Key Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 369-HI-R-M-0-0-0-E |
| Function | Motor protection, monitoring, and control for 3-phase AC motors |
| Control Power (HI) | 50-300 VDC / 60-265 VAC (verify nameplate) |
| Phase Current Input | 1 A or 5 A secondary CTs |
| Ground Fault Input | Sensitive ground CT input (50:0.025) or residual CT |
| RTD Inputs (R) | 12 built-in RTD channels (Pt100, Ni100, Ni120, Cu10) |
| Metering (M) | Voltage, kW, kVAR, kVA, PF, Hz, energy (requires VT inputs) |
| Communication | RS-485 Modbus RTU (rear); RS-232 (front); no optional Ethernet/Profibus/DeviceNet in this build |
| Digital I/O | 6 optically isolated digital inputs; 4 Form-C output relays (Trip, Aux 1, Aux 2, Alarm) |
| Analog Output | 1 standard analog output (4-20 mA typical) |
| Event Recording | Up to 512 time-stamped events; waveform capture (3 buffers, 16 cycles) |
| Operating Temp | -40°C to +60°C |
| Mounting | Panel/door mount; standard 369 cutout |
| Weight | Approx. 8-10 lbs (3.6-4.5 kg) |
Product Introduction
When a medium-voltage motor trips at 2 AM, the last thing you want is a protection relay that cannot tell you why. The 369-HI-R-M-0-0-0-E was built for exactly that scenario. It is a GE Multilin 369 with the three options that actually matter in the field: RTD inputs for stator and bearing temperature (R), full metering for voltage and power analysis (M), and the enhanced diagnostics panel (E) that gives you motor health reports and start data logging right on the front.I have commissioned enough of these to know that the thermal model is the real workhorse here. It learns the motor’s acceleration time, cooling rate, and inrush current, then builds a thermal capacity profile that tracks actual heating — not just a fixed curve. The 12 RTD inputs mean you can monitor stator windings, drive-end and non-drive-end bearings, and ambient temperature all from one relay. The M option adds VT inputs so you can see voltage unbalance and power factor, which often reveals mechanical problems masquerading as electrical faults. The E suffix gives you the enhanced panel with motor health reports. It is a solid, well-proven relay. Just remember: GE has discontinued the 369 line, so spares are finite.
Quality SOP & Tech Pitfalls
The Lab Report (SOP)
Visual inspection first — label match (369-HI-R-M-0-0-0-E), firmware revision, no burnt smell, no corrosion on terminals. Then it goes on the test bench. We apply control power and verify the HI range (50-300 VDC / 60-265 VAC). We inject secondary current into the phase CT inputs and confirm pickup on overload and ground fault elements. We check at least two RTD channels with a decade box or known Pt100. We verify the RS-485 Modbus RTU responds to a read request. We log the firmware version, photograph the label, and seal it in an anti-static bag. A Fluke 115 checks the control power rails and relay contact continuity.The Engineer’s Warning (Pitfalls)
Two mistakes cause unnecessary headaches. First, ordering a “369” without decoding the suffix. 369-HI-R-M-0-0-0-E is not the same as 369-HI-0-0-0-0-0. The R, M, and E options are factory-installed hardware. You cannot add them in the field without an OEM upgrade password — and even then, the hardware must be present. Second, grounding. The 369 has separate safety ground and filter ground terminals (typically terminals 126 and 123). Both must go to the main ground bus. Skip the filter ground, and you will chase noise problems on the RS-485 port for weeks. I once spent two days troubleshooting intermittent Modbus timeouts on a 369, only to find the filter ground wire had been left off during commissioning. The relay was fine. The grounding was not.
Installation & Configuration Guide
- Pre-Installation ⚠️
Confirm your control power matches the HI range (50-300 VDC / 60-265 VAC). Photograph the existing relay’s nameplate, setpoints, and wiring. Download the current setpoint file via EnerVista 369 if the old relay is still communicating. - Removal
Tag all CT, VT, RTD, and digital I/O wires. Disconnect control power and verify zero energy. Remove terminal block connectors carefully — do not pull wires by the insulation. Unbolt the relay from the panel. - Installation
Copy all setpoints before powering up. Mount the new relay in the panel cutout. Reconnect all terminals per the wiring diagram — pay special attention to CT polarity and RTD channel assignments. Connect both safety ground and filter ground to the main ground bus. - Power-On & Testing
Apply control power. Verify the display boots and shows no alarms. Upload or manually enter setpoints via EnerVista 369 or the front panel. Perform a secondary injection test on at least one phase and the ground fault element. Verify RTD readings on all connected channels. Test the trip relay output. Confirm Modbus RTU communication with the SCADA system.
Compatible Replacement Models
| Compatibility | Model | Notes |
|---|---|---|
| ✅ Drop-in Replacement | 369-HI-R-M-0-0-0-E | Same model, same options. Verify firmware revision and setpoint compatibility. |
| ⚠️ Software/Config Check | 369-HI-R-M-0-0-H-E | Adds harsh environment (conformal coating). Same core functions; verify setpoints. |
| ⚠️ Migration Path | GE Vernova 859 Motor Protection System | OEM-recommended replacement for discontinued 369 series. Requires panel cutout and wiring review. |
| ❌ Not Interchangeable | 369-HI-0-0-0-0-0 | No RTD, no metering, no enhanced diagnostics. Different hardware. |
| ❌ Not Interchangeable | 369-LO-R-M-0-0-0-E | LO control power (20-60 VDC / 20-48 VAC). Wrong power supply for HI applications. |
Frequently Asked Questions (FAQ)
Can I add the R or M option to a basic 369 in the field?
No. The R (RTD), M (metering), and E (enhanced diagnostics) options are factory-installed hardware. GE offered field upgrade passwords, but only if the hardware was already present in the unit. You cannot solder RTD inputs onto a basic 369.Is the 369-HI-R-M-0-0-0-E still being manufactured?
No. GE Vernova has discontinued the 369 series. The 859 Motor Protection System is the recommended replacement. New surplus and refurbished units are still available from distributors, but the supply is finite.What does the E suffix actually give me?
The E option adds the enhanced front panel with motor health reports, motor start data logger, enhanced event recorder, and security audit trail for setting changes. It is a software and display upgrade — useful for troubleshooting, but it does not change the protection elements.Can I use this relay on a VFD-fed motor?
Yes, the 369 is rated for VFD applications. However, you must adjust the thermal model and protection settings for the VFD operating profile. The metering accuracy on VFD output may differ from sine-wave conditions — verify with the OEM manual.Does it support Ethernet or Profibus?
Not in this build. The 369-HI-R-M-0-0-0-E has RS-485 Modbus RTU and RS-232 only. The 0-0-0 suffix means no optional Ethernet (E option), Profibus (P option), or DeviceNet (D option) cards are installed.What CT ratio should I use?
The 369 accepts 1 A or 5 A secondary CTs. Select the CT ratio based on your motor FLA so that full-load current falls in the middle of the relay’s measurement range for best accuracy. The relay auto-detects 1 A vs. 5 A CTs during configuration.
