Description

GE Multilin SR750-P5-G5-S5-HI-A20-G Feeder Protection Relay

Configured for feeder protection, monitoring, and control execution in GE Multilin 750 Feeder Management Relay platforms, the GE Multilin SR750-P5-G5-S5-HI-A20-G (SR750 Feeder Protection Relay) provides direct physical and electrical execution for current sensing, breaker control, and power system diagnostics.

Hardware Specifications

Parameter	Specification
Model	SR750-P5-G5-S5-HI-A20-G
Brand	GE Multilin
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Typical 15 W, Maximum 35 W
Product Type	Feeder Protection Relay
Power Supply	88-300 VDC or 88-265 VAC, 45-66 Hz
Phase Current Input	5 A CT secondary
Ground Current Input	5 A CT secondary
Sensitive Ground Input	5 A CT secondary
Analog Outputs	8 assignable outputs, 0-20 mA or 4-20 mA DC
Communication Interfaces	Front RS232, Rear RS485 with Modbus RTU support
Digital Inputs	16 assignable opto-isolated inputs
Output Contacts	Up to 8 Form A / Form C contacts
Protection Functions	50/51 phase and ground overcurrent, 67 directional overcurrent, 27/59 voltage, 81 frequency, 50BF breaker failure, 49 thermal overload

Firmware Flash Compatibility and Industrial Network Integration

The SR750 platform uses programmable relay firmware with integrated FlexLogic control functions for custom protection and automation sequences. Firmware flash compatibility management defines the supported software environment for relay operation, configuration retention, and application updates.

The relay supports industrial communication through RS232 and RS485 interfaces with Modbus RTU protocol. The communication structure allows exchange of protection status, metering values, event records, and control commands with supervisory systems.

The hardware architecture provides current input processing for phase, ground, and sensitive ground protection channels. Waveform capture supports fault analysis with oscillography recording up to 32 samples per cycle, while the event recorder stores up to 256 time-tagged events.

Frequently Asked Questions

Q: Does the SR750-P5-G5-S5-HI-A20-G support hot-swap module replacement?
A: The available technical data does not specify hot-swap operation. Module replacement should be performed with the relay de-energized and according to approved maintenance procedures.

Q: What is the analog output load capability of the A20 option?
A: The A20 option provides 8 assignable analog current outputs with selectable 0-20 mA or 4-20 mA DC operation and supports a maximum load of 600 ohms.

Q: What environmental protection is provided by the G option?
A: The G option applies factory conformal coating for harsh industrial environments and is specified for ISA S71.04 Class G3 conditions.

Field Installation Guidelines

Install the relay in a suitable protective enclosure with appropriate clearance for wiring access and maintenance activities.

Connect CT secondary wiring using correct polarity and maintain separation between current circuits, control wiring, and communication cables. Shielded communication cables should follow standard industrial grounding practices to reduce electromagnetic interference.

Verify control power wiring before energization. Confirm that the supply voltage range matches the HI power input specification of 88-300 VDC or 88-265 VAC.

Route analog output wiring separately from high-current conductors. Use proper terminal tightening procedures and inspect all protective earth and enclosure bonding connections before commissioning.

Configure protection settings, communication parameters, and FlexLogic sequences according to the approved system protection design before placing the relay into service.

Specifications

• Brand: General Electric

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems