ABB REF542plus Human-Machine Display Panel 2RCA029395 A00

I. Basic Model Information
Brand: ABB (Swedish original)
Model Full Name: REF542plus MMI2 IEC (BASE)
Material Order Number: 2RCA029395 A000 (Usually 2RCA029395A0003 is the complete version)
Product Type: REF542plus series front-mounted human-machine operation display unit (HMI panel), requires a rear-end protection host module for use, cannot operate independently
Product Status: The original factory has discontinued production. Market circulation is new original equipment, disassembled spare parts. Regular warranty period is 12 months
Installation Method: Embedded installation on switch cabinet panel

Core Functions
Local Human-Machine Operation: Local tripping, closing, reset, protection setting value viewing and modification, fault information retrieval
Local Display of Operating Data: Primary circuit current, voltage, power, frequency, energy, switch position status
Fault Alarm Indication: Device fault, protection trip, remote signal change LED indicator lights alarm
Single-line Diagram Visualization, Protection Event Recording, Fault Waveform Local Inquiry

Hardware Key Parameters
Screen Specifications: 192×64 dot matrix liquid crystal display, with backlight, supports Chinese and English switching
Operation Keys: Function navigation keys + dedicated keys for closing / opening / reset + local remote switch knob
Power Supply Range: DC 48～240V direct current operation power supply (supplied by the protection device itself)
Working Environment: -20℃～+60℃, protection grade IP54 (panel side), complies with IEC60255 relay protection standards
Communication Interface: Back-end plug-in bus on the panel, high-speed communication with REF542plus host body, does not directly use 485 / Ethernet

Companion Host and Protection Functions (Whole REF542plus System Capacity)
This panel is paired with REF542plus feeder protection measurement and control device. Standard protection functions include:
Three-stage interphase overcurrent (time-limited / reverse-time limited), direction overcurrent protection
Two-stage grounding fault protection, sensitive zero-sequence grounding protection
Overvoltage, undervoltage, overfrequency, low frequency, reverse power, thermal overload protection
Automatic reclosing, circuit breaker failure protection, arc light protection (optional)
Support fault recording, SOE event sequence recording, closing and opening circuit monitoring
I/O Configuration (Whole System)
Switching quantity input: 16 programmable DI
Relay output: 8 programmable DO (trip, alarm, position signal)
CT rated input: 1A / 5A selectable; PT voltage input: 100V
Communication Protocol
Standard: RS485 Modbus RTU, IEC 60870-5-103
Optional Ethernet: IEC 61850 (GOOSE + MMS)