Model: SR760 760-P1-G1-S1-HI-A20-R
Product Overview
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Datasheet Preview
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Commercial Path
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Technical Dossier
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.
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.
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.
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.
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