XRI1-E-R Directional Earth Overcurrent Protection Relay

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Documentation (Brochures & Manuals)

Smart view Documentation & Setup

The digital relay type XRI1E/X has been designed as a time overcurrent protection device for the use in electrical machines, lines and grids.

The protective functions of the XRI can be summarized as follows:

  • Definite-time overcurrent;
  • inverse-time overcurrent with selectable characteristics;
  • two-element earth fault protection with definite or in-verse time characteristics.

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 XRI1E/X can be employed as a backup protection for differential and distance protection relays.

Connection XRI1E/X

Overcurrent Protection

Parameter Setting Range
I> 0.2 … 4.0 × I n
I>> 1 … 40 × I n

0.03 … 260 s (definite time)

0.05 … 10 s (inverse time)


0.03 … 2 s

Earth Fault Protection

Parameter Setting Range
IE> 0.01 … 2.0 × I n
IE>> 0.01 … 15 × I n

0.03 … 260 s (definite time)

0.05 … 10 s (inverse time)


0.03 … 2 s

Auxiliary Voltage

Voltage supply via wide-range power supply unit:

Auxiliary voltage range

16 … 360 V DC or

16 … 270 V AC

Power consumption

standby: approx. 3 W

operating: approx. 5 W (terminals C9, E9)

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.

  • Directional earth fault protection of High, Medium and Low Voltage feeders.

Inputs and Outputs
Binary inputs 2
Current transformer inputs 1
Output relays 4
Voltage transformer inputs 3
Watchdog relay 1
Protection ANSI
Earth fault protection 50N/51N (Option)
Sensitive EF isolated/compensated 50Ns/51Ns (Option)
Earth fault directional feature 67N
Additional Features
Fault recorder (none volatile)
Parameter sets 1
Modbus RTU (Option)
RS485 Open Data Protocol (Option)
Mounting Type
Housing suitable for DIN rail mounting

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