General Electric SR489-CASE 489-P1-HI-A20-E
General Electric SR489-CASE 489-P1-HI-A20-E
General Electric SR489-CASE 489-P1-HI-A20-E
General Electric SR489-CASE 489-P1-HI-A20-E
General Electric SR489-CASE 489-P1-HI-A20-E
General Electric SR489-CASE 489-P1-HI-A20-E
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SR489-CASE 489-P1-HI-A20-E

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General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay is a microprocessor-based protection and control device designed for synchronous and induction generator systems. It integrates protection, fault diagnostics, power metering, and RTU functions in a single drawout package, supporting reliable generator management in industrial power environments.
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Technical specifications for SR489-CASE 489-P1-HI-A20-E

  • Manufacturer:
    General Electric
  • Part Number:
    SR489-CASE 489-P1-HI-A20-E
  • Product Family:
    GE Multilin
  • Product Type:
    489 Generator Management Relay
  • Base unit:
    489 = 489 Generator Management Relay
  • Phase current inputs:
    P1 = 1 A phase CT secondaries
  • Control power:
    HI = 90 to 300 V DC; 70 to 265 V AC at 48 to 62 Hz.
  • Analog outputs:
    A20 = 4 to 20 mA analog outputs
  • Display:
    E = Enhanced display, larger LCD
  • Inputs:
    0 to 1 mA, 0 to 20 mA, 4 to 20mA (setpoint)
  • Input impedance:
    226 Ω ±10%
  • Conversion range:
    0 to 20 mA
  • Accuracy:
    ±1% of full scale
  • Type:
    Passive
  • Analog input supply:
    +24 V DC at 100 mA max.
  • Sampling Interval:
    50 ms
  • Frequency tracking:
    Va for wye, Vab for open delta; 6 V minimum, 10 Hz/s
  • Digital Inputs:
    9 opto-isolated inputs
  • External switch:
    dry contact < 400 Ω, or open collector NPNtransistor from sensor. 6 mA sinking from internal 4K pull-up at 24 V DC with; Vce < 4 V DC.
  • 489 sensor supply:
    24 V DC at 20 mA max.
  • Drawout:
    Fully drawout (automatic CT shorts)
  • Seal:
    Seal provision
  • Door:
    Dust tight door
  • Mounting:
    Panel or 19
  • IP Class:
    IP10A
  • Storage/Shipping temperatures:
    -40°C to 85°C
  • Operating temperatures:
    -40°C to 60°C
  • Altitude:
    2000m (max)
  • Weight:
    7.3 kg
  • Estimated shipping dimensions:
    21.5x22x25.5cm
  • Tariff Code:
    3811900000
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Environment Application Diagnostics

Features:

  • Integrates generator protection, fault diagnostics, and power metering in a unified relay platform
  • Supports flexible analog and digital signal processing with configurable inputs and outputs
  • Provides advanced event recording and waveform capture for detailed fault analysis
The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay is designed to deliver comprehensive protection and monitoring for industrial generator systems. It combines multiple operational functions into a single relay platform, reducing system complexity while maintaining precise control and measurement capability. The device is structured for synchronous and induction generator applications, ensuring stable operational support in demanding electrical environments.

In industrial power systems, the General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay plays a key role in detecting electrical faults and initiating protective responses. It processes analog and digital signals to monitor system conditions continuously. With integrated communication ports, it allows seamless connection to PLC and DCS platforms for centralized supervision and control.

The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay also supports detailed operational analysis through event logging and waveform capture. These functions help engineers identify abnormal conditions quickly and improve system reliability. Its drawout design and rack-mount compatibility make it suitable for modern industrial control panels where maintenance efficiency and safety are essential.

The SR489-CASE 489-P1-HI-A20-E General Electric 489 Generator Management Relay may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay Specs

