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GE Multilin 369B1875G0003 Motor Management Relay

The GE Multilin 369B1875G0003, also cataloged as the 369B1875G0003 Motor Management Relay, operates as a dedicated hardware component for motor protection, monitoring, and control execution within GE Multilin 369 series protection platforms.

Hardware Specifications

Parameter	Specification
Model	369B1875G0003
Brand	GE Multilin
Origin	GE / General Electric Multilin series
Device Type	Digital Motor Protection & Management Relay
Operating Temp	-20 deg C to +60 deg C
Nominal Voltage Rating	120/240 VAC / VDC
Supply Voltage Range	70-265 VAC, 88-300 VDC
Frequency Rating	50 / 60 Hz
Current Inputs	1 A or 5 A CT secondary inputs
Communication Interface	Modbus RTU via RS485; optional Ethernet / Modbus TCP
Display Interface	Front-panel LCD with keypad and status LEDs
Mounting Configuration	Panel, draw-out case, or DIN rail mounting
Protection Functions	Thermal overload, phase overcurrent, locked rotor, ground fault, current unbalance, single phasing
Monitoring Functions	Current, voltage, power, energy metering, trip records, event logging, motor start history

GE Multilin Motor Protection and Control Functions

The GE Multilin 369B1875G0003 integrates motor thermal modeling, current measurement inputs, voltage monitoring, and programmable relay outputs for three-phase motor protection applications. The internal thermal model calculates motor heating conditions using electrical loading data and RTD input information where configured.

The relay supports motor fault analysis through event recording and trip history storage. Protection elements include phase overcurrent detection, locked rotor protection, stator thermal overload monitoring, ground fault detection, and current phase imbalance evaluation.

The 369 series hardware architecture provides programmable control outputs for trip commands, alarms, and process interlock signals. RS485 communication supports Modbus RTU data exchange for integration with supervisory control systems.

Frequently Asked Questions

Q: What current transformer inputs are supported by the GE Multilin 369B1875G0003?
A: The relay accepts standard 1 A or 5 A CT secondary current inputs for motor current measurement and protection calculations.

Q: Does the relay support direct network communication with control systems?
A: The unit provides Modbus RTU communication through RS485. Optional Ethernet-based Modbus TCP communication is available depending on configured hardware options.

Q: What installation factors must be considered for relay replacement or commissioning?
A: Replacement procedures require verification of terminal wiring, CT polarity, control power compatibility, communication addressing, and protection setting transfer before energization.

Field Installation Guidelines

Install the GE Multilin 369B1875G0003 in a suitable industrial control enclosure with proper mechanical support and environmental protection.

Verify all current transformer wiring before operation. CT secondary circuits must maintain correct polarity and avoid open-circuit conditions during energized operation.

Use shielded communication wiring for RS485 networks where required by site standards. Connect cable shields according to the control panel grounding practice to reduce electrical interference.

Separate low-level communication wiring from high-current motor power conductors to minimize electromagnetic coupling. Confirm control voltage, input configuration, and protection parameters before placing the motor circuit into service.

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