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5 External wiring of the trip unit
PXR tRiP units foR PoweR Defense molDeD case ciRcuit bReakeRs
MN012007EN March 2019 www.eaton.com
5 External wiring of the trip unit
The PXR family has a rich set of options for integrating the trip unit into a larger system.
Wires exit the breaker at the rear through a trough on both the left and right side. The
wiring functionality and color coding is identical throughout the family and frames.
5.1 Wiring table
Wire colors and function are consistent across all PXRs in the Power Defense family. The
styles and options ordered determine which of the following wires are provided.
feature
short name
color
notes
Aux Power
AUX +24V
Orange
24 VDC 0.5 A 20 VA is required. Eaton PSG family recommended.
AUX 0V
Orange / black
ZSI
ZIN
Yellow / black
These connect to other ZSI enabled breakers in the system. Maximum
length of 75 meters (250 feet) using AWG # 22 wire.
ZOUT
Yellow / red
ZCOM
Yellow
Neutral sensor
N1
Grey
Connect to the external neutral current sensor.
N2
White
Voltage sensor
NV
White/Grey
Connect to the neutral sensor module and then the neutral bus.
Configurable relays
(Second Wire
harness depeding on
Model)
RLY1
Black /white
Normally open contacts, close when the associated alarm is active.
Contacts rated to 240 VAC, 1 Amp. See Section 5.3: General purpose
relay mapping
RLY2
Black / red
RLY3
Black / Violet
RLYC
Black
Modbus
RTU_A (D-)
Green / black
Modbus RTU, max of 99 nodes, length 1,200 meters (4,000 ft.).
Recommended cable: twisted-pair foil shield w/ drain wire, 120 ohms
impedance. Rated for the use (typical 75C and 300 V NEC CM, or
Belden Data Tray series 3074F for 600 V NEC TC).
RTU_B (D+)
Green / red
RTU_GND
Green
Maintenance Mode
ARMSIN
Brown
External dry contact. This is a low-voltage signal, use a high quality
gold contact and keep wire length under 3 meters (15 feet).
AMSC
Brown / white
feature
short name
color
cam pin label
cam
pin
notes
Communication
adapter (CAM) link
CMMC (GND)
Violet
0V/C/AGND
2
Connection to the selected CAM module.
Refer to CAM ILs for wiring details.
CMM1 (TX+)
Violet / red
RX+/CMM1
3
CMM2 (TX-)
Violet / yellow
RX-/CMM2
4
CMM3 (RX+)
Violet / white
TX+/CMM3
5
CMM4 (RX-)
Violet / green
TX-/CMM4
6
5.2 Auxiliary power
Providing auxiliary power to the PXR trip unit will provide full functionality and communica-
tions even when the circuit breaker is open or when the circuit breaker is under very light
load such that the self-powering current transformer cannot provide sufficient energy to fully
power the trip unit.
The power requirements are: 24 VDC +/- 10%, 1.0 A. The Eaton PSG family of power
supplies with 24 V output are recommended. One supply can feed multiple PXR trip units if
desired.
REMEMBER
: Auxiliary power is not required to provide current protection features.
Protection is active well before any overload. The trip unit begins to power-up at very low
levels of current (approximately 20% of the frame rating). For single-phase applications, self-
power occurs at a higher current threshold (approximately 30% of the frame rating).
