Air Core Line & Load Reactors

Line and load reactors are generally serial-connected to the input and/or output terminals of three phase equipment such as motor speed controllers, inverters and UPS systems. These equipment make use of semiconductor switches such as IGBTs, thyristors, and diodes and therefore create harmonic distortion and high switching over-voltages (dv/dt). Use of such equipment has been becoming more widespread as the technology advances. However, the negative effects of these equipment should not be overlooked.

By use of line and load reactors the adverse effects of using such equipment are decreased:

  • Limited starting current
  • Reduced motor noise
  • Reduced motor temperature
  • Reduced harmonic distortion
  • Reduced motor heating
  • Reduced switching over-voltages
  • Easier selection of fuses as per nominal motor current

These reactors are designed in order to provide 4% voltage drop. Different voltage drop values are provided on demand.

All Hilkar line&load reactors are custom designed for different applications by considering the voltage, current, inductance, type of application, harmonics, interharmonics, size, transient events such as switchings, and loss characteristics that are required to provide the most efficient design at the most economical prices. All the routine tests are performed in accordance with IEC 60076-6 or other standards depending on customer request. Type test reports are available on request. All the test reports are submitted to customer. Basic testing program includes some or all of the following tests:

  • Routine Tests (Inductance, Resistance, One Minute AC Insulation Voltage Withstand Test and Impulse Voltage Withstand Test)
  • Short Circuit Withstand Test
  • Temperature Rise Test
  • Sound Level Test
  • Seismic Test






  • Designed and tested to applicable IEC and IEEE standards
  • High quality factor (Q)
  • High thermal capacity
  • High mechanical strength to withstand high short-circuit forces
  • Fiberglass resin spacers are used in order to provide ease of cooling
  • Compact design, dimensions can be adjusted according to customer's specific needs
  • Maintenance-free design
  • Side-by-side, delta or vertical arrangement
  • Insulation varnish & corrosion resistant paint
  • Aluminum, hot dip galvanized steel or concrete support stands on demand
  • Elevation stands on demand
  • Enclosures on demand


Technical Specification
Voltage Up to 36 kV
Type Air Core
Altitude Up to 1000m*
Installation Indoor / Outdoor
Insulation Class F (155°C)
Winding Material Aluminum or Copper
Insulation Material F class film or epoxy resin reinforced fiberglass
Temperature range -40°C to 55°C
Cooling Air Natural (AN)
Options Taps with DIN or NEMA terminal configuration

*Consult factory for higher values.