DOCA0160EN-00

Pre-alarm Detection

The pre-alarm threshold >I1 corresponds to an earth-leakage level that must be eliminated before it becomes hazardous for the installation.

A pre-alarm is active when the measured earth-leakage current is greater than the set pre-alarm threshold >I1 for a period of time greater than the set pre-alarm time delay ton1 (in milliseconds or seconds).

When a pre-alarm is active:

  • K1 relay is activated

  • PRE-AL LED is switched on

  • the value of earth-leakage current blinks on the LCD display

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