PXR 25 PXR25VN30LNAM
PXR25VN30LGAM
Notes
LSI = Long, short and instantaneous protection are available
LSIG = Long, short, instantaneous, and ground protection are available
CAM = Communication adapter module, see Section 4.4 Communications adapter modules (CAMs).
The Trip Unit contains the electronics which support the protection
functions, metering capability, user interface and communication
features . It can be replaced in the field for the same style unit or
to a different style . Note that upgrading may require the installation
of other sub-system components and wiring to enable full feature
support .
The Frame Module is mounted permanently to the circuit breaker
frame, it should not be removed or replaced . It holds factory
configured frame information regarding the circuit breaker rating,
sensor calibration, and operation . The interface circuit for the sensors
as well as the configurable relays are mounted in the frame module .
The Voltage Module converts the line voltage from the top or
bottom breaker terminals for sensing by the trip unit electronics . It is
included on PXR 25 trip unit styles .
The electronic trip units are self-powered . When the circuit breaker
is closed, no external power is required to operate their current
protection systems . Current signal levels and the control power are
derived from the current sensors integrally mounted in the circuit
breaker .
The test functions are integrated into the trip unit and do not require
a separate test kit . Secondary injection is accomplished using an
on-board circuit to provide the input to the trip unit . Tests are initiated
using the trip unit's front panel and by using the configuration
software, Power Xpert Protection Manager (PXPM) .
Four built-in test modes are available for use: functional test using
secondary injection, functional test using simulated current, current
sensor continuity test, and open breaker functional test . Complete
testing of the trip unit system can be accomplished when a current
sensor test is used in conjunction with secondary injection test .
When the circuit breaker is shipped from the factory, the trip
unit's protective functions are normally set at minimum values .
For specific overload tripping characteristics and time/current
curves to coordinate with a load or system, refer to the trip unit
instruction book .
24
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Breaker catalog
digit 13,14 Protection
2A LSI
2C LSIG
2H LSI
2F LSIG
2Q LSI
2S LSIG
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
ARMS Communication
N Adapter module (CAM)
N Adapter module (CAM)
Y Modbus RTU & CAM
Y Modbus RTU & CAM
Y Modbus RTU & CAM
Y Modbus RTU & CAM
Figure 31. PXR 25 programmable trip unit installed in Magnum
PXR circuit breaker
Metering
Current
Current
Current
Current
Current, voltage, power, energy
Current, voltage, power, energy