Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | REM543CM216AAAA |
| Product Family | REM 54 |
| Machine Terminal | REM543 |
| Application | Motor / rotating-machine protection and control |
| Hardware Version | C_216AAAA |
| CT Input | 1/5 A |
| VT Input | 100 V |
| Digital Inputs | 15 |
| Digital Input Threshold | 80 VDC |
| CPU | Integrated processor module |
| Auxiliary Supply | PS1/240 V |
| AC Supply | 110/120/220/240 VAC |
| DC Supply | 110/125/220 VDC |
| RTD/Analog Module | Not included in 216AAAA configuration |
| HMI | Fixed graphical display |
| Mechanical Design | 1/2 enclosure |
| Communication | SPA bus; additional communication functions depend on configuration |
| Configuration Environment | REM 54 engineering/configuration system |
The 216AAAA suffix matters. ABB’s hardware table shows that other REM543 variants use different power-supply, digital-input, display, sensor-channel, or RTD/analog configurations. It should therefore not be treated as a generic REM543 identifier.
Product Introduction
The ABB REM543CM216AAAA is a REM543 machine terminal designed for protection, control, measurement, and supervision of rotating electrical machines. The REM543 platform combines protection functions with programmable logic, switching-device control, event recording, measurement, and communication functions, making it more than a conventional overcurrent relay.
For maintenance work, the complete order code is critical. ABB states that the REM54 order number identifies the machine-terminal type together with its hardware and software configuration. For REM543CM216AAAA, the documented hardware combination uses 1/5 A CT inputs, 100 V VT inputs, an 80 VDC digital-input threshold, PS1/240 V auxiliary power, and a fixed graphical display.
REM543CM216AAAA
Engineering Pain Point
The main replacement risk is assuming that any REM543 is electrically equivalent to REM543CM216AAAA. It is not. The family was offered with multiple hardware combinations, including different auxiliary supplies, digital-input thresholds, analog/RTD configurations, displays, and sensor interfaces. A replacement should therefore be matched by the complete order code and installed wiring, not just the family name.
Typical Applications
- Medium-voltage motor protection — protection and monitoring of industrial motors and associated switchgear.
- Rotating-machine protection — current, voltage, thermal, frequency, and machine-status supervision.
- Motor control and switching — circuit-breaker, disconnector, and control logic functions supported by the platform.
- Plant protection/SCADA integration — event, measurement, status, and communication data exchange through the available REM54 communication interfaces.
Technical Pitfalls to Avoid
- Verify the auxiliary supply before energizing.
The 216AAAA configuration uses the PS1/240 V supply family, supporting 110/120/220/240 VAC or 110/125/220 VDC according to ABB’s hardware documentation. Do not assume a 24/48/60 VDC version is interchangeable. - Check CT and VT ratings.
This hardware configuration is specified with 1/5 A CT inputs and 100 V VT inputs. CT secondary wiring and VT ratios must agree with the relay configuration and protection study. - Do not assume the RTD option is installed.
ABB’s ordering matrix shows the RTD/analog module in other configurations, while the 216AAAA configuration does not include that module. - Check digital-input voltage.
The documented 216-series configuration uses an 80 VDC digital-input threshold. This is a major compatibility point when replacing a unit from another hardware family. - Preserve the protection configuration.
Hardware replacement does not automatically reproduce the installed protection settings, logic, communication parameters, or event-recording configuration. Back up the existing application/settings before removing a functioning unit whenever the system permits. - Match the complete order code.
ABB explicitly states that the REM54 order number identifies the machine terminal’s hardware and software configuration. Treat REM543CM216AAAA as the procurement identifier rather than shortening it to “.”
Related Products
- — Motor/rotating-machine protection and control terminal platform; multiple hardware configurations exist.
- ABB REM545 — Related REM54 machine terminal for rotating-machine applications with a different hardware/application configuration.
- ABB REF543 — Related ABB feeder protection and control terminal from the same broader generation of programmable protection terminals.
- ABB RET543 — Related transformer protection and control terminal using the same general ABB programmable terminal concept.
- ABB REL543 — Related line protection and control terminal in the same product-generation family.
- ABB REC523 — Related control/automation terminal used for switching-device control and substation automation applications.
Procurement note: For REM543CM216AAAA, the critical verification points are full order code, CT 1/5 A inputs, 100 V VT inputs, PS1/240 V auxiliary supply, 80 VDC digital-input threshold, fixed HMI, and absence of the RTD/analog module. ABB’s original documentation should take precedence over generic listings when determining interchangeability.
