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A variable speed drive reactor is basically an inductor installed on the input or output of the variable speed drive.

Line reactors stabilize the current waveform on the input side of a variable speed drive, reducing harmonic distortion & the burden on upstream electrical equipment. Harmonics are high-frequency voltage & current distortions within the power system normally caused by nonlinear loads that don't have a constant current draw, but rather draw current in pulses. Variable speed drives create harmonics when they convert AC to DC & DC back to AC.

By absorbing line spikes & filling some voltage sags, line & load reactors can prevent overvoltage & undervoltage tripping problems. Load reactors, connected between the variable speed drive & motor, will dampen overshoot peak voltage & reduce motor heating & audible noise. A load reactor helps to extend the life of the motor & increase the distance that the motor can be from the variable speed drive.