Air Core Line and 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 types of 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 should not be overlooked.

By using line and load reactors, the adverse effects that comes with using such equipment can be decreased in the following ways:

  • 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 and load reactors are custom designed for various and diverse. The designs take into consideration the voltage, current, inductance, type of application, harmonics, interharmonics, size, transient events such as switchings, and loss characteristics in order to provide the most efficient design at the most economical price. All routine tests are performed in accordance with IEC 60076-6 or other standards, depending on customer request. Type test reports are available on request and all reports are submitted to customer. Basic testing programs 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.