Sub-voltage supervision

Descripción del producto

Sub-voltage supervision withEUW 4
 
The EUW 4 was designed to supervise three-phase networks on undervoltage, in which the supervision isnt carried out only for the mean average value of the voltage but for every phase separately. By this asymmetry of the phases or even phase failures become recognized. In addition the neutral wire is supervised on wire breakage. Depending on design variant the switching threshold is either fixed or adjustable by a frontal potentiometer. If measuring voltages are above the switching point the output relay is pulled in with 2 change-over contacts and the operating light (green LED) shines. When one or several phase voltages sink below the switching point, the relay drops off and the operating light goes out. The permanent condition change is prevented by the inserted hysteresis, which varies measuring voltage around the switching point.