Prok Devices Private Limited
Prok Devices Private Limited
Rajaji Nagar, Bengaluru, Karnataka
GST No. 29AAACP7896A1Z5
Call 08048764939 81% Response Rate
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Digital Frequency Relay

Pioneers in the industry, we offer digital frequency relay from India.
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Digital Frequency Relay
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Digital Frequency Relay

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Well-known in the industry as a manufacturer, supplier, exporter and trader, we are engrossed in offering Digital Frequency Relay. Provide continuous display of the measured frequency, these relays are applied as backup protection for mechanical over speed devices in order to avoid damages. Finds its application in generator and captive power plant, our offered relays are also used for mechanical over speed devices.


  • Low maintenance
  • User selectable trip timings
  • High performance


  • Dedicated microcontroller based
  • Accurate, reliable and tropicalized design
  • Continuous display of the measured frequency
  • User selectable upper frequency and lower frequency limits
  • User selectable trip timings
  • Uses SMPS for Auxiliary Power i.e. Wide operating range for Auxiliary Input 85V-285V AC/DC


  • Rated Voltage: 230V/415V AC
  • Auxiliary Supply: 85V-275V AC/DC
  • Frequency Setting Range: 40-60 Hz. In steps of 0.1 Hz
  • Power Supply Burden: < 3Watts
  • Contact: Single change over contacts For Under frequency 8 Amps@250V AC, 8 Amps@30VDC Potential free contacts
  • Turn Off delay: 0.05-10.0 Sec In steps of 0.05sec Definite time, User selectable
  • Dimensions: 144X144X120 mm
  • Panel Cut Out: 137X137 mm



  • Generator and captive power plant
  • Over frequency relay applied as backup protection for mechanical over speed devices to avoid damages to prime mover
  • Under frequency relay applied to protect field winding from excessive current, voltage regulator from over load
  • Servo controller and inverters

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