GE 369-HI-R-M-0-0-0-E Multilin 369 Motor Protection Relays

General Electric 369-HI-R-M-0-0-0-E Multilin Motor Management Relay

The General Electric 369-HI-R-M-0-0-0-E, also cataloged as the 369 Motor Management Relay, operates as a dedicated hardware component for thermal protection, diagnostic recording, and ground fault execution within GE Multilin control networks. The relay processes 1 A or 5 A current transformer (CT) secondaries alongside 12 Resistance Temperature Detector (RTD) input channels, driving discrete trip contacts to safeguard medium-voltage AC motors under severe operating conditions.

Suffix Breakdown & Model Matrix

• 369: Base series designation for Multilin Motor Management Relay platform.
• HI: High control power supply range accepting 50-300 VDC or 60-265 VAC (50-60 Hz).
• R: Rear-mounted relay terminal output configuration.
• M: Advanced metering package including waveform capture and startup logging.
• 0: Standard option slot without additional optional card hardware.
• 0: Standard option slot reserved for baseline factory revision.
• 0: Standard option slot with default physical enclosure specifications.
• E: Enhanced front-panel user interface with display and control keys.

Hardware Specifications

Deterministic Ethernet Communications & Backplane Bus Velocity

The relay internal architecture processes continuous analog CT and RTD signal sampling cycles while maintaining high backplane bus communication velocity across external network ports. Internal firmware flash compatibility ensures synchronized event reporting, waveform capture, and startup data logging without degrading real-time protective tripping latency. Consequently, the device streams diagnostic metrics to supervisory SCADA environments without interrupting local trip logic execution.

Frequently Asked Questions

Q: How does the 369-HI-R-M-0-0-0-E manage thermal monitoring across motor windings and bearings?

A: The relay integrates 12 dedicated 3-wire RTD input channels supporting Pt100, Ni100, Ni120, and Cu10 sensors, executing real-time temperature tracking to prevent thermal isolation breakdown.

Q: What power supply levels are required to energize the internal processing circuitry?

A: The "HI" designation indicates a wide-range power supply module configured to operate from either 50-300 VDC or 60-265 VAC at 50-60 Hz.

Q: Can the internal protection elements detect low-frequency ground fault currents?

A: Yes, the dedicated ground fault measuring circuit evaluates residual or zero-sequence currents across a frequency spectrum of 20-100 Hz.

Field Installation Guidelines

1. Isolate all high-voltage power lines supplying the motor control center and verify zero potential prior to cabinet mounting.
2. Maintain proper ground bonding by running a low-impedance copper strap between the chassis earth terminal and the primary panel ground bar.
3. Wire CT secondary connections through shorting blocks to enable safe maintenance testing without opening the transformer circuit loops.
4. Route 3-wire RTD lead wires and serial communication cabling through grounded metal conduits separate from high-current motor power conductors.
5. Inspect all rear panel terminal blocks to verify screw connection torque and ensure the internal 3.15 A, 250 V fuse remains securely seated before applying control voltage.