Description

The GE SR750-P5-G1-S1-HI-A20-R is a high-end multifunction motor protection and management relay from General Electric’s Multilin™SR750 series,designed to protect medium-and low-voltage motors in demanding industrial environments such as oil&gas,water/wastewater,mining,and power generation.

This model—part of GE’s(now GE Vernova)flagship motor protection platform—provides comprehensive protection,precise thermal modeling,power quality monitoring,and advanced communication capabilities.The suffix“-P5-G1-S1-HI-A20-R”decodes key hardware and firmware features:

P5:5 A secondary current transformer(CT)inputs

G1:One Form C auxiliary contact(alarm/trip output)

S1:Single isolated RS-485 port(Modbus RTU/DNP3)

HI:High-accuracy metering&harmonics(up to 63rd)

A20:125 VDC control power supply(±20%tolerance)

R:Retrofit-ready form factor(compatible with older Multilin mounts)

Critically,the SR750 includes Arc Flash Detection(AFD)via optional fiber-optic sensors and Advanced Thermal Modeling that adapts to motor start/stall conditions—preventing nuisance trips while ensuring true thermal safety.

Application Scenarios

At a Middle Eastern LNG export terminal,a 6.6 kV,3 MW refrigerant compressor motor suffered repeated insulation failures due to undetected phase unbalance and frequent hot starts.After installing the SR750-P5-G1-S1-HI-A20-R,engineers used its real-time thermal capacity tracking and start inhibit logic to enforce cooldown periods.The relay also detected a 7%voltage unbalance from a failing upstream transformer—triggering a maintenance alert before catastrophic failure.Over two years,unplanned downtime dropped by 90%,and motor rewind costs were eliminated.In this case,the SR750 acted not just as a protector—but as a predictive asset health guardian.

Parameter

Main Parameters Value/Description

Product Model SR750-P5-G1-S1-HI-A20-R

Manufacturer GE Grid Solutions→GE Vernova(Multilin™brand)

Product Category Multifunction motor protection&management relay

CT Input Rating 5 A(standard);supports 1 A via configuration

Voltage Inputs 3-phase line-to-line or line-to-neutral(up to 600 VAC direct,or PT-scaled)

Control Power 125 VDC(A20 option;range:100–150 VDC)

Protection Functions

–Phase over/under current

–Ground fault(residual or core-balance)

–Thermal overload(RTD or model-based)

–Phase reversal/loss/unbalance

–Stall/jam/underload

–Starts-per-hour limit

–Arc Flash Detection(with optional sensor)

Metering Accuracy±0.2%for voltage/current;±0.5%for power(Class 0.5S)

Harmonics Up to 63rd harmonic,THD,TDD logging

Outputs

–3 programmable Form C contacts(trip,alarm,etc.)

–1 fixed Form C(G1=auxiliary contact)

–Optional 24 VDC transducer output

Communications

–Ethernet(10/100 Mbps):IEC 61850-8-1(GOOSE/MMS),Modbus TCP,DNP3 LAN

–RS-485(S1):Modbus RTU,DNP3 serial

–IRIG-B or SNTP time sync

Cybersecurity Role-based access,audit trail,TLS/SSL,IEEE C37.240 compliance

Display Backlit graphical LCD with navigation keypad

Operating Temperature-40°C to+70°C

Standards Compliance IEEE C37.96,IEC 60255,UL 508,CSA,CE,RoHS

Mounting Flush panel or retrofit(replaces S30/S40/S70 with adapter)

Technical Principles and Innovative Values

Innovation Point 1:Adaptive Thermal Modeling–Uses real-time rotor temperature estimation based on load history,ambient,and cooling—far more accurate than fixed I²t curves.

Innovation Point 2:Integrated Arc Flash Mitigation–Detects light+current within 1 ms,triggering ultra-fast breaker trip to reduce incident energy.

Innovation Point 3:True Interoperability–Simultaneously serves IEC 61850 GOOSE to protection network and Modbus TCP to SCADA—no gateway needed.

Innovation Point 4:Motor Lifecycle Analytics–Logs starts,run hours,thermal cycles,and faults for predictive maintenance planning.

Application Cases and Industry Value

Water Treatment:Protected 4160 V sludge pumps in California;prevented burnout during dry-run events using underload detection.

Mining:Monitored 5 MW conveyor motors in Chile;used harmonic data to justify installation of active filters,reducing motor heating by 18%.

Pharmaceutical:Enabled FDA 21 CFR Part 11 compliance via secure audit logs of all relay setting changes.

Related Product Combination Solutions

GE Multilin™UR Series(e.g.,F650):For feeder protection where SR750 handles motor-specific logic.

SEL-710-5:Competing motor relay with similar thermal modeling.

Eaton E50G:Alternative with integrated soft-start control.

ABB PST/PSS Softstarter:Paired with SR750 for controlled acceleration+protection.

Siemens SIRIUS M200:Lower-cost alternative for non-critical motors.

GE Enervista UR Setup:Official software for configuration,testing,and event analysis.

Schneider EcoStruxure Power SCADA:Integrates SR750 data via Modbus TCP for enterprise visibility.

Phoenix Contact QUINT OR-ing diodes:Used in redundant 125 VDC control power systems.

Installation,Maintenance,and Full-Cycle Support

Installation:

Mount in switchgear door or cubicle with proper EMI shielding.

Connect 5 A CT secondaries(ensure correct polarity).

Wire 125 VDC control power with surge protection.

Configure protection settings using Enervista SR750 Setup software.

Maintenance:

Review event records monthly for abnormal starts or unbalance.

Verify arc flash sensor alignment(if installed).

Calibrate every 5 years(or per site reliability program).

We supply brand-new,factory-sealed GE SR750-P5-G1-S1-HI-A20-R relays,including:

✅Original packaging with calibration certificate

✅Latest firmware pre-installed

✅Full 24-month manufacturer warranty

✅Technical support for Enervista setup

Note:GE Vernova continues active production and support of the SR750 series as of 2025.

Obsolescence Advisory

The SR750 is NOT obsolete—it is GE Vernova’s current-generation motor management relay,succeeding the S30/S40/S70 lines.It is fully supported with regular firmware updates and cybersecurity patches.

For legacy replacements:

➡Use SR750-R variant for direct drop-in retrofits

➡Leverage Enervista Converter Tool to migrate old S-series settings

Contact us for configuration templates,arc flash sensor kits,or commissioning support for your GE SR750-P5-G1-S1-HI-A20-R.Protect your motors—not just from faults,but from hidden degradation—with intelligent,connected motor management from GE Vernova.

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