GE Multilin 489-P5-LO-A20-E Low Voltage Generator Protection Relay

Product Description

The GE Multilin 489-P5-LO-A20-E is a generator protection relay engineered for both induction and synchronous generators. As part of GE’s SR family, which also includes the 469 Motor Protection Relay and 735 Feeder Protection Relay, the 489-P5-LO-A20-E provides advanced generator protection while also offering comprehensive motor protection features.

This relay operates at 25, 50, or 60 Hz and is designed with a user-friendly interface, including a 40-character LCD display, numeric keypad, and integrated RS232 port for programming and diagnostics. Its draw-out construction minimizes replacement time, while extensive I/O and communication options ensure seamless integration into modern power systems.

Technical Specifications

• Manufacturer: GE Multilin

• Model Number: 489-P5-LO-A20-E

• Product Type: Generator Protection Relay

• Frequency Range: 25, 50, or 60 Hz

• Front Panel Interface:

• LCD display (40 characters)

• Numeric keypad and status indicators

• RS232 port for local communication

• Back Panel Connectivity:

• 12 RTD inputs (programmable)

• 6 output relays

• 2 RS485 ports (ModbusRTU / DNP 3.0, up to 19200 bps)

• 4 VT inputs

• 4 isolated 4–20 mA analog inputs/outputs

• 7 assignable digital inputs

• 7 CT inputs for three-phase and ground current sensing

• Safety and filter ground connection

• Compliance: SWC, C37.990 EMI/RFI immunity standards

Key Features

• Advanced generator protection with voltage-dependent overload curves

• Comprehensive motor protection including torque metering and broken rotor bar detection

• Enhanced thermal model with multiple RTD inputs for stator monitoring

• Event reports, waveform capture, and data logging for troubleshooting

• Built-in simulation functions for simplified testing and commissioning

• Field-upgradable firmware and optional conformal coating for harsh environments

Application Scenarios

• Generator protection in industrial and utility systems

• Motor-driven generator applications requiring advanced thermal protection

• Integration into SCADA and energy management platforms

FAQ

Q: What frequency ranges does the 489-P5-LO-A20-E support?  

A: It can operate at 25, 50, or 60 Hz.

Q: Does this relay provide motor protection features?  

A: Yes, it includes torque metering, overload curves, and broken rotor bar protection.

Q: What communication protocols are supported?  

A: ModbusRTU and DNP 3.0 via RS485, with optional Ethernet and DeviceNet ports.