XI1-I Overcurrent and Short-Circuit Protection Relay

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Documentation (Brochures & Manuals)

As an universal time overcurrent protection, the XI1I relay of the PROFESSIONAL LINE is generally used in radial and meshed systems. Among other, it is applied as:

  • selective overload and short-circuit protection relay for electr. machines, lines and networks, or for
  • load dependent connection and disconnection of consumers and electric power generators.

It is possible to select from the following tripping characteristics:

  • Definite time overcurrent protection (DMT)

  • Inverse time overcurrent protection (IDMT) with selectable tripping characteristics

    • Normal Inverse

    • Very Inverse

    • Extremely Inverse

Furthermore, the XI1I can be employed as a backup protection for differential and distance protection relays.

Connection XI1I

Definite-Time Overcurrent Protection

Parameter Setting Range
I> 0.5 … 2 × I n (cont.)
I>> 1 … 15 × I n (cont.)
tI> 0 … 1 s / 0 …10 s / 0 …100 s (⌨) (cont.)
tI>> 0 … 2.5 s (cont.)

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

Inverse-Time Overcurrent Protection

Tripping characteristics according to IEC 255‑4 or BS 142

Parameter Setting Range
I> 0.5 … 2 × I n (cont.)
I>> 1 … 15 × I n (cont.)
tI> 0.1 … 2 s (cont.)
tI>> 0 … 2.5 s (cont.)

Auxiliary Voltage

Voltage supply via wide-range power supply unit:

Auxiliary voltage range

19 … 390 V DC or

36 … 275 V AC (f = 40 … 70 Hz)

Power consumption

approx. 4 W (terminals A1 and A2)

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.

  • Protection of High, Medium and Low Voltage feeders against thermal damages by overload or short circuit currents.

Inputs and Outputs
Current transformer inputs 3
Output relays 2
Protection ANSI
Time overcurrent protection 50/51
Mounting Type
Housing suitable for DIN rail mounting

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