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Rishabh 253-PVB Single Phase Under & Over Voltage Relay, Adjustable Differential

Rishabh 253-PVB Single Phase Under & Over Voltage Relay, Adjustable Differential

Brand
Rishabh
Model number
253-PVB

Single Phase AC under & over voltage relay with adjustable differential (1 - 15%), 2 relays and 2 setpoints, setpoint 75 - 125% of nominal; factory-set time delay up to 30 s.

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Key features

  • Two relays with independent under and over voltage setpoints
  • Adjustable setpoint
  • Adjustable differential, 1 - 15%
  • Time delay preset at the factory (max. 30 s)
  • Energize / de-energize function swapping on request
  • LED trip indication
  • 2 pole relay contacts
  • Auto reset
  • DIN-rail or wall mounting
  • Applications: gensets (AVR and excitation), voltage-sensitive motors, UPS and standby supply change-over, mains failure units, computer supplies.

Specifications

Input
Nominal voltage100, 110, 220, 230, 240, 380, 400, 415 or 440 V (57 to 480 V)
System frequency50 / 60 / 400 Hz
Voltage burden0.3 VA approx.
Overload1.2 x continuously, 1.5 x rating for 10 s (BS 6253)
Setpoint
RangeUnder voltage 75 to 100%, over voltage 100 to 125% of nominal input voltage
Repeatability< 0.5% of full span
DifferentialAdjustable 1 - 15%
Time delayPreset (specify), max. 30 s, factory settable only
Auxiliary supply
Burden4 VA (max.)
Output relay
TypeD.P. changeover
RatingA.C. 240 V 5 A non-inductive; D.C. 24 V 5 A resistive
Operations0.2 million at the above loads
ResetAutomatic
General
Operating temperature0 °C to +60 °C
Storage temperature-20 °C to +70 °C
Temperature co-efficient0.05% per °C
Interference immunityElectrical stress surge withstand and non function to ANSI/IEEE C37 90a
EnclosureDIN-rail with wall mounting facility, flame retardant polycarbonate / ABS
Enclosure integrityIP 50
Dimensions75 mm wide x 70 mm high x 112 mm deep
WeightApprox. 0.6 kg

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

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