Description
The GE Multilin 369 (Model: 369-HI-R-M-0-0-H-E) is a high-performance digital protective relay designed specifically for the protection, monitoring, and control of medium-to-large AC motors. It is widely regarded as a benchmark in industrial motor protection, providing comprehensive monitoring of thermal capacity, current, voltage, and power, while utilizing advanced algorithms to detect faults such as motor stalling, phase reversal, and ground leakage.
📋 Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | 369 Motor Management Relay |
| Model Number | 369-HI-R-M-0-0-H-E |
| Power Supply | High-Range (HI): 88–265 V AC / 100–300 V DC |
| Input CTs | Standard 1A/5A Phase CT inputs |
| Communication | RS485 (Serial) / Ethernet (optional/model dependent) |
| Core Function | Thermal modeling (Motor thermal capacity monitoring) |
| Protection | Overload, Phase Unbalance, Undercurrent, Locked Rotor |
| Monitoring | RTD inputs for stator temperature monitoring |
| Mounting | Panel-mount (Standard draw-out case) |
| Enclosure | IP54 (Front panel) |
🔍 Model Breakdown (Code: 369-HI-R-M-0-0-H-E)
- 369: Base Platform.
- HI: High-range power supply (88-265 VAC / 100-300 VDC).
- R: RTD inputs included (standard for stator protection).
- M: Modbus RTU communication protocol.
- 0: No Analog Output.
- 0: No Conformal Coating.
- H: Horizontal display mount.
- E: Ethernet (10BaseT) communication port.
🚀 Recommended Series Integration
To maximize the protection capability of the 369 relay, these components are frequently integrated into the motor control center (MCC) architecture:
- CTs (Current Transformers) – Essential for providing the accurate current signal to the 369 relay.
- RTDs (Resistance Temperature Detectors) – Used for direct stator and bearing temperature monitoring.
- FlexLogic – The internal logic programming feature of the 369 for custom trip/alarm schemes.
- EnerVista 369 Setup Software – Necessary for configuration, setting management, and event analysis.
- External Trip/Close Coils – Actuated by the internal output relays of the 369 for motor starting and isolation.
⚠️ Integration and Safety Note
The 369 thermal model is the most critical feature. It simulates the motor’s actual heating based on measured current and ambient conditions.
When commissioning, ensure that the Full Load Amps (FLA), Service Factor, and Motor Class (overload curve) are accurately entered into the relay settings. Incorrect settings can either lead to “nuisance trips” during startup or, more dangerously, allow the motor to overheat without triggering a protection trip.
