Description
Model: 369-C101
· Brand: GE Multilin (now GE Renewable Energy / Grid Solutions)
· Series: 369 Motor Management Relay Series
· Core Function: 🛡️ Comprehensive motor protection, monitoring, and control for medium-voltage motors
· Product Type: 📟 Digital Protective Relay
· Key Specs: 🛠️ Draw-out design, RTD inputs, thermal modeling, 100-240 V AC/DC control power
Key Technical Specifications
- Control Power: 100-240 V AC/DC universal supply
- Protection Functions: Thermal modeling (I^2t), overcurrent, phase reversal, ground fault, and jam detection
- Metering: True RMS current, voltage, and power monitoring
- Inputs/Outputs: 6 RTD inputs (100Ω Platinum/Nickel/Copper), 5 programmable output relays
- Communication: RS-485 Modbus RTU (standard), optional Ethernet ports
- Mounting: Draw-out case (19-inch rack-compatible)
- Programming Software: EnerVista 369 Setup Software
Application Scenarios & Engineering Insights
The 369-C101 is the industry standard for protecting large induction motors in petro-chem, mining, and water treatment plants. The biggest challenge with these relays isn’t the hardware failure itself, but “configuration drift.” Over years of operation, settings get tweaked by various maintenance teams, leading to nuisance trips. If you are replacing a unit, ensure you back up the existing configuration file (.369 file) from the original unit before it loses power.
Typical Use Cases:
- Mining – Conveyor Drives
Protecting large, high-inertia motors from stall and thermal overload during startup.
- Oil & Gas – Pump Station Control
Providing continuous monitoring of winding temperatures via integrated RTD inputs.
- Water Treatment – Blower Motors
Ensuring motor health for critical aeration processes that require 24/7 reliability.
Troubleshooting Pro-Tip:
If the relay shows a “Self-Test Error,” don’t automatically assume the hardware is dead. Check the control power stability first. A flickering DC supply in older switchgear cabinets is a notorious cause for false self-test alarms in these units.
Compatible Replacement Models
| Original Model | Replacement | Compatibility | Difference |
| 369-C101 | 369-C102 | ✅ Direct | C102 includes additional analog outputs |
| 369-C101 | 369-HI-C101 | ✅ Direct | Higher voltage/current sensing options |
| 369-C101 | Multilin 869 | ⚠️ Migration | Advanced protection; requires wiring changes |
Note: GE has moved toward the 8-Series for new installations. If your cabinet space is limited, sticking with the 369-C101 is the most cost-effective path to avoid cabinet modifications.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Action |
| Relay Will Not Power Up | Control power supply issue | Measure 100-240 V at terminals A1-A2 |
| “Trip” LED Flashing | Protection pick-up active | Check Diagnostic Buffer (EnerVista) for trip cause |
| RTD Reading “Out of Range” | Sensor or wiring fault | Verify RTD resistance (should be ~100Ω at 0 °C) |
| Comm Port Not Responding | RS-485 bias or address issue | Check baud rate, parity, and slave address |
Safety Warning: Always isolate the Current Transformer (CT) circuits before attempting to remove the draw-out relay from its chassis. Opening a CT secondary circuit while current is flowing will result in dangerous high-voltage spikes and potential equipment destruction.
