Abb REM601 Overload Relay

Overview & Key Features

The Abb REM601 is a dedicated motor protection and overload relay engineered for three-phase asynchronous motors in manufacturing and process industry applications. It consolidates thermal overload, short-circuit, start-up, negative-phase sequence, loss-of-phase, locked-rotor, sensitive earth-fault, loss-of-load, and circuit-breaker failure protection into a single compact unit, with preconfigured logic that minimizes setup time. Engineers can adjust parameters and binary I/O mapping through the local Human-Machine Interface (LHMI) without external tooling.

Key features at a glance:

• Comprehensive motor protection for medium-voltage and low-voltage three-phase asynchronous motors
• Dual current-sensor support: conventional current transformers or Rogowski coil analog interface
• Compatible with both circuit-breaker and contactor-controlled motor drives
• Preconfigured protection settings for fast switchgear commissioning
• Configurable binary inputs and outputs via LHMI or communication interface
• Site-selectable Modbus RTU and IEC 60870-5-103 communication protocols
• Extensive self-supervision of relay hardware and software
• Compact form factor that reduces medium-voltage switchgear footprint

Practical Applications and How It Works

The REM601 is typically deployed in motor starters, feeder bays, and process-line switchgear inside industrial plants such as pulp and paper mills, cement facilities, water-treatment works, mining operations, and chemical processing sites. It supervises the motor from start-up through steady-state running, intervening automatically when abnormal conditions are detected. When paired with Rogowski current sensors, the relay enables a compact medium-voltage switchgear design without sacrificing measurement accuracy, which is valuable for retrofits and space-constrained switchrooms.

How the REM601 works in practice:

• During start-up, the relay monitors locked-rotor, start-time, and current asymmetry conditions
• In steady-state operation, it tracks thermal loading using a true-RMS thermal model
• On detection of a fault, it trips the associated circuit breaker or contactor and logs the event
• Engineers can reconfigure I/O mapping directly from the LHMI without firmware changes
• Communication is selectable on site between Modbus RTU and IEC 60870-5-103 for SCADA integration

Frequently Asked Questions (FAQ)

Q: What motor types does the Abb REM601 protect? A: The REM601 protects three-phase asynchronous motors operating at medium-voltage and low-voltage levels, in both circuit-breaker-controlled and contactor-controlled drive configurations.

Q: Which current sensors are supported by the REM601? A: The relay accepts conventional current transformer inputs and also supports an analog interface for Rogowski current sensors, allowing compact switchgear designs.

Q: What communication protocols does it support? A: It supports site-selectable Modbus RTU and IEC 60870-5-103 protocols for integration with SCADA, DCS, and plant control systems.

Q: Can binary I/O be reconfigured in the field? A: Yes. Binary inputs and outputs are easily configurable through the local HMI or the communication interface, allowing site-specific tailoring without firmware changes.

About Spare Parts Map

Spare Parts Map is a global supplier of industrial spare parts, primarily serving customers across Europe. With over 20 years of experience, we respond to quotation requests quickly and ensure that every product reaches you without logistical complications. To receive pricing, lead time, and worldwide delivery options for the Abb REM601 Overload Relay, please submit a Request Quote through this page.