Application Scenarios
Consider a large centrifugal compressor in a petrochemical plant, a asset where an unexpected motor failure can shut down an entire production unit and trigger losses measured in millions. The plant’s reliability team had been struggling with nuisance trips from a conventional thermal relay that could not distinguish between a genuine overload and the compressor’s normal high-inertia acceleration. By installing the GE 469-P5-AI-A1-E-H, they gained a relay that builds a real-time thermal picture of the stator, biased by up to 12 RTD temperature inputs on the windings and bearings and by negative-sequence current.
The difference was immediate. The relay’s start supervision function learned the compressor’s actual acceleration profile and began flagging only meaningful deviations, while the RTD inputs provided an early warning of a bearing temperature rise that the old relay would have missed entirely. When a developing single-phasing condition appeared during a voltage disturbance, the GE 469-P5-AI-A1-E-H detected it through its current unbalance element and issued an alarm with enough lead time for a controlled shutdown. This is the practical value the model delivers: it turns motor protection from a reactive trip function into an asset health management tool.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | GE 469-P5-AI-A1-E-H (also referenced as SR469-P5-AI-A1-E-H) |
| Manufacturer | GE Multilin, GE Vernova Grid Solutions |
| Product Category | Motor management relay / motor protection system |
| Series and Case | Multilin 469, SR-family draw-out case with automatic CT shorting on withdrawal |
| Phase CT Input | 5 A secondary, field selectable 1 A or 5 A for differential CT inputs |
| Control Power | 90 to 300 V DC or 70 to 265 V AC, 48 to 62 Hz, maximum 45 VA burden |
| Analog Outputs | Four 4-20 mA outputs (AI option), approximately ±1% accuracy |
| Analog Inputs | Four programmable inputs, 0-1 mA / 0-20 mA / 4-20 mA, 226 Ω input impedance |
| RTD Inputs | 12 assignable three-wire inputs, Pt100, Ni100, Ni120, or Cu10 sensors |
| Digital I/O | 9 optically isolated digital inputs, up to 6 Form-C output relays |
| Communication | Front RS232, two rear RS485 ports with Modbus RTU, optional 10Base-T Ethernet |
| Protection Functions | Thermal overload, short circuit, ground fault, unbalance, stall, undercurrent, voltage and frequency, single-CT differential, power and torque elements |
| Operating Temp. | -40 °C to +60 °C with reduced LCD contrast below -20 °C |
| Dimensions and Weight | Approximately 21.8 × 22.8 × 25 cm with case, about 7.3 kg |
| Product Status | Discontinued legacy platform, supported by 859 and 869 relay families |
