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Legacy Motor Protection

Home > Grid Automation > Protection Relays > Legacy Motor Protection > 469

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Multilin 469 - Legacy
Motor Protection System

Manufacturing for 469 has been discontinued. As an alternative, please refer to the 859 or 869 relays.

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-Configurator, 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 dependent 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 DeviceNet Ports
  • Field upgradeable 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
Monitoring & Metering
Retrofit Kit

Key Features

  • Thermal model biased with RTD and negative sequence current feedback
  • Start supervision and inhibit
  • Mechanical jam
  • Voltage compensated acceleration
  • Undervoltage, overvoltage
  • Underfrequency
  • Stator differential protection
  • Thermal overload
  • Overtemperature protection
  • Phase and ground overcurrent
  • Current unbalance
  • Power elements
  • Torque protection
  • Dual overload curves for 2 speed motors
  • Reduced voltage starting control

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.

469 Block Diagram

Key Features

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.

View motor status using digital inputs, analog inputs and RTD inputs View motor status using digital inputs, analog inputs and RTD inputs

Key Features

Front Panel

Multilin 469 Front Panel

EnerVista™ Software

The EnerVista™ Suite is an industry leading set of software programs that will simplify every aspect of using the 469 relay. Tools to monitor the status of your motor, maintain your relay, and integrate information measured by the 469 into HMI or SCADA monitoring systems are available. Also provided are the utilities to analyze the cause of faults and system disturbances using the powerful Waveform and Sequence of Event viewers that come with the 469 Setup Software that is included with each relay. Learn More

Motor Settings Auto-Configurator Create complete settings files for your SR469 in 6 simple steps using the Motor Settings Auto-Configurator.

8 Series Retrofit Kit

8 Series retrofit kit

Explore the 8 Series Retrofit Kit

Retrofit Existing SR 469 Devices to the Multilin 869 in Minutes

Traditionally, retrofitting an existing relay has been a challenging, time consuming task often requiring re-engineering, new drawings, panel modifications, re-wiring and re-testing.

The 8 Series Retrofit Kit provides a quick, 3-step solution to upgrade previously installed SR 469 relays. With the new 8 Series Retrofit Kit users are able to install the 869 Motor Protection System without modifying existing cutouts and wiring, and without any drawing changes or re-engineering time.

Buy 469 to 869 Retrofit Kit

Easy 3-Step Process to Upgrade in as Fast as 21 Minutes

Step 1 update settings file

EnerVista 8 Series Setup Software provides automated setting file conversion. Once completed, a graphical report is provided to verify and call out any specific settings that may need attention.

Step 2 replace relay

Simply remove the upper, lower and low voltage terminal blocks and then remove the SR chassis from the panel. No need to disconnect any of the field wiring.

Step 3 plug & play reconnection

Insert the new 8 Series Retrofit chassis into the switchgear and simply plug-in the old terminal blocks - there is no need to make any cut-out modifications or push and pull cables.