GE Multilin SR469-P5-HI-A20 – Motor Management Relay for Critical MV/LV Motors

The GE Multilin SR469-P5-HI-A20 is a proven motor protection relay built for continuous-duty pumps, fans, compressors, mills, and conveyors that simply cannot go down. It combines comprehensive protection, metering, and control with an enhanced front-panel HMI, making daily checks and fault diagnostics faster and more intuitive. From my experience, it’s a go-to choice in retrofit projects because it typically slips into existing GE Multilin 469 footprints with minimal rewiring.

• Complete motor protection suite – Thermal overload, jam/stall, phase loss/unbalance, negative sequence, ground fault (with ground CT), starts-per-hour, and start supervision cover most failure modes you see on medium-voltage motors.

• Enhanced HMI (HI) – A larger, easy-to-read display with dedicated keys for quick access to alarms, trends, and setpoints; you might notice field techs rely on it for first-pass troubleshooting.

• Universal power supply (P5) – Typically accepts 85–265 VAC or 90–300 VDC, which makes spares simpler across sites that use mixed control voltages.

• Analog output pack (A20) – Isolated 4–20 mA outputs for retransmission of key measurements (e.g., motor current, thermal capacity, kW) to DCS/PLC trending.

• RTD temperature monitoring – Supports up to 12 RTD channels (commonly Pt100/Ni120) for stator and bearing temperature, enabling smarter start inhibition and alarm logic.

• Rich event & start records – Time-stamped event logs and motor start reports help pinpoint nuisance trips and trend deterioration before it becomes a trip.

• Built-in communications – RS-485 Modbus RTU for SCADA/PLC integration; a front service port is typically available for setup via EnerVista tools.

• Rugged, plant-ready design – Wide operating temperature range and industrial immunity for noisy switchgear rooms and MCCs.

• 
  

• 
  

Notes: Exact option mix is defined by the code “P5?HI?A20”. Values above reflect typical SR469 family characteristics; confirm against your existing drawings when replacing a relay.

• Oil & Gas – MV pump trains, injection pumps, compressor motors with frequent starts and high thermal stress.

• Mining & Metals – Crushers, mills, conveyors where stall/jam protection and robust event logs save hours of fault-finding.

• Water & Wastewater – High-service pumps and blowers that benefit from RTD-based temperature supervision and starts-per-hour limiting.

• Pulp & Paper / Power Gen BOP – Large fans, refiners, induced draft/exhaust systems needing dependable unbalance and ground-fault protection.

• HVAC & Process – Chillers and process motors where 4–20 mA retransmission to BMS/PLC is required for trending.

• Reduced downtime – Detailed start reports and event logs cut troubleshooting time; in many cases, techs resolve issues without opening panels.

• Compatibility – The P5 power supply and Modbus RTU make integration straightforward with existing MCCs and PLCs.

• Lifecycle support – A widely deployed relay family; spares are easier to source and your team likely already knows the interface.

• Cost control – 4–20 mA outputs (A20) let you trend key metrics without buying additional transducers.

• Safety & compliance – Configurable trip/alarm logic supports plant safety standards and audit requirements.

• Panel & wiring – Install in a ventilated MCC or switchgear door. Use correctly rated 5 A CTs (and a separate ground CT if ground-fault is enabled). Maintain CT polarity and shorting blocks when commissioning.

• RTDs – For best noise immunity, run shielded RTD cables, ground the shield at one end only. Mix of Pt100/Ni120 is supported, but keep channels consistent per group.

• I/O interfacing – Use interposing relays where coil burden is uncertain. Map trips/alarms to DCS via Modbus and 4–20 mA outputs for redundancy.

• Environmental – Typically ?20…+60 °C; avoid condensing humidity. Allow rear clearance for cable bend radius and heat dissipation.

• Commissioning – Load settings with EnerVista tools, verify motor FLA, thermal model, and starts-per-hour. Perform primary injection or secondary current checks before energizing.

• Routine care – Back up settings after any change, review event logs monthly, clean vents annually, and keep firmware aligned with your fleet standard (after change control).

• CE marking; UL/cUL or CSA listings are commonly available for this relay family.

• RoHS-compliant design in most current builds.

• Manufacturer’s warranty typically 2 years; extended service options may be available depending on region.

Quick field note: one customer in a wastewater plant swapped a failed legacy unit with an SR469-P5-HI-A20 and was trending thermal capacity via 4–20 mA within the same shift—no extra transducers, just a tidy Modbus map update. That seems to be the sweet spot of this model: practical protection with low integration friction.