Product Core Brief
- Model: 369B1859G0021
- Brand: GE Multilin
- Series: 369 Motor Management Relay
- Core Function: Protects and monitors medium AC motors with thermal overload, ground-fault, RTD temperature sensing, metering, and RS485 communications.
- Product Type: Motor Management Relay
- Key Specs: 50-300 VDC / 60-265 VAC control power | 12 RTD inputs | Metering package | RS485 Modbus RTU | 4 Form-C outputs
- Condition: New Original / New Surplus
Product Introduction
GE Multilin 369B1859G0021 is a GE 369-series motor management relay built for three-phase induction motor protection and monitoring. It delivers thermal overload, jam/stall, phase loss, unbalance, ground-fault, and RTD-based temperature supervision with true-RMS metering.
This configuration typically corresponds to a 369-HI-R-M-0-0-0-E build: wide-range control power, 12 RTD channels, metering package, RS485 Modbus RTU, and enhanced diagnostics. Manufacturing of the 369 series has been discontinued, with the Multilin 859 named as the successor.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | GE Multilin |
| GE Order Code | 369B1859G0021 |
| Typical Model Equivalent | 369-HI-R-M-0-0-0-E |
| Product Type | Motor Management Relay |
| Control Power | 50-300 VDC / 60-265 VAC, 50/60 Hz |
| Phase Current Input | 1 A / 5 A secondary CTs |
| Ground-Fault Input | Core-balance / residual ground CT |
| RTD Inputs | 12 channels (R option) |
| Metering Package | Included (M option) |
| Communication | RS485 Modbus RTU |
| Output Relays | 4 Form-C, up to 8 A @ 250 VAC / 30 VDC |
| Digital Inputs | Multiple optically isolated inputs |
| Event Records | Up to 512 time-stamped events |
| Operating Temperature | -40°C to +60°C (typical) |
| Mounting | Panel/flush mount |
Quality Control Process (DYNAMIC GENERATION)
- Front-panel and display check. We verify the LCD, keypad, status LEDs, and target indicators for full functionality.
- Control power-up test. The relay is energized at rated AC and DC levels to confirm stable startup, self-test pass, and no nuisance trips.
- RTD channel validation. Each RTD input is checked with known resistance values to confirm accurate temperature readings and correct alarm/trip behavior.
- CT and metering verification. We inject secondary current signals to confirm phase current measurement, ground-fault sensing, and metering accuracy.
- Relay output and communication test. All four Form-C relays are pulsed under load, RS485 Modbus RTU communication is verified, and the unit is anti-static bagged and foam-packed.
Replacement Pitfall Guide (DYNAMIC GENERATION)
❗ Confirm the full option code before swapping. The 369B1859G0021 typically maps to 369-HI-R-M-0-0-0-E. A base 369 without RTD or metering will not support the same wiring or setpoints.
❗ Do not mix 1 A and 5 A CT wiring. Mismatched CT ratios or incorrect programming will cause false overload, unbalance, or ground-fault trips.
❗ RTD wiring must use shielded cable. Unshielded RTD runs in MCC environments pick up noise and can cause false temperature trips. Ground the shield at the relay end only.
❗ Check relay output programming before commissioning. The 369 provides four Form-C outputs with fail-safe and non-fail-safe modes; incorrect programming can prevent a required trip or create an unwanted shutdown.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| GE Multilin 369B1859G0021 | GE Multilin 369B1859G0021 | Direct | Same order code; restore saved setpoints and communication settings. |
| GE Multilin 369B1859G0021 | GE Multilin 369-HI-R-M-0-0-0-E | Likely Direct | Typical equivalent; verify full option code and firmware before substitution. |
| GE Multilin 369B1859G0021 | GE Multilin 369-HI-0-0-0-0 | Needs Adaptation | Loses RTD and metering; wiring and protection logic must be reviewed. |
| GE Multilin 369B1859G0021 | GE Multilin 859 | Needs Adaptation | Official successor; same cutout and 369 terminal arrangement, but settings must be migrated. |
Benchmark highlights
- Output relays: 4 Form-C contacts, up to 8 A @ 250 VAC / 30 VDC resistive.
- Event log: up to 512 time-stamped events with pre-trip alarms and waveform capture support.
