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C440 Overload Relay Test Procedure

  • Single phase AC supply wired through all 3 poles in series, or three phase AC supply
  • Power must be removed when relay trips to avoid damage
  • Time begins once the LED starts blinking.  If a C440-XCOM module is installed and powered then the LED will begin blinking instantaneously once current is injected.
  • The trip should occur between the cold and hot trip curves with a trip time tolerance of +/- 20%