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GE Multilin 750-P5-G5-S1-HI-A20-R-E Feeder Protection Relay

The GE Multilin 750-P5-G5-S1-HI-A20-R-E, also cataloged as the 750 Feeder Protection Relay, operates as a dedicated hardware component for feeder current monitoring, protection execution, and electrical network control within GE Multilin 750/760 series platforms.

Hardware Specifications

Parameter	Specification
Model	GE Multilin 750-P5-G5-S1-HI-A20-R-E
Brand	GE Multilin
Origin	United States
Operating Temp	-40 deg C to +60 deg C
Power Consumption	15 to 25 W nominal, 45 W maximum
Product Type	Feeder Protection Relay
Series	GE Multilin 750/760 Series
Mounting Type	Drawout case, flush mounting
Power Supply	90 to 300 V AC, 125 to 250 V DC
Phase CT Input	5 A nominal
Ground CT Input	5 A nominal
Sensitive Ground CT Input	1 A nominal
Frequency Tracking	16 Hz to 65 Hz automatic tracking
Communication Ports	RS232, dual RS485, optional Ethernet
Communication Protocols	Modbus RTU, DNP 3.0
Digital Inputs	14 optically isolated dry contact inputs
Output Contacts	8 Form-A / Form-C relay outputs
Analog Inputs	4 isolated analog inputs, selectable 0-1 mA / 4-20 mA
Analog Outputs	8 configurable analog outputs, selectable 0-1 mA / 0-20 mA / 4-20 mA
Protection Functions	50P/51P, 50G/51G, 50N/51N, 50SG/51SG, 27/59, 81O/81U, 46, 49, 79, 25
Front Protection Rating	IP54 front panel
Environmental Coating	Conformal coating option for harsh environments

Industrial Control Communication and Firmware Compatibility

The GE Multilin 750 series relay uses embedded microprocessor control architecture with configurable protection logic, metering functions, and communication interfaces. The unit supports RS232 and RS485 Modbus RTU communication channels, with optional Ethernet expansion capability. Firmware compatibility is managed through GE Multilin configuration tools and supported hardware revisions.

The relay supports deterministic data exchange between protection functions, metering channels, and supervisory systems. Configuration parameters include protection pickup levels, timing curves, input/output assignments, and communication settings.

Frequently Asked Questions (FAQ)

Q: Does the GE Multilin 750-P5-G5-S1-HI-A20-R-E support hot-swappable replacement?
A: The relay uses a drawout case design. Removal or insertion should follow the applicable electrical isolation procedure, as protection hardware replacement is not specified as a powered hot-swap operation.

Q: What CT inputs are supported by this model configuration?
A: The P5 option provides 5 A phase CT inputs, the G5 option provides 5 A ground CT inputs, and the S1 option provides 1 A sensitive ground CT input.

Q: What communication interfaces are available for integration with control systems?
A: The relay provides front RS232 and rear dual RS485 ports supporting Modbus RTU and DNP 3.0 protocols. Optional Ethernet communication is available through an expansion module.

Field Installation Guidelines

Install the relay in a compatible drawout panel assembly with correct mechanical alignment of the case and terminal connections.

Current transformer wiring should maintain proper polarity and phase identification. CT secondary circuits must remain isolated from unrelated signal wiring and should follow site grounding practices.

Communication cables should be routed separately from high-current power conductors. Shielded communication wiring should use appropriate termination and grounding methods according to the installation environment.

The conformal coating option should be considered where the relay is exposed to humidity, salt contamination, or airborne corrosive materials. Verify power supply voltage range before energizing the control supply terminals.

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