SR489 GE Multilin 489-P5-HI-A20 | Generator Protection Module

Description

The GE Multilin 489-P5-HI-A20 is an industrial-grade generator management relay designed for dependable protection of small and medium synchronous generators. It continuously measures current, voltage, frequency, and RTD temperature channels, allowing engineers to maintain stable generator operation under dynamic load and grid conditions. Moreover, its embedded diagnostics and event recording tools help maintenance teams shorten troubleshooting time and improve long-term system reliability.

This model operates within demanding power environments, and its enhanced LCD display offers clear visibility during commissioning or on-site inspections. In addition, the relay integrates smoothly into modern control architectures, supporting multiple communication protocols for SCADA or substation automation platforms.

Technical Specifications

Model Number:

• 489-P5-HI-A20

Product Type:

• Generator Management Relay

Series:

• GE Multilin SR489

Phase Current Inputs:

• 5 A CT secondaries (P5 configuration)

Voltage Inputs:

• Standard VT inputs with configurable ratios

Analog Output:

• 4–20 mA monitoring outputs (A20 option)

RTD Inputs:

• Platinum 100 Ω

• Nickel 100/120 Ω

• Copper 10 Ω

Protection Functions:

• Overcurrent

• Thermal overload

• Ground fault

• Undervoltage/Overvoltage

• Underfrequency/Overfrequency

• Generator thermal modeling

Event & Data Recording:

• Waveform capture

• Trip logs

• Event history

Display:

• Enhanced LCD for improved visibility (E option)

Environmental Ratings:

• Operating temperature: –40 °C to +70 °C

• Ingress protection: IP40/IP65 (depending on enclosure)

Certifications:

• IEC 61850

• IEEE C37.90

• UL, CE

Shipping Weight:

• 12 kg

FAQ

1. What types of generators can the 489-P5-HI-A20 protect?
It supports small and medium synchronous generators commonly used in industrial plants, utilities, and distributed generation systems.

2. Does the relay offer remote monitoring capabilities?
Yes. It supports Modbus, Profibus, and DNP3 protocols, allowing seamless SCADA or DCS integration.

3. Can the analog outputs be used for real-time control?
The 4–20 mA analog channels deliver continuous monitoring signals suitable for control loops, trending systems, or external meters.

4. Is the enhanced LCD display beneficial for field technicians?
Yes. It provides larger, clearer character output, improving readability during commissioning or maintenance tasks.

5. What diagnostic tools are included?
The relay includes waveform capture, event logs, and trip records to support fast root-cause analysis.