GE Multilin SR489-P5-LO-A20 Generator Management Relay

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Product Overview

GE Multilin SR489-P5-LO-A20 is a microprocessor-based generator management relay from the 489 series, designed for comprehensive protection, metering, monitoring and control of synchronous and induction generators in small-to-medium power generation systems.

Model suffix breakdown:

• SR489: Generator management relay series
• P5: 5 Amp phase CT secondary input
• LO: Low auxiliary control power supply (20–60V DC / 20–48V AC, 48–62Hz)
• A20: Four programmable 4–20 mA analog output channels
• No suffix for display: Standard basic front panel display

This relay integrates stator differential, 100% stator ground fault, loss of excitation, reverse power, over/under voltage, over/under frequency, negative sequence and overcurrent protection. It supports RTD temperature monitoring, fault oscillography, event logging and serial communication for SCADA/DCS integration. GE has discontinued the entire SR489 relay family. We supply surplus and fully refurbished SR489-P5-LO-A20 spare parts for legacy generator control cabinet maintenance, avoiding costly full system retrofit.

Key Features

✅ Full generator protection suite including stator differential and 100% stator ground fault protection ✅ P5 5A CT secondary input, compatible with standard 5A generator current transformers ✅ LO low auxiliary power: 20–60V DC / 20–48V AC, ideal for battery-backed low-voltage DC control cabinets ✅ A20 option: 4 isolated programmable 4–20mA analog outputs to transmit electrical parameters to DCS or PLC ✅ Standard basic front panel display and keypad for local parameter setup and fault review ✅ Up to 12 RTD inputs for stator winding and bearing temperature monitoring (Pt100, Pt1000, Cu10) ✅ 9 programmable digital inputs and 6 relay trip/alarm Form C output contacts ✅ Built-in fault event recorder and waveform capture for post-fault diagnostics ✅ Communication: RS232, dual RS485 ports, Modbus RTU, DNP3.0, IRIG-B time synchronization ✅ Drawout construction, easy removal for maintenance, panel cutout mounting

Technical Specifications

• Model: SR489-P5-LO-A20
• Brand: GE Multilin / GE Vernova / GE Grid Solutions
• Product Family: 489 Generator Management Relay
• CT Secondary Input: 5A (P5)
• Control Power (LO): 20–60V DC, 20–48V AC, 48~62Hz
• Analog Output: 4 × 4~20mA (A20)
• Display: Standard basic front panel display
• RTD Input: Max 12 channels, support Pt100, Pt1000, Cu10
• Digital Inputs: 9
• Output Relays: 6 Form C trip & alarm contacts
• Communication: RS232, Dual RS485, Modbus RTU, DNP3.0, IRIG-B time sync
• Frequency: 25 / 50 / 60 Hz
• Mounting: Panel mount, drawout module
• Operating Temperature: -40℃ ~ +70℃
• Humidity: 5% ~95% RH, non-condensing
• Protection Rating: Front IP54, rear IP30
• Certifications: CE, UL, IEC 60255

Applications

GE Multilin SR489-P5-LO-A20 relays are widely deployed for small & medium generator assets:

• Industrial cogeneration / CHP generator sets
• Small hydroelectric generator protection panels
• Backup generator control cabinets for factories, hospitals and data centers
• Oil & gas on-site distributed power generation
• Waste-to-energy and biomass power station generators
• Replacement spare parts for legacy GE 489 generator protection cabinets with low voltage DC battery supply

Product Supply Information

We provide fully tested GE Multilin SR489-P5-LO-A20 generator management relays for global power and automation buyers. The SR489 series is discontinued by GE. Available stock includes surplus and refurbished units.

• Complete functional, protection logic and communication testing before shipment
• 12-month warranty
• Anti-static packaging, secure export carton
• Shipping options: DHL, FedEx, UPS, sea freight
• Trade terms: EXW, FOB, CIF, DDP

FAQ

Q1: What does SR489-P5-LO-A20 suffix mean?

A: P5=5A CT secondary; LO=low auxiliary control power (20–60VDC / 20–48VAC); A20=four 4–20mA analog outputs; standard basic LCD display.

Q2: Is discontinued?

A: Yes, GE Multilin has discontinued the 489 generator relay series. We supply surplus and fully tested replacement units for legacy generator protection systems maintenance.

Q3: What is the difference between SR489 LO and HI power options?

A: LO = low auxiliary power (20–60VDC / 20–48VAC); HI = high wide-range control power (70–265VAC /90–300VDC). LO is suitable for battery-powered low voltage control panels.

Q4: What is the difference between SR489 A1 and A20?

A: A1 = 0~1mA analog outputs; A20 = 4~20mA analog outputs. A20 is the widely adopted standard for modern DCS systems.

Q5: What communication protocols does SR489-P5-LO-A20 support?

A: Dual RS485 and RS232 ports, Modbus RTU, DNP3.0, plus IRIG-B time synchronization for accurate event timestamping.

GE BRAND

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