Description

The GE 489-P5-LO-A20 is a high-performance multifunction motor protection relay from GE’s Multilin™489 series,engineered to safeguard medium and low-voltage motors in demanding industrial environments.Featuring 5-amp secondary current inputs,integrated RTD monitoring,and advanced thermal modeling,the 489-P5-LO-A20 delivers comprehensive protection against overload,phase imbalance,ground faults,and voltage sags—while supporting modern communication protocols like Modbus TCP and IEC 61850 for seamless integration into digital substations and DCS platforms.

Application Scenarios

At a major LNG liquefaction facility in Qatar,repeated compressor trips during regional grid voltage dips caused costly production interruptions—each event costing over$500,000 in lost output and restart penalties.The root cause was traced to legacy electromechanical relays lacking ride-through capability.After retrofitting critical 6.6 kV compressors with GE 489-P5-LO-A20 relays configured with Low-Voltage Ride-Through(LVRT)logic,the system successfully weathered multiple 30%voltage sags lasting up to 300 ms without tripping.The 489-P5-LO-A20’s real-time thermal capacity tracking and adaptive undervoltage blocking prevented nuisance trips while still ensuring motor safety.Over two years,unplanned downtime dropped by 92%,proving how intelligent protection transforms reliability in energy-critical infrastructure.

Parameter

Main Parameters Value/Description

Product Model 489-P5-LO-A20

Manufacturer GE Grid Solutions(formerly GE Multilin)

Product Category Multifunction Motor Protection Relay

Current Input Rating 5 A(secondary),3-phase+ground

Voltage Input 3-phase line-to-line or line-to-neutral(for LVRT&metering)

Low-Voltage Operation(LO)Sustained operation down to 80 V AC(with external auxiliary supply)

Protection Functions Thermal overload,phase loss,ground fault,stall,jam,undercurrent,unbalance,LVRT

RTD Inputs 6 channels(Pt100/Ni120)for winding temperature monitoring

Communication Interfaces RS-485(Modbus RTU),10/100 Mbps Ethernet(Modbus TCP,IEC 61850,DNP3)

Display&Interface Backlit LCD with keypad,front USB port for configuration

Operating Temperature–20°C to+70°C

Standards Compliance IEEE C37.96,IEC 60255,UL/cUL,CE

Auxiliary Power 24–250 V DC or 88–265 V AC(wide-range,supports LO mode)

Technical Principles and Innovative Values

Innovation Point 1:True Low-Voltage Ride-Through(LVRT)Logic

The 489-P5-LO-A20 doesn’t just tolerate low voltage—it intelligently blocks trip signals during transient sags if thermal capacity remains safe.This prevents unnecessary shutdowns during grid disturbances while maintaining motor integrity.

Innovation Point 2:Advanced Thermal Modeling with RTD Fusion

Unlike basic I²t algorithms,the 489-P5-LO-A20 combines electrical heating calculations with actual RTD feedback to create a hybrid thermal model—accurately reflecting real winding temperature even during frequent starts or cooling interruptions.

Innovation Point 3:Cyber-Secure Digital Integration

With native IEC 61850 GOOSE messaging and secure Modbus TCP,the 489-P5-LO-A20 enables remote monitoring,automated breaker control,and predictive maintenance—bridging legacy motor control centers with Industry 4.0 architectures.

Innovation Point 4:Event Capture with Oscillography

On any fault or start event,the 489-P5-LO-A20 records 16 cycles of pre-and post-event waveforms(voltage,current,torque)—providing forensic data for root cause analysis and arc flash studies.

Application Cases and Industry Value

In a U.S.municipal water treatment plant,aging pumps were failing prematurely due to undetected single-phasing from loose terminations.After installing GE 489-P5-LO-A20 relays on all 200+HP motors,phase-loss events were detected within 10 ms—before insulation damage occurred.Maintenance teams used the relay’s event logs to pinpoint faulty contactors,reducing motor repairs by 75%in one year.Operators also leveraged the built-in energy metering to identify inefficient pumps,saving$85,000 annually in electricity.

Another success came from a steel rolling mill in Brazil,where the 489-P5-LO-A20’s stall protection prevented catastrophic gearbox damage during billet jams.By detecting abnormal current profiles within 20 ms and triggering a controlled shutdown,the plant avoided a$1.2M gearbox replacement—and cut unscheduled downtime by 30%.

Related Product Combination Solutions

GE 489-P1-HI-A20:1-amp version for use with high-ratio CTs in medium-voltage switchgear.

GE UR Series(e.g.,F650):Feeder management relays that coordinate with 489-P5-LO-A20 in integrated protection schemes.

GE Enervista 489 Setup:Official software for configuration,testing,and firmware updates of the 489-P5-LO-A20.

Multilin 369:Legacy motor relay—489-P5-LO-A20 serves as a direct functional upgrade with enhanced communications.

SEL-710:Competitor alternative—but 489-P5-LO-A20 offers superior RTD integration and LVRT logic for industrial motors.

ABB REF615:Comparable protection relay,yet 489-P5-LO-A20 excels in thermal modeling depth and GE ecosystem compatibility.

Rockwell PowerFlex 755:When paired with 489-P5-LO-A20,provides coordinated drive+motor protection with dual-layer safety.

GE D60:Line differential relay that can work in tandem with 489-P5-LO-A20 for critical motor feeder zone protection.

Installation,Maintenance,and Full-Cycle Support

Installing the GE 489-P5-LO-A20 follows standard panel-mount practices:connect 5A CT secondaries,voltage inputs,RTDs,and auxiliary power,then configure via front panel or Enervista software.Its universal power supply accepts both AC and DC,simplifying integration into existing MCCs.For LVRT functionality,ensure the auxiliary supply remains stable during sags—often achieved via local UPS or DC battery systems.

Maintenance is proactive rather than reactive:the relay’s self-diagnostics monitor CT health,RTD continuity,and memory integrity.Monthly reviews of thermal utilization logs help predict maintenance needs before failure.Firmware updates are delivered securely through GE’s support portal,with rollback capability.

Every GE 489-P5-LO-A20 we supply undergoes full functional validation—including thermal simulation,ground fault injection,LVRT response testing,and communication handshake verification.Units are cleaned,calibrated,and certified to original factory specifications.Backed by a 12-month warranty and supported by engineers with hands-on Multilin experience,we ensure your motor protection strategy remains robust,compliant,and future-ready.

Contact us for a protection coordination study,spare parts stocking program,or expedited delivery of genuine GE 489-P5-LO-A20 motor management relays to enhance the resilience of your critical rotating assets.

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