Motor Protection

239 Motor Protection Relay

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The 239 relay is designed to fully protect three phase AC motors against conditions which can cause damage. In addition to motor protection, the relay has features that can protect associated mechanical equipment, give an alarm before damage results from a process malfunction, diagnose problems after a fault and allow verification of correct relay operation during routine maintenance. It is also available with a Harsh Environment Conformal Coating option.

Features & Benefits
  • Save on installation cost - Compact design

  • Enhanced protection - incorporates thermal models

  • Setting flexibility - Multiple setpoint groups

  • Simplify testing - Built in simulation features

  • Asset Monitoring - Temperature monitoring via optional

  • RTD inputs

  • Access information - via Modbus RTU™

  • Follow technology evolution - Flash memory for product field upgrade

  • Complete protection of small to medium sized motors

  • Pumps, conveyors, compressors, fans, sawmills, mines

Protection & Control
  • Thermal Overload (15 selectable curves) - Trip and alarm, immediate current overload alarm

  • Phase short circuit

  • Mechanical jam

  • Thermal memory lockout

  • Single-Phasing / Current unbalance

  • Ground fault - trip and alarm

  • Overtemperature: via thermistor or optional RTD inputs

  • Undercurrent

  • Breaker Failure

  • Trip/alarm/auxiliary/service outputs

  • Multi-speed motor protection

  • Motor start supervision