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Rayleigh Instruments RI-ELR00 Earth Leakage Relay with Integral Transformer


  • Single-phase or three-phase network compatible
  • DIN Rail or Surface mount enclosure
  • Integral 35mm transformer
  • Designed to monitor and detect true RMS earth leakage currents
  • Protected against nuisance tripping
  • Microprocessor controlled
  • Three versions available - 30mA, 100mA and 300mA
  • Separate ‘Test’ and ‘Reset’ push-buttons
  • SPDT relay output 5A
  • Green LED indicates presence of power supply
  • Trip & pre-trip visual warning
  • Type A leakage detection


The RI-ELR00 is an Earth Leakage relay with an integral transformer, preset trip level and fixed delay. The trip level may be preset to 30mA, 100mA or 300mA.

Designed to detect low-level leakage currents and to operate a contact if the leakage current exceeds the selected trip level. All phase conductors of the circuit being monitored are passed through the aperture of the ELR00 integral core balance transformer. The transformer output is connected to the internal circuitry which monitors the proportional leakage current and triggers the output relay accordingly.

Two LEDs on the front of the relay provide a visual indication of power status pre-trip and trip indication.

A SPDT relay contact is provided for alarm indication.

  • Pre-set trip level 30mA, 100mA or 300mA
  • Fixed time delay
  • Test facility:- Front panel push button
  • Reset facility:-
    1. Front panel push button
    2. By removal and re-applying the supply
    Note: The relay will remain in trip state until reset as above
  • Type A leakage detection to IEC/EN60947-2
  • Response time:-
    <30mS if leakage current ≥ 5 x I∆n
    <50mS if leakage current ≥ 1 x I∆n

Additional Information

Manufacturer Rayleigh Instruments
Product Name / Options Price (ex VAT)
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