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489-P5-LO-A20 GE Module Parts Multilin 489 Generator Management Relay
The GE 489-P5-LO-A20 is a microprocessor-based generator management and protection relay from the GE Multilin 489 series. It is designed to protect, monitor, and manage synchronous and induction generator applications in industrial and utility power systems.
The relay integrates electrical measurement, generator protection, temperature monitoring, alarm processing, and control functions. It helps detect abnormal operating conditions and provides protective actions to reduce the risk of generator damage.
This model features 5 A phase current transformer (CT) inputs, a low-range control power supply, and 4–20 mA analog outputs. It is equipped with the basic display configuration.
| Parameter | Specification |
|---|---|
| Manufacturer | GE / GE Multilin |
| Model | 489-P5-LO-A20 |
| Product Series | Multilin 489 |
| Product Type | Generator Management and Protection Relay |
| Phase CT Input | 5 A secondary |
| Control Power – DC | 24–60 VDC |
| Control Power – AC | 20–48 VAC |
| AC Frequency | 48–62 Hz |
| Analog Outputs | 4–20 mA |
| Display | Basic display |
| Protection Functions | Generator electrical and thermal protection |
| Measurement Functions | Current, voltage, power, frequency, and power factor |
| Temperature Monitoring | RTD-based temperature monitoring, subject to configuration |
| Communication | RS232 / RS485 serial interfaces |
| Communication Protocol | Modbus RTU |
| Configuration Software | GE EnerVista 489 Setup |
| Mounting | Panel-mounted drawout relay |
| Typical Application | Generator protection and management |
The model number identifies the main hardware options:
| Code | Meaning |
|---|---|
| 489 | GE Multilin Generator Management Relay |
| P5 | 5 A phase CT secondary inputs |
| LO | 24–60 VDC or 20–48 VAC control power |
| A20 | 4–20 mA analog outputs |
The relay monitors generator electrical operating conditions and provides protection against abnormal current, voltage, and frequency conditions. Supported protection elements include:
- Phase overcurrent protection
- Ground fault protection
- Negative-sequence overcurrent protection
- Differential protection, where configured
- Overvoltage and undervoltage protection
- Overfrequency and underfrequency protection
- Reverse power and low forward power protection
The 489 continuously monitors important generator parameters, including phase current, voltage, active power, reactive power, frequency, and power factor.
With compatible RTD inputs and sensors, the relay can monitor generator winding, bearing, and other equipment temperatures. Temperature alarms and trip thresholds can be configured.
The A20 option provides 4–20 mA analog outputs for transmitting selected measured values to a PLC, DCS, or plant monitoring system.
The relay records alarms and operating events to help maintenance personnel investigate faults, abnormal conditions, and generator shutdowns.
Q1: What is the GE 489-P5-LO-A20?
It is a GE Multilin 489 generator management and protection relay designed to protect and monitor industrial and utility generators.
Q2: What does P5 mean in the model number?
P5 indicates that the relay is configured for 5 A phase CT secondary inputs.
Q3: What does LO mean in 489-P5-LO-A20?
LO identifies the low-range control power option: 24–60 VDC or 20–48 VAC at 48–62 Hz.
Q4: What does A20 mean?
A20 identifies the 4–20 mA analog output option.
GE 489 Generator Management Relay
,Multilin 489 Relay Module Parts
,489-P5-LO-A20 Relay Module
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