Description
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Product Introduction
When your critical industrial large three-phase motor system needs ultra-reliable full-coverage protection performance to avoid unplanned downtime caused by electrical faults and overheating, this relay acts as the core motor protection and management hub.
It is a flagship digital motor management relay from GE Multilin, specially designed for synchronous and induction large three-phase motors. It integrates 15 standard thermal protection curves and supports custom curve programming, with 12 configurable RTD temperature input channels that can monitor the temperature of motor stator windings, bearings and other key components in real time. It is equipped with 10 configurable digital inputs and 4 control relay outputs, supporting Modbus RTU, Ethernet and other communication protocols, which can seamlessly connect with upper-level PLC and DCS automation systems. Its industrial-grade reinforced design fully adapts to harsh industrial site environments, making it a core replacement part for GE Multilin motor protection system maintenance and retrofit projects.
469-P5-HI-A20-E
469-P5-HI-A20-E
469-P5-HI-A20-E
469-P5-HI-A20-E
469-P5-HI-A20-E
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 469-P5-HI-A20-E |
| Product Type | Multilin SR469 Motor Management Relay |
| Manufacturer | GE Multilin |
| Country of Origin | USA |
| Phase Current Input | 5 A Phase CT Secondaries |
| Control Power | 90–300 V DC; 70–265 V AC (48–62 Hz) |
| RTD Inputs | 12 channels 3-wire (100Ω Platinum, 100Ω Nickel, 120Ω Nickel, 10Ω Copper) |
| Digital Inputs | 10 configurable channels |
| Analog Outputs | 4 channels 4–20 mA |
| Control Relay Outputs | 4 channels (Trip, Alarm, Aux, Service) |
| Display | Enhanced large LCD screen, 40 characters |
| Communication Interfaces | RS232, RS485 (Modbus RTU), Ethernet |
| Thermal Protection Curves | 15 standard curves + custom curve programming |
| Event Recording | 256 high-resolution event logs |
| Humidity Withstand | Up to 90% RH non-condensing |
| Operating Temperature Range | -20°C ~ +65°C |
| Net Weight | 4.8 kg |
| Installation Method | Standard industrial control cabinet panel mounting |
Field Application & Technical Pitfalls
Critical Industrial Scenarios
- **Large Petrochemical Plant Large Motor Protection System: Acts as the core motor management protection unit for large petrochemical production equipment such as compressors and pumps, ensuring the continuous and reliable operation of critical production motors through full-coverage fault protection.
- **Thermal Power Plant Induced Draft Fan Motor Protection: Delivers reliable motor protection performance for thermal power plant induced draft fan and forced draft fan motors, adapting to strong electromagnetic interference power plant environments, meeting the 24/7 continuous operation requirements of power production.
- **Metallurgical Rolling Mill Main Drive Motor Protection: Adapts to high-vibration and high-temperature metallurgical workshop environments, providing stable full-coverage protection support for the rolling mill main drive large three-phase motor.
Non-Negotiable Technical Pitfalls
- ⚠️ Bold Warning 1: Never arbitrarily use non-matching CT ratio parameters for configuration. The third current sampling channel will experience measurement deviation that causes the thermal protection action to be out of sync.
- ⚠️ Bold Warning 2: Skipping the pre-commissioning full protection action test will leave you with hidden protection refusal risks. This unit must confirm all protection action logics fully meet motor safety specifications before putting into operation.
- ⚠️ Bold Warning 3: Do not arbitrarily modify the thermal protection curve parameters during system operation. Unreasonable parameter settings will cause the motor to be frequently tripped or even burned out due to protection failure.
A large petrochemical plant maintenance team once swapped a 469-P5-HI-A20-E relay and skipped the protection action test. The hidden CT ratio parameter configuration error caused the motor to fail to trigger overload protection when overloaded, resulting in a 1.5-hour unplanned shutdown of the compressor.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against GE Multilin’s official SR469 part registry, confirm the part number 469-P5-HI-A20-E matches the factory label, and inspect no damage or deformation on all current input and communication connectors.
- Live Rig Testing: Power the unit in a calibrated GE Multilin motor relay test bench, apply standard current and voltage simulation signals, and confirm full 2-hour continuous stable operation.
- Parameter Testing: Verify all protection action functions meet factory specifications, confirm 12 RTD temperature sampling and 4 channels 4-20mA analog output functions operate correctly, and validate all status LED indicators and LCD display function properly.
- Final QA & Packaging: Seal the tested relay in a static-shielding anti-static bag, attach a unique QC passed serial label, and nest it in foam padding inside a rigid industrial shipping carton.
Frequently Asked Questions (FAQ)
- Can I hot-swap this relay while the motor system is running? No. You must first set the corresponding motor control circuit to maintenance blocking state and confirm the motor is in a safe shutdown state before removing the unit, otherwise you will trigger unexpected motor unprotected operation risks.
- What exact systems is this relay compatible with? It works natively with GE Multilin SR469 series motor protection systems, and cannot be directly used in non-matching GE motor control systems without custom adaptation.
- How long is the standard warranty for this new surplus unit? 12 months from delivery. It covers all manufacturing defects, but does not extend to units damaged by miswiring, improper protection parameter configuration, or overvoltage in the field.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine GE 469-P5-HI-A20-E relays have a laser-etched part number on the housing, not a printed sticker. Clone units almost always fail the full motor protection action performance test.
- What is the typical lead time for shipment? In-stock units ship within 48 hours. If you require official GE Multilin factory protection performance test documentation, add 2 extra business days to the turnaround window.
- Can this relay replace the older GE legacy SR469 motor management unit? Well, technically it fits the same standard control cabinet panel mounting dimensions, but you must confirm the protection parameter configuration fully matches the target motor before replacement to ensure 100% system compatibility.
