ABB RLM01 Auxiliary Relay Module for Substation Automation

Description

RLM01

The ABB RLM01 is a compact auxiliary relay module designed as a complementary component to ABB’s Relion® protection relays, providing enhanced control, interlocking, and interface capabilities for substation automation systems. As a key element in modern control architectures, it extends the functionality of primary protection devices by handling auxiliary control tasks, implementing custom logic sequences, and facilitating communication between different system components—eliminating the need for complex hardwired control circuits in substation and industrial control cabinets.

RLM01

This module integrates seamlessly with ABB’s Relion® product family, including relays like the ABB REU615 HBUAEAADANB6ANN1XG, as well as third-party protection and control devices. Its flexible design supports both traditional hardwired connections and digital communication interfaces, making it suitable for retrofitting in existing installations or integration into new digital substation projects. What makes the ABB RLM01 particularly valuable is its ability to simplify system design by centralizing auxiliary control functions, reducing wiring complexity, and enabling easier configuration changes through software tools rather than hardware modifications.

RLM01

Main features and advantages:

The ABB RLM01 delivers reliable auxiliary control performance through a robust design that supports up to 16 configurable digital inputs and 16 output relays, providing flexible connectivity for diverse control and interlocking applications. It features programmable logic capabilities that allow engineers to implement custom control sequences, interlocks, and timer functions, tailoring the module’s operation to specific application requirements without extensive hardwiring.

Hardware design highlights include a rugged, compact enclosure that operates reliably in temperatures ranging from -25 °C to +70° C, making it suitable for harsh industrial and substation environments. The module offers flexible mounting options and a modular design that allows for easy expansion when additional I/O points are required. Its low power consumption and efficient heat dissipation enable  Intensive installation alongside other protection and control devices in control cabinets without the need for additional cooling. LED indicators provide clear visual status of input and output signals, simplifying troubleshooting and system monitoring.

Application areas:

In modern substation automation systems, industrial control networks, and power distribution infrastructure, reliable auxiliary control and interlocking functions are essential to ensure safe and coordinated operation of protection relays, circuit breakers, and other critical equipment. These environments require compact, flexible modules that can handle auxiliary control tasks, interface between different system components, and provide secure interlocking to prevent unsafe operating conditions. Whether enabling communication between protection relays in a secondary substation, implementing logic interlocks in industrial control panels, or facilitating remote control operations in distribution networks, engineers need auxiliary modules that integrate seamlessly with existing systems while enhancing operational safety.

This is where the ABB RLM01 excels, serving as a versatile auxiliary relay module for automation and control applications across power systems and industrial facilities. In utility substations, it provides essential interlocking functions between primary protection relays and circuit breakers, preventing unauthorized or unsafe operations. In industrial plants, it acts as an interface between protection devices and SCADA systems, enabling remote control of critical circuits while maintaining local safety interlocks. Used in power system automation for years, the ABB RLM01 has proven its reliability in applications requiring precise auxiliary control, flexible configuration, and seamless integration with ABB’s Relion® protection relays, making it a trusted choice for utilities, industrial operators, and system integrators worldwide.

Related products:

ABB REU615 HBUAEAADANB6ANN1XG – Protection relay commonly paired with the ABB RLM01 to enhance auxiliary control capabilities in secondary substations.

ABB RET650 – Line protection relay that integrates with the ABB RLM01 for advanced interlocking in transmission networks.

ABB REF615 – Feeder protection relay that uses the ABB RLM01 to implement additional control logic in distribution systems.

ABB REX640 – Auxiliary control relay that works with the ABB RLM01 to expand I/O capabilities in complex control schemes.

ABB HMI60.1 – Local operator panel that connects to the ABB RLM01 for manual control and status monitoring.

ABB PSE600 – Redundant power supply unit providing stable voltage to the ABB RLM01 and associated devices.

ABB SPACOM S200 – Communication gateway enabling the ABB RLM01 to interface with SCADA systems using non-Modbus protocols.

ABB CMU800 – Circuit breaker monitoring unit that sends status signals to the ABB RLM01 for interlocking purposes.

Installation and maintenance:

Before installing the ABB RLM01, ensure the mounting rail is securely fastened in the control cabinet with at least 50mm clearance above and below the module to facilitate wiring and heat dissipation. Verify that the power supply voltage matches the module’s rated input specifications and that appropriate overcurrent protection is provided in the auxiliary power circuit. When connecting to protection relays like the ABB REU615 HBUAEAADANB6ANN1XG, confirm that communication protocols and baud rates are properly configured for seamless data exchange.

For maintenance, perform quarterly visual inspections to check for loose connections, dust accumulation, and damage to terminal blocks. Use ABB’s configuration software semi-annually to verify logic settings, review event logs, and confirm communication integrity with connected devices. Schedule firmware updates during planned maintenance windows, ensuring configuration backups are stored securely beforehand. The ABB RLM01 includes self-diagnostic features that monitor internal functions and relay status, providing alarm outputs for any detected anomalies to facilitate proactive maintenance.

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