Low voltage grounding resistor

The LIMITER MC4 is a traditional grounding resistor: it limits the first fault to earth in B.T. systems. (≤ 10 A) using high ohmic value resistors. This eliminates arcing and allows continuous operation for industrial installations.

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Use of the limiter

Impedance use has been the most used way to ground neutral in low voltage systems in recent decades, as it provides better operational performance and a higher degree of safety.

In this scenario the LIMITER MC4, with its high value resistances, is ideal for landing the neutral of generators and transformers.

Parameters Available in the Display

  • Measurement and indication of neutral-earth voltage;
  • Measurement and indication of ground fault current;
  • Search for the location of the fault by means of a cyclic current actuated through a start-stop button;
  • Online supervision of the integrity of neutral-resistor-ground connections.

Operational Features

  • Local LED signalling of normal operation of the electrical system, i.e. without the presence of a fault to earth;
  • Local LED signalling when a fault occurs to earth;
  • Possibility of searching the place where the fault occurred;
  • Online monitoring of the integrity of the circuit section between neutral-resistors and ground limitation resistors, signaling the condition to normal or not (absence or not of this integrity).

Electrical Features

  • Phase-neutral voltage of the electrical system: 480/ 3V(*)
  • Insulation voltage class: 0.6kV
  • Limiting current: SA and pulse 4A for research (*)
  • Nominal frequency: 60Hz;
  • Aux. supply ranges available: 85-265 VAC or 100-230 VDC;
  • Auxiliary NAF contacts indicating remotely: Phase-earth
    missing;
    Absence of neutral resistor-ground circuit integrity;
    Absence of auxiliary supply voltage
  • Phase to ground current limiting resistors mounted on ceramic insulators.

(*) Other figures on request

Constructive Features

  • Housing made of 14USG sheet steel and 12USG structure (resistor compartment IP-21 and supervisory compartment IP-40)(*);
  • Fixation on vertical surface;
  • Wiring in the resistor compartment compatible with temperature rise during earth faults;
  • Light grey electrostatic paint, MUNSELL N6.5 (*);
  • Approximate approximate dimensions: 900x550x350 (HxWxD) mm;
  • Approximate weight: 50kG;
  • Device for placing the padlock in the supervisory compartment door (security NR-10)
  • Sheltered installation (*)

(*) Other figures on request

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