GE SR760 Feeder Management Relay: 760-P1-G1-S1-HI-A20-R

Technical Dossier

Product Details And Specifications

GE SR760 Series: Comprehensive Module Range and Technical Overview

The GE SR760 Feeder Management Relay is a numerical protection and control device engineered by GE Grid Solutions (formerly GE Multilin) for medium-voltage feeder and distribution applications. It is deployed across global heavy industry sectors including petrochemical plants, nuclear power stations, oil refineries, pulp and paper mills, and utility substations. The SR760 provides integrated overcurrent, earth fault, directional, and reclosing protection functions within a single 4U rack-mount chassis, making it a standard specification item in IEC and ANSI protection schemes worldwide. Its installed base spans hundreds of thousands of units across North America, Europe, and Asia-Pacific, with active deployments dating from the mid-1990s through the 2010s.

The Evolution of SR760 Architecture

The SR760 belongs to GE Multilin's SR Series numerical relay platform, which succeeded the earlier electromechanical and static relay generations in the early 1990s. The SR Series introduced DSP-based signal processing, replacing analog measurement circuits with digital sampling at 16 samples per cycle. Early SR760 firmware (v1.x–v3.x) supported RS-232 and RS-485 serial communications via Modbus RTU, which was the dominant SCADA protocol in the era of its introduction.

From firmware v4.x onward, GE introduced IEC 60870-5-103 support, enabling integration with modern energy management systems. Later hardware revisions added optional Ethernet ports (100Base-TX) and DNP3 over TCP/IP, extending the relay's compatibility into contemporary substation automation architectures based on IEC 61850. The SR760 ordering code encodes hardware configuration: the model string 760-P1-G1-S1-HI-A20-R specifies power supply type (P1 = 125/250 Vdc), ground fault input (G1), serial communications (S1 = RS-485), high-interrupting current inputs (HI), 20-amp CT inputs (A20), and reclosing functionality (R).

The SR760 has entered the mature/end-of-life phase of its product lifecycle. GE Grid Solutions has transitioned new projects to the SR750, SR735, and the current-generation UR Series (Universal Relay) platform including the T60, F60, and D60 relays. However, the SR760 remains in active service at thousands of sites globally, and long-term maintenance support — including spare unit sourcing, firmware archiving, and settings file migration — remains a critical operational requirement for asset owners.

SR760 Full Catalog & Functionalities (SKU List)

The SR760 ordering matrix generates a large number of valid configurations. The following represents the most commonly specified and traded SKUs, organized by functional variant:

Base Feeder Protection — Standard Current Input (5A CT)

760-P1-G1-S1-HI-A5-R: Standard 5A CT input, 125/250Vdc supply, RS-485, reclosing, high-interrupting.
760-P1-G1-S1-HI-A5: Standard 5A CT input, 125/250Vdc supply, RS-485, no reclosing option.
760-P0-G1-S1-HI-A5-R: 24/48Vdc auxiliary supply variant, 5A CT, RS-485, with reclosing.
760-P2-G1-S1-HI-A5-R: 120Vac auxiliary supply, 5A CT, RS-485, with reclosing.

High-Current Input Variants (20A CT)

760-P1-G1-S1-HI-A20-R: 20A CT input, 125/250Vdc supply, RS-485, reclosing — primary SKU for bus protection applications.
760-P1-G1-S1-HI-A20: 20A CT input, 125/250Vdc supply, RS-485, no reclosing.
760-P0-G1-S1-HI-A20-R: 24/48Vdc supply, 20A CT, RS-485, with reclosing.
760-P2-G1-S1-HI-A20-R: 120Vac supply, 20A CT, RS-485, with reclosing.

Ground Fault Variants

760-P1-G0-S1-HI-A5-R: No dedicated ground fault input, 5A CT, 125/250Vdc, RS-485, reclosing.
760-P1-G2-S1-HI-A5-R: Sensitive ground fault input (50mA), 5A CT, 125/250Vdc, RS-485, reclosing.
760-P1-G2-S1-HI-A20-R: Sensitive ground fault input (50mA), 20A CT, 125/250Vdc, RS-485, reclosing.

Communications Variants

760-P1-G1-S2-HI-A5-R: RS-232 serial port (S2), 5A CT, 125/250Vdc, with reclosing.
760-P1-G1-S3-HI-A5-R: Fiber optic serial communications (S3), 5A CT, 125/250Vdc, with reclosing.
760-P1-G1-S1-HI-A5-R-E: Ethernet 100Base-TX option added, 5A CT, 125/250Vdc, RS-485, reclosing.
760-P1-G1-S1-HI-A20-R-E: Ethernet 100Base-TX option added, 20A CT, 125/250Vdc, RS-485, reclosing.

Standard Interrupting Current Variants

760-P1-G1-S1-LO-A5-R: Low-interrupting current input (LO), 5A CT, 125/250Vdc, RS-485, reclosing.
760-P1-G1-S1-LO-A20-R: Low-interrupting current input (LO), 20A CT, 125/250Vdc, RS-485, reclosing.

Sourcing Hard-to-Find & Obsolete SR760 Parts

The SR760 series has been discontinued from GE Grid Solutions' active production schedule. OEM lead times for new units are no longer available through standard distribution channels, and factory repair services have been progressively withdrawn. For operators maintaining SR760-equipped switchgear and distribution panels, the primary sourcing strategy is the secondary market for tested surplus and refurbished units.

DriveKNMS maintains a dedicated inventory of SR760 units across the full ordering matrix, including low-volume configurations such as fiber optic communication variants (S3) and sensitive ground fault input models (G2). All units are sourced from decommissioned substation equipment, controlled-environment storage, and verified surplus channels. Inventory is cross-referenced against GE Multilin's original ordering documentation to confirm configuration accuracy before listing.

For sites requiring long-term maintenance support, DriveKNMS provides: verified surplus unit supply with full configuration documentation, firmware version identification and archiving, settings file (.sr7) backup and migration support for replacement units, and cross-reference to UR Series replacement relays (F60, T60) for sites planning platform migration.

Quality Control for the SR760 Range

The SR760's internal architecture includes a DSP measurement board, a CPU/communications board, a power supply module, and a front-panel HMI assembly. Each of these subsystems is subject to independent failure modes and requires targeted verification procedures.

DriveKNMS applies the following test protocol to all SR760 units prior to dispatch: power supply output verification at rated auxiliary voltage (24Vdc, 48Vdc, 125Vdc, 250Vdc, or 120Vac per model); current input accuracy check across all six CT input channels at 1A, 5A, and 20A (model-dependent); communications port functional test via Modbus RTU query on RS-485/RS-232 or Ethernet ping and DNP3 poll; protection element pickup verification for 50/51, 50N/51N, 67, and 79 function groups using a relay test set; HMI display and keypad functional check; and output relay contact resistance measurement for all trip and alarm outputs. Units that fail any test stage are quarantined and not offered for sale. Test records are retained and available upon request.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.