Feeder Protection Solution – GE Multilin 750-P5-G5-HI-A20-R | 750 Series
Where This Product Is Used
The GE Multilin 750-P5-G5-HI-A20-R Feeder Management Relay is purpose-built for medium-voltage feeder protection and control in utility distribution networks, industrial power systems, and critical infrastructure substations. Typical deployment environments include:
- Utility Distribution Substations – Primary and backup overcurrent protection for 4.16 kV to 34.5 kV feeder circuits
- Industrial Plant Power Distribution – Motor feeder protection in petrochemical, oil & gas, mining, and pulp & paper facilities
- Renewable Energy Collector Systems – Feeder bay protection in wind farm and solar plant MV collector networks
- Data Center & Critical Facility MV Switchgear – Reliable overcurrent and earth fault protection ensuring uptime for Tier III/IV facilities
- Water & Wastewater Treatment Plants – Feeder protection for pump station distribution boards
- Commercial High-Rise & Campus Distribution – Selective coordination in multi-feeder medium-voltage ring or radial networks
Technical Specifications
- Model / SKU: 750-P5-G5-HI-A20-R
- Series: GE Multilin 750 Feeder Management Relay
- Manufacturer: GE Grid Solutions (GE Multilin)
- Protection Functions: Phase overcurrent (50/51), Earth fault (50N/51N), Directional overcurrent (67/67N), Reclosing (79), Sync-check (25), Undervoltage (27), Overvoltage (59), Frequency (81O/U), Breaker failure (50BF)
- CT Input (P5): 5 A nominal current input
- VT Input (G5): 5 A / 120 V nominal voltage input
- Communications (HI): High-speed communications module (RS-485 / Modbus RTU + IEC 61850 GOOSE capable)
- Output Relays (A20): 20 output relay contacts
- Power Supply (R): Redundant / wide-range AC/DC power supply
- Mounting: Standard 19-inch rack / panel flush mount
- Operating Temperature: –40 °C to +60 °C
- Weight: ~300 g (relay module)
- Country of Origin: USA
Why Engineers Specify This Model
- Full Feeder Management in One IED – Combines protection, control, metering, and communications, eliminating the need for separate devices and reducing panel footprint.
- Redundant Power Supply (R suffix) – Ensures relay availability even during auxiliary power disturbances — critical for unmanned substations and remote feeder points.
- High-Speed Communications (HI module) – Native IEC 61850 GOOSE messaging enables peer-to-peer tripping and interlocking without hardwired I/O, accelerating fault clearance.
- 20 Output Contacts (A20) – Generous I/O count supports complex control schemes: breaker control, alarm annunciation, SCADA outputs, and interlock logic in a single chassis.
- Proven Multilin Platform – The 750 series has decades of field deployment across North American utilities and global industrial sites, with extensive GE EnerVista software support.
- Selective Coordination – Programmable time-overcurrent curves (IEEE, IEC, IAC) allow precise grading with upstream and downstream devices to minimize outage scope.
Complete System Bill of Materials
For a complete feeder protection panel using the GE 750-P5-G5-HI-A20-R, engineers typically specify:
- GE 750-P5-G5-HI-A20-R – Feeder Management Relay (this unit)
- GE EnerVista 750 Setup Software – Configuration and commissioning tool
- Current Transformers (CT) – 5 A secondary, metering class 0.5 or protection class 5P20
- Voltage Transformers (VT) – 120 V secondary, protection class 3P
- Test Plugs / CT Shorting Blocks – For safe relay withdrawal and testing
- RS-485 / Fiber Optic Communication Cable – For SCADA / DCS integration
- Auxiliary DC Power Supply – 24/48/110/125 VDC panel supply (redundant)
- Annunciator / HMI Panel – For local alarm display and operator interface
Compliance & Industry Standards
- IEC 60255 – Measuring relays and protection equipment
- IEC 61850 – Communication networks and systems in substations (GOOSE, MMS)
- IEEE C37.90 – Relays and relay systems associated with electric power apparatus
- ANSI/IEEE C37.2 – Standard for Electrical Power System Device Function Numbers
- UL 508 – Industrial Control Equipment (where applicable)
- CE Marking – European conformity for EMC and Low Voltage Directive
Quality Assurance & Sourcing
Konmask.com sources the GE 750-P5-G5-HI-A20-R exclusively through verified industrial automation distributors and authorized channel partners. Every unit undergoes the following before dispatch:
- Visual inspection for physical damage, label integrity, and firmware version verification
- Functional power-on test confirming relay self-diagnostics pass
- Serial number traceability logged against shipment records
- Original manufacturer packaging retained where possible
- Certificate of conformance available upon request
We do not supply counterfeit, refurbished-as-new, or grey-market units. All products carry applicable OEM warranty terms.
How to Source This Part
- In Stock: Contact us for real-time availability confirmation before placing your order.
- Lead Time: Typically 3–10 business days for stocked units; 4–12 weeks for factory-order items.
- Minimum Order: 1 unit
- Bulk / Project Pricing: Available for orders of 5+ units — request a formal quotation via email.
- Export & Cross-Border: We ship globally. Export documentation (EAR99 / ECCN classification) provided upon request.
- Payment: T/T bank transfer, PayPal, and major credit cards accepted.
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Application-Specific FAQ
Q: Can the 750-P5-G5-HI-A20-R replace an older GE MIFII or MIFIII relay?
A: Yes. The Multilin 750 series is the designated successor to the MIF family. Wiring adapters and migration guides are available from GE Grid Solutions.
Q: Does this relay support IEC 61850 Edition 2?
A: The HI communications module supports IEC 61850 Ed.1 natively. Ed.2 compatibility depends on firmware version — confirm with GE EnerVista release notes for your specific firmware build.
Q: What software is required for configuration?
A: GE EnerVista 750 Setup Software (free download from GE Grid Solutions). A USB-to-RS-232 or RS-485 adapter is required for local connection.
Q: Is the redundant power supply field-replaceable?
A: Yes. The R-suffix power supply module is a hot-swappable field-replaceable unit (FRU) on the 750 platform.
Q: Can this relay be used for arc flash detection?
A: The 750 platform supports high-speed instantaneous overcurrent elements (50H) that can be configured for arc flash duty in conjunction with arc flash detection sensors.
Q: What is the difference between P5 and P1 CT input options?
A: P5 = 5 A nominal CT secondary input; P1 = 1 A nominal CT secondary input. Specify based on your installed CT secondary rating.
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