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Multilin 469

The SR469 Motor Protection System, a member of the SR family of relays, provides protection, control, simplified configuration and advanced communications in a cost effective industry leading draw-out construction. Designed for medium voltage motors, the 469 delivers advanced protection with customizable overload curves and single CT differential protection for added flexibility. The 469 also provides simplified configuration using the Motor Settings Auto-Configuration, providing a quick and easy set-up of motor parameters. Coupled with advanced protection and diagnostics, the 469 provides users the flexibility of multiple communication protocols allowing integration into new and existing control networks

Key Benefits

  • Voltage dependant overload curves, torque metering and protection, broken rotor bar protection

  • Most advanced thermal model - Multiple RTD inputs for stator thermal protection

  • Minimize replacement time - Draw-out construction

  • Complete asset monitoring - Temperature, Analog I/O, full metering

  • Improve uptime of auxiliary equipment - Through I/O monitoring

  • Reduce troubleshooting time and maintenance costs - Event reports, waveform capture, data logger

  • Built in simulation functions simplify testing and commissioning

  • Cost Effective Access to information - Through standard RS232 & RS485 serial ports, and optional Ethernet and Device Net Ports

  • Field upgradable firmware and settings

  • Optional Conformal coating for exposure


Protection and Management of three phase medium and large horsepower motors and driven equipment, including high inertia, two speed and reduced-voltage start motors

Protection & Control

The 469 is a digital motor protection system designed to protect and manage medium and large motors and driven equipment. It contains a full range of selectively enabled, self contained protection and control elements as detailed in the Functional Block Diagram and Features table.

Monitoring & Metering

The 469 includes high accuracy metering and recording for all AC signals. Voltage,current, RTD and power metering are built into the relay as a standard feature.


The following system values are accurately metered and displayed: Phase, differential and ground currents, average current, motor load, current unbalance. Phase-to-ground and Phase-to-phase voltages, average phase voltage, system frequency. Real, reactive, apparent power, power factor, watthours, varhours, torque Current and power demand. Analog inputs and RTD temperatures. Thermal capacity used, lockout times, motor speed


The 469 is equipped with monitoring tools to capture data. The following information is presented in a suitable format.

Event Recorder

The event recorder stores motor and system information with a date and time stamp each time a system event occurs. Up to 256 events are recorded.


The 469 records up to 128 cycles with 12 samples per cycle of waveform data for 10 waveforms (Ia, Ib, Ic, Ig, Diffa, Diffb, Diffc, Va, Vb, Vc) each time a trip occurs. The record is date and time stamped.

Advanced Motor Diagnostics

The Multilin 469 provides advanced motor diagnostics including a broken rotor bar detection function. The broken rotor bar detection is a condition maintenance function that continuously monitors the motor’s health while in operation. The advanced Motor Current Signature Analysis (MCSA) continuously analyzes the motor current signature and based on preset algorithms will determine when a broken rotor bar is present in the motor.


Key Features

  • Multiple Ports - 10baseT Ethernet, RS485, RS232, RS422, DeviceNet

  • Multiple Protocols - Modbus RTU, Modbus TCP/IP, DeviceNet

469 diagram.jpg

Functional Block Diagram

Multilin 469 Brochure

Multilin 469 Manual

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