Voltage sags and swells occur on the electric network while switching inductive loads such as shunt reactors, power transformers and high-power motors and during operation of arc furnaces which work with the principle of short circuit. Voltage protection relays detect voltage sags and swells as a failure and may disable the load in an uncontrolled manner. Voltage sags and swells may also cause stress on the load insulation on the electric network, loss of operating life and even serious damages.

In order to attenuate the transient voltage that occur during the commissioning of such loads of inductive character, the snubber capacitor which do not allow sudden changes in the voltage and the series-dependent damping resistance are used.

RC snubber filters are connected parallel to the network as close as possible to the load causing transient voltage. During the transient voltages occurring at high frequencies, the RC filters' impedance decreases to low value, prevent over-voltage of the mains voltage and damp the oscillation very soon.

Technical Specifications:

  • Suitable up to 36 kV
  • Stainless steel resistance material suitable for extreme ambient conditions, resistant to oxidation and corrosion, low resistance variation against to temperature and low inductance
  • Special mechanical and electrical design to withstand high temperature and inrush current
  • Design and tests in accordance with IEC 60071-1 and other special specifications

Resistor Element:

  • Spring-wound, edge-wound or grid resistor elements with low inductance and a cross-section suitable for the nominal current
  • Fully-modular, bended and stainless steel bolt connections in order to ensure electrical continuity at high temperature
  • High conductivity for high current with bended and cascaded terminal connectors suitable for serial and/or parallel connections with high cross-section, low contact resistance
  • High internal insulation and high mechanical resistance against to shocks and sagging thanks to the use of large surface satiated bushings and M16 shear connectors
  • Special designed to dissipate the thermal and mechanical effects of overcurrent to the surface grid resistors


  • Standard IP23 Protection Level suitable for outdoor usage and perfect cooling
  • Standard hot-dipped galvanized steel
  • Fully-modular, rigid, strong enclosure design with resistor blocks mounted to the frame for safety lifting from the upper or lower side
  • Easy access and maintenance to the resistor blocks on site thanks to blocks independently mounted to the frame
  • Door with hinges and lock
  • Corrosion-resistant handling rings and connectors
  • Stainless steel product and warning labels


  • Requested inductance limits
  • Stainless steel, aluminum enclosure
  • Painting enclosure in desired color code
  • Top or bottom entry or exit with bushings
  • Modular elevation legs suitable for extreme environmental conditions
  • Special design for high altitude
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