BU1 AC

Features:



AC Voltage Relay

Most suitable for Plain Under & Over Voltage protection.

Application :  most suitable for Feeder and Generators having system Voltage up to 11 KV

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Brands:C&S Electric

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Description

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

Protection Functions

  • Under Voltage Protection (27)
  • Over Voltage Protection (59)
  • 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%

Variant

 

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

Hardware

  • Static Design
  • Setting by potentiometer
  • Pair of potential free contact – 5A, 230V AC / DC
  • 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

Dimension

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