GE Multilin 750/760 feeder management relay

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

point	address (0-based)	type	scale
general_status_alarm	512	U16	1
contact_1	516	U16	1
close_coil_monitor	517	U16	1
output_relay_status_1_trip	518	U16	1
neutral_voltage	766	U16	0.01
phase_a_rms_current	768	U16	1
phase_b_rms_current	769	U16	1
phase_c_rms_current	770	U16	1
ground_current	772	U16	1
a_n_rms_voltage	773	U16	0.01
b_n_rms_voltage	774	U16	0.01
c_n_rms_voltage	775	U16	0.01

link settings as documented (unverified): RTU/TCP; default 9600 8N1; unit ID 1; Supports Modbus RTU on serial ports (COM1, COM2, Front RS232) and Modbus TCP/IP over Ethernet (up to 4 sessions).

⚠ Relay contacts must be considered unsafe to touch when the 750/760 is energized! — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	Screw terminals on rear panel (slotted, pan head nickel plated #8-32x0.375")
A/B polarity	Correct polarity must be observed on RS485/RS422 (B1 for +, B2 for -) and logic inputs.
termination	Terminating impedance at each end typically 120 Ohms and 1 nF.
connector	RJ45 for Ethernet, 9-pin D-connector for front RS232, screw terminals for rear serial ports.
isolation	Analog outputs are fully isolated. Opto-coupled data interface for serial ports.
shield/ground	Shield (Ground) terminal B9 for serial, G12 for Safety Ground, G11 for Filter Ground. Shield should be grounded at one point only.
wiring notes	Fully drawout unit with automatic CT shorts.
protocol notes	EEPROM DATA ERROR message may be displayed after upgrading/downgrading firmware due to Modbus address rearrangement.
identification notes	The label found on the left side of the relay specifies its order code or model number.
power	LO: 20 to 60 V DC or 20 to 48 V AC; HI: 88 to 300 V DC or 70 to 265 V AC
environment	Operating temperature: -40°C to +60°C. Storage/Shipping: -40°C to +80°C. Humidity: up to 90% non-condensing. Pollution degree: 2. IP Rating: 40-X.
accuracy	Analog outputs accuracy: ±1% of full scale.
certifications	Meets CE drawout specifications, UL registered (UL # A3775), ISO9001:2000 registered.
doc revision	Manual P/N: 1601-0120-AE, Manual Order Code: GEK-106471N, September 2011
firmware applicability	Software Revision: 7.4x

generated by gemini:gemini-3.5-flash · harvested from https://www.gegridsolutions.com/products/manuals/750/750man-ae.pdf (GE Grid Solutions); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-11 · recorded 2026-06-11

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
interop-verified — Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.