GE 489-P5-HI-A20 Generator Management Relay series

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GE 489-P5-HI-A20

GE 489-P5-HI-A20 is a model from the GE Multilin 489 Generator Management Relay series, used for protection, monitoring, and control of generators in industrial and power generation systems.

Meaning of the model code (489-P5-HI-A20)

• 489 → GE Multilin 489 Generator Management Relay platform
• P5 → 5A phase CT secondary input
• HI → High-range control power supply (typically 90–300 VDC or 70–265 VAC)
• A20 → 4–20 mA analog output capability

Key functions

This relay is designed to protect generators from electrical and operational faults, including:

• Overcurrent / overload protection
• Over/under voltage
• Underfrequency and reverse power protection
• Ground fault and system imbalance monitoring
• Generator startup and shutdown supervision

Communication & I/O (typical for this series)

• Modbus RTU and DNP3 communication support
• RS232 / RS485 serial ports
• 4–20 mA analog output
• Digital inputs/outputs for trip and alarm functions

Applications

• Industrial generator sets
• Power plants
• Backup and standby generator protection systems
• Marine and heavy industrial power systems