GE Multilin 750/760 feeder management relay

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

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

field reports — community-sourced, unverified (checked 2026-06-11)

A user reported a Modbus communication issue where they were only able to receive one bit of data instead of the expected block of registers, indicating potential firmware or configuration mismatch issues. [source]
confirmed: comms defaults and framing — confirmed by GE Multilin 750/760 Instruction Manual
confirmed: EEPROM DATA ERROR message after firmware upgrade/downgrade — confirmed by GE Multilin 750/760 Instruction Manual
confirmed: Modbus register map addresses (e.g., Phase A RMS Current @ 768, Ground Current @ 772, Neutral Voltage @ 766) — confirmed by GE Multilin 750/760 Modbus Memory Map

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.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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