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MS Resistances

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MS Resistances

Microelettrica Scientifica was founded in 1953 and continues to design, manufacture, test and sale high voltage and high power resistors for industrial applications. In few words:

MS Resistances has been present in all the major international projects over the past few years and will assist you in your realizations. M.S. Resistances is a subsidiary of the Microelettrica Scientifica Group, specialized in the designing, manufacturing and testing of High Power & High

Voltage Resistors. Resistors manufactured by M.S. Resistances are well known all over the world for their high technical performances and competitive prices. High quality level is achieved by following rules edited by ISO 9001 certifications.

Our objective is to set-up with you a long-term relation partnership based on competences, reactivity & state of the art service.

M.S. Resistances is responsible for the design & marketing of Power Resistors for industrial applications, in connection with the industrial division of Microelettrica Scientifica.


Designing, development, manufacturing, Testing & Service of:

PRODUCTS (Neutral Grounding Resistor)

The common solution is applied in MS's NGR products. It is used when the neutral of the supply transformer is available (DELTA/WYE) and its own impedance is not enough to limit the fault current.

Experience has shown that this is the most efficient and economical solution. The advantage of this solution becomes even greater if Ni-Cr steel resistors are used instead of cast iron or liquid resistors.


The existing standards specific for NGR are the IEE - 32 standard. For NGR made from stainless steelm, the allowed temparature rise for 10,30 or 60 sec 760 Celc, 610 Celc for extended time rating and 385 Celc for continous rating. Harmonics filters are built from L/C/R components, they are used to eliminate the harmonics which cause disturbances and energy losses, RESISTORS are used to damp the filter, it is an importance component. They must be able to dissipate the energy pulse when the filter is Switch ON or during overload.

Our Products

List of product in MS Resistances

  • Neutral Grounding Resistors

    Neutral Grounding Resistors

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    • Network Voltage ( Un ) : up to 150kV Fault Current ( In ) : up to 3000A
    • Rated Fault Duration ( second ) : up to continuous rating
    • IPCode:up to Ip56
    • Area Classification : up to hazardous area
    • Kind of Company : PowernPlant, Gas & Oil, Industry, Chemical, Cement, Mining etc.
  • Filter Damping Resistor

    Filter Damping Resistor

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    Harmonic Filters are used to absorb harmonic currents in order to limit the distortion transmitted to the network. Get more information on filter circuits here. Damping resistors can be included in the circuit to adjust the quality factor of the filter.

  • Load Banks

    Load Banks

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    Load Banks simulate an electric load.

    They are used in a variety of applications, including:

    • Factory Test of Diesel Generator Sets,
    • Reduction of Wet Stacking Problems,
    • Periodic exercising of Stand-by Generator Sets,
    • UPS and Batteries Test,
    • Load Optimization in Prime Power Applications,
    • Factory Tests of Turbines,
  • Motor Control

    Motor Control

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    When starting, an electrical motor has a huge current demand. Inserting a resistor in the circuit (on stator side for squirrel cage motors and on rotor side for ring type motors) will help reduce current appeal, control torque level and pilot starting phase duration.

  • Pre-insertion Resistors

    Pre-insertion Resistors

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    Pre-insertion Resistors are used to limit transients during circuit energization. They are characterized by a high resistance value and a high thermal mass which allows for a high amount of energy to be absorbed.

  • Marine Braking

    Marine Braking

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    When braking or stopping a vessel using electrical propulsion, the kinetic energy needs to be dissipated. The simplest way is to dissipate this energy into a resistor.

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