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LT Harmonic Block Reactors from


Neptune filter circuit are designed as three-phase reactors with an iron core and air gap.Harmonic Filter Reactors are made out of highest quality material and very stringent quality control. It has been designed with properties like low temperature rise and lower flux density so that it can operate in worst conditions of ambient and harmonic overloads. They offer very good degree of linearity. Cheaper and non-linear reactors may trigger undesirable chain phenomena during periods of operation with high harmonic values, such as reducing in the inductance with consequent increase in the resonance frequency of the LC group, which would drain off more harmonic current, further reducing its inductance and overload the reactor more and more. Reactors are available with filteringfactor of 7% and 14% in 12.5, 25, 50 and 100 KVAR rating. Any other filtering factor and rating can be made on request.


Standard Voltage (Un) 440V to 690V
Rated Voltage 3 x 415V
Rated Frequency 50/60 Hz
Rated Power 5,10,12.5,15,20,25,50 and 100 KVAr
Constructional Max. Voltage 1000 V
TestVoltage 3000 V
Filtering factors /Tuning Freq.
  • 5.67%, 210Hz
  • 7%, 189 Hz
  • 14%, 134 Hz
Tolerance of inductance ±3%
Linearity (L> 0.95 x Ln) 200%
Ambient temperature +55 deg C
Insulation Class H
Cooling method Natural cooling (AN)
Installation Indoor
Protection degree IP00
Operating altitude 1000m above sea level at rated operation
Temp. sensor (normally closed) 155 deg C
Reference standard IEC 61558-2-20

Download Product Catalogs:
  • Neptune-DUCATI De-tuned Reactor Catalouge