XUF2 Voltage and Frequency Relay

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  • XUF2 (DIP setting for 50 Hz / 60 Hz and for Vn = 100 V / 110 V / 230 V / 400 V) – ANSI 27, 59, 81O, 81U

The relay XUF2 of the easy PROFESSIONAL LINE is a digital relay for voltage and frequency supervision of 1-phase or 3-phase systems and provides protection for electrical power generators and general equipment against in-admissible undervoltage or overvoltage as well as against frequency changes.

In addition it is possible to supervise the phase sequence.

2 Wire System Connection XUF2
Connecting two-wire system, DIP-switch setting Y

3 Wire System Connection XUF2
Connecting three-wire system, DIP-switch setting Δ

4 Wire System Connection XUF2
Connecting four-wire system, DIP-switch setting Y or Δ

Voltage Protection

Parameter Setting Range
V< 75 … 100 × V n (cont.)
V> 100 … 125 × V n (cont.)
tV<, tV> 0 … 1 s / 0 …10 s (⌨) (cont.)
Hysteresis for V<, V> 3%

(⌨) Different setting ranges via DIP switches. ( Smart view covers the whole range.)

Frequency Protection

Parameter Setting Range
f< 95 … 100 × f n (cont.)
f> 100 … 105 × f n (cont.)
tf<, tf> 0 … 1 s / 0 …10 s (⌨) (cont.)
Hysteresis for f<, f> 0.25%, 0.5%

(⌨) Different setting ranges via DIP switches. ( Smart view covers the whole range.)

Auxiliary Voltage

Voltage supply via wide-range power supply unit:

Auxiliary voltage range

50 … 750 V DC or

36 … 520 V AC (f = 35 … 78 Hz)

Power consumption

approx. 4 W (terminals A1 and A3)

Benefits of the Professional Line

  • Fast DIN rail mounting    easy and fast mounting
  • Sealable plastic covers    safe (see if anybody has broken the seal)
  • Super easy settings via front buttons    fast without computer
  • LED and output relays fault indication    easy to find out what has happened
  • Compact form factor    fits in small spaces
  • IT security    no way to attack via Ethernet
  • Robust and reliable    well proven reliable quality
  • Wide Range Power Supply    don’t worry about available supply voltage
  • Integrated Self-Test Procedure (via button)    fast and easy checks: relays, LEDs
  • For all relays except XD1-G and except XRI...: optional interface adapter XRS1 (order code XRS1A or XRS1*);

    for all XRI... [except XD1-G]: optional adapter RS485 to USB (order code RSC2485USB1):

      easy doing high precision settings via Windows ® PC software »Smart view«


  • Interconnection of renewable energies (DER – distributed energy resources) to the public grid.

  • Over- / Undervoltage protection.

  • Protection of High, Medium and Low Voltage feeders against overvoltage (insulation damage) and undervoltage.

  • Frequency based protection: Over-/Underfrequency supervision

Inputs and Outputs
Output relays 2
Voltage transformer inputs 3
Protection ANSI
Voltage protection 27/59
Frequency protection 810/81U
Mounting Type
Housing suitable for DIN rail mounting

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