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The GE POM11-T20-C-A is a compact, multifunction motor protection relay from General Electric’s (now part of Emerson) widely deployed POM11 series, engineered to provide comprehensive electrical and thermal protection for low- and medium-voltage induction motors up to several megawatts in industrial and utility applications. As a dedicated motor management device, the GE POM11-T20-C-A integrates essential protective functions—including phase overcurrent (50/51), thermal overload (49), undercurrent (37), phase imbalance, and earth fault detection—into a single DIN-rail-mounted unit with built-in metering and local human-machine interface (HMI). Its design emphasizes simplicity, reliability, and ease of integration, making it ideal for motor control centers (MCCs), pump stations, HVAC systems, and conveyor drives.
Positioned as a cost-effective yet highly capable solution for both new installations and legacy system retrofits, the GE POM11-T20-C-A supports universal power supply (24–240 V AC/DC) and accepts both 1 A and 5 A current transformer (CT) inputs without external shunts. It features Modbus RTU communication over RS-485 for SCADA integration and includes a backlit LCD for real-time current monitoring, trip diagnostics, and on-device setting adjustments. By combining accurate thermal modeling with fast short-circuit response, the GE POM11-T20-C-A prevents motor burnout due to mechanical overload, single-phasing, or insulation degradation—reducing unplanned downtime and extending asset life across demanding industrial environments.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | POM11-T20-C-A |
| Manufacturer | General Electric (GE) – now under Emerson Automation Solutions |
| Product Type | Multifunction Motor Protection Relay |
| Current Input | 3-phase, 1 A or 5 A (selectable via DIP switch) |
| Protection Functions | 50/51 (Overcurrent), 49 (Thermal Overload), 37 (Undercurrent), 46 (Phase Imbalance), 50G/51G (Earth Fault) |
| Communication Interface | RS-485 (Modbus RTU, 2-wire) |
| Power Supply | 24–240 V AC/DC (universal, isolated input) |
| Operating Temperature | -20°C to +60°C |
| Display | Backlit LCD with 3-line text, real-time RMS current, trip cause indication |
| Trip Output | 1 SPDT programmable relay (Form C contact, 5 A @ 250 V AC) |
| Mounting | 35 mm DIN rail (IEC 60715 compliant) |
| Standards Compliance | IEC 60255, UL 508, CSA C22.2 No. 14, CE |
| Dimensions (W × H × D) | 45 × 100 × 115 mm |
Main Features and Advantages
Accurate thermal overload protection with adaptive modeling:
The GE POM11-T20-C-A uses a dual thermal model that simulates both rotor and stator heating, accounting for startup inrush, cyclic loads, and cooling during rest periods. This prevents nuisance tripping while ensuring true motor protection—especially critical for high-inertia loads like crushers or compressors.
The GE POM11-T20-C-A uses a dual thermal model that simulates both rotor and stator heating, accounting for startup inrush, cyclic loads, and cooling during rest periods. This prevents nuisance tripping while ensuring true motor protection—especially critical for high-inertia loads like crushers or compressors.
Robust earth fault detection without external CT:
Unlike basic relays, the GE POM11-T20-C-A calculates residual current internally using the three-phase CTs (Kirkhoff’s law), enabling sensitive ground fault detection down to 10% of rated current—eliminating the need for a separate zero-sequence CT in many applications.
Unlike basic relays, the GE POM11-T20-C-A calculates residual current internally using the three-phase CTs (Kirkhoff’s law), enabling sensitive ground fault detection down to 10% of rated current—eliminating the need for a separate zero-sequence CT in many applications.
Local intelligence and diagnostics:
Equipped with a clear backlit LCD, the GE POM11-T20-C-A displays real-time RMS currents, percentage of thermal capacity used (%TCU), and the exact cause of the last trip (e.g., “Phase Imbalance” or “Earth Fault”). Technicians can adjust settings or initiate test modes directly at the device—no laptop required.
Equipped with a clear backlit LCD, the GE POM11-T20-C-A displays real-time RMS currents, percentage of thermal capacity used (%TCU), and the exact cause of the last trip (e.g., “Phase Imbalance” or “Earth Fault”). Technicians can adjust settings or initiate test modes directly at the device—no laptop required.
Universal compatibility and easy retrofit:
With its wide power supply range and support for both 1 A and 5 A CTs, the GE POM11-T20-C-A seamlessly replaces older electromechanical or solid-state overload relays in existing MCC buckets. Its compact 45 mm width fits standard panel layouts without modification.
With its wide power supply range and support for both 1 A and 5 A CTs, the GE POM11-T20-C-A seamlessly replaces older electromechanical or solid-state overload relays in existing MCC buckets. Its compact 45 mm width fits standard panel layouts without modification.
Reliable communication for predictive maintenance:
The integrated Modbus RTU interface allows continuous monitoring of motor health parameters—such as current imbalance, thermal utilization, and start count—enabling condition-based maintenance strategies when connected to a PLC or SCADA system.
The integrated Modbus RTU interface allows continuous monitoring of motor health parameters—such as current imbalance, thermal utilization, and start count—enabling condition-based maintenance strategies when connected to a PLC or SCADA system.
Application Field
The GE POM11-T20-C-A is extensively used across industries where motor reliability directly impacts production continuity and safety. In water and wastewater treatment plants, it protects submersible pumps and blowers from dry-run conditions (via undercurrent detection) and cable faults (via earth fault). Mining and mineral processing facilities rely on the GE POM11-T20-C-A to safeguard conveyor drives and crushers from damage caused by rock jams or belt misalignment, which manifest as sustained overloads or severe phase imbalance.
In oil & gas upstream operations, the GE POM11-T20-C-A monitors injection pumps and glycol dehydrators in remote well pads, where thermal modeling compensates for frequent starts in cold climates. Food and beverage manufacturers use it on mixers, fillers, and packaging lines to prevent motor burnout during product jams—minimizing batch loss and cleaning downtime. During MCC modernization projects, plant engineers replace bimetallic or basic electronic overloads with the GE POM11-T20-C-A to gain digital diagnostics, communication, and precise protection—without rewiring or panel redesign—making it a cornerstone of industrial motor management strategies worldwide.
Related Products
POM11-T20-C-B: Same functionality but with 2 Form C output relays instead of 1
POM11-T20-E-A: Enhanced version with Ethernet/IP and Modbus TCP support
POM12: Higher-end motor protection relay with IEC 61850, synchrophasor, and advanced analytics
F30: Legacy GE feeder protection relay—sometimes used for motor circuits in older designs
Multilin™ 469: Full-featured motor management relay with graphical display and advanced communication
SR750: Premium Multilin relay for large motors with differential protection and vibration monitoring
IC693CPU323: GE Fanuc PLC module often used alongside POM11 relays in integrated control panels
Installation and Maintenance
Pre-installation preparation: Mount the GE POM11-T20-C-A on a standard 35 mm DIN rail in a clean, dry enclosure with adequate airflow. Ensure all three phase CT leads are connected with correct polarity (dot-to-dot) and that CT secondary circuits are never left open. Set the internal DIP switches to match your CT ratio (1 A or 5 A) before powering up. Verify that the control power source falls within the 24–240 V AC/DC range specified on the label.
Maintenance recommendations: Perform annual functional tests using a primary or secondary injection test set to verify pickup accuracy of overcurrent and earth fault elements. After any motor trip, review the cause displayed on the LCD and log it for trend analysis. Keep firmware updated if future revisions are released (though the GE POM11-T20-C-A typically operates with stable embedded logic). Clean the display window periodically with a soft cloth—avoid solvents. Store a copy of the configured settings (noting DIP switch positions and front-panel values) so a replacement GE POM11-T20-C-A can be commissioned rapidly during emergencies.
