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Rishabh 253-EFR Earth Fault Relay

Rishabh 253-EFR Earth Fault Relay

Brand
Rishabh
Model number
253-EFR

Earth fault relay for CBCT, neutral or summation CTs with 1 A or 5 A secondary: trip setting 10 - 90%, delay 1 - 10 s or instantaneous, manual / remote reset, 230 V AC aux.

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Key features

  • Detection of earth leakage with CBCT / neutral / summation CTs (1 A or 5 A secondary)
  • Adjustable earth fault percentage (10 - 90%)
  • Adjustable time delay 1 - 10 s, or instantaneous (link selectable)
  • Testing simulation
  • Manual and remote reset
  • LED indication for trip and power ON
  • 2 pole relay contacts
  • Polycarbonate casing and clear terminal cover (UL 94 V-0)

Specifications

Input
Current sensorNeutral CT, CBCT or summation CT, secondary 1 A or 5 A
Setpoint
EF trip setting10% to 90% of rated current input (variable)
Set accuracy±5% of full-scale current input
Trip time delay1 - 10 s ±10% adjustable, or instantaneous (link selectable)
Auxiliary supply
Voltage230 V AC
Power consumption4.5 VA max.
Output relay
Contacts2 CO
RatingA.C. 5 A 240 V AC (resistive); D.C. 24 V 5 A resistive
ResetManual / remote
Life expectancy0.5 x 10⁶ operations at 100% rating
Indication
LEDsON (green) power ON, EF (red) trip
Standards
ApplicableBS 60255, IS 3231-1997; safety BS 5458, IEC 414
General
Operating temperature0 °C to 60 °C, humidity up to 95% RH
Storage temperature20 °C to 70 °C
Temperature co-efficient0.05% per °C
EnclosurePolycarbonate (UL 94 V-0), IP50 to BS 5490, IEC 259
DimensionsOverall 75 x 70 x 112 mm, mounting 35 x 55 mm
Weight400 g approx.

Specifications are from the manufacturer's published information. Confirm critical values with us or the datasheet before ordering.

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