📌 Product Introduction

The GE Multilin SR469-P5-HI-A20 is a microprocessor-based motor management relay designed for protection, control, monitoring, and diagnostics of medium and large motors. The 469 platform combines thermal modeling, current and voltage protection, motor starting supervision, temperature monitoring, fault recording, and communication functions in one relay.

This configuration uses 5 A phase CT inputs, HI control power, and four 4–20 mA analog outputs. The relay can be installed in a panel or 19-inch rack arrangement and supports Modbus RTU communication.

GE has classified the Multilin 469 as a legacy product and states that manufacturing has been discontinued, with the 859 and 869 recommended as newer alternatives. This makes the exact SR469 configuration useful for replacement, maintenance, and existing-system spare requirements.

📊 Product Datasheet

Parameter	Specification
Brand	GE Multilin
Model	SR469-P5-HI-A20
Series	Multilin 469
Product Name	Motor Management Relay
Manufacturing Origin	Canada / GE Multilin product line
Product Status	Legacy / Manufacturing Discontinued
Phase Current Input	5 A CT secondary
Control Power	70–265 VAC, 48–62 Hz / 90–300 VDC
Analog Outputs	Four 4–20 mA outputs
Communication	Modbus RTU / RS-485
Mounting	Panel or 19-inch rack mounting
Display	Standard display
Construction	Draw-out relay construction
Typical Weight	Approx. 1.36 kg / 3 lb
Application	Medium and large motor protection and management

The exact dimensions and shipping weight can vary according to the complete mounting/case configuration. Verify the nameplate and mechanical drawing before cabinet replacement. GE provides SR469 assembly, front-view, mounting, and wiring drawings in its technical resource library.

 

⚙️ Main Functions

🔹 Thermal overload and motor thermal model protection
🔹 Phase overcurrent and ground overcurrent protection
🔹 Current unbalance and phase-loss protection
🔹 Undervoltage and overvoltage protection
🔹 Underfrequency protection
🔹 Mechanical jam detection
🔹 Loss-of-load protection
🔹 Motor start supervision and start inhibit
🔹 RTD temperature monitoring
🔹 Stator differential protection
🔹 Power and torque monitoring
🔹 Event recording and waveform capture
🔹 Motor operating and diagnostic data monitoring

The 469 architecture is specifically intended to combine motor protection and management functions rather than operate as a simple overcurrent relay.

 

🛠️ Operating Instructions & How to Use

Before installation, compare the relay nameplate with the motor protection design and confirm that the CT ratio, control voltage, motor rated current, voltage, frequency, RTD configuration, and required protection functions are compatible.

1. Install the relay into the designated panel or rack position.
2. Complete CT, voltage, control-power, digital-input, output, RTD, and communication wiring according to the applicable wiring diagram.
3. Verify CT polarity and secondary wiring before energizing.
4. Apply the correct HI control power.
5. Check the relay self-test and front-panel status indications.
6. Enter the motor nameplate information and protection settings.
7. Configure the thermal model and motor starting parameters.
8. Configure required current, voltage, temperature, ground-fault, jam, and load protection functions.
9. Configure Modbus communication if connection to a PLC, DCS, SCADA, or supervisory system is required.
10. Save and document the final settings before placing the motor into service.

GE’s training material specifically covers mechanical installation, wiring, thermal-model settings, digital I/O, RTD settings, communications, event recording, and fault simulation for the SR469.

 

🔌 Startup Sequence

⚠️ The exact switching sequence must follow the plant’s electrical safety procedure and the motor starter design.

Recommended commissioning sequence:

1. Keep the motor breaker/starter in the safe or open condition.
2. Confirm CT and control wiring.
3. Confirm that no CT secondary circuit is improperly open while the primary circuit is energized.
4. Energize the relay’s control power.
5. Wait for the relay self-test and normal status indication.
6. Review measured current, voltage, frequency, temperature, and alarm status.
7. Confirm protection setpoints.
8. Verify communication with the control system.
9. Perform required functional or secondary-injection testing.
10. Enable the motor starting circuit only after the relay and associated protection circuits are confirmed healthy.

 

⏹️ Shutdown Sequence

1. Stop the motor using the normal motor-control circuit.
2. Confirm that motor current has fallen to zero or the expected stopped condition.
3. Open and isolate the motor feeder according to the plant’s electrical isolation procedure.
4. If the relay itself must be removed, isolate its control power.
5. Verify absence of hazardous energy before disconnecting wiring.
6. Preserve the relay settings and event records when maintenance requires replacement.

Do not disconnect CT wiring from an energized primary circuit unless the CT circuit has been properly shorted and the applicable electrical safety procedure permits the work.

 

📖 Product Usage Notes

The relay should be configured around the actual motor rather than using generic factory protection values. Important information includes motor full-load current, starting current, acceleration time, service factor, voltage, frequency, CT ratio, ground-fault requirements, RTD type, and permitted starts per hour.

For an existing installation, it is good practice to download and save the relay configuration before replacement. GE provides dedicated procedures for downloading/saving SR469 setting files and communicating through the front RS232 and rear Ethernet interfaces.

For troubleshooting, review the relay’s actual values, alarms, event recorder, and fault information before changing protection settings. Randomly increasing trip thresholds can remove the protection margin without solving the underlying motor or wiring problem.

 

❓ Common Questions & Answers

Q: What is the SR469-P5-HI-A20 used for?
A: It is a motor management and protection relay for medium and large motors, combining electrical protection, thermal monitoring, motor starting supervision, diagnostics, and control functions.

Q: What does P5 indicate?
A: The P5 configuration is associated with 5 A phase CT secondary inputs.

Q: What does HI control power mean?
A: This configuration supports a high-range control-power input, including 70–265 VAC at 48–62 Hz and 90–300 VDC.

Q: Does this model provide 4–20 mA outputs?
A: Yes. The SR469-P5-HI-A20 configuration provides four 4–20 mA analog outputs.

Q: Can it communicate with a PLC or DCS?
A: Yes. The 469 supports communication functions including Modbus RTU, and GE provides procedures for RS232 and Ethernet communication depending on the installed configuration.

Q: Is the 469 still manufactured?
A: No. GE Vernova currently identifies the Multilin 469 as a legacy product and states that manufacturing has been discontinued. The 859 and 869 are listed as alternatives.

Q: Is SR469-P5-HI-A20 the same as every 469 relay?
A: No. The 469 family has different CT input, control-power, display, analog-output, communication, and environmental configurations. Always match the complete part number before ordering a replacement.

Q: Can it replace another 469 model directly?
A: Not necessarily. Check the complete model suffix, CT input rating, control power, output configuration, display option, communication hardware, wiring, and existing settings before substitution.

 

🔎 Recommended GE Multilin Models

1. Multilin 859 — Motor Protection & Management Relay
2. Multilin 869 — Advanced Motor Protection & Management Relay
3. Multilin 339 — Motor Protection Relay
4. Multilin 369 — Motor Protection & Control Relay
5. Multilin MM300 — Low Voltage Motor Protection Relay
6. Multilin MM200 — Low Voltage Motor Protection Relay
7. Multilin 750 — Feeder Management Relay
8. Multilin 350 — Feeder Protection and Management Relay
9. Multilin 745 — Transformer Management Relay
10. Multilin T35 — Transformer Protection Relay

GE’s current product listings include the 859, 869, 339, 369, MM300 and other Multilin protection products across motor and power-system applications.