Product Overview

The GE 750-P5-G5-D5-HI-A20-R-E-H is a sophisticated microprocessor-based feeder management relay from GE Multilin’s renowned 750/760 series, engineered for comprehensive protection, control, and monitoring of medium-voltage distribution feeders. As a member of the SR family, this digital relay integrates advanced overcurrent protection with voltage, frequency, and arc flash detection capabilities into a single compact drawout case. The GE 750-P5-G5-D5-HI-A20-R-E-H represents a high-configuration variant of the 750 platform, combining robust hardware with extensive application flexibility for critical feeder and incoming line protection.

This model’s suffix code defines its full-specification status: P5 indicates 5A phase current inputs, G5 denotes 5A ground current inputs, and D5 confirms advanced protection with voltage/frequency/synchrocheck functions. The GE 750-P5-G5-D5-HI-A20-R-E-H is equipped with a wide-range HI power supply accepting 88–300 VDC or 70–265 VAC at 48–62 Hz, eight isolated 4–20 mA analog outputs (A20), a red breaker-closed LED indicator (R), an enhanced backlit LCD display with improved keypad (E), and conformal coating for harsh/humid environments (H). By consolidating protection, accurate built-in metering, and flexible communication into one unit, the GE 750-P5-G5-D5-HI-A20-R-E-H eliminates the need for separate auxiliary metering and interposing relay panels, reducing lifecycle costs while enhancing system reliability.

 

Technical Specifications

Parameter Name	Parameter Value
Product Model	GE 750-P5-G5-D5-HI-A20-R-E-H
Manufacturer	GE Multilin (GE Vernova)
Product Series	Multilin 750/760 Feeder Protection System / SR Family
Product Type	Digital Feeder Management Relay / Protection Relay
Phase Current Inputs (P5)	5 A secondary
Ground Current Inputs (G5)	5 A
Zero Sequence Inputs (D5)	5 A
Control Power (HI)	88–300 VDC; 70–265 VAC @ 48–62 Hz
Analog Outputs (A20)	Eight (8) 4–20 mA, programmable
LED Indication (R)	Red LED – Breaker Closed indicator
Display (E)	Enhanced backlit LCD with improved keypad
Harsh Environment Protection (H)	Conformal coating for humidity/corrosion resistance
Communication Protocols	Modbus RTU, DNP 3.0 Level 2
Optional Communication	10BaseT Ethernet port
Event Recording	512 time-tagged events
Oscillography / Waveform Capture	Up to 32 power cycles (10 records)
IRIG-B Time Synchronization	Supported
Firmware Version	6.00 (typical)
Hardware Revision	J (typical)
Power Consumption	25 VA nominal, 35 VA maximum
Mounting Style	Panel-mount with drawout case
Dimensions (W × H × D)	~178 mm × 165 mm × 216 mm (7″ × 6.5″ × 8.5″)
Net Weight	~7.6 kg (16.8 lb)
Operating Temperature	–40°C to +60°C (–40°F to +140°F)
Storage Temperature	–40°C to +80°C (–40°F to +176°F)
Humidity	Up to 95%, non-condensing
Ingress Protection (Front Panel)	IP54
Installation Manual	1601-0120-AE
Successor/Alternative	Multilin 850 Feeder Protection System

 

Main Features and Advantages

Comprehensive Protection and Control Functions: The GE 750-P5-G5-D5-HI-A20-R-E-H integrates an extensive library of ANSI protection elements, including phase/neutral/ground instantaneous and time overcurrent (50/51), undervoltage (27), overvoltage (59), negative-sequence voltage (47), underfrequency (81), synchrocheck (25), breaker failure (50BF), and arc flash detection. The GE 750-P5-G5-D5-HI-A20-R-E-H also supports advanced logic programming for bus transfer, cold load pickup blocking, and autoreclose (on 760 models), providing application flexibility for complex power systems.

Accurate Built-in Metering and Analog Outputs: The GE 750-P5-G5-D5-HI-A20-R-E-H provides precise measurement of voltage, current, power, power factor, demand, and harmonics, eliminating the need for auxiliary metering panels. Eight fully programmable, isolated 4–20 mA analog outputs allow mapping of any measured parameter for integration with external monitoring systems, SCADA, or DCS. This functionality makes the GE 750-P5-G5-D5-HI-A20-R-E-H an intelligent control node rather than a passive protection device.

Drawout Case Design for Zero-Downtime Maintenance: The GE 750-P5-G5-D5-HI-A20-R-E-H is housed in a drawout case with automatic CT shorting mechanisms, enabling safe removal and replacement from an energized panel without disrupting field wiring. This design dramatically reduces mean time to repair (MTTR) by allowing maintenance personnel to swap the relay in minutes rather than hours. The companion case contains no electronic components, making the GE 750-P5-G5-D5-HI-A20-R-E-H a true plug-and-play replacement unit.

Rugged Design for Demanding Environments: The “H” suffix on the GE 750-P5-G5-D5-HI-A20-R-E-H indicates conformal coating that protects internal circuitry against chemically corrosive and humid operating conditions. The relay operates reliably from –40°C to +60°C with IP54 front panel protection, ensuring stable performance in outdoor substations, industrial plants, and coastal installations. The GE 750-P5-G5-D5-HI-A20-R-E-H also features flash memory for field firmware upgrades without hardware replacement, protecting the investment over the equipment lifecycle.