Product Description

Overview

The RER103 is a dedicated bus connection module from ABB, designed to provide seamless communication between RE_500 series protection and control relays and fiber-optic networks. It converts RS-485 electrical signals from relays into optical signals compatible with SPA-bus, LON®, or IEC 60870-5-103 networks, ensuring long-distance, interference-free communication in substations.

Key Features

Protocol Compatibility and Signal Conversion

• Supports multiple communication protocols: SPA-bus, LON®, and IEC 60870-5-103.

• Bi-directional signal conversion allows relay RS-485 communication to interface with optical fiber networks and vice versa.

Fiber-Optic Connectivity

• Provides total immunity to electromagnetic interference (EMI), critical in high-voltage substation environments.

• Ensures galvanic isolation between relays and communication networks, protecting equipment from ground loops and electrical surges.

Design and Installation

• Compact plug-in module attaches directly to the 9-pin D-type connector on the rear of RE_500 devices.

• Powered through the D-type connector, eliminating the need for additional power supplies.

• Includes a Service Pin for easy LON® network configuration and node identification during setup.

Available Variants

• RER103-BB: Plastic fiber transmitter and receiver for short-range connections.

• RER103-MM: Glass fiber transmitter and receiver for long-distance networks.

• RER103-BM/MB: Mixed fiber configurations for specialized network designs.

Technical Specifications

Applications

The RER103 is ideal for substation automation systems requiring secure, long-distance communication between protection relays and network controllers. It is compatible with RE_500 relays such as REF 541, REM 543, and RET 541.

Frequently Asked Questions

What is the function of the RER103?
It serves as a communication bridge between RE_500 series relays and fiber-optic networks, converting RS-485 electrical signals to optical signals.

Which relays are compatible?
Any RE_500 series device equipped with a 9-pin D-type connector, including REF 541, REM 543, and RET 541.

Can it be used for long-distance communication?
Yes, glass fiber versions (RER103-MM) support transmission up to 1000 meters, while plastic fiber versions (RER103-BB) are suitable for shorter connections.

Is additional power required?
No, the module draws power directly from the host relay via the D-type connector.

What are the recommended alternatives?
For new installations, ABB suggests SPA-ZC modules or modern Ethernet-based gateways.