Product Details

  • Numerical Draw-out 1 Earth Fault

    Model No : PNA402-D

    The micro-controller continuously monitors the magnitude of the phase current and
    the neutral current .whenever the phase current or the earth current magnitude exceeds the
    present value corresponding line / earth element will pick up and relay will trip after time
    interval calculated by the selected IDMT curves. Whenever the fault level exceeds the
    selected high set range, the relay will trip for high set, ignoring the selected IDMT curves. The
    timer logic is processed and after comparison with set time schedules, tripping signals are
    issued accordingly. There are two output relays , each output relay has two change over
    contacts either for alarm or tripping. The output relays are programmable.
    The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which can
    be used with modbus protocol for communication purposes.


    • Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics
    • High-set non-directional Earth Fault Relay with instantaneous time or definite time function
    • Modular Integrated Draw Out System for field adaptability and tropicalised design (MIDOS)
    • Password protection
    • 2 line 16 characters industrial grade LCD with back-lit module for numerical display of setting values and measured values which is user friendly
    • Enabling /Disabling o f High-Set
    • RS-485 communication port with modbus protocol
    • Relay test facility with relay trip & without relay trip
    • Definite time curve for both Phase & Earth along with optional user defined curve.
    • Low AC burden
    • Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC
    • Unique combination o f 50/51/50N/51N in a single gadget
    • High Drop-off/Pick-up ratio