Approximate Quantitative Advantages of Automatic Voltage Controller at various fluctuation levels:

Input Voltage Variation	% Reduction In Breakdown Possible		Approx. Power Saving Possible
	Motor load below 10 Hp	Lighting load	Motor load below 10 Hp	Lighting load
380 - 400 volts	Nil	Nil	Nil	Nil
380 - 420 volts	5%	10%	3%	5%
380 - 440 volts	10%	20%	5%	10%
380 - 460 volts	40%	40%	7%	20%
380 - 480 volts	60%	60%	10	30%

There is a wide range and models of Servo Stabilizers. The standard three phase models are suitable for balanced and unbalanced supply and loads.

The standard models confirm to the following technical specifications:

Voltage	Current	Watts	Luminous Intensity	Life In Hours
380 - 400 volts	Nil	Nil	Nil	Nil
380 - 420 volts	5%	10%	3%	5%
380 - 440 volts	10%	20%	5%	10%
380 - 460 volts	40%	40%	7%	20%
380 - 480 volts	60%	60%	10	30%