Product Description

Overview

The GE Multilin SR489-P1-LO-A20-E is a generator protection relay designed for continuous monitoring and secure operation of medium-sized power generation units. It provides real-time supervision of electrical parameters and initiates protective actions when abnormal conditions emerge. Moreover, its integrated metering and advanced diagnostic tools help operators maintain generator efficiency while reducing unexpected downtime.

This model includes the P1 standard package, LO low-voltage auxiliary power supply, A20 enhanced I/O options, and the “E” feature set with expanded event recording. Therefore, it offers a reliable protection platform suitable for utility substations and demanding industrial power environments.

Technical Specifications

Model: SR489-P1-LO-A20-E
Series: GE Multilin SR489
Type: Generator Protection Relay

Protection Functions:

• Overcurrent

• Ground fault

• Negative sequence

• Loss of excitation

• Breaker failure

Control & Logic:

• Breaker management

• Reclosing

• FlexLogic™ programmable logic

Metering Functions:

• Current

• Voltage

• Frequency

• Power and energy

Event Recording:

• Sequence of events (SOE)

• Disturbance recording with multi-channel capture

Communication:

• Modbus RTU

• DNP3

• RS485

• Optional Ethernet

Electrical:

• Low-voltage auxiliary supply

• Configurable digital inputs

• Form-C relay outputs

Mechanical & Environmental:

• Panel-mounted withdrawable chassis

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

• Storage temperature: –40 °C to +85 °C

• Weight: 4.0 kg

FAQ

Q1: Does the SR489-P1-LO-A20-E support integration with SCADA systems?
Yes, it supports Modbus, DNP3, and RS485, with optional Ethernet for advanced integration.

Q2: What generator sizes are typically supported?
It is designed for medium-sized generators used in industrial plants and utility operations.

Q3: Is the relay withdrawable for maintenance?
Yes, its chassis design allows fast removal, which helps reduce downtime.

Q4: What auxiliary power supply does the LO version support?
The LO configuration typically supports 48–125 VDC or 120 VAC.

Q5: Does it include enhanced event recording features?
Yes, the “E” variant provides expanded recording capabilities for detailed fault analysis.