Description
Product Introduction & Engineering Value
Unexpected motor trips can halt an entire production process, yet replacing a failed relay with the wrong configuration often creates more downtime than the original fault. The SR469-P5-HI-A20 was developed to provide coordinated protection, diagnostics, and motor management for critical rotating equipment.
As part of the GE Multilin 469 family, this relay combines thermal modeling, motor current signature analysis, event recording, and communication capabilities into a single platform. It is widely deployed in medium-voltage motor applications where equipment availability and protection coordination are operational priorities.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE Multilin |
| Model | SR469-P5-HI-A20 |
| Product Type | Digital Motor Management Relay |
| Series | 469 Motor Protection System |
| Phase CT Input | 5 A Secondary |
| Control Power | 70–265 VAC (48–62 Hz) / 90–300 VDC |
| Analog Outputs | Four 4–20 mA Outputs |
| Communication Protocol | Modbus RTU |
| Serial Ports | RS232 and RS485 Standard |
| Optional Communications | Ethernet or DeviceNet (model dependent) |
| Motor Protection | Thermal Overload, Locked Rotor, Jam, Current Unbalance, Ground Fault, Differential Protection |
| Temperature Monitoring | Up to 12 RTD Inputs |
| Mounting | Draw-out Relay Construction |
| Typical Application | Medium-Voltage Motor Protection |
Field Application & The “Trench” Experience
During commissioning of a refinery cooling-water pump, operators noticed repeated motor trips during acceleration despite normal insulation resistance and acceptable bearing temperatures. The problem was eventually traced to an improperly configured overload curve after a previous relay replacement.
A correctly configured SR469-P5-HI-A20 restored proper acceleration supervision, allowing the motor to complete its start sequence while maintaining protection against genuine overload and locked-rotor conditions. No motor rewinding or starter replacement was required.
Typical applications include:
- Medium-voltage cooling water pump protection
- Catalytic cracking unit compressor motors
- Forced draft and induced draft fan motors in utility boilers
SR469-P5-HI-A20
Transparency SOP: QA & Testing
Before shipment, every relay follows a documented inspection process.
- Confirm model number, option code, and firmware identification.
- Inspect LCD, keypad, terminals, and draw-out mechanism.
- Verify power supply operation across the specified voltage range.
- Test CT, digital input, analog output, and communication functions.
- Confirm event logging, metering, and self-diagnostic operation.
- Package the relay using anti-static protection and impact-resistant materials.
New Surplus inventory is inspected for storage condition and authenticity, while refurbished units undergo functional verification before release.
The Veteran’s Tech Trap Guide
⚠️ Always Back Up the Settings First
The protection curves, RTD configuration, and trip logic are often customized for a specific motor. Installing a replacement without restoring the original settings can result in nuisance trips or inadequate protection.
⚠️ Verify CT Secondary Rating
The P5 configuration is designed for 5 A phase CT inputs. Installing it in a system wired for 1 A CTs will produce incorrect current measurements and protection calculations.
PRO TIP:
If the relay reports thermal overload immediately after startup, verify the programmed motor full-load current, acceleration time, and cooling constants before suspecting a hardware failure.
Dynamic FAQ
Q1. What does the SR469-P5-HI-A20 protect?
It protects medium- and large-horsepower AC motors against overload, phase unbalance, ground faults, locked rotor, mechanical jam, overtemperature, and other abnormal operating conditions while providing monitoring and diagnostics.
Q2. What does the “P5” option indicate?
The P5 designation specifies 5 A phase current transformer (CT) secondary inputs. Always match the relay to the installed CT secondary rating.
Q3. Does this relay support plant communication systems?
Yes. Standard models support Modbus RTU through RS232/RS485, while selected configurations can include Ethernet or DeviceNet communication options.
Q4. Is the Multilin 469 still manufactured?
No. The Multilin 469 has been discontinued by GE Vernova. The recommended migration path is the Multilin 859 or 869 series, although the SR469 remains widely available as New Surplus and refurbished inventory.
Q5. How is New Surplus inventory verified?
New Surplus units are inspected for model authenticity, physical condition, connector integrity, display operation, and proper storage condition. Functional verification is performed whenever compatible test equipment is available.
Q6. Is a warranty provided?
Most industrial automation suppliers offer warranty coverage for both New Surplus and professionally refurbished SR469-P5-HI-A20 relays. Warranty duration varies according to the product condition and supplier policy.
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