XI1-S Earth Overcurrent Relay for Solidly or Resistance Grounded Grids

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The XI1S of the PROFFESIONAL LINE is an all-purpose protection against earth faults, used for electrical machines, lines and networks with solidly or sesistance-grounded neutral; it is mainly used in radial networks. Very often the XI1S can be found as backup protection at the central earthing point of the system. It detects all earth faults occuring in the system.

Relay variant XI1S-R with directional current sensing is a selective earth-fault protection and is normally used in ring systems, networks with parallel feeders and in complex meshed systems.

Anschlussbild XI1S
Connections XI1S in holmgreen circuit

Anschlussbild XI1SR
Connections XI1SR in holmgreen circuit

Definite-Time Earth Current Protection

Parameter Setting Range
IE> 0.25 … 1.75 × I n (cont.)
IE>> 1 … 15 × I n (cont.)
tIE> 0 … 1 s / 0 …10 s / 0 …100 s (⌨) (cont.)
tIE>> 0 … 1.25 s (cont.)

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

Inverse-Time Earth Current Protection

Selectable tripping characteristics:

  • Normal Inverse

  • Very Inverse

  • Extremely Inverse

Parameter Setting Range
IE> 0.25 … 1.75 × I n (cont.)
IE>> 1 … 15 × I n (cont.)
tIE> 0.1 … 2 s (cont.)
tIE>> 0 … 1.25 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.

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

Inputs and Outputs
Current transformer inputs 1
Output relays 2
Protection ANSI
Resistance earthed / solidly earthed 50N/51N
Mounting Type
Housing suitable for DIN rail mounting

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