General

  • Manufacturer GE / Bently Nevada
  • Model SR489-CASE 489-P1-HI-A20-E
  • Condition New Original ready stock
  • Product Family 489-P1-HI-A1-T,489-P1-LO-A20-T,489-P5-HI-A20-T
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Operating Temperature Range: The standard operating temperature range for the relay is -40 °C to +60 °C (-40 °F to +140 °F). Exceeding this range may limit the response speed and lifespan of the LCD display.
  • Humidity Limit: Maximum relative humidity up to 95% under non-condensing conditions. For harsh corrosive environments, a protective coating on the circuit board is recommended.
  • Vibration and Shock Resistance: Meets the mechanical vibration resistance requirements of IEC 60255, suitable for installation in switchgear or generator control panels subjected to general industrial vibration.
  • Insulation and Withstand Voltage: Supports power frequency withstand voltage testing up to 2.0 kV AC (for 1 minute), ensuring extremely high electromagnetic compatibility (EMC) and insulation reliability in high-voltage switchgear environments.
  • Small and Medium-Sized Generator Protection: As the main protection device for 1 ACT input, it provides differential, overcurrent, and overvoltage protection for synchronous or induction generators in industrial self-contained power plants.
  • Thermal Overload Monitoring: Real-time monitoring of generator stator winding and bearing temperatures via 12 RTD inputs prevents insulation damage due to overheating.
  • Islanding Operation Monitoring: In both grid-connected and islanded operation modes, loss-of-excitation protection (40) and underfrequency protection (81L) ensure generator stability during grid fluctuations.
  • SCADA System Integration: Utilizing its A20 option (4-20 mA analog output) and communication protocol, generator operating data can be remotely transmitted to a DCS or SCADA system for digital power distribution management.
  • Self-Test: The relay has a built-in continuous self-test program that monitors the operating status of the core processor, memory, and A/D converter. If a hardware fault is detected, the "Service" indicator on the panel will illuminate, and an alarm will be issued via the output relay.
  • Event Recording: The system can automatically store the timestamps of the last 64 events, including the type and time of protection triggering, and the current/voltage parameters at the time of the fault. These records can be retrieved and analyzed through the front and rear panel interfaces.
  • Oscillography: The system supports waveform capture during fault triggering, recording the current and voltage waveforms before and after the fault. This helps engineers accurately determine the fault location and the response of external systems.
  • Real-time Metering Diagnostics: The display screen allows real-time monitoring of stator current, terminal voltage, power factor, frequency, and RTD temperature. If the measured values ​​do not match the system's expectations, it can help determine whether the current transformer (CT/VT) polarity or wiring is correct.
Description
The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay is built as a microprocessor-based system for generator protection and operational management. It is designed for synchronous and induction generators and integrates multiple functions into one unified platform. The device supports phase current inputs with 1 A CT secondaries and is configured for control power ranging from 90 to 300 V DC or 70 to 265 V AC at 48 to 62 Hz. The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay is structured to combine protection, diagnostics, and monitoring in a compact architecture.

The system includes analog input capabilities supporting 0–1 mA, 0–20 mA, and 4–20 mA signals, with a conversion range of 0–20 mA and accuracy of ±1% full scale. It also provides 4–20 mA analog outputs and configurable transducer outputs for measured parameters. The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay ensures flexible signal handling through passive input design and 226 Ω input impedance, allowing stable measurement integration.

For system monitoring and protection logic, the General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay incorporates 9 opto-isolated digital inputs and supports external switch interfaces including dry contact and NPN transistor configurations. It also includes 6 output relays for trip and alarm functions. The unit provides fault response and control coordination within generator protection systems using integrated relay logic.

The device supports advanced diagnostics such as pre-trip data recording, waveform capture, event logging, and statistical analysis. It can store up to 256 time-stamped events and captures 16-cycle waveform data during fault conditions. The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay records minimum and maximum values for analog inputs and RTDs, enabling detailed post-event analysis and operational troubleshooting.

Communication capabilities are provided through three independent ports, including RS232 for local configuration, and dual RS485 ports for PLC, DCS, or PC integration. The system also supports frequency tracking with VT configurations and includes metering functions for real-time electrical parameters. The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay is delivered in a drawout SR-series format with automatic CT shorting and a fixed case structure for safe installation and maintenance.

The hardware design of the General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay includes a dust-tight door, seal provisions, and panel or 19-inch rack mounting compatibility. It operates within a temperature range of -40°C to 60°C and supports storage conditions up to 85°C. The system is engineered for industrial reliability with IP10A protection and altitude operation up to 2000 meters.
Alternative Names
489-P1-HI-A20-T 489-P1-HI-A20-E 489-P1-HI-A1-E 489-P1-LO-A20-E 489-P5-HI-A20-E
Technical notes
General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay is a microprocessor-based generator protection unit with 1 A phase CT inputs, 90–300 V DC or 70–265 V AC control power, 0–1 mA/0–20 mA/4–20 mA analog inputs, 226 Ω ±10% input impedance, ±1% full scale accuracy, 24 V DC analog input supply at 100 mA max, 50 ms sampling interval, 9 opto-isolated digital inputs, 6 output relays, RS232 and dual RS485 communication ports, IP10A protection, operating temperature -40°C to 60°C, storage temperature -40°C to 85°C, altitude up to 2000 m, and drawout SR-series case with automatic CT shorting.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What makes SR489 series suitable for generator protection?
The General Electric SR489-CASE 489-P1-HI-A20-E 489 Generator Management Relay integrates protection elements, metering, and diagnostics in a single platform for coordinated operation.
Why does SR489-CASE 489-P1-HI-A20-E use a drawout design?
The drawout structure allows safe removal and replacement while keeping CT circuits automatically shorted for operational safety.
How does SR489-CASE 489-P1-HI-A20-E handle fault detection and recording?
It captures pre-trip data, waveform recordings, and event logs, helping operators analyze faults with detailed historical information.
What types of signals can SR489-CASE 489-P1-HI-A20-E process?
It supports multiple analog inputs including 0–1 mA, 0–20 mA, and 4–20 mA signals with configurable outputs.
How does communication work in this system?
It provides RS232 and dual RS485 ports for integration with PLC, DCS, or computer-based monitoring systems.