GE SR489-P1-LO-A20-E Multilin Generator Management Protection Relay

SR489-P1-LO-A20-E is a discontinued microprocessor-based generator protection IED from GE Multilin SR series, tailored for small & medium synchronous generators.

Suffix breakdown:

P1: 1A secondary CT input

LO: Wide-range low auxiliary power (DC20–60V / AC20–48V)

A20: Built-in 4–20mA analog output channels

E: Enhanced large LCD keypad display

It integrates full generator protection, RTD thermal monitoring, vibration analog input, fault oscillography, sequence of event recording and multi-protocol communication. 

Draw-out pluggable structure enables fast on-site replacement without cabinet shutdown, widely used in thermal power, industrial backup generator and cogeneration stations as maintenance 

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Technical Specifications

PN: SR489-P1-LO-A20-E, Manufacturer: GE Vernova Multilin, USA

CT Secondary: 1A phase current input

Aux Power: DC 20–60V / AC 20–48V, 48–62Hz

Analog Output: Multiple isolated 4–20mA

Display: Enhanced large LCD + full function keypad

Communication: RS232, RS485, optional Ethernet; Modbus RTU/TCP, DNP3.0

Protection Elements: 87G stator differential, 32 reverse power, 40 loss of excitation, 46 unbalance, 51V voltage restrained overcurrent, over/under freq, ground fault, thermal overload

Monitoring: Multi-channel RTD stator/bearing temperature, 4–20mA vibration analog input

Data Log: COMTRADE fault waveform capture, IRIG-B time synchronized event log

Mount: Draw-out plug-in panel mounting

Operating Temp: -20℃ ~ +60℃

Front Panel IP54, Rear IP20

Net Weight: ~1.3kg

Status: Obsolete, replacement model: Multilin 889 relayGE Vernova

Key Features

Complete dedicated generator protection suite covering internal short circuit, excitation loss, reverse power and thermal overload.

Supports RTD temperature and vibration analog monitoring for predictive maintenance of generator bearings and stator.

Draw-out pluggable design, quick hot swap to cut maintenance downtime.

Multi-channel 4–20mA analog outputs for real-time parameter transmission to DCS/SCADA.

Rich communication interfaces compatible with mainstream power station automation protocols.

Built-in fault waveform recorder and event sequence log for post-fault accident analysis.

Enhanced LCD HMI for local parameter setting, real-time data view and fault status check.

Wide-range universal auxiliary power supply, adaptable to unstable station DC/AC power grid.