GE 489-P5-LO-A20-T Generator Management Relay

489-P5-LO-A20-T Technical Specifications

Energy Metering Description	Continuous Total of +watthours and ±varhours
Ground Current Input CT Secondary	5 A or 50:0.025 (HGF CTs)
Neutral Voltage Input VT Ratio	1.00 to 240.00:1 in steps of 0.01
Overfrequency Required Voltage	0.50 to 0.99 × rated voltage in Phase A
Relative Humidity Cyclic Reference Standard	IEC60068-2-30
Relative Humidity Cyclic Test Level	6day Variant 2
RS485 Ports	2, Isolated Together at 36 Vpk
RTD Inputs Short/Low Alarm	<–50°C
Manufacturer	General Electric Multilin
Part Number	489-P5-LO-A20-T
Series	489 Generator Management Relay

GE 489-P5-LO-A20-T Generator Management Relay: Key Features and Specifications

The 489-P5-LO-A20-T is a model within the 489 Generator Management Relay Series that features an enhanced display with a 10Base-T Ethernet connection.

Special wiring specifications apply due to the Ethernet connection.
When removing the relay from its case, the RJ45 connector must be disconnected to prevent damage.
When inserting the relay back into the case, ensure the Ethernet cable has enough room to prevent it from getting caught, which could damage the cable or interfere with the terminal blocks’ proper insertion.

The 489-P5-LO-A20-T relay has a wide variety of terminal types.
Examples of terminals include: G10 HGF Ground CT, D02 RTD #7 Compensation, E01 1 Trip NC, F12 IRIG-B –, and more.
A comprehensive list of all terminals and their descriptions can be found on page eight of chapter three in the GEH-10649N 489 Generator Instruction Manual.
General wiring considerations, control power specifications, and current inputs (and their uses) are also detailed in chapter three of this manual.

The relay’s faceplate features three different groups of LED indicators:
- Status of the 489 model itself.
- Output status.
- Status of the connected generator.
A comprehensive list of all LEDs and their functions is provided in chapter four (heading 4.1.2) of the GEH-10649N 489 Generator Instruction Manual.