GE Multilin SR489 Digital Generator Relay SR489-P5-LO-A20
Manufacturer: GE Fanuc
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Part Number: SR489-P5-LO-A20
Condition：New with Original Package
Product Type: Generator Protection Relays
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The GE Multilin SR489-P5-LO-A20 (SR489-P5-LO-A20-E-H) operates as a high-performance digital management relay designed for industrial and utility-scale generators. This unit executes complex protection algorithms to safeguard rotating machinery against electrical and mechanical failures, including reverse power, loss-of-field, and unbalanced load conditions. By integrating programmable logic and breaker control, the SR489 simplifies substation architecture while providing real-time oversight via its local LCD interface. Its design prioritizes system uptime by detecting micro-anomalies before they escalate into catastrophic generator faults.
Part Number Breakdown
| Code Segment | Description |
| SR489 | Base Multilin Generator Management Series |
| P5 | 5 A Phase Current Inputs |
| LO | Low Control Power Range (24–48 VDC) |
| A20 | Standard 4–20 mA Analog Outputs |
| E | Enhanced Display / Ethernet Options (Variant dependent) |
| H | Harsh Environment Coating (Conformal Coating) |
Technical Specifications
| Parameter | Specification Detail |
| Model Number | SR489-P5-LO-A20 |
| Current Input | 5 A Nominal |
| Protection Elements | Overcurrent, Under/Over Voltage, Reverse Power, Loss-of-Field |
| Control Logic | Programmable logic with breaker control & auto-restart |
| Communication | Modbus RTU, RS232, RS485 |
| Monitoring | Time-stamped event recording and waveform capture |
| Mounting | Panel-mounted chassis |
| Dimensions | 177 mm x 177 mm x 200 mm |
| Operating Temp | -20 deg C to +60 deg C |
| Certifications | UL, CE, CSA, ANSI/IEEE |
Engineering Advantages
The SR489-P5-LO-A20 addresses specific industrial pain points through its advanced hardware and software profile:
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Superior Environmental Resilience: The "H" suffix denotes a specialized harsh environment coating. This conformal layer protects internal PCB components from corrosive gases and moisture, common in chemical processing and offshore power platforms.
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Deterministic Fault Analysis: Integrated waveform capture allows engineers to visualize electrical transients during a trip event. This precision enables rapid root-cause analysis and reduces downtime.
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Universal SCADA Bridge: Support for Modbus RTU across RS485 interfaces allows the relay to act as a data concentrator, feeding critical generator metrics directly to the plant's central control room without additional converters.
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Flexible Logic Programming: The FlexLogic™ engine allows users to create customized control schemes. This eliminates the need for external auxiliary relays for functions like sequential tripping or automated load shedding.
FAQs
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Is the SR489-P5-LO-A20 unit 100% Brand New?
Yes. We supply the SR489-P5-LO-A20 in 100% Brand New and Original condition. Each unit undergoes rigorous factory testing to ensure compliance with ANSI/IEEE protection standards.
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Can I replace a 1A input relay with this 5A model?
No. The "P5" designation specifies a 5A nominal current input. You must ensure your Current Transformers (CTs) are rated for a 5A secondary to maintain measurement accuracy and prevent saturating the relay inputs.
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How does the harsh environment coating affect the lifespan?
The conformal coating prevents oxidation and dendritic growth on copper traces. In industrial environments with high humidity or chemical vapors, this coating can extend the relay's operational life by up to 50% compared to non-coated variants.
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What software is required for configuration?
The relay utilizes the GE EnerVista SR489 Setup software for configuration, monitoring, and retrieving event reports. You can connect via the front RS232 port for localized commissioning.