ABB 2RAA005844A0006A COM0003 | ABB IED Rear Communication Module

Description

Key Technical Specifications

Product Introduction

ABB COM0003 2RAA005844A0006A Product Introduction

ABB COM0003 2RAA005844A0006A is a rear communication interface module designed for ABB protection relays and intelligent electronic devices. It adds RS-485 serial communication capability and provides an IRIG-B input for precise time synchronization in substation automation environments.

The main purpose of ABB COM0003 2RAA005844A0006A is supporting existing ABB relay installations where communication compatibility and event timestamp accuracy are important. It is commonly used in systems requiring serial SCADA connections, relay-to-control-center communication, and synchronized disturbance records. Verify the exact relay model and communication option code before replacement.

COM0003 2RAA005844A0006A

Application Scenarios & Field Pitfalls (The Engineer’s Perspective)

Engineering Pain Point

A feeder relay continues protecting equipment locally, but the control room suddenly loses alarms, measurements, and event records. The protection function may still be active, yet the communication layer has failed.

This is a common issue in older substations. Communication modules are often replaced during maintenance because the relay itself is still serviceable. The challenge is restoring the correct serial parameters and time synchronization settings.

Typical Applications

• Electrical Substations – RS-485 communication between ABB protection relays and SCADA systems.
• Power Distribution Networks – Feeder protection relay communication and remote monitoring.
• Industrial Power Systems – Motor feeders, transformer protection, and plant electrical automation.
• Renewable Energy Plants – Relay data acquisition, event recording, and synchronized protection information.

Technical Pitfalls to Avoid

1. Verify Relay Compatibility Before Installation
   COM0003 is an option module, not a standalone communication converter. Confirm the host relay model, hardware revision, and supported communication options before replacement.
2. Check RS-485 Wiring Configuration
   Incorrect polarity, termination resistance, or 2-wire/4-wire configuration can prevent communication even when the module is functioning correctly.
3. Confirm IRIG-B Synchronization Settings
   Time synchronization requires correct relay configuration and compatible IRIG-B source signals. Incorrect time settings can affect disturbance records and event analysis.

Related Products

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• ABB COM0002 2RAA005844A0005A
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• ABB COM0031
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• ABB REF615
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• ABB RET615
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• ABB REM615
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• ABB REC615
  Bay control and protection relay used in distribution automation systems with configurable communication interfaces.
• ABB REF620
  Advanced feeder protection relay platform used for medium-voltage distribution applications requiring expanded protection functions.