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Frequently inquire Together
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InquiryGE SR489-P5-HI-A20 Generator Management Relay
Configured for generator protection in Multilin 489 series systems, the GE SR489-P5-HI-A20 (SR489 generator management relay) provides direct electrical execution of phase, ground, and excitation monitoring functions.
Suffix Breakdown & Model Matrix
- 489: Multilin 489 series generator management relay
- P5: 5 A phase CT secondaries
- HI: High control power (90–300 VDC, 70–265 VAC at 48–62 Hz)
- A20: 4–20 mA analog outputs
- Display: Basic LCD (blank suffix)
- H: Harsh environment conformal coating
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SR489-P5-HI-A20 |
| Brand | GE Multilin |
| Origin | USA |
| Weight | 7.7 kg |
| Dimensions | Standard 489 series enclosure |
| Operating Temp | Control-room range |
| Power Consumption | Fuse rated 2.5 A, Littelfuse 215-02.5 |
| Input Voltage | 90–300 VDC, 70–265 VAC |
| Frequency | 48–62 Hz |
| Phase Inputs | 5 A CT secondaries |
| Analog Outputs | 4–20 mA |
| Display | Basic LCD |
| Standards | IEEE/ANSI C37.90.1, Class A emissions |
| Humidity | Up to 95% non-condensing |
| Protection Functions | Ground overcurrent curves (ANSI, IEC, IAC, Flexcurve, Definite Time), Loss of excitation trip (2 zones), Phase differential pickup |
| Pulse Outputs | +kWh, +kvarh, –kvarh |
Profinet / EtherNet/IP Deterministic Networks
The SR489 integrates into deterministic communication networks via rear terminal interfaces. Firmware flash compatibility ensures synchronization with supervisory systems. I/O density scaling supports multiple assignable digital inputs (1–7), while deterministic scan cycles maintain predictable timing for generator protection. Breaker and trip functions are executed with minimal latency, preserving deterministic operation across distributed automation networks.
Frequently Asked Questions
Q: Can the SR489 relay be hot-swapped during operation? A: No, the relay requires full de-energization before removal or insertion to prevent unsafe contact exposure.
Q: What is the switching delay in redundant configurations? A: Relay contact switching is designed within ±50 ms accuracy at 50/60 Hz, ensuring minimal delay in redundant setups.
Q: Is the fuse user-replaceable? A: Yes, the relay uses a 5x20 mm HRC SLO-BLO Littelfuse (model 215-02.5) rated at 2.5 A, accessible for replacement.
Field Installation Guidelines
- Mount relay securely in control panels with clearance for airflow.
- Route CT and VT wiring separately from communication cabling to minimize interference.
- Ensure grounding and shielding practices are applied to digital inputs and analog outputs.
- Confirm fuse installation and insulation levels before energizing.
- De-energize control power before insertion or removal to prevent undefined states.
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