Description

GE Multilin 489-P5-HI-A20-E-H Generator Management Relay

The GE Multilin 489-P5-HI-A20-E-H, also cataloged as the 489 Generator Management Relay, operates as a dedicated hardware component for generator protection, monitoring, and control within GE Multilin protection and automation platforms. The relay processes current, voltage, RTD, digital input, and analog output signals for generator electrical condition supervision.

Hardware Specifications

Parameter	Specification
Model	489-P5-HI-A20-E-H
Brand	GE Multilin
Weight	18 lb
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Typical 15 W, maximum 35 W
Series	489 Generator Management Relay
Control Power Supply	100-240 V AC (50/60 Hz), 125/250 V DC
Phase CT Inputs	5 A CT secondary
Ground CT Inputs	1 A or 5 A selectable secondary
VT Secondary Inputs	50 V to 240 V AC nominal phase-to-neutral / open delta
Analog Outputs	8 assignable channels, 4-20 mA DC
Analog Output Load	Maximum 1200 ohm
RTD Inputs	12 channels supporting 100 ohm Platinum, 100 ohm Nickel, 120 ohm Nickel, and 10 ohm Copper
Digital Inputs	9 assignable dry-contact inputs
Output Relays	6 output relays for Trip, Aux, Alarm, and Service functions
Communication Ports	Front RS232 and rear RS485 Modbus RTU
Protective Coating	Harsh environment conformal coating
Case Design	Fully drawout with automatic CT shorting

Profinet / EtherNet-IP and Industrial Relay Integration Characteristics

The GE Multilin 489-P5-HI-A20-E-H is designed around generator protection I/O processing with deterministic relay signal execution. Its firmware-based control structure manages phase current measurements, voltage supervision, thermal model calculations, and programmable output actions. The fully drawout case design incorporates automatic CT shorting during removal, reducing exposure during maintenance operations.

The relay supports firmware flash compatibility within the 489 platform architecture and maintains configuration parameters for protection functions including impedance time delay adjustment, negative sequence overcurrent pickup settings, phase distance offset mho characteristics, and sequential trip assignments.

Frequently Asked Questions (FAQ)

Q: What current input configuration is supported by the 489-P5-HI-A20-E-H?
A: The relay accepts 5 A nominal phase CT secondary inputs and provides selectable 1 A or 5 A ground CT secondary input configuration.

Q: Does the relay support direct analog signal transmission?
A: Yes. The A20 option provides 8 assignable 4-20 mA DC analog outputs with isolated output capability.

Q: What communication interfaces are available on this model?
A: The relay provides a front RS232 port and a rear RS485 port using Modbus RTU protocol.

Field Installation Guidelines

Install the relay in a compatible protective relay panel or drawout enclosure with adequate mechanical support and environmental protection. Verify CT polarity and secondary wiring before energizing the unit. CT circuits should remain properly terminated during installation and removal procedures.

Separate analog signal wiring, RTD cables, and communication cables from high-current power conductors to reduce electrical interference. Apply shielded cable practices according to site grounding standards, connecting cable shields at the recommended termination point.

Confirm control power wiring matches the selected AC or DC supply range before startup. Check all digital input dry-contact circuits, relay output connections, and RS485 communication termination settings before placing the relay into service.

Specifications

• Brand: General Electric

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems