The ABB REM543 (specifically part number REM543BG217AAAA Rev:B) is a high-performance Machine Terminal Relay from the REX 500 series. Designed for the comprehensive protection, control, and monitoring of medium to large synchronous and asynchronous motors and generators, this terminal provides a unified platform for complex machine automation.
Technical Functionality
The REM543 combines protection, measurement, and control functions into a single unit, eliminating the need for separate auxiliary relays. It features advanced thermal overload protection, differential protection, and earth-fault detection. The “Rev:B” hardware enhancement ensures improved processing stability and refined analog signal filtering for precise fault evaluation.
Key Specifications
| Parameter | Specification |
| Model | REM543 |
| Ordering Code | REM543BG217AAAA |
| Hardware Revision | Rev:B |
| Application | Motor and Generator Protection |
| Inputs/Outputs | 15 Binary Inputs / 11 Binary Outputs |
| Display | Large LCD with Programmable Mimic |
Operational Precautions
- Current Matching: When configuring differential protection (87M), ensure the CT (Current Transformer) ratios at both the neutral and terminal ends are perfectly matched in the relay settings to avoid nuisance tripping.
- Thermal Image Reset: Be cautious when manually resetting the thermal image after a trip; restarting a machine before it has physically cooled can lead to permanent insulation damage.
- Rear Terminals: The Rev:B connectors are high-density; use the correct crimp tools and ensure no stray wire strands cause a short circuit between adjacent terminal blocks.
Common Questions Q&A
Q: Can the REM543 handle RTD temperature inputs? A: Yes, when equipped with the appropriate analog input module, the REM543 can directly monitor stator and bearing temperatures for comprehensive thermal protection.
Q: Does this relay support Modbus communication? A: Absolutely. The REM543 supports multiple protocols including Modbus RTU/TCP, SPA-bus, and IEC 60870-5-103 for integration into SCADA systems.
Recommended Similar Models
- REM545: An expanded version of the 543 series with additional I/O capacity.
- REM615: The modern Relion successor for compact motor protection.
- RET541: A transformer-specific protection terminal from the same REX 500 family.
- REF541: A dedicated feeder protection and control terminal.
- REU523: A simplified voltage and frequency protection relay often used in smaller plants.
Technical specifications and stock status for the ABB REM543BG217AAAA are updated regularly within our industrial protection inventory.
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