Feeder protection



BU1 AC

BU1-AC- is static type self powered relay works directly from the measuring inputs.

Key Features

» Static Type Voltage Relay
» Self powered (Voltage Fail safe)
» Rated voltage Un : 110 V, 230 V, 400 V AC
» Time delay – 0-10 sec (step of 2 sec)
» Rated frequency range : 45-66 Hz
» Accuracy : ± 5 % of set value
» power consumption in voltage circuit : 3.5 VA
» Thermal load carrying : constant 1.3 x Un capacity of the voltage circuit
» Dropout to pickup ratio : dependent on the set hysteresis
» Dropout time : 300 ms
» Minimum operating delay : 300 ms





 Under Voltage Protection (27)


 Over Voltage Protection (59)

Under Voltage Protection BU1-AC– U
Over Voltage Protection BU1-AC – O
Under & Over Voltage Protection BU1-AC –UO

Options : 110V / 230V / 400V AC

Hardware


  Setting Range:
     » U< : 0.7 to 1.1 – Step 0.1
     » U> : 0.9-1.3 - Step 0.1
     » t : 0 - 10 S
     » DIFF : 2-10%
  Front plate of the unit is protected with a sealable transparent cover (IP40).

  Mounting - DIN

Standards


  Regulations: VDE 0435 part 303

  Shock : class 1 acc. to DIN IEC 255-21-2

  Vibration : class 1 acc. to DIN IEC 255-21-1



  • Two-Wire System

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  • Three-Wire System

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  • Four-Wire System

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