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- voltage asymmetry between the phases
 - total loss of phase
 - symmetrical voltage drop in three phases
 - change the order of phases
 - exceeding of the phase upper voltage threshold >480 V
 - exceeding of the phase lower voltage threshold <320 v="" br=""> 
             

  
Functioning
 With the right voltage conditions the contacts of the sensor contacts are closed.  In the event of a voltage anomaly the sensor disconnects contacts with the appropriate time-delay. Return of the network parameters to standard conditions will reactivate the contacts with the preset delay. 
 Indications:
 Green LED [R]:
 - lights - correct parameters, contact closed
 - flashes - counting off the delay time of a next activation
 Red LED [<U]:
 - lights - voltage asymmetry or voltage below 320 V
 - flashes ×1/s - incorrect phase order
 - flashes ×3/s - voltage above 480 V
      
 
	   