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The ABB REM543 is a high-performance, microprocessor-based motor protection terminal designed for comprehensive protection of medium and large-sized induction and synchronous motors. As a core member of ABB's Relion® series, the REM543 provides integrated multifunction protection, advanced metering, fault recording, and communication capabilities for critical rotating machinery in industrial and power generation applications .

The ABB REM543 serves as the main protection system for generator and generator-transformer units in small and medium-power diesel, hydroelectric, and steam power plants. Additionally, the REM543 protects large MV synchronous and asynchronous motors used in pumps, mills, crushers, compressors, and fans during both start-up and normal operating conditions

The REM543 offers extensive protection capabilities specifically designed for rotating machines:

Thermal Overload Protection (49): Two time-constant thermal model for rotor and stator windings, mimicking motor thermal capacity using IEC 60255-8 standards with exponential cooldown and block start features

Differential Protection (87M): Flux balance differential protection for internal winding short circuits (available in specific configurations)

Motor Starting Supervision (51/66): Locked rotor protection with I²t algorithm, stall protection using speed switch input, and starts-per-hour limiting

Current Protection: Phase overcurrent (50/51), negative-sequence overcurrent (46), undercurrent/load loss (37), and ground fault protection (50N/50GS)

Voltage Protection: Undervoltage (27), overvoltage (59), residual overvoltage (59N), and phase-sequence voltage protection (47)

Frequency Protection: Under/over frequency (81U/81O) for generator applications

Synchronized Machine Protection: Loss of field (40) and out-of-step protection (78) for synchronous motors and generators

RTD-Based Protection: Bearing overtemperature (38) and stator overtemperature (49T) using optional RTD inputs

Configuration Steps

Software Setup: Install ABB CAP501 software tool (included on CD-ROM) or PCM600 for relay configuration and monitoring

Communication Configuration: Configure Modbus RTU/TCP protocol via rear RS232 port or optional IEC 61850 through SPA-ZC 400 adapter

Protection Settings: Access the hierarchical menu structure through the graphical LCD display to configure thermal overload curves, current thresholds, and time delays

RTD Configuration: Assign RTD inputs to stator windings, motor bearings, load bearings, or ambient temperature measurement based on catalog number configuration

Logic Programming: Utilize built-in PLC functions to create custom interlocks, alarm sequences, and automation logic

Daily Operation

Monitor the 19-row graphical LCD display showing real-time motor status, temperatures, and estimated restart times

Use front panel pushbuttons (Select, Close, Open) for local breaker control with select-before-operate sequence

Check thermal status indicators showing estimated time to trip and time to allow restarting

Pre-Installation Requirements

Mount the ABB REM543 in a clean, dry environment with ambient temperature between -20°C and +60°C

Ensure minimum clearances for ventilation: panel cutout dimensions 10.0 x 8.3 inches (254 x 210 mm)

Verify that CT and VT ratios match the REM543 configuration (1A/5A, 100V/120V)

Wiring Instructions

Current Transformers: Connect phase CTs and differential protection CTs to terminal block X1.1; supports both 1A and 5A secondaries

Voltage Transformers: Connect three-phase VT inputs (100-120V secondary) for voltage protection and measurement functions

RTD Connections: Use shielded cables for RTD inputs (Pt100) assigned to stator windings, bearings, or ambient temperature monitoring

Control Circuits: Connect trip and close circuits with supervision; the REM543 provides manual trip/close capability from the front panel

Communication: Connect optical RS232 front port for local PC communication and rear RS232 for Modbus SCADA integration

Pre-Energization Checks

Verify insulation resistance >100 MΩ at 500V DC per IEC 60255-5

Perform dielectric test at 2kV, 50Hz for 1 minute

Confirm CT/VT polarity and ratio settings match the REM543 configuration

Check all terminal connections for tightness (Phoenix type terminals)

Hardware Verification: Confirm REM543 catalog number matches application requirements (RTD configuration, control voltage)

Parameter Configuration: Load motor nameplate data (full load current, locked rotor current, starting time, cooling time constant) into thermal overload function

Protection Testing: Perform secondary injection testing for overcurrent, ground fault, and voltage protection elements

RTD Verification: Verify temperature readings from all connected RTDs (stator windings, bearings)

Communication Testing: Validate Modbus register mapping and SCADA integration

Functional Testing: Test trip and close operations, verify breaker failure protection (62BF) if enabled 

Routine Inspection (Quarterly)

Inspect the REM543 front panel for dust accumulation and clean display if necessary

Verify all LED indicators function correctly during self-test

Check communication cable connections and grounding integrity

Annual Maintenance

Perform secondary injection testing to verify protection settings and trip times

Test output contacts for proper operation (high-speed power outputs for tripping, signal outputs for alarms)

Review event records (stores 1000+ time-stamped events) and oscillography records (up to 50 cycles waveform capture)

Verify trip circuit supervision (TCS) and close circuit supervision functionality

Long-Term Maintenance

3-Year Cycle: Calibration verification of measurement circuits (accuracy ±0.5% for current/voltage, ±1.0% for power)

5-Year Cycle: Replacement of electrolytic capacitors if operating in harsh environments; battery replacement not required as settings are stored in non-volatile memory

Condition Monitoring

The ABB REM543 provides continuous self-diagnostics including:

Circuit breaker condition monitoring (contact wear, operation time counter)

CT/VT input circuit supervision

Trip circuit supervision (TCS) with trace current injection

Self-supervision alarm output (IRF code indication for fault identification)

Password Protection: The REM543 features two access levels—User Level for everyday monitoring and Technical Level (password-protected) for settings modification

Non-Volatile Memory: All settings retained without battery backup; event logs maintained during power outages

Marine Certification: The REM543 is certified for marine and offshore applications

Arc-Flash Safety: Remote monitoring capabilities reduce need for front panel access during operation

REM543CG212AAAA Standard configuration with 6 RTD inputs (stator windings) and 2 motor bearing RTDs

REM543CM216AAAA Configuration with 3 stator winding RTDs, 2 motor bearing RTDs, 2 load bearing RTDs, and 1 ambient RTD

REM545 Advanced version for large generators with additional differential and distance protection functions

REM615 Successor model to REM543 with enhanced IEC 61850 support and cybersecurity features

REF615 Feeder protection relay complementary to REM543 for complete substation protection

REU610 Voltage protection relay for busbar protection applications

Do you provide global shipping services?

Yes. We have local distribution centers on all continents, which can quickly transport parts to any corner of the world.

2. What payment methods and currencies do you accept?

To make your purchasing process as simple as possible, we offer multiple payment methods including bank transfer, check, and PayPal. Meanwhile, we also accept most mainstream credit and debit cards, such as Visa, Mastercard, and American Express. We can accept payments in most major currencies worldwide, but we recommend using US dollars (USD), British pounds (GBP), or euros (EUR) as a priority. Payments in other currencies may incur additional fees. All transactions are securely processed by HSBC Bank and HSBC Merchant Services.

How many parts do you currently have in stock?

We have a vast inventory of thousands of new, refurbished, and outdated automation components, including products from well-known manufacturers such as ABB and Schneider. If you cannot find the required parts, please do not worry. We work closely with a global network of professional suppliers to provide you with tailored quotes even if the part is not listed on our website.

Who can I contact if I encounter any problems?

Our experienced customer service team will handle any issues after you place your order.