5
1. Introduction to the Power Xpert® Release trip unit
PXR tRiP units foR PoweR Defense molDeD case ciRcuit bReakeRs
MN012007EN March 2019 www.eaton.com
1.3 Health monitor
The PXR 20, 20D, and 25 trip units utilize an innovative algorithm to determine a health
status. The health status is continuously updated as overloads and interruption events
occur. To view the factors that affect the health monitor, select the “Diagnostics” menu.
The summary screen shown below is 100% of life with all four bars shaded. Each bar is
approximately 25% of breaker health according to the algorithm. As the life is decreased, the
shading in the leading bars will disappear. In the PXR 20 the alarm will be generated at 25%
of health remaining. In the PXR 20D and PXR 25 the alarm can be adjusted from 0% - 50%
percent with a default of 25%.
See Chapter 8 Health monitor
1.4 Communication features
The PXR 20, 20D, and 25 trip units feature options for built-in communications. Standard
embedded serial communications (optional on the PXR 20) and optional Communications
Adapter Modules (CAM) allow for easy connections over the serial protocol Modbus-RTU,
Ethernet protocols such and Modbus-TCP (CAM), or industrial protocols such as Profibus-DP
(CAM).
The communication features in conjunction with the metering, health, and control functions
can be utilized in IOT based systems, thus allowing for greater visibility in to the facility,
process, or machine, and adhering to the Design Principles of Industry 4.0.
1.5 Control features
The PXR trip units allow for full control of the breaker. This control is available using commu-
nications, discrete I/O or both. This allows the PXR to be easy integrated in to larger control
schemes.
Discrete I/O options for Undervoltage Release (UVRs), Shunt Trips, and relays that can be
configured for a wide range of functions such as trips and alarms, to monitoring of features
like Maintenance Mode or Breaker Health.
Communications capabilities allow options to control even more features, such as the ability
to open the breaker, control configurable relays, enable Maintenance Mode, reset trips,
health, counters, metering and other diagnostic data.
Summary
Breaker Health
Diagnostics
