Motor Protection

Multilin 469

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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 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 DeviceNet 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.