ABB REM543: Motor Protection and Control Relay

Typical Applications

The ABB REM543 is widely used in medium- and low-voltage motor systems where reliable protection, precise monitoring, and flexible control are required. It is especially suitable for critical motors operating in industrial plants, utilities, and infrastructure projects, where downtime and equipment damage must be minimized.

Common application scenarios include:

Large induction and synchronous motors

Pumps, fans, compressors, and conveyors

Mining and metal processing facilities

Power plants and auxiliary systems

Chemical, cement, and pulp & paper industries

Product Overview

The ABB REM543 is a multifunctional motor protection and control relay from ABB’s proven protection relay portfolio. It integrates protection, measurement, monitoring, and control functions into a single intelligent device. Designed for high dependability, the REM543 enhances motor safety while improving operational efficiency and system visibility.

Core Features

Comprehensive motor protection functions in one relay

Accurate current, voltage, and power measurement

Programmable logic for flexible motor control schemes

Event recording and fault diagnostics for fast troubleshooting

Communication support for integration into modern automation systems

Technical Parameters

The REM543 operates with auxiliary power supply options suitable for industrial control systems and supports standard CT and VT inputs. It provides protection against overload, short-circuit, earth fault, phase unbalance, phase loss, and locked rotor conditions. Measurement functions include phase currents, voltages, active and reactive power, and energy values. The relay supports digital inputs and outputs for control commands, interlocking, and alarms, allowing seamless integration into motor control centers (MCCs).

Protection & Control Functions

Thermal overload protection with motor thermal model

Short-circuit and instantaneous overcurrent protection

Earth fault protection

Phase reversal and phase unbalance detection

Start supervision and stall protection

Motor start and stop control with interlocking logic

Structure & Components

The ABB REM543 features a compact, panel-mounted housing with a clear front interface. The front panel includes status LEDs and a display for local indication of operating conditions and alarms. Internally, the relay combines high-precision measurement circuits with a powerful processing unit, ensuring fast response times and reliable protection decisions.

Installation & Maintenance

Installation: Designed for panel mounting in motor control cabinets. Proper CT and VT wiring is essential for accurate measurement and protection.

Commissioning: Settings can be configured via front-panel controls or through ABB-compatible configuration software.

Maintenance: Minimal routine maintenance is required. Periodic inspection of wiring connections and review of event logs is recommended to ensure long-term reliability.

Operational Advantages

Reduces motor downtime through fast fault detection

Consolidates multiple protection devices into one relay

Enhances motor lifespan with accurate thermal modeling

Improves system transparency with detailed diagnostics and records

Proven ABB quality for demanding industrial environments