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GE Multilin 750-P5-G1-S1-HI-A20-R Feeder Management Relay

The GE Multilin 750-P5-G1-S1-HI-A20-R, also cataloged as the 750 Feeder Management Relay, operates as a dedicated hardware component for feeder protection, measurement, breaker control, and electrical fault analysis within GE Multilin distribution protection systems.

Hardware Specifications

Parameter	Specification
Model	750-P5-G1-S1-HI-A20-R
Brand	GE Multilin
Weight	8.5 kg
Dimensions	18 cm W x 16.5 cm L x 21.5 cm H
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Typical < 15 W, Maximum 35 W
Control Power Supply	90-265 VAC, 48-62 Hz / 105-300 VDC
Phase CT Input	5 A secondary
Ground CT Input	1 A secondary
Sensitive Ground Input	1 A secondary
Frequency Range	25 to 60 Hz nominal
Digital Inputs	Up to 12 configurable dry contact inputs
Output Relays	Up to 8 configurable output relays
Analog Inputs	8 DC current inputs, selectable 0-1 mA, 0-20 mA, 4-20 mA
Analog Outputs	2 channels, 4-20 mA configurable
Communication Interface	Dual RS485 Modbus RTU ports, RS232 front port
Communication Baud Rate	300 to 19200 baud
Display Interface	40-character backlit LCD with LEDs and keypad
Enclosure Rating	IP54 front panel
Mounting Type	19-inch rack mount or panel cutout draw-out case

Profinet / EtherNet-IP Network and Firmware Compatibility

The GE Multilin 750-P5-G1-S1-HI-A20-R integrates programmable protection logic, digital processing, and communication functions within a modular feeder relay platform. The relay executes FlexLogic control sequences for breaker operation, interlocking, alarm processing, and automation functions.

The device supports deterministic protection system communication through dual redundant RS485 interfaces using Modbus RTU protocol. Internal firmware management maintains compatibility between protection logic execution, metering functions, event recording, and configuration software environments.

The relay processes waveform capture data including 4 current channels, 3 voltage channels, 14 logic input states, and 8 output relay states for disturbance analysis and system diagnostics.

Frequently Asked Questions

Q: Does the 750-P5-G1-S1-HI-A20-R support hot-swap replacement of internal modules?
A: The relay uses a draw-out case architecture. Module removal and replacement shall follow the manufacturer-defined isolation and de-energization procedures. Live replacement capability is not specified for this model.

Q: What communication ports are available for control system integration?
A: The relay provides dual redundant RS485 rear communication ports supporting Modbus RTU and an RS232 front port for local configuration and maintenance.

Q: What CT input characteristics are provided for protection measurements?
A: The unit includes a 5 A phase CT input, 1 A ground CT input, and 1 A sensitive ground input with continuous and short-duration thermal withstand ratings defined by the relay protection specifications.

Field Installation Guidelines

Install the relay in a suitable panel or rack enclosure with sufficient clearance for wiring access and ventilation. Verify CT polarity, secondary grounding, and terminal identification before energization.

Use shielded communication cables for RS485 wiring where required by the installation environment. Connect cable shields according to the site grounding practice to reduce electromagnetic interference.

Separate CT circuits, control power wiring, analog signal wiring, and communication cables to minimize coupling between high-energy and low-level signal paths.

Confirm control power voltage selection matches the installed HI power supply range before applying auxiliary power. Verify protection settings, input assignments, output logic, and communication parameters during commissioning.

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