Product Core Brief
- Model: 760-P1-G1-S1-LO-A20-R
- Brand: GE Multilin (GE Vernova / SR Family)
- Series: GE 750/760 Feeder Management Relay
- Core Function: Digital feeder management relay for primary protection, control, and monitoring of distribution feeders on solidly grounded, high-impedance grounded, or resonant grounded systems.
- Product Type: Feeder Management / Protection Relay
- Key Specs: 1 A phase CT inputs | 1 A zero-sequence input | 1 A sensitive ground input | RS485 serial communications | 4–20 mA analog outputs | 20–48 VAC control power | draw-out case
- Condition: New Surplus / Refurbished (manufacturing discontinued; 850 series recommended as current alternative)
Product Introduction
The GE Multilin 760-P1-G1-S1-LO-A20-R is a member of the SR760 Feeder Management Relay family, designed for primary protection and management of medium- and low-voltage distribution feeders. It combines comprehensive overcurrent and ground-fault protection with built-in metering, event recording, waveform capture, and programmable I/O — all housed in a draw-out case that minimizes downtime during maintenance or replacement.
The order code breaks down as follows:
- 760: Feeder management relay with auto-reclose capability (760 only; 750 lacks recloser)
- P1: 1 A phase current inputs
- G1: 1 A zero-sequence (ground) current input
- S1: RS485/RS422 serial communications (Modbus RTU; DNP3 supported on this platform)
- LO: Low-range control power, 20–48 VAC at 48–62 Hz
- A20: Eight 4–20 mA analog transducer outputs
- R: Standard relay configuration
GE Vernova has discontinued manufacturing of the 750/760 family and recommends the 850 series as the current replacement platform. This makes the 760-P1-G1-S1-LO-A20-R a legacy spare — still widely used in existing installations but increasingly sourced through surplus channels.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Feeder Management Relay |
| Brand | GE Multilin (SR Family) |
| Model | 760-P1-G1-S1-LO-A20-R |
| Phase Current Input | 1 A (P1) |
| Zero-Sequence Input | 1 A (G1) |
| Sensitive Ground Input | 1 A (S1) |
| Control Power | 20–48 VAC, 48–62 Hz (LO) |
| Communications | RS485/RS422 serial (Modbus RTU, DNP3); front-panel RS232 for EnerVista |
| Analog Outputs | 8 × 4–20 mA (A20) |
| Protection Functions | Phase/ground overcurrent (50/51/67), sensitive ground (50SG/51SG/67SG), negative sequence (46), undervoltage (27), overvoltage (59), under/over frequency (81), reverse power (32), synchrocheck, auto-reclose (4-shot, 760 only) |
| Metering & Diagnostics | Full metering, event reports, waveform capture, data logger, IRIG-B time sync |
| Construction | Draw-out case, optional conformal coating for harsh environments |
| Software | EnerVista 760 for configuration, monitoring, and trend analysis |
Exact I/O counts, optional Ethernet port, and firmware-dependent features should be verified against the relay nameplate and installed firmware revision.
Quality Control Process (DYNAMIC GENERATION)
- Order-code verification: Confirm P1/G1/S1/LO/A20 matches the site CT ratios, control power supply, and SCADA interface requirements.
- Visual and mechanical inspection: Check draw-out cradle, connector pins, front-panel LCD/keyboard/LEDs, and rear terminal blocks for corrosion, bent pins, or heat stress.
- Control power test: Apply 20–48 VAC and verify relay boot-up, LCD display, and LED status indicators.
- CT input and metering check: Inject 1 A secondary current and verify phase, ground, and sensitive ground metering accuracy.
- Protection function test: Validate overcurrent, ground-fault, and reclose logic per site settings; verify trip contacts and 4–20 mA analog outputs.
- Communication test: Confirm RS485 Modbus/DNP3 communication with SCADA and RS232 connection to EnerVista software.
Replacement Pitfall Guide (DYNAMIC GENERATION)
❗ Do not confuse P1 with P5. P1 = 1 A CT inputs; P5 = 5 A CT inputs. Installing a P5 unit on a 1 A CT circuit will produce incorrect metering and protection errors.
❗ Do not substitute LO with HI without verifying control power. LO = 20–48 VAC; HI = 88–300 VDC or 70–265 VAC. Applying the wrong control voltage can damage the relay or prevent it from operating.
❗ Confirm the communications option. S1 = RS485/RS422 serial. If the site requires Ethernet, a different suffix (e.g., with optional Ethernet port) is needed.
❗ 760 vs. 750 matters. The 760 includes auto-reclose (up to 4 shots); the 750 does not. Replacing a 760 with a 750 will lose reclosing functionality.
❗ Download and back up settings before replacement. Even with the same order code, firmware revisions and site-specific setpoints must be transferred or reconfigured via EnerVista.
❗ Manufacturing is discontinued. GE Vernova recommends the 850 series as the current replacement. For new projects or long-term planning, consider migration to the 850 platform.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| GE 760-P1-G1-S1-LO-A20-R | GE 760-P1-G1-S1-LO-A20-R | Direct | Match full order code; back up settings via EnerVista before swap. |
| GE 760-P1-G1-S1-LO-A20-R | GE 760-P5-G5-S5-LO-A20-R | Not Direct | Different CT ratings (1 A vs. 5 A); not interchangeable without CT changes. |
| GE 760-P1-G1-S1-LO-A20-R | GE 760-P1-G1-S1-HI-A20-R | Needs Verification | Same CT/comms but different control power (LO vs. HI); verify supply voltage. |
| GE 760-P1-G1-S1-LO-A20-R | GE Multilin 850 series | Migration | GE Vernova’s recommended successor; requires engineering review for I/O and protocol mapping. |
Benchmarks:
- SR760 feeder management relay with 1 A phase, ground, and sensitive ground CT inputs.
- Low-voltage AC control power (20–48 VAC), suitable for AC control circuits.
- RS485 serial communications with Modbus RTU and DNP3 support; front-panel RS232 for EnerVista.
- 8 × 4–20 mA analog outputs for SCADA/PLC metering integration.
- Draw-out construction for fast replacement without disturbing panel wiring.
- Manufacturing discontinued; 850 series is the current GE Vernova replacement platform.
