Intelligent Earth Fault Relay

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Products Code : iEFR

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  • True RMS measurement.
  • Common protection for earth fault and overload.
  • Clearance & creepage distance meet UL61010 safety standard.
  • Inverse curve-trip time is inversely proportional to fault current. This EFR is intelligent, when the leakage current is 10 times higher than the set current. It trips 10 times faster.
  • Field programmable trip current and trip time through front panel keys with password protection.
  • Continuous fault current display programmable to enhance the user to understand the quality of electrical network/machine online.
  • Continuous display of trip fault current programmable. In case of tripping, iEFR captures and displays the trip current with 4-digit resolution which helps the user to analyze and rectify the problem.
  • Continuous scrolling of display for set current and set time.
  • Wide I/P range: 30mA to 5A and trip time: 50ms to 30 sec. programmable.
  • Manual test and reset keys.
  • RS485 communication option.

Unique Features:

  • Microcontroller based design.
  • Password protection.
  • Current sensitivity wider range 30mA to 5A.
  • Programmable trip time 50ms to 30 sec.
  • Selection through soft keys.
  • Continuous earth fault value display.
  • Intelligent tripping based on T α 1/A or definite time.
  • Auto scrolling of trip info and peak fault current.
  • SMT reflow manufacturing process.



  • Higher technological advantage.
  • Helps in analysis and corrective action.
  • Security against mishandling.
  • No limitation on set current.
  • Wider choices to suit different industries.
  • Better IP protection and longer life.
  • Helps in online loss analysis.
  • Faster and reliable protection.
  • Better analysis.
  • Higher reliability.

Technical Specifications:


Class 2.0 FS, Time delay ±5% with minimum of 50ms

Input Voltage

80-300V AC/DC

Input Current

30mA to 5A programmable. Over current 30mA

Tripping Time

Programmable for fault current 30mA to 5A

setting Range

Low set current (I>): 0.05A to 5A

Low set time (kt>): 0.05, 0.1, 0.2, 0.3, 0.5, 1.0, 2.0, ….., 30 sec.

High set current (I>>): 0.1A to 30A or disable

High set delay time (t>>): 0.05 sec. to 30 sec.

Contact Rating

2 pairs of potential free NO & NC contacts. One part to EFR 200D

Mounting Type

Flush or DIN Rail


RS485 serial channel connection, industry standard MODBUS RTU protocol

Baud rate: 4800 to 19200bps (preferred 9600bps)

Isolation: 2000V AC isolation for 1 minute between communication and other circuits


  • Protect control panels and switch boards from flame fault.
  • Protects motors/transformers/feeders/generators etc. from earth fault.
  • Hazardous and sensitive industries like oil refineries, pulp industries, electrical distribution networks can be protected.

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