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5 External wiring of the trip unit
PXR TRIP UNITS FOR POWER DEFENSE MOLDED CASE CIRCUIT BREAKERS MN012007EN June 2018 www.eaton.com
The following networks are supported:
Network Module name Instruction leaflet Wiring harness
ETHERNET (Modbus TCP) PXR-ECAM – MTCP IL0131132EN Field wired
PROFIBUS PXR-PCAM IL120009EN Field wired
Legacy CAM modules
Modbus-RTU MCAM IL0131091EN IL019001EN
INCOM ICAM IL01301033E IL019001EN
Please consult the respective instruction leaflet for details.
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.
Alarm relay(s)
ALM1 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
ALM2 Black / red
ALM3 Black / violet
ALMC Black
Modbus
MODBA 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).
MODBB Green / red
MODBG 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).
ARMSC Brown / white
Communication
adapter (CAM) link
CMM1 (TX+) Violet / white
Connection to the selected CAM module. Refer to
CAM ILs for wiring details.
CMM2 (TX-) Violet / red
CMM3 (GND) Violet / green
CMM4 (RX+) Violet / yellow
CMMG (RX-) Violet
5.2 Auxiliary power
Providing auxiliary power to the PXR trip unit will provide full functionality 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.
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