GE Multilin SR489-P1-LO-A20-E Generator Management Relay

Product Description

The SR489-P1-LO-A20-E is a generator management relay manufactured by GE Multilin. It integrates generator protection, monitoring, metering and control functions. The P1 indicates 1A phase CT secondary input, LO stands for low voltage power supply (24–60V DC / 20–48V AC), A20 supports 4–20mA analog outputs, and E means enhanced LCD display and keypad. Widely used for small and medium generators in power plants and industrial power systems.

Features

• Complete generator protection: overcurrent, overvoltage, undervoltage, reverse power, loss of excitation, phase unbalance protection
• High-precision electrical metering: voltage, current, power, frequency, energy and harmonic measurement
• Multiple communication protocols, supporting data upload and remote configuration
• 4–20mA analog output for signal transmission to DCS/PLC
• Enhanced large LCD screen and friendly keypad for local parameter setting and fault checking
• High anti-interference capability, suitable for harsh electrical industrial environments

Application Scenarios

• Small and medium synchronous generator sets in power stations
• Captive power plants for petrochemical, mining, steel and water treatment industries
• Backup generator control and protection systems
• Industrial power distribution monitoring and generator control cabinets

FAQ

Q: What is the difference between P1 and P5?
A: P1 is 1A CT secondary input, P5 is 5A CT secondary input.

Q: What does LO power supply mean?
A: LO is low voltage supply, 24–60V DC or 20–48V AC, different from HI high voltage version.

Q: Can it connect to DCS system?
A: Yes, it supports 4–20mA analog output and serial communication for DCS connection.

Q: What is the function of suffix E?
A: E is enhanced version with larger LCD and improved keypad interface.