GE Multilin 489-P5-LO-A20 Generator Protection Relay for Loss of Field and Reverse Power

The GE Multilin 489-P5-LO-A20 Generator Protection Relay for Loss of Field and Reverse Power is a generator protection and metering relay for small and medium generators, combining overcurrent, undervoltage and third-harmonic stator ground protection in an economical drawout design. Six Form-C output relays, seven configurable digital inputs and up to 12 RTD elements give it complete coverage of generator faults and temperatures. Sixty-four cycles of oscillography and 40-event recording make fault analysis straightforward after disturbances.

Key Specifications:

• Brand: GE Multilin
• Model: SR489 (order code: 489-P5-LO-A20)
• Type: 489 Generator Management Relay
• Application: Protection, metering and monitoring for small/medium generators
• Phase CT Inputs: P5 = 5 A phase CT secondaries
• Control Power: LO = low-range control power
• Analog Outputs: A20 = 4–20 mA analog outputs (configurable)
• Output Relays: 6 Form-C relays (1 trip, 3 auxiliary, 1 alarm, 1 self-test), 10 A
• Digital Inputs: 7 configurable
• RTD Inputs: Up to 12 elements (alarm/trip)
• Communication: RS-485 (300–19,200 bps), multiple ports
• Recording: 40 events; 64-cycle oscillography
• Country of Origin: Canada

GE Multilin 489-P5-LO-A20 Generator Protection Relay for Loss of Field and Reverse Power is built for generator sets where dependable protection and quick fault analysis matter. Third-harmonic stator ground protection catches ground faults that conventional relays miss, while oscillography and event recording give engineers the data to diagnose disturbances. The drawout construction keeps field replacement fast, and its economical design makes it a practical choice for small and medium generators.

  Xingchuang Ronghe (Fuzhou) Electrical Equipment Co., Ltd. is dedicated to delivering high-quality electrical equipment solutions, backed by professional product supply capabilities and a comprehensive technical service system. We stay customer-centric, continuously optimizing product performance and service experience. If you have any needs, you are welcome to contact us at any time for consultation and discussion. We look forward to partnering with you to create value together